METHOD STATEMENT
OF
AIR BLOWING / WATER FLUSHING OF PIPES
UNIT 129
SHUAIBA REFINERY
O2
28-02-2018
Issued for Approval
VB
VB
MA
O1
03-02-2018
Issued for Approval
PAM
PAM
MA
Rev.
Date
Description
Originator
Checked By
Approved By
Kuwait National Petroleum Company (K.S.C.)
Clean Fuels Project
Kuwait
Petrofac / Samsung / CB&I
PSCJ Job No. JI-2025
Consolidated Contractors Co. (Kuwait) W.L.L
Subcontract No.: JI-2025/03-001
Subcontractor Doc. No
MS-1146-570
CONTRACT NO.
CONTRACTOR JOB NO.
DOCUMENT NO.
REV
CFP/EPC/0054-MAB1
JI-2025
P6003SHU-000-51-1-M454
O1
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
Record of Revisions
Rev. No.
Page/Section
Description
O1
-
Issued for Approval
O2
-
Issued for Approval
List of Holds
Page/Section
MS-1146-570
Description
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 2 of 19
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 3 of 19
Contents
1.
SCOPE
4
2.
PURPOSE
4
3.
REFERENCE DOCUMENTS
4
4.
DEFINITIONS
5
5.
ABBREVIATIONS
6
6.
RESPONSIBILITIES
7
7.
WORK PERMIT
8
8.
TOOLS & EQUIPMENTS
8
9.
PRE-REQUISITES
9
10. HEALTH, SAFETY, AND ENVIRONMENT
9
11. METHODOLOGY
11
12. INSPECTION & ACCEPTANCE
18
13. ATTACHMENTS
19
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 4 of 19
1. SCOPE
This method statement covers general requirement and guidelines for the air blowing / water flushing of
pipes for unit 129 by oil free compressed dry air to ensure the system is clean and free of debris in line
with project requirements.
2. PURPOSE
The purpose of this method statement is to provide the detailed methodology regarding the air blowing /
water flushing activities. The work steps are analysed, all hazards identified, and the necessary safety
mitigations are defined so that the air blowing activities can be executed in a safe and efficient manner.
3. REFERENCE DOCUMENTS
Shell DEP 31.40.50.30
Pre-Commissioning of Pipelines
Shell DEP 74.00.10.10
Shop and Field Pressure Testing of Piping Systems
Shell DEP 70.10.80.11 (Section 5.6.4)
Cleaning of Equipment
Section 4/Exhibit H/Sub Part 9
Mechanical Completion / Pre-Commissioning/Attachment H-9.2
Commissioning Responsibility Matrix
KEPA Regulations
Kuwait Environmental Public Authority Regulations
P6012MAB.000.10.10.033
Permit to Work Procedures
P6012MAB.000.10.10.002
Environmental Management Plan
HSE-ENGE-16-1413
Procedure on Environment & Social Assessment
P6012MAB.000.10.52.018
Pre – Commissioning Execution Plan
ITR – P – 0002B
Piping Cleaning and Blowing Report
ITR – P – 0003B
Piping Chemical Cleaning Report
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 5 of 19
ITR – P – 0005B
System Leak Test
P6012MAB.000.10.10.003
Waste Management Plan
SHE –ESHU-03-1406
Procedure for Solid Waste Management
P6012MAB.000.10.10.001
HSSE Plan
HSE-TSSA-05-1118
HSE Guidelines for Contractor
NoHSE-TSSA-12-1133
Safety Guidelines on Pressure Testing
HSE-TSSA-06-2029
SWP Work Permit System & Risk Assessment
P6012MAB.000.10.52.014
Procedure for Preservation of Project Equipment and Material
P6012MAB.000.10.52.002
Pipe Cleaning Procedure
P6012MAB-000-51-1-M423
Method Statement of Air Blowing For Pipelines
4. DEFINITIONS
Company
Kuwait National Petroleum Company (K.S.C) (KNPC)
Project
Mina Abdullah Refinery- Package 1 /Clean Fuels Project (CFP)
Country
Kuwait
Company Project Number
CFP/EPC/0054/MAB-1
Subcontract Number
PSCJ Job No. JI-2025
Contractor
Joint venture of Petrofac International LTD, Samsung
Engineering Co. LTD and CB&I Nederland B.V. (PSCJ)
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
CMEI Sub-contractor
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 6 of 19
Consolidated Contractors Co. (Kuwait) W.L.L ( CCC )
5. ABBREVIATIONS
QCP
Quality control procedure
HSE
Health, Safety and Environment.
SOW
Scope of work
TPA
Third Party Agency.
QA/QC
Quantity Analysis - Quality Control
RA
Risk Assessment
ITP
Inspection and Test Plan.
ECPW
Electronic-Consolidated Permit to Work
TBT
Toolbox Talk
EPIC
Engineering, Procurement, Installation & Commissioning
MS
Method Statement
PPE
Personal Protection Equipment
PEFS
Process Engineering Flow Scheme
ITR
Inspection and Test Record
AG
Above Ground
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 7 of 19
6. RESPONSIBILITIES
•
Pre-Commissioning Manager
−
Organises resources to perform the air blowing for AG pipes at site as per project specifications.
−
Ensures the activities are executed according to the relevant project specifications and complies with
the quality, schedule, & safety requirements.
−
Ensures all equipment that require calibration have valid calibration certificates.
−
Ensures that approved quality procedures and method statements are being followed.
−
Ensures that technicians are qualified /trained to perform the activities.
−
Responsible for the safe execution & compliance of this work method statement and implement safety
officer’s site intervention concerns.
•
Pre-Commissioning Engineer / Supervisor
−
Liaises with Company/Contractor to ensure all necessary permits are obtained.
−
Ensures all safety mitigations are in place including barricading and signage to alert personnel of the
work activity and hazards in the area.
−
Arranges the required resources to execute the work.
−
Attends risk assessment meetings and implements the recommendations from the Risk Assessment.
−
Controls productivity and quality of work.
−
Ensures the applicable ITR’s are signed.
−
Responsible for the safe execution & compliance of this work method statement and implement safety
officer’s site intervention concerns.
•
QA/QC Manager
−
Ensures the relevant project specifications and complies with the quality requirements.
−
Ensures all equipment that require calibration have valid calibration certificates.
−
Ensures that approved quality procedures are being followed.
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
•
−
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 8 of 19
QA/QC Engineer / Supervisor
Ensures the activities are executed according to the relevant project specifications and complies with
the quality requirements.
−
Ensures all equipment that require calibration have valid calibration certificates.
−
Controls productivity and quality of work.
−
Ensures the applicable ITR’s are signed
−
Ensures that approved quality procedures are being followed.
−
Monitors activities to safety with the authority to stop work and withdraw permit if safety is compromised.
•
Safety Officer
−
Responsible for the safe execution of the above activities in strict compliance with HSE plan.
−
Notifies the appropriate supervision or management of observed deviations.
−
Monitors all activities related to safety with the authority to stop work and withdraw the Work Permit.
−
Coordinates all safety related issues with Contractor safety officer.
•
PTW Executer
−
The work permit executor shall make all preparations and barricade the area to prevent unauthorized
personnel. Shall be always present at site and ensure safe execution of work as per method statement
and risk assessment.
−
He shall carry out tool box talk and explain all the hazards and controls to all work men prior to starting
of work.
7. WORK PERMIT
All permits related to the job shall be obtained prior to the execution of the job and copy available at work
site.
8. TOOLS & EQUIPMENTS
All tools and equipment shall be fit for purpose and shall be certified with KNPC safety certificate or by KNPC
approved 3rd party or, to include but not limited to:
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 9 of 19
−
Hoses with approved fittings (2”)-Certified hoses with proper fitting shall be used.
−
All required hand tools like spanners of various sizes etc.
−
Air Compressor (About 400 / 750 CFM Oil Free compressor with discharge pressure of about 7Bar).
−
Valves
−
Warning Tapes and Sign Boards
−
Torches
−
Temporary Spools (If required)
9. PRE-REQUISITES
Prior to starting the activity, the following activities must be completed:
−
The system to be cleaned is identified and prepared according to drawing mark-ups and P&IDs as
applicable.
−
All required safety precautions, including barriers, are installed.
−
All temporary gaskets installed during the operation should be of rated spec for air blowing operation.
−
Prior to pressurizing /air blowing walk down shall be done to ensure that all systems are ready for use.
−
Branch piping must be isolated & internals were removed from major equipment’s such as in-line filters,
control valves and other instruments to protect them from debris and damage.
−
Vent pipe shall be routed to the area away from the roads/access/community.
−
Ensure approved Work Permit Risk Assessment in place.
10.HEALTH, SAFETY, AND ENVIRONMENT
10.1. GENERAL
All personnel involved in the execution of the activity shall adhere to the HSE guidelines and work
practices in the HSE programs applicable to this project.
10.2. SAFETY INSTRUCTIONS
•
All personnel involved in the activity will use approved Personal Protective Equipment (PPE) at all times
−
Coverall / Safety helmet / Safety Glasses
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 10 of 19
−
H2S Monitor
−
Safety shoes / Gum Boot
−
Hand Gloves
−
Dust mask
−
Ear Plugs / Ear Muffs
•
Additional items such as breathing apparatuses will be provided, if required.
•
The area shall be barricaded and warning signs/notices placed at appropriate locations to identify the
cleaning operations area.
•
All required work permits will be acquired and made available at the respective work sites in the permit
boxes.
•
Nearby personnel will be made aware of the Air Blowing activity by sounding of Air horn before Air
blowing.
•
A plate or obstruction to be provided on the direct hit area of the blowing to prevent projectiles with high
velocity flying away outside of the barricaded area
•
A high standard of housekeeping shall be maintained at all times.
•
All non-essential personnel shall be requested to leave the area.
•
Two safety watchmen will be assigned throughout the air blowing period on either side to prevent entry.
•
All the activities covered in the document shall be performed by qualified & competent personnel.
•
All material and tools will be removed from the site after the completion of the job.
•
All electrical tools shall be inspected and colour coded.
•
Radio / Intrinsic safety Cell Phone communication between personnel will be established at each point of
the system to be cleaned.
•
The workers will be made aware of the safety requirements related to this activity through daily Toolbox
Talks (TBT) and by reviewing the related Method Statement (MS) and Risk Assessment (RA).
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 11 of 19
10.3. CONFINED SPACE ENTRY
•
Confined space entry requires a Confined Space Entry Permit.
•
A confined space must not be entered unless the entrant is trained and qualified for the task. Entrant
must present the Confined Space Authorisation Card to the Confined Space Attendant before entry.
•
Required confined space entry PPE must be worn while inside a confined space as specified on the Work
Permit.
•
Gas tests will be conducted by approved & calibrated gas testing devices and performed by approved
users, and will check for the content of:
−
−
Oxygen
Combustible and/or toxic gases
10.4. REPORTING OF INCIDENTS
Any safety-related incident that occurs will be reported to the discipline and HSE supervisors
immediately, and then followed up via the appropriate reporting channels to CONTRACTOR and
COMPANY.
10.5. FIRE PREVENTION AND PROTECTION
The following shall be adhered to in order to prevent fire hazards:
−
Fire extinguishers shall be available in all working areas. Fire extinguishers shall be inspected monthly
and refilled and repaired as required.
−
Smoking is prohibited except at designated locations.
−
All fires will be reported, regardless of their scale, to the supervisors for action.
−
All vehicles/equipment shall be provided with portable fire extinguishers.
−
Proper earthing procedures shall be followed for all types of generators, compressors, etc.
11.METHODOLOGY
11.1. AIR BLOWING
Air blowing will be applied to the pipelines as per approved pipe flushing plan.
Air blowing can be carried out with the following methods:
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
•
Continuous Air Blowing (Direct Blowing)
•
Quick Depressurization
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
−
Air Accumulation Method
−
Cardboard Blasting Method (Disc Rupturing)
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 12 of 19
Selection of air blowing will be according to below table:
Pipe Size
Continuous Air
Quick
Rupture Disc
Water Flushing
Blowing
Decompression
(Film)
< 2 Inch Dia
√
-
-
-
< 6 Inch Dia
-
√
-
√
< 10 Inch Dia
-
√
√
-
< 30 Inch Dia
-
-
√
-
11.2. WATER FLUSHING
Water flushing shall be applied as per approved pipe flushing plan.
During cleaning operation, the water velocity shall meet the requirement of the cleaning procedure being
followed. A high velocity flow, in the order of 3-4 m/s should be achieved in order to be effective.
The water flushing will be preferably be carried out after pressure test, the flushing will remove loose
foreign matter and debris from inside of the line and will continue until the line is proven clean, this will
prevent equipment problems during commissioning and start-up such as line blockage and /or damage
to sensitive components such as orifice plates, compressors, pump impellers, valve seats etc
Brief flushing plan for Unit 129 attached
MS-1146-570
UNIT WATER FLUSHING / AIR BLOWING PLAN BY SYSTEM AND SUBSYSTEM
System No.
System Description
Sub-System No.
Sub-System Description
Max Size,
mm
Water
Flushing
Air/Steam
Blowing
Air
Steam
02-129-01-U501
U-129 Air compressor / Plant
Air Modification
02-129-01-U501-01
Unit 129 Instrument Air compressor
Modification Package A
150
-
X
-
02-129-01-U501
U-129 Air compressor / Plant
Air Modification
02-129-01-U501-02
Unit 129 Instrument Air compressor
Modification Package B
150
-
X
-
02-129-01-U501
U-129 Air compressor / Plant
Air Modification Fuel
02-129-01-U501-03
Unit 129 Instrument Air Receiver
80
-
X
-
02-129-01-U501
U-129 Air compressor / Plant
Air Modification
02-129-01-U501-04
Unit 129 Instrument Air Distribution
Header
80
-
X
-
02-129-01-U501
U-129 Air compressor / Plant
Air Modification
02-129-01-U501-05
Unit 129 Plant Air Compressor
Modification Package
150
-
X
-
02-129-01-U501
U-129 Air compressor / Plant
Air Modification
02-129-01-U501-06
Unit 129 Plant Air Distribution Header
100
-
X
-
02-129-01-U802
U-129 OWS Collection
02-129-01-U802-01
U-129 OWS Collection Header
100
X
-
-
Remarks
11.3. PREPARATION
•
Air blowing route shall be identified and shown on a marked up P&ID or other drawings as applicable.
•
The following items shall be indicated as minimum.
−
Air supply and air blow off points
−
Major Valve positions
−
Temporary hoses, valves, blinds, spools and lead pipes
−
Hoses quality and test certificates to be checked.
•
Check sheet form and air blowing record sheets are ready.
•
Pressure gauge will be provided at compressor discharge point and air inlet point of pipeline, to monitor
the system pressure during blowing. Pressure will be controlled by valve providing (Refer sketch 13.2).
•
Temporary block valves or quick open block valves.
•
Temporary and permanent gasket.
•
The lines connected to each unit not ready for air blowing (still under construction) shall be blinded until
release for ready to air blow. They will be indicated and numbered. Installation and removal of blinds will
be controlled by means of blind list.
•
The following are considered as fragile devices and will be removed from the system.
−
Control valves
−
Check valves
−
Safety valves
−
Thermo wells
−
Orifice Plates
−
Pitot Tube Flow Meters
−
Venturies
−
Rotameters
−
Steam Traps
−
Internals or filters and strainers
•
Following items shall be isolated
−
Process impulse lines for instruments shall be isolated by means of block valve on the impulse pipe
itself and whenever possible, shall be disconnected.
−
Rotating machines such as pumps and compressors.
−
Static equipment such as columns, drums, and heat exchangers etc.
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
−
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 15 of 19
Special equipment such as De-super heaters, heating coil etc.
•
Prior to commencement of air blowing, the route and barricade shall be checked.
•
The point at which pressure is released will be barricaded to keep away personnel from line of fire.
•
Protect equipment and devices nearby air blow off point. During air blowing operation, large quantity of
dirty air will be dispersed near blow off point. This air contains sand, particles of rust etc. and might
damage or contaminate the devices or equipment. To prevent from damaging or contamination of
equipment, following measures will be considered if necessary.
To cover motors and instruments near air flow outlet with appropriate materials as applicable.
To direct the outlet flow using elbow or temporary piping to extent the outlet further towards a safe
location.
•
Ensure all the safety measures are installed such as barricades to control and minimise the personnel in
area. Area will be barricaded around the inlet and blowout point.
•
All personnel to wear ear protection.
•
Safety boards shall be installed to warn personnel of the hazard (e.g. Danger / Waring – PreCommissioning activities in Progress)
•
Establish Radio / Cell phone connection between personnel involved in the activity.
•
Ensure all witnessing and approval signatories are aware of the activity and have confirmed availability
to complete their responsibilities.
11.4. OPERATION
Once all preparation work completed, pre-commissioning supervisor shall inspect the site and check that
all protections are installed properly. Pipe restraints, clamps, supports, protection of equipment in the
vicinity of air outlet.
11.4.1.
CONTINUOUS AIR BLOWING METHOD
Air from the compressor can be directly fed into the system which is to be cleaned.
Check and confirm compressor instrumentation is working properly. Safety valves are calibrated conduct
initial start-up checks and log observations.
Ensure earthing for the compressor.
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 16 of 19
This continuous blowing method can be employed for smaller diameter pipes depend on compressor
availability. If cleaning is not effective then quick decompression by air accumulation method and Valve
operations will be employed.
•
Start the compressor and allow it to run for few minutes to reach stable operation. The operating
parameters shall be monitored. Compressor discharge can be lined up to the system. It is important the
system is not over pressurised at this stage and the system pressure must be closely monitored.
•
Check the compressor loading and unloading is ok.
•
Compressor operator to be standby during the operation.
•
No refuelling during compressor operation.
•
Allow the air to flow through the system to clean up. Flow through the system can be controlled by the air
inlet valve located at the compressor discharge.
•
If the air at discharge point is contaminated, increase the air flow by opening the valve more.
11.4.2.
•
QUICK DE PRESSURIZATION METHOD
The quick decompression of the system causes a high velocity of ait inside the pipes. This method
facilitated the removal of rust, loose scales in the piping.
•
The quick decompression method can be achieved either by Air Accumulation method (Valve Operations)
or cardboard blasting.
•
Where the quick decompression method has been selected, the pressure release can be obtained by:
−
Air accumulation Method (Depends on sacrificial valve size available)
This system which is to be cleaned is pressurised with Air. Care is taken to ensure that the system
pressure does not exceed the design pressure. The system pressure is continuously monitored by
Pressure Gauge and recorded. When the system pressure reaches 1 bar, Valves provided in the system
for cleaning are opened to depressurize the system. This is done several times to ensure proper
cleaning. If required the system pressure can be increased to a higher pressure e.g. 1.5 Bar or 2.0 Bar
provided this is below the design pressure. This operation will preferably be done using a “quick opening
valve” after having pressurized the network to the desired level of the pressure. The main header will be
cleaned first followed by the branches one by one.
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 17 of 19
−
Cardboard Blasting Method (Rupturing)
−
In this method quick decompression valves will be replaced by thin layer of Polythene film.
Decompression will start with one layer of film and gradually increased later depending upon the system
pressure and cleanliness achieved. Air blowing shall be carried out sequentially i.e. first common header
then sub header and finally branch lines as required.
•
Air supply inlets and blow off points and location shall be identified and marked up in the P&IDs or other
drawings as applicable. (Typical Sketch enclosed 12.2)
•
Large diameter lines shall be cleaned before small diameter ones.
•
Ensure all pipe supports are competed as applicable.
•
Air compressor is placed at one end of the line. The hose will be connected to the line through flange
connections (anti whip restraints will be used.)
•
At the other end of pipe flange will be covered with a thin polymer film like LDPE or LLDPE film.
•
Compressor will be started and air is introduced into the line. The system pressure is closely monitored.
The pressure is slowly raised with compressed air through a hose. When the film bursts, the pressure
surge carries debris or dirt along with it.
•
When the film bursts stop the compressor and change the film for another round of blowing.
•
The pressure at which one layer of film bursts will be recorded by trial runs. The available data shows
0.00120 inch thick film bursts at a pressure of 1.7 psig for a 4” pipe.
•
If necessary, the film thickness can be gradually increased when higher pressure is needed for blowing.
•
The air blasting pressure shall never exceed the working pressure of the system and shall never be more
than 2 barg. The quick decompression operation is normally carried out less than 2 barg pressure. The
pressure will be controlled by valve at compressor discharge point and pressure monitored by pressure
gauges provided at compressor discharge point and air inlet point of pipeline (refer sketch 12.2)
•
This quick decompression method will generate very high air velocity and will be more than 10m/s.
•
Quick open sacrificial valves will be provided at blowout point for smaller diameter lines.
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 18 of 19
12.INSPECTION & ACCEPTANCE
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The below method shall use for cleanliness acceptance criteria.
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Visual inspection
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Inspection by white cloth / Aluminium foil.
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Visual inspection
Visual inspection is the key to ensure that foreign material is not left in the system. In general for the
case of air bowing, a visual inspection, with no contamination visual to the naked eye, is sufficient to call
the “System Clean”. In case of any special requirement by vendor for inspection within packages, a
baroscopic inspection is to be considered.
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Inspection by White Cloth / Aluminium Foil
When there is any precision machine at the end of downstream in the blow path and the vendor /
company requests, a clean white cloth can be placed in the discharge path to show presence of any
debris and contaminants from the piping or the system.
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When the portion of system is ready, for Air blowing RFI will raised with mark-ups drawing.
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Dew point will be checked –50C Max at pre commissioning level for verification that the line is dried after
cleaning.
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Reinstatement
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Reinstate the lines which were removed for the air blowing if applicable.
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Install all the dropped items such as orifice plates, control valves, strainers, relief valves etc.
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Use permanent gaskets for reinstatement.
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Obtain approval from authorised person (signatories on the ITR who will be witnessing the air blowing)
that the line is free of debris and contaminants are complete.
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ITR No. P-0002B (refer attachment 13.1) shall be duly filled in and signed off.
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Preservation will be done as per project specification.
MS-1146-570
Kuwait National Petroleum Company
(K.S.C)
Clean Fuels Project
KNPC Contract No. CFP/EPC/0054-MAB1
PSCJ Job No. JI-2025
13.ATTACHMENTS
13.1. ITR NO. P-002B
13.2. TYPICAL SKETCH FOR AIR BLOWING
13.3. PRECOMMISSIONING MARKUP
MS-1146-570
METHOD STATEMENT OF
AIR BLOWING / WATER
FLUSHING OF
PIPES UNIT 129
P6003SHU-000-51-1-M454
REV. O2, 28-Feb-2018
Page 19 of 19