Table of Contents
BUILDING SPECIFICATION ····························································· 4
1.1
Design and Construction Criteria ························································ 4
1.2
Principal Particulars ······································································· 4
1.3
Classification Society ····································································· 5
1.4
Tank Capacities ············································································ 5
1.5
Definitions ·················································································· 5
1.6
Hull Construction ·········································································· 5
1.6.1
Operating Conditions ····························································· 5
1.6.2
Lofting of Hull Lines and Offsets ··············································· 5
1.6.3
Deadweight ········································································ 6
1.6.4
Construction Standards ··························································· 6
1.6.5
Construction details ······························································· 6
1.7
Spare Parts and Vendor Documentation ················································ 7
2.0
CERTIFICATION & TESTING ····························································· 8
2.1
Certificates·················································································· 8
2.2
Tonnage Measurement ···································································· 8
2.3
Inspection, Measurements, Tests and Trials ············································ 8
2.4
Testing for Hull Structure······························································· 10
2.5
Commissioning Trials ··································································· 10
2.5.1
Stability book ···································································· 11
2.6
Tank capacity plan and tables ·························································· 11
2.7
Electrical System Tests and Trials ····················································· 12
2.7.1
General ··········································································· 12
2.7.2
Generators ········································································ 12
3.0
CORROSION PROTECTION ····························································· 13
3.1
Paint System ·············································································· 13
3.1.1
Paint Supplier ···································································· 13
3.1.2
Documentation··································································· 13
3.1.3
General ··········································································· 14
3.1.4
Solvent Cleaning ································································ 14
3.1.5
Mechanical Cleaning···························································· 14
3.2
Painting ··················································································· 15
3.2.1
General ··········································································· 15
3.2.2
Points of Particular Attention: ················································· 15
3.2.3
Shop Primed Steel ······························································· 16
3.2.4
Drying Time and Immersion ··················································· 16
3.2.5
Paint Touch-up – Structure and Equipment ·································· 16
3.3
Hull Markings, Operating Instructions and Equipment Tagging··················· 16
3.3.1
Hull markings ···································································· 16
3.3.2
Equipment tagging ······························································ 17
3.4
Other Means of Corrosion Protection ················································· 18
1.0
3.4.1
Cathodic protection ····························································· 18
4.0
EQUIPMENT SPECIFICATIONS ························································· 19
4.1
General ···················································································· 19
4.1.1
Pump Room Operating Procedures ··········································· 19
4.1.2
Notices and Instructions ························································ 19
4.1.3
Lifting Points ···································································· 19
4.1.4
Fire Fighting ····································································· 19
4.1.5
Machinery Space Ventilation ················································· 20
4.1.6
Equipment Foundations ························································ 20
4.1.7
Access Ladders, Steps ························································· 20
4.1.8
Access Stairs ····································································· 21
4.1.9
Doors·············································································· 21
4.2
Pump Room Equipment ································································· 21
4.2.1
Ballast Pumps ···································································· 21
Oily Bilge System ···································································· 21
4.2.2
Oily Water Tank and Sludge Tank ············································ 22
4.2.3
Sludge Discharge Pump ························································ 22
4.2.4
Oily Water Separator ··························································· 22
4.2.5
Sea Chest ········································································· 22
4.2.6
Generator Set ···································································· 22
4.2.7
Diesel Engine Exhaust System ················································ 23
4.2.8
Diesel Engine Fuel Oil System ················································ 23
4.2.9
Instrumentation for Diesel Engines ··········································· 24
4.2.10 Cooling Water Tank ···························································· 25
4.2.11 Cooling Water Expansion Tank ··············································· 25
4.2.12 Control Room ···································································· 25
5.0
PIPING SYSTEMS ·········································································· 26
5.1
General Design ··········································································· 26
5.2
Piping ····················································································· 26
5.2.1
General ··········································································· 26
5.2.2
Pipe Jointing and Connections ················································· 26
5.2.3
Flanges and Bolts································································ 27
5.2.4
Fitting of Gaskets and Seals···················································· 27
5.2.5
Fitting of Thermal insulation ·················································· 27
5.2.6
Manometer / Vacuum Meter ··················································· 28
5.3
Pipe Colour Coding······································································ 28
5.4
Tank Venting System ··································································· 28
5.5
Tank Ballast System ····································································· 28
5.6
Valve Operation·········································································· 29
6.0 BARGE OUTFITTING ····································································· 30
6.1 Towing Equipment ····································································· 30
6.1.1 Towing Brackets ······························································· 30
6.1.2 Towing Bridle ··································································· 30
6.1.3 Bridle Retrieval Winch ························································ 30
6.2 Mooring Equipment···································································· 31
6.2.1 Mooring Fittings ································································ 31
6.2.2 Mooring Lines ·································································· 31
6.3 Anchor Handling Equipmen ························································· 31
6.3.1 Anchor and Anchor Chain ··················································· 31
6.3.2 Anchor Housing ································································ 31
6.4 Internal Access ········································································· 32
6.5 Means of Access ······································································· 32
6.5.1 Stair Shed, Manholes, Hatches, Emergency escape, Covers etc. 32
6.5.2 Bottom Plugs ··································································· 32
6.5.3 Pilot Boarding Ladders ······················································· 33
6.6 Safety Plan, Signals and Life-saving Appliances ···························· 33
6.6.1 Safety plan ······································································ 33
6.6.2 Life-saving appliances ······················································· 33
7.0
ELECTRICAL EQUIPMENT ······························································ 34
7.1
Introduction··············································································· 34
7.2
Electrical Supply ········································································· 35
7.3
Generating System ······································································· 35
7.4
Electric Motors ··········································································· 36
7.5
Lighting Transformers ·································································· 36
7.6
Electrical Plug Sockets ·································································· 36
7.7
Switchboard ·············································································· 36
7.7.1
For the Alternator ······························································· 37
7.7.2
For the Shore Supplies ·························································· 37
7.7.3
For the 440 V Distribution ····················································· 37
7.7.4
For 230 V System ······························································· 37
7.7.5
For 24 V Systems ······························································· 37
7.8
Starters ···················································································· 37
7.9
Lighting ··················································································· 38
1.0 BUILDING SPECIFICATION
1.1 Design and Construction Criteria
The Barge shall be constructed as a steel deck barge for unrestricted ocean service. The hull
shall be arranged with a shaped bow, anchor pocket, raked stern with skegs. The hull shall be
suitable for load-out over-the-stern and over-the-bow and transportation of deck cargo with a
maximum weight 8,000 metric tons. Longitudinal and transverse bulkheads are internally
arranged to sub-divide the hull into compartments for seawater ballast, a fresh-water cooling
water tank and a machinery space at the bow under the Main Deck. Reference is made to fig.
1.1
The barge is specified according to:
 Unmanned non-self propelled steel deck barge
 BV Rules for the Classification of Ships
 Class notation:  1A1 Ballastible Barge,
 Registration Authority :Hongkong
 International Load line Convention, 1966
 Life saving-, Fire fighting and Navigation equipment
 Conditions associated with the load-out and transport of an 8,000 metric tons topside with
centre of gravity 27.5 m above barge keel.
 International Convention on Tonnage Measurement of Ships, 1969
 Suez Canal Tonnage certification.
All valid documentation & registration, equipment certificates to the latest standard and
revision, to operate barge to world wide service.
BUILDER will provide a bill of sale and a builder certificate upon delivery of the barge.
1.2 Principal Particulars
Designer shall make a final Freeboard Calculation for the Barge in respect of the
requirements of the Certifying Authority for CLIENT’S approval.
Barge name
Length overall, moulded
Breadth, moulded
Depth, moulded
Scantling draught
Summer draught
Light ship weight
:
: 122.00 m
: 36.60 m
: 7.60 m
: 7.00 m
: 5.803 m
: Approx. 4000 metric tons
Frame spacing
: 2500 mm
Note 1: When deck plate thickness varies, the top of the (weather) deck shall to be completely
flush. Hence moulded depth may vary with the plate thickness.
1.3 Classification Society
CLIENT has nominated BV for the approval of the design and construction of the barge.
1.4 Tank Capacities
In summary the total tank capacities are estimated as follows but BUILDER shall determine
the final capacities.
Water ballast
:
22564 m3
Fuel oil tank
:
9.6 m3
Cooling water tank
:
86.9 m3
1.5 Definitions
Definitions are given in the Articles of the Contract.
1.6


Hull Construction
The Barge shall be constructed using grade A, B, D and E shipbuilding quality steel,
pending plate thickness and location. High strength steel shall be used as required, subject
to CLIENT’S approval. All steel used for the hull construction shall have a yield stress of
at least 235 N/mm2.
Asbestos shall not be used in any part of the Barge construction.
1.6.1
Operating Conditions
The Barge must be suitable to operate in climates with:
 External air temperature range -20°C to + 55° C
 Sea-water temperature range 0°C to +32°C
 All equipment shall meet specific requirements for humidity, oily and salt laden marine
atmosphere. Equipment and systems shall operate satisfactory under marine operating
conditions including movements, accelerations and vibrations due to barge motions.
1.6.2
Lofting of Hull Lines and Offsets
The hull lines shall be laid down in accordance with BUILDER’s standard practice and faired
to the satisfaction of the CLIENT prior to commencement of construction.
1.6.3
Deadweight
Using the preliminary material take-off from the design of the Barge the deadweight has been
determined on the following basis:




Summer draft
Displacement
Lightship
Deadweight
5.803 m
24162 metric tons
4000 metric tons
20162 metric tons
Designer shall make best endeavours to minimize the lightweight of the Barge in order to
provide a maximum deadweight.
1.6.4
Construction Standards

The IACS “Recommendation No 47 - Shipbuilding and Repair Quality Standard” latest
version shall be adopted for the dimensional control and acceptance for the manufacture,
setting-out and installation of structural components.
 Special consideration shall be given to providing continuity to structural members.
 All matters relating to welding and NDE inspection, testing and acceptance shall be in
compliance with the requirements set out in the following documents :
 Rules of the Classification Society.
 Applicable standards
 Temporary attachments to the permanent fabric of the Barge shall be permitted to assist
BUILDER’s work but upon completion of the work shall be removed flush to the original
surface of the permanent fabric which shall be made good to an “as-new” condition and
coated to suit.
1.6.5
Construction details






All plate stiffeners shall be made from material formed as bulb profile section(s) of size
and type detailed in the drawings or, when not detailed, by BUILDER’s calculation –
stiffeners made from material as angle sections shall not be permitted unless noted
otherwise on the drawings.
BUILDER shall comply with the definition of scantlings, section size and type as detailed
in the SPECIFICATIONS. Under Article 6 it is not acceptable to CLIENT to make a
substitution by larger size simply due to non-availability of specified material unless prior
written approval is given by CLIENT (one week notice)
Openings in bottom-mounted web frames shall be arranged assuming a fifty (50) mm
layer of mud on the tank bottom.
Additional local framing shall be fitted in way of openings, doors and manholes that
cause discontinuities in plate stiffeners or at locations where there is a need to prevent
excessive deflection of plating.
Steel backing strips shall not normally be allowed. Utilisation of backing strips consisting
of other material is subject to CLIENT approval.
All openings in the structure shall be neatly and carefully made with a finished cut that is
regular in outline with burns removed and edges are rounded and smooth. Discontinuities,


which may impair the design strength of structural members, shall have suitable framing
arrangement(s) to compensate and shall be subject to CLIENT approval. Structural shapes
shall not terminate on soft plating without proper stiffening treatment to prevent
punching. Under no circumstances shall square-corner openings be made in any primary
structural member. Openings in the hull bottom, side-shell, ends and decks shall be
compensated for “lost area” by the use of insert plates.
Piping penetration shall be 100 % welded at both sides of plating. Galvanized piping shall
be welded in such a way that galvanizing surface is not damaged.
Sole plate(s) shall be fitted under all stanchions and be continuously welded. Pieces of
round bar or railing to be installed over or around holes in stringers and decks in tanks all
as per CLIENT’s requirements.
1.7 Spare Parts and Vendor Documentation
BUILDER shall supply the complete inventory of general tools, special tools, spare parts for
all items mentioned in Section 8.0 herein under its scope of supply. For equipment supplied as
CLIENT Provided Items the aforesaid items shall be the responsibility of CLIENT.
Documentation indicating that the equipment has been satisfactorily demonstrated to all
concerning parties to achieve the specified performance at the manufacturer’s premises prior
to shipment.
2.0 CERTIFICATION & TESTING
2.1
Certificates
The following certificates shall be obtained by the BUILDER and issued to CLIENT upon
delivery of the Barge:
 Class Certificate
 Custom Export Clearance
 Load line Certificate
 International Tonnage Certificate
 Suez Canal Tonnage Certificate
 BUILDER's Certificate
 Certificates for equipment
All required vessel documentation, and certificates which are required for international
worldwide service of a Cargo Barge are to be provided by BUILDER.
2.2
Tonnage Measurement
BUILDER shall measure the Barge for the issue of tonnage certificates in compliance with
the regulations of Flag Authority and shall groove in on the Main Deck beam a permanent
mark noting the registered tonnage and official number of the Barge. Registration shall be
dealt with by the CLIENT but BUILDER shall render all necessary assistance to CLIENT in
order to execute associated activities.
2.3
Inspection, Measurements, Tests and Trials
The Work shall be tested fully and commissioned by the BUILDER and witnessed by
CLIENT and Classification Society so as to demonstrate to the satisfaction of CLIENT and
Classification Society the adequacy of BUILDER's workmanship and materials, and the
suitability of the Barge to operate properly for the functions intended and to insure full
compliance with the Specifications.
A neatly compiled record shall be kept showing all pertinent test data for each individual
piece of equipment or system so that a comparison can be made with the rated output,
capacities and functional characteristics or limitations in the various equipment data sheets. In
this way BUILDER shall verify to the satisfaction of CLIENT that each piece of equipment or
system is performing in accordance with the required standard.

When an Important Check Item is approved by Classification Society and CLIENT
representative, signatures shall be made by the Classification Society and CLIENT
representative in the Inspection Approval and other related inspection reports.

If the Classification Society and CLIENT are not satisfied with the inspection or test
result, the CLIENT shall make a description of the non-conformance and clearly instruct
whether a re-inspection is needed. When the above mentioned problems occur BUILDER
is responsible to follow the requirement(s) of CLIENT and Classification Society to
remedy the non-conformance and advise CLIENT of the corrective action and re-testing
plan.

BUILDER and CLIENT shall jointly prepare and agree a “List of Important Check
Items”.
The following codes indicate the scope and nature of quality control and testing required:







A.W.S. D1.1 for welding procedures and welders qualification or equivalent.
Rules and Regulations for ships as per Classification Society.
"Rules for the manufacture, testing and certification of materials".
S.N.A.M.E. "Code on Installation and Ship Tests".
International Standard ISO 8501-1 for painting preparation.
Test Requirements for the type approval of control and electrical equipment.
I.E.C. International Electrotechnical Commission.
When the Barge is substantially complete and all equipment tested, the tests as listed below,
shall be executed under the presence of the Classification Society and the CLIENT
representative(s):





Inclining Test.
Operation of anchor winch and bridle retrieving winch.
Operation of generator under full load.
Operation of ballast & bilge arrangement for sustained period.
Tests as mentioned in the Specifications.
2.4
Testing for Hull Structure


2.5
The tests shall be executed and completed to the satisfaction of the Classification Society
and CLIENT.
Hydrostatic (leak) tests for the hull structure shall be conducted as required by the
Classification Society.
Commissioning Trials
Tests shall be carried out according to the requirements of the Classification Society and are
to be witnessed and approved by CLIENT. Mooring trials concern the initial running up and
performance testing of the active system. The BUILDER shall complete the documentation of
dock trials prior to commencing delivery. For these tests the BUILDER shall supply all fuel
and oil required. The BUILDER shall supply all necessary instruments as required to assess
the performance of all equipment.
Any defects found during trials must be corrected and re-tested until proven to CLIENT’s
satisfaction. Commissioning trials shall consist of, but not be limited to, the following:
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Engines together with all their auxiliary equipment and operating systems.
Electrical, control and automation system throughout the Barge, including megger tests
on all circuits, generators and motors.
All systems – ballast, bilge, fuel oil, and others as installed.
Ventilation systems - tested, balanced and fully demonstrated.
Operation of all interlock and alarm functions.
2.5.1
Stability book
Designer shall prepare a Stability Book based upon the Inclining Test for approval by the
regulatory bodies. The document shall be prepared in accordance with the regulatory body
and shall include: index, general particulars, plan showing holds, store rooms and tanks,
system(s) of units with conversion factor(s), hydrostatic particulars, tank capacities and cog’s,
cross curves of stability, dead-weight scale, typical loading conditions with GZ curves,
flooded condition stability conditions, inclining report and CG location.
2.6
Tank capacity plan and tables
Tank Capacity Plan and Tables for all tanks onboard the Barge shall be prepared by the
Designer and subject to CLIENT approval. Capacities shall be given as internal volume,
deduction for structure, SG and weight of fluid, tank cog, sounding and ullage scales and free
surface corrections. Also, the Tank Correction Table shall be prepared for a range of heel and
trim angles.
2.7
2.7.1
Electrical System Tests and Trials
General
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2.7.2
Before final connection of cables to equipment the circuits shall be megger tested for
checks to insulation resistance, short circuits and grounds. In addition, circuit continuity
shall be checked.
Motors shall be megger tested before connections are made.
Motor bearings, shaft alignment, rotation, phase and current shall be checked.
Motor running condition for smoothness and balance, natural frequency induced
foundation, temperature, noise, leakage of fluids, tightness of connection of fittings.
Starter overload relays shall be checked for correct ratings.
A check shall be made that all electrical equipment is effectively grounded.
Insulation resistance of all circuits and equipment shall not be less than specified by the
rules and regulations.
The systems shall be proven to CLIENT satisfaction by means of suitable trials and any
defects shall be corrected before delivery of the Barge.
Generators
The generator shall be tested on board as follows:
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Check all interlocks on electrical switchboard.
Check automatic control of voltage over complete generator load range.
Start and stop largest motor with no load on the generator.
Running condition for all electric motors. Such as, but not limited to the bilge pump.
Check operation of all instruments on the switchboard.
Over voltage test.
Under current test
Reverse power test.
3.0 CORROSION PROTECTION
3.1
Paint System
3.1.1
Paint Supplier
CLIENT prefers Jotun Coatings as their paint supplier. Alternative paint suppliers are subject
to CLIENT approval. BUILDER shall be responsible for the paint supply and application as
well as the inspection and testing of completed coatings. BUILDER shall arrange:
 Paint-supplier-provided paint inspector;
3.1.2
Documentation
All coating materials and application procedures shall conform to the paint supplier’s data
sheets and BUILDER shall be familiar with all relevant information such that BUILDER’s
equipment and resources shall be capable of applying the recommend coating system. The
following documentation shall be submitted by BUILDER with all records countersigned by
paint supplier’s representative for CLIENT’s approval:
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Paint Plan
Painting Application and Test Procedures
Painting Report
3.1.3
General
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3.1.4
Solvent Cleaning

3.1.5
All surfaces to be coated shall be cleaned prior to the application of any paint, cleaning
shall remove all mill scale, rust, old paint, grease, oil, markings, etc. Methods to be used
are fresh water washing, solvent cleaning, blasting and mechanical cleaning.
BUILDER shall be responsible for the removal of consumables used for cleaning to
ensure that all areas are thoroughly cleaned.
Prior to actual abrasive cleaning or fresh water washing any remaining oil, grease or other
fatty matter shall be removed by means of an appropriate solvent in accordance with
SSPC-SP 1 and the surface shall be completely dried.
Mechanical Cleaning
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Power tools may be used to obtain the required surface preparation where blasting is not
possible. These surfaces shall be 100% power disc cleaned but only after prior acceptance
by CLIENT.
Care should be taken not to polish the metal surface so as not to reduce the adherence of
the coating.
The use of steel wire brushes shall be restricted to cleaning of welds.
3.2
Painting
3.2.1
General
The coating system(s) applied to the external surfaces and compartment interiors of the Barge
shall be of a high standard suited to a minimum continuous service period for the Barge of 2
(two) years without dry-docking.
3.2.2
Points of Particular Attention:
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Stripe coats shall be applied by means of brush before each spray coat over weld seams,
rounded plate edges, where applicable.
BUILDER shall ensure that the coating system(s) is fully compatible with any existing
system when a repair is to be made to that existing coating.
Spraying equipment to be used shall meet the recommendations and instructions set forth
by the paint manufacturer, for each specific system. The specified thickness shall be
according to normal shipbuilding practice (2 types 85% standard).
All paint used for hull markings shall be compatible with underlying coating system and
grease crayons, filler or flushing cements shall not to be used.
If sections are painted prior to erection, all damage to the paint must be made good prior
to acceptance. The manufacturer recommendations for over-coating intervals and surface
preparation requirements for over-coating and the possible need for tie-coat shall be
adhered to.
Damage to, or breakdown of the shop primer or the coating system during the building
process shall be made good strictly in accordance with the paint manufacturer's
recommendations.
Each coating shall be visually differentiated by colour and the interval between coats
specified by the paint manufacturer shall be strictly maintained.
3.2.3
Shop Primed Steel
All plates, sections and pipes shall be supplied coated with shop primer. Shop primer shall be
a low zinc-silicate weldable type and compatible with recommended paint-system.
3.2.4
Drying Time and Immersion
Paint manufacturer's recommendations shall be strictly adhered to with regard to minimum
and maximum drying times and for maximum time prior to immersion.
3.2.5
Paint Touch-up – Structure and Equipment
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BUILDER shall prepare coating repair procedures suitable for the paint system involved.
Areas where the coating is damaged, but the first coat is undamaged, as the result of
improper application or mechanical damage shall be repaired by power wire brushing
back to the prime coat followed by the application of the following coat(s) as specified in
the relevant paint scheme.
Areas where the coating system is damaged through the prime coat shall be repaired by
power tool cleaning and applying the full coating system as specified for that area.
Touch-up shall not be executed when the surfaces are less than 3° C above dew point or
when the air relative humidity is greate
For equipment delivered completely painted BUILDER shall apply in the required colour
either a complete final coating or a touch-up coating which shall be decided in
consultation with CLIENT.
3.3
Hull Markings, Operating Instructions and Equipment Tagging
3.3.1
Hull markings
Hull markings shall be outlined in weld bead and in-filled with paint in accordance with the
following:
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Markings shall be painted in “white” colour unless specified otherwise with paint that is
compatible with the underlying coating.
Weld bead markings shall be grit blasted to SA 2½ after welding and prior to painting.
Tank number shall be welded near each bottom plug and engraved in the plug.
In way of each manhole on the Main Deck and manhole cover the tank numbers to be
marked in weld bead in letters and figures of 100 mm. high.
For weld bead markings stainless steel welding rods shall be used..
The applied hull markings shall be according to class and shall include (but not be limited
to) the following:
Barge Name
CLIENT’s name in special colour
Barge principal dimensions
Load line marking
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3.3.2
Draft marks
100 mm long weld bead shall be put down on the Main Deck to mark each web frame
position at the BARGE centreline over the full length of the BARGE.
Tank markings 150 mm high and 50 mm width shall be painted on port and starboard side
shell at each water tight bulkhead.
Tank markings 300 mm high and 50 mm width shall be painted on all watertight
bulkhead crossings on bottom plating.
Equipment tagging
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All valve operating hand wheels or levers shall be identified with brass label plates
indicating the valve function, the space served, and direction for opening or closing.
Names and number to be engraved with letters and numerals at least 10 mm width.
All electrical controls shall be provided with laminated and engraved label plates
indicating the circuit or equipment served.
Note: All equipment in the pump room as well as the bridle retrieval winch and power pack
on the weather deck will be provided with brass plates indicating the nature and purpose of
the piece of equipment.
3.4
Other Means of Corrosion Protection
3.4.1
Cathodic protection
A cathodic protection system shall be installed for the underwater part of the Barge in way of
the bilge strakes and stern skegs anodes. The quantity and size of anodes shall be sufficient
for a three (3) year protection in tropical seawater conditions assuming a five (5) % damage to
the hull coating. For the sea chests bolted anodes shall be fitted with at least 4 pieces each 10
kg per sea chest. BUILDER shall prepare calculations and an Anode Plan for the design of
this system.
4.0 EQUIPMENT SPECIFICATIONS
4.1
General
The main and auxiliary machinery for the Barge is primarily situated in the pump room, and
on the Main Deck. The pump room is situated at the lower deck level .
4.1.1
Pump Room Operating Procedures
The following pump room operating procedures shall be adhered to:
 Major ballast handling operations shall be executed using both ballast pumps
simultaneously. The generator set shall be used for electrical supply to the pump room,
the winch room and the Main Deck. Ballast operations shall be controlled from the pump
room and ballast valves shall be manually opened and closed.
 Minor ballast handling operations during dead ship condition in a contingency situation
shall be executed using one (1) ballast pump.
4.1.2
Notices and Instructions
General instructions shall be posted in engraved plates in the applicable rooms:
 One (1) for starting up diesel engines from a “dead ship” condition.
 One (1) for starting up the ballast system.
 Specific notices shall be arranged for battery boxes, air system, electric shore connection,
and similar, as appropriate.
4.1.3
Lifting Points
BUILDER shall install lifting points arranged as lifting padeyes, beams or clamps as
appropriate directly above all equipment including valves such that handling during
maintenance and change-out tasks can be executed in a safe and efficient manner.
BUILDER shall supply as a minimum two (2) chain blocks of a capacity appropriate to the
heaviest components, typically an SWL of 3,000 kg.
Each lifting arrangement shall be tested and clearly marked with its safe working capacity.
4.1.4
Fire Fighting
The provided fire fighting equipment shall be according to classification rules and shall
include (but not be limited to) the following: five (4) 12 kg certified portable powder fire
extinguishers and three (2) 6 kg certified CO2 fixed fire extinguisher to be arranged as
follows:
 Pump room:
2 powder extinguisher
2 CO2 extinguisher
 Control room:
1 powder extinguisher
 Stair shed:
1 powder extinguisher
4.1.5
Machinery Space Ventilation
Independent ventilation shall be supplied to the following machinery spaces:
 Pump room (forced supply and natural exhaust).
 control room (natural ventilation).
Ventilation requirements are:
 Mechanical ventilation for pump room, control room and shall be through mushroom
vents fitted on the Main Deck with sufficient capacity to run all engines under full load.
The capacity should be at least 10 changes per hour of space volume.
 Trunks shall be arranged to supply fresh air close to diesel engine intakes and at various
locations 2.5 m above floor plating. Supply and exhaust trunks shall be fitted with electric
fans controlled from adjacent panels.
 Mushrooms shall be fitted with grease nipples and of a closable type by means of a
hand-wheel on top with stainless steel square-threaded rods.
 All penetrations through the Main Deck shall be well rounded and deck-plating thickness
adjusted to suit the “lost area”. Flanges of the penetration pieces shall be arranged close to
the deck plating, 150 mm maximum.
4.1.6
Equipment Foundations
Equipment foundations shall comply with the following:
 Substantial equipment typically pumps, primer movers, generator units, tanks, winches,
control consoles, marine and deck fittings shall have individually designed foundations
incorporated into the hull structure to accommodate substantial static and dynamic loads
and maintain dimensional alignment beyond the capacity of the surrounding hull
structure.
 Particular care shall be taken during installation to assure proper alignment of all
machinery with surrounding structure and piping.
 Anti-pounding foundations shall be fitted.
 A study on the static and dynamic loading(s) of the diesel engines and generators on their
foundation shall be issued by the engine supplier. Using this information BUILDER shall
design suitable foundations and submit detailed calculations to show the adequacy of the
foundations prior to start up of any units.
4.1.7
Access Ladders, Steps
Steel vertical access ladders shall be provided at manholes or hatches for access to tanks,
voids and machinery compartments.
 Ladders shall have uniformly spaced rungs with sufficient distance to adjacent structure.
They shall be arranged for good use of internal space and straightforward routings.
 Where necessary handholds to be provided.
 To assist safe and proper passage, steps shall be arranged at web frames and bottom
girders. Also, at non-watertight bulkheads with handgrips to assist movement through
bulkhead openings.
4.1.8
Access Stairs
Access to the pump room, control room shall be arranged via a staircase.
4.1.9
Doors
Hinged watertight doors shall be installed at the entrance to the stair shed and the winch room
and shall be arranged as follows:
 Of steel construction and fitted with locking dogs
 Clear opening of 1800 mm x 800 mm.
 A sill height complying with Load Line Convention
 Hold back hooks and eyes fitted.
 Steps, platforms and handrail shall be provided, as required.
4.2
Pump Room Equipment
The layout of the pump room shall be based on optimising the performance of the pumps i.e.
minimising the piping flow resistance as well as minimising the static suction head of the
pump. The following main equipment shall be installed in the pump room:
 Two (2) electromotor driven ballast pumps.
 Two (2) generator set.
 One (1) electrical switchboard.
 One (1) oily bilge system c/w sludge pump, oily water tank and oily water separator.
4.2.1
Ballast Pumps
Two (2) horizontal centrifugal type ballast pumps with each a maximum operating
performance of 1080 m3/hr at approx. 20 m water head shall be installed in the pump room.
The ballast pump will be driven via a transmission by a electromotor 780 rpm. Gauges will be
provided to read suction pressure and delivery pressure.
Oily Bilge System
The system with all piping, valves, changeover valves, strainers and pumps necessary to perform
the functions shall be conform to the regulatory rules for the prevention of pollution at sea. The
oily bilge system shall collect dirty oil from all fuel and oil tanks, generator diesel engines,
gearboxes, pumps and drip trays etc. Moreover, the oily bilge system shall collect bilge water
from the pump room and the winch room for storage in the oily water tank. The bilge water shall
be separated via one (1) separator unit with processed water being discharged overboard and
waste oil stored in the sludge tank. The sludge tank shall have one (1) sludge discharge pump
that shall take the waste oil from the sludge tank to the Main Deck discharge station which, in
turn, shall be provided with an international connecting flange for off-loading from the Barge .
4.2.2
Oily Water Tank and Sludge Tank
The sizes and performances of the bilge holding tank and sludge tank shall be in compliance with
the MARPOL regulations. Both tanks shall be located in the pump room and shall be fitted with
a vent pipe with flame resistant mesh, sounding pipe, drain plug, raised manhole and supply
valve. In way of the suction line electrical heating shall be provided in the sludge tank.
4.2.3
Sludge Discharge Pump
No. off
Capacity
Type
Construction
Electric motor
4.2.4
:
:
:
:
:
1
15.7 m3/hr. at 30 m. head.
Horizontal, Screw
Cast iron body, stainless steel rotor
440 V, 3 ph, 60 Hz
Oily Water Separator
No. off
:
1
Capacity
:
0.25 m3/hr x 15 m head.
To be IMO MEPC 107/49 approved.
4.2.5
Sea Chest
The high and low level sea chests at the forward location shall be of heavy steel construction
complete with galvanized steel gratings, stainless steel bolts and nuts. Grating panels shall be
underwater removable of hinged type, with mash size subject to Client approval. The strainers
at each sea chest location shall have a minimum free opening of 2.5 times the area of the pipe
to the sea chest.
4.2.6
Generator Set
Two generator of 250KW shall provide the electric supply to a switchboard for the following
main services:
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All electrical equipment below deck.
440 V deck supply (3 ph,60 Hz for welding) or 220 V deck supply (lighting).
Design of generator unit:
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Of an approved marine type to standards set out in Section 7.0
Alternator:
S1-continue, 3x440 Volt, 60 Hz, 1800RPM, IP 22
Skid mounted assembly with vibration dampers
Diesel engine electrically and hydraulic started and maximum speed of 1,800 rpm and
equipped with:
Electric starter plus 1 hydraulic spring starter
mechanical governor arranged for speed control (adjustment) locally
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lubrication and cooling systems arranged for continuous working at inclinations up
to 15° trim and 30° list.
direct fuel injection system complying with NOx emission according to Regulation
13 of Annex VI of MARPOL 73/78 (optionally).
crankcase breather with air/oil separation system
hand sump pump
flywheel
air filters with service indicator
fuel pumps (priming and transfer)
lubricating cooler
lubricating double and spin on filter
lubricating pump
raw water cooling system with heat exchanger, expansion tank, and engine driven
heavy duty seawater pump
fresh water system with engine driven pump and oil cooler
Note 1: Fuel oil line between fuel oil tank and engines shall be provided with filter system
based on duplex racor filters. The filter system is to allow reading of filter blockage and filter
change out without stopping the engines (differential pressure reading, double filter system).
Note 2: The engines’ raw water system shall be connected with the main cooling water tank
and be filled with fresh water and corrosion inhibitor, type to be approved by SUPPLIER.
4.2.7
Diesel Engine Exhaust System
An efficient exhaust system shall be arranged for all the diesel engines installed onboard the
Barge. Each engine shall have an exhaust system fitted with a silencerand spark arrestor and
arranged so that exhaust fumes are carried clear of the Main Deck. Special attention shall be
paid to termination of exhaust pipes in order to minimize water ingress with a drain trap fitted
below Main Deck and a flapper fitted to the open end of the exhaust pipe(s). Expansion joints,
bends and flexible pieces shall be arranged as required. Each line shall be provided with a
temperature gauge.
Within the enclosed pump room the exhaust and drain shall be lagged with calcium silicate
blocks and wrapped with mineral glass clothes. Externally, the exhausts shall be fitted with
mesh guards to prevent personnel accidentally being burnt or for this purpose the exhaust
pipes to be fitted inside a hatch with a cover opening aft-wards with an angle of 60°.
4.2.8
Diesel Engine Fuel Oil System
Fuel oil for the various diesel-powered units shall be stored in one steel tank located in the
pump room. The tank shall be provided with a manhole, a 50 mm filling connection to Main
Deck complete with blind flange, a 65 mm vent pipe terminating above Main Deck in a
bonnet type pipe head and flame screen, a 25 mm drain connection including a pocket and a
valve and separate manifold to the diesels. The fill and vent connection shall penetrate the
Main Deck and shall terminate 150 and 600 mm above the deck elevation, respectively, in
one shared coaming.
Stainless steel bolts shall be used. A suitable tank contents gauge shall be fitted; moreover a
sounding pipe with self-closing device shall be fitted. Under sounding pipe a striking plate to
be fitted. Generally, fuel supply line shall be steel pipe, but below 15 mm will be seamless
annealed copper tubing and the fittings shall be compression type fittings. Flanges shall be
provided for fittings to tanks and equipment. A fuel strainer shall be installed in the
equipment supply line.
4.2.9
Instrumentation for Diesel Engines
Diesel Engines Control:
 Speed control.
 Running light.
 Emergency stop
 Alarm lights
 Oil pressure alarm
 Over-speed alarm
 Overheat alarm
 Cooling water level alarm
 Lubrication oil temperature alarm
The following instrumentation is to be provided for all engines both locally as well as in the
control room:
 Tachometer and running hour meter.
 Lubrication oil pressure gauge.
 Cooling water pressure gauge.
 Cooling water thermometer.
 Lubrication oil thermometer, cooler inlet.
 Lubrication oil thermometer, engine inlet.
 Exhaust gas thermometer.
 Start and stop module.
Protection devices shall be incorporated in all engines systems to automatically shut down in
case of:
 Low lubrication oil pressure.
 High cooling water temperature.
 Over-speed.
 High lubrication oil temperature alarm.
Acoustic and visual alarm signals shall operate in the pump room, winch room, control room
and on Main Deck.
4.2.10
Cooling Water Tank
One (1) cooling water tank shall be situated in the vicinity of the pump room:
 Sized to satisfy the cooling requirements of the water-cooled machinery installation for
24 hrs operation under full load for 7 days a week.
 Both the inlets and outlets for the tank(s) shall be provided with manually operated valves
to isolate the piping from the tank when the Barge is laid up.
 By-pass lines shall be fitted to allow for the filling and circulating of antifreeze solutions
in the piping system and the cooling water expansion tank.
4.2.11
Cooling Water Expansion Tank
One (1) cooling water expansion tank of typical capacity 5 m3 shall be incorporated into the
hull structure in (or close to) the pump room for:
 Expansion in the cooling water system.
 Water level indication.
 Temporary operation of genset / winch power pack during lay-up period (to avoid
antifreeze solutions to dissolve in the cooling water tanks).
The tank shall be arranged as follows:
 Tank shall be fitted with a filling pipe from Main Deck, an air pipe, drain plug, tap, sight
glass, manhole and valves.
 Tank shall be coated internally and externally using epoxy paint.
 Brass plate shall be secured adjacent to tap with the instruction: “COOLING WATER,
NOT DRINKING WATER”
4.2.12
Control Room
The following shall be installed in the control room at tween deck level:
 One (1) steel desk, sized 2m x 1m, all drawers provided with stopper and lock.
 Two (2) adjustable swivel chairs.
 Two (2) wall-mounted lockers.
 Lighting for both general and localized illumination.
The walls of the control room will comply with a 60 dba sound level according to
classification rules.
5.0 PIPING SYSTEMS
5.1
General Design
CLIENT has indicated in the Specifications the medium, nominal bore diameter and working
pressure necessary for BUILDER to perform the detailed design of the piping system in
compliance with the design requirements.
In general, piping shall be sized to take account of the fluid handled in terms of viscosity,
temperature, pressure, pressure surges, total pipe length, system frictional losses, static
suction lift and discharges. The limiting velocity of liquids and gases in the systems shall be
in a range used for normal shipbuilding practice.
5.2
Piping
5.2.1
General
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5.2.2
Steel pipes shall be of seamless manufacture and hot dip galvanized.
Copper and stainless steel pipe shall be of seamless manufacture.
No piping shall run through fuel or fresh water tank(s).
Pipe routes above electrical and mechanical equipment shall not permitted.
Threaded fittings shall not be allowed.
Drains shall be installed at lowest points to drain the systems to avoid freezing.
For lubrication oil and fuel piping, after burns have been removed and pipes have been
degreased, derusting preservations shall be made by means of Parkerization.
Pipe Jointing and Connections
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In general all ballast, bilge and vent lines shall be provided with welded connections of
the outside sleeve type and flanged joints shall be used for valves, fittings and
connections to equipment.
Dresser type couplings of a CLIENT-approved make shall be used as expansion joint(s)
for ballast and vent lines in between rigid connections, as required. The couplings shall be
protected against corrosion to a similar standard as pipes and shall be suitable for use in
seawater and fuel oil.
Hydraulic lines shall be arranged with compression type fittings.
Flanges shall be of steel plate welding type without neck hub for steel piping and brass
brazing for copper piping. All flanges shall be finished with plain contact surface and
welding section shall at least have the same thickness as the pipe.
BUILDER shall supply and install all fittings and accessories necessary to complete all
piping connections to tanks and equipment, including connections directly to CLIENT’s
Provided Items.
5.2.3
Flanges and Bolts
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5.2.4

Fitting of Gaskets and Seals

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

5.2.5
Flange faces shall be greased and protected with covers from mechanical damage and
extraneous matter upon receipt of flange materials until installed during final assembly.
Flange bolt-holes shall be symmetrically arranged about the pipe horizontal and vertical
centrelines, except where connections to equipment dictate otherwise.
Bolts shall be able to move freely through bolt-holes and remain perpendicular to the
flanges during fit-up. There shall be a clear gap between the two flange faces before
gasket fitting such that there is sufficient flexibility to install and replace gaskets.
The flanges shall be brought together flush and square without forcing so that the entire
mating surfaces bear uniformly onto the gasket and then mated up with a uniform bolt
tensioning method.
Flanged joints shall be fitted with a reinforced synthetic rubber gasket suitable for
seawater and diesel oil.
Asbestos material is not allowed.
Special gaskets for exhaust gas lines shall be used.
In the event that any flanged connection is disassembled for inspection, repair, or
re-fitting then upon re-assembly the gasket shall be replaced by a new, unused item.
Fitting of Thermal insulation
No insulation shall be applied to piping or equipment until pressure tests are complete, any
leaks located and repaired, and work has generally been cleaned and painted.
Instrument connections, relief valves, support legs, spectacle blind flanges, drains shall not be
covered with insulation material.
All seams shall be lapped a minimum of 50 mm circumferentially and longitudinally.
Longitudinal laps shall be arranged to shed water.
Banding shall be placed adjacent to each circumferential lap with intermediate bands spaced a
maximum distance of 300 mm. On vertical piping runs, the adjacent lower section shall
support the covering with two s-clips made from the banding material.
Longitudinal joints shall be radially staggered.
All cut outs in metal jacket-ing shall be weatherproofed by flashing with mastic
Flanges, expansion bellows, valves and control valves shall be provided with removable heat
shield insulation cover. Removable covers should overlap adjacent permanent insulation by
100 mm
Insulation for heat conservation, condensation prevention or personnel protection shall be
fitted to all piping and equipment which are operating at, or above, 60° C
Insulation material shall be non-combustible, not contain any asbestos, but typically comprise
mineral wool, calcium silicate, cellular glass, or any other suitable material
After approval by CLIENT insulation material to be covered with fibreglass / aluminium
cloth for enclosed space applications and covered with sheet metal of stainless steel for
weather exposed areas with a thickness of at least 0.5 mm
5.2.6
Manometer / Vacuum Meter
Suction and pressure gauges for each ballast pump shall be fitted locally and inside the
control room.
Pressure gauges shall be mounted before and after strainers, filters and shut-off valves.
Vacuum and pressure gauges shall have a diameter of Ø100 mm and are glycerine filled.
The dials shall indicate pressure in bar with the scale range typically 2 times the working
pressure and shall be arranged for easy observation.
5.3
Pipe Colour Coding
All piping shall be cleaned and coated to match the adjacent areas. The following systems
shall be coded in accordance with the regulatory rules: sea water, fresh water, fuel oil,
lubricating oil, hydraulic oil and hydraulic accumulators at flanges, at valves and at regular
distances, typically 3 m spacing, as shown on isometric pipe drawings.
One (1) signboard shall be mounted in the pump room indicating the colour coding system.
5.4
Tank Venting System
The vent system is to be arranged according to the following:
 Void tanks are not provided with ventilation.
 Each ballast tank shall be provided with an independent vent line to a vent head at the
barge side or bow.
 All tank vents shall be suitable for seawater and fuel oil and vent heads on Main Deck
shall be of an approved removable type
 The penetration pieces of the vent pipes at Main Deck shall be provided with flange to
10K standard welded under the deck so when removing the vents deck will be flush with
blind flanges.
 All vent pipes shall be hot-dipped galvanized.
 Flanged joints shall be kept a minimum and all bolts and nuts shall be galvanised.
 Dresser type expansion joints shall be used in between watertight bulkheads and shall
have at least the same corrosion resistance as the air pipes.
5.5
Tank Ballast System
The tank ballast system shall comprise of:
 Two (2) horizontal centrifugal pumps (each driven by a electromotor) complete with
piping and valves arranged to take suction from:
 the low level sea chest, or
 high level sea chest, or
 from a ballast tank, or
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from the pump room (emergency suction)
and arranged to discharge:
into ballast tanks, or
overboard.
Strainers after each sea chest and before the inlets of the pump.
Drain valves at the lowest points in pump room.
Double shut-off valves at each sea chest.
Dresser couplings as required.
The strainer housing shall be galvanized steel as the piping. The removable cover, bolts and
nuts and the filter shall be stainless steel. A de-airing valve shall be fitted on top of the
strainer.
The overboard discharge lines shall be arranged above the maximum waterline to port and
starboard.
The ballast system will be provided with an emergency suction opening in the pump room
(being as high as possible but well below the grating and machinery level.
5.6
Valve Operation
All valves in the ballast system shall be manually operated, and remote operated. All valves
shall have a clear mechanical indication of the open and closed position of the valve as well
as a brass nameplate, to be fitted on the hand wheel.
6.1
6.0 BARGE OUTFITTING
CLIENT have made a preliminary calculation of the Equipment Number for the Barge to
provide the basis for the specification of deck equipment. BUILDER shall provide a final
calculation and provide deck equipment to suit. The deck outfitting consists of towing
equipment, mooring equipment, anchor-handling equipment, means of access and navigation
lighting.
Towing Equipment
All towing equipment is to be provided with certificates and stamped. Manufacturer
certificates only will not be accepted.
6.1.1
Towing Brackets
Smit towing brackets or equivalent with a proof load of 200 metric tons shall be provided. A
total of two (2) pieces at starboard side and two (2) pieces at port side shall be arranged on the
Main Deck at the bow facing forward. Necessary fairleaders shall be provided for each
bracket. Fairleaders shall be closed at the top to retain the towing chain.
Towing brackets are to be tarred conserved and to be fitted on steel doubler plate (20mm).
Below deck construction shall be according to capacities of towing brackets and fairleaders.
6.1.2
Towing Bridle
The towing bridle shall comprise of:
 One (1) wire forerunner, galvanized steel wire, Ø58 mm x 55m long, 6 x 36 WS + IWRC,
2200KN MBL, complete with 2 hard eyes and one Green Pin shackle of suitable strength.
 Two (2) wear resistant chain of Ø34mm x 27 m long, U3 grade.
 Two (2) bridle stud link chains of Ø58mm x 17.9 m long, U3 grade, complete with end
links at both ends.
 One (1) triangle plate of equivalent strength connected to the forerunner chain and the
two bridle chains shall be provided and installed (proof load 200 metric tons).
 Bridle chains, forerunner and retrieving wire shall be connected to triangle plates using
Green Pin shackles of same strength.
6.1.3
Bridle Retrieval Winch
The bridle retrieval winch shall be installed on the Main Deck at the bow The winch shall be
skid mounted with stainless steel bolts and shall be electrical hydraulically driven and
controlled. The winch capacity shall have a 10 metric tons pull at 9 m/min and set at 15
metric tons pull at stall. In the event that the winch has a higher stalling pull capacity, then it
will be set at 15 metric tons and permanently locked as such. Load testing shall be witnessed
by CLIENT at the design stall capacity. The winch shall be provided with:

A single wire barrel with reel capacity of 75 m x Ø25 mm wire (MBL 45 ton) complete
with:
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Manually operated coupling – it shall be possible to lower the bridle manually without
electrical hydraulic power.
Retrieval wire: 1” x 50m, one end hard eye, (galvanized).
Snatch block: capacity suitable for 1” steelwire.
A disk brake, in between motor and gearbox, spring applied and hydraulically released
(fail safe), capacity equal to winch pull capacity at stall.
A warping head of 15 metric tons capacity for mooring rope handling.
6.2
Mooring Equipment
6.2.1
Mooring Fittings
Fourteen (14) double bollards of welded construction of 350 mm outside diameter complete
with stoppers shall be located on the upper deck. All edges shall be rounded and all rough
surfaces smoothened. The bollards shall be designed for a safe working load of at least 50 T
in any direction and provided with reinforcements under deck as required.
Two (2) Panama Canal type mooring chocks shall be provided in the vicinity of the double
bollards. Minimum free opening shall be 350 mm x 250 mm.
6.2.2
Mooring Lines
BUILDER shall supply eight (8) mooring lines. Each line shall be of white polypropylene
rope, 10 inch circumference x 120 m long with spliced eyes at both ends (MBL 70 mt).
6.3
Anchor Handling Equipmen
6.3.1
Anchor and Anchor Chain
One (1) anchor of stockless type with high-holding power capacity and minimum weight of 6
metric tons complete with anchor chain (Ø46 mm x 300 m, grade Q3), swivel shackle and
connecting shackles and test certification. The required anchor weight shall be verified by
BUILDER. The anchor shall be painted with two coats of asphalt varnish.
One (1) stockless anchor: 6 metric tons high holding power (Hall type).
6.3.2
Anchor Housing
The bow anchor shall be stowed inside an anchor pocket incorporated into the bow and shall
be based upon the design drawings and a pull-in test. The pull-in test shall be undertaken by
BUILDER and witnessed by CLIENT using a full-scale mock-up of the proposed pocket
design such that modifications which benefit the handling of the anchor can be incorporated
into the final anchor pocket design prior to the start of fabrication for the bow section.
The anchor pocket shall be fitted with rubbing strake protection. The rubbing strakes shall be
provided with reinforced corners of adequate radius to minimize chafing damage to the
anchor chain. Chain sheave bearings are to be seawater resistant and self-lubricating. The
chain entrance into winch room shall be as high and as small as practical with a suitable
closing device to prevent water ingress to the winch room.
A grating cover shall be installed on Main Deck to give a good sight on anchor chain gutter
and anchor pocket and provide access as required. The anchor must self stow with the flukes
and crown within the line of shell when stowed. Plating in the vicinity of the anchor pocket
shall be especially strengthened to prevent punching by the anchor flukes.
At Main Deck level, adjacent to the chain gutter a seawater tap will be provided, which will
be branched off from the discharge side of the ballast pumps. Piping diameter and fittings are
to be confirmed by CLIENT.
6.4
Internal Access
The means of internal access shall be provided:
 Control room: One (1) access door .
 One (1) emergency escape from the pump room to the store room, 830mm*830 mm,
provided with a with a 600 mm high coaming and a watertight hinged steel cover
complete with central closing device fitted with hand wheels.
6.5
Means of Access
6.5.1
Stair Shed, Manholes, Hatches, Emergency escape, Covers etc.
The following means of access shall be provided in or on the Main Deck:
 One (1) stair shed with a staircase down to the pump room.
 One (1) emergency escape from the anchor winch room to deck, 830mm*830 mm,
provided with a with a 600 mm high coaming and a watertight hinged steel cover
complete with central closing device fitted with hand wheels.
 Two (2) manholes per ballast tank, 600 mm*400mm, flush with Main Deck situated close
to the bulkhead provided with a watertight cover with stainless steel bolt (with suitable
grease), a vertical ladder and an intermediate platform.
 Two (2) T-wrenches for manhole covers and deck valves to be provided.
 One (1) flush deck hatch c/w watertight cover for lowering spare parts and equipment into
the pump room measuring typically 1.8 m x 1.5 m fitted with a bolted steel hatch cover.
 All bolts and nuts shall be properly greased (Molycote) prior to fitting. Gaskets shall be of
reinforced neoprene or equivalent
6.5.2
Bottom Plugs
One (1) l flush bottom plugs with lead gasket shall be mounted in the hull bottom plating for
each watertight compartment. Two (2) T-bar keys shall be provided for working the bottom
plugs. Similar bottom plugs shall be fitted to the loose fitted tanks installed onboard the
Barge.
6.5.3
Pilot Boarding Ladders
Four (4) vertical ladders shall be installed along the length of the Barge, port and starboard.
The ladders shall be incorporated into the fendering arrangement and hand-grips shall be
arranged at the top of each ladder with suitable means of connecting safety ropes for pilots.
6.6
Safety Plan, Signals
6.6.1
Safety plan
and Life-saving Appliances
A Safety Plan shall be prepared for the Barge. BUILDER shall prepare, as part of the final
documentation, the Safety Plan for the Barge. An A1-size plan shall be wall-mounted in a
water-proof enclosure close to the companion way at the Main Deck.
6.6.2
Life-saving appliances
Four (4) life buoys complete with lifeline shall be stowed in a purpose made rack placed
adjacent to the navigation lights mast(s). Each life buoy shall be marked with the name of the
Barge and the port of registry as noted in the principal particulars.
Eight (8) life jackets shall be stowed onboard the Barge.
7.0 ELECTRICAL EQUIPMENT
7.1
Introduction
BUILDER shall adopt the Electrical Schematic Wiring Diagram and the Electrical Load
Balance as the basis for the design of the electrical installation onboard the Barge. BUILDER
shall issue a final Electrical Load Balance for CLIENT approval. For the electrical installation
onboard the Barge, BUILDER shall:
 Install suitable earthing for control panels.
 Install all cables, cable racks and trays.
 Make all cable terminations on switchboard and consumer side.
 Make tagging for all equipment and cables. BUILDER to submit it’s system for tagging
notation and the design of the tags for CLIENT approval.
 Carry out installation checks to verify all systems and equipment are fully functional and
made ready for commissioning in accordance with manufacturer’s instructions.
 Record all tests on test sheets and obtain CLIENT and Classification Society approval.
Generally:
 The atmosphere inside the Barge mostly will be a sea atmosphere, relative humidity of air
in the machinery space up to 96%, such that special consideration shall be given to the
selection of materials. Parts with inadequate corrosion protection shall not be accepted. A
single paint coating shall not be considered as "sufficient", galvanized or chemical
built-up protection is preferred. Anti-corrosion treatments such as paint touch up shall be
completed when mechanical damage such as drilling or sawing occurs. The minimum dry
film thickness of coating shall be 100 microns.
 Panels, boards and boxes shall have protection degree IP22.
 All cables shall be of marine approved type, flame retardant according to IEC 332-3, with
galvanised steel braiding covered and a J halogen-free outer jacket.
 The material and construction of electric equipment shall be of European make unless
otherwise specified and shall comply with marine standards or with manufacturers and
BUILDER's standards subject to CLIENT approval.
 Special attention shall be paid to small electronic components such as printed circuit
boards that shall be protected by a varnish coating.
 The electrical installation onboard the Barge shall be compatible with the latest editions
of the recommendations of the International Electro-Technical Commission.
 The drawings of the electrical installation onboard the Barge shall be drafted in
accordance with the recommendations of the International Electro-Technical
Commission.
7.2
Electrical Supply
The following three-wire system without neutral shall be provided:
a. 440 Volt b. 220 Volt c. 24 Volt -
60 Hz system for power
60 Hz system for lighting and control circuits
direct current for starting and emergency lighting and control systems.
All systems shall be provided with a floating earth fault indication.
7.3
Generating System
Electric power shall be generated by two (2) diesel generator of 284KW, 440 V, 3 phase, 60
Hz.
Furthermore it will be provided with:
 protection degree IP 22
 air to air heat exchanger.
 Brush-less excitation.
 insulation class F rated for 65ºC. ambient temp.
 no separately driven fans.
 inspection covers for rotating rectifiers at non-driven end.
 nominal voltage 3 x 440 V, 60 Hz.
 star configuration, star point accessible for measuring.
 stand still heating.
If the voltage regulator is built in the machine, it will be accessible while the machine is
running, without danger of touching live conductors or rotating parts.
7.4
Electric Motors
All electrical motors shall be supplied by one manufacturer and standardized with regard to
size and type with design according to IEC 34 and UEC 72 standards and shall be rated for
continuous service, insulation class F, operating temperature rises shall be limited to 90%,
maximum speed limited to 1800 rpm with a casing to IP 22 standard. Identification
nameplates with technical data shall be fitted
7.5
Lighting Transformers
In total two lighting transformers shall be installed.
 Three phase
 Delta-star configuration
 Dry insulation
 Mounted in IP 22 housing
 Secondary voltage 3x220V AC, star with accessible neutral point.
Of these, one transformer shall have a primary voltage of 3 x 440V, 60Hz and shall
be supplied from the switchboard. The second transformer shall have a primary voltage of 3 x
440V, 60Hz with +/-5% and -/+10% tappings, supplied from the 3 x 440V, 60 Hz shore
supply connection.
7.6
Electrical Plug Sockets
7.7
Four (4) electrical plug sockets shall be installed in control room.
Switchboard
The switchboard will contain:
1. NO.1 Generator Panel, 1x 250KW generator, 440 V, 3 ph, 60 Hz.
2. NO.2 General panel & synchro panel
3. Shore connection box, 200 A, 440 V, 3 ph, 60 Hz.
4. Transformer 440V/230V, 60 Hz, 10 kVA .
5. 440V/220V AC Load panel
6. Battery charger
7.7.1
For the Alternator
Generator circuit breaker of with drawable type provided with:
1. adjustable instantaneous trip for short circuit protection
2. adjustable inverse time magnetic relay for overload protection
3. under voltage protection.
 Ammeter with selector switch to each phase.
 Voltmeter with selector switch.
 Frequency meter.
 "Power on" light.
 Automatic voltage regulator with voltage adjusting rheostat.
 Set ground fault detection lights with lamp test push button.
 Pt 100 temperature sensors (3 + 3 spare).
7.7.2
For the Shore Supplies
At the entrance (inside) separate connection facilities in one or two terminal boxes will be
provided for 3 x 440V / 60Hz .For these two incoming supplies the main switchboard will
comprise:
 Two circuit breakers interlocked with other incoming supplies.
 Selector switch 3 x440V
 Ammeter with selector switch to each phase.
 Voltmeter with selector switch.
 "Power on" lights.
 Frequency indicator.
 Phase sequence indicator.
 Set ground fault detection lights with lamp test push button.
 Capacity of shore supply shall be 3 phase 63 Amp.
 Flexible cable for shore supply shall not be provided.
7.7.3
For the 440 V Distribution
A sufficient number of moulded case, common trip, bolt-on type circuit breakers
calibrated for 50ºC shall be installed with two (2) spare circuits of 15 Amp.
7.7.4
For 230 V System
Two (2) portable 440/230 Volts transformers
7.7.5
will be provided, in the pump room .
For 24 V Systems
Refer to “Battery Chargers” herein.
7.8
Starters
Starter shall have overload and under voltage protection and be fitted with stop-start push
buttons and running lights. The overload relays will react on unbalanced phase currents and
will be temperature compensated. The enclosures will have protection degree IP 55 and shall
be located near the electric motors.
Starting methods: up to 30 kW direct on line
Starters above 5 kW shall be provided with A- meters, showing a red line marking at the
motor’s rated current.
7.9
Lighting
a) 220 Volt lighting system
 A sufficient number of lighting fixtures shall be installed to provide a general level of
illumination adequate for safe working in the following areas:
1. Pump room
200 lux.
2. Control room 200 lux
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Lighting fixture(s) shall be of fluorescent type in the pump room.
Fluorescent lamp tubes shall be of two-pin IEC type in the winch room.
All lighting circuits shall be controlled from circuit breakers at the main switchboard.
Additional lighting fixtures shall be installed locally where brighter or direct illumination
is required such as at desks, work benches and equipment locations.
b) 24 Volt DC lighting system
 24V DC emergency lighting fixtures shall be arranged in pump room and control room.
These fixtures shall not exhaust the batteries after power-down and departing the Barge.
 Number of fixtures shall provide illumination to ensure safe evacuation from each
location.
c) Switching 24V lighting system “On”
 Push-button devices shall be installed at locations - typically at doorway, stairway,
control room, to activate the 24V lighting circuit in the compartment for which the device
is designated
 After power down of the 440V system all 24V lights shall be activated.
d) Switching 24V lighting system “Off”
 Each 24V lighting circuit shall automatically switch off after a pre-set period, typically
5½ minutes. In the “off” condition all relays must be de-energized and shall not fail at
low battery power.