Ministry of Defence
Defence Standard 02-112
Issue 3 Publication Date 05 November 2007
Requirements for Windows and Window
Wipers for HM Surface Ships
Category 3
Def Stan 02-112 Issue 3
Contents
Foreword ...........................................................................................................................................................v
1
Scope ....................................................................................................................................................1
2
Warning.................................................................................................................................................1
3
Normative References .........................................................................................................................1
4
Requirements .......................................................................................................................................3
4.1
4.1.1
Protective Measures Requirements for Bridge Windows.............................................................3
Protective Measures for Windows ..............................................................................................3
4.2
Window Frames, Gaskets and Joint Requirements for Bridge Window Frames .......................3
4.3
Window Wipers and Washing Arrangements ................................................................................3
4.3.1
Types of Wipers ............................................................................................................................3
4.3.2
Policy .............................................................................................................................................3
4.3.3
Washing Arrangements ...............................................................................................................3
4.4
Portlight Arrangements....................................................................................................................3
4.4.1
Policy for Fitting ...........................................................................................................................3
4.4.2
Deadlight .......................................................................................................................................4
4.4.3
Siting and Fitting ..........................................................................................................................4
4.4.4
Protection from Physical Damage ..............................................................................................4
4.4.5
Testing ...........................................................................................................................................4
4.5
Viewing Port Arrangements.............................................................................................................4
4.5.1
Propeller Viewing Ports ...............................................................................................................4
4.5.2
Galley Viewing Ports ....................................................................................................................4
4.5.3
Magazine Viewing Devices ..........................................................................................................4
4.5.4
Citadel Air Lock and Cleansing Station Viewing Ports ............................................................5
4.5.5
Testing ...........................................................................................................................................5
4.6
General Requirements/Tests ...........................................................................................................5
4.6.1
Cold Camber - Heated Window Only ..........................................................................................5
4.6.2
Endurance Trials (Heat Cycling) - Heated Window Only ..........................................................5
4.6.3
Vibration Test - Heated Window Only.........................................................................................5
4.6.4
Shock and Vibration Requirements............................................................................................5
4.6.5
Light Transmission.......................................................................................................................5
4.6.6
Navigation Requirements ............................................................................................................5
4.6.7
Cleaning and Maintenance ..........................................................................................................5
4.7
Special Purpose Windows ...............................................................................................................6
4.8
Glass Screens ...................................................................................................................................6
4.9
Packaging, Labels for Transit, etc. .................................................................................................6
4.9.1
ii
Warning Labels and Edge Protection.........................................................................................6
Def Stan 02-112 Issue 3
4.9.2
Packaging......................................................................................................................................6
4.9.3
Responsibility for Window Panels Not Accepted at Maker’s Works.......................................7
4.9.4
Storage ..........................................................................................................................................7
5
5.1
Design Requirements ..........................................................................................................................7
Design Requirements for Bridge Windows....................................................................................7
5.1.1
Heated Windows...........................................................................................................................7
5.1.2
Unheated Windows ......................................................................................................................7
5.1.3
Winterization Requirements ........................................................................................................7
5.1.4
Shock and Vibration Requirements............................................................................................7
5.1.5
Navigation Requirements ............................................................................................................8
5.2
Design Requirements for Bridge Window Frames Materials .......................................................8
5.3
Manufacture.......................................................................................................................................8
5.3.1
Construction .................................................................................................................................8
5.3.2
Glass Laminate .............................................................................................................................8
5.3.2.1
General .......................................................................................................................................8
5.3.2.2
Freedom from Defects ..............................................................................................................8
5.3.2.3
Faults inside the Laminate .......................................................................................................9
5.3.3
Edge Finishing ............................................................................................................................10
5.3.4
Vinyl Interlayers ..........................................................................................................................10
5.3.5
Edge Sealing ...............................................................................................................................10
5.4
Electrical Requirements .................................................................................................................11
5.4.1
Heating Media Power Supplies and Connections ...................................................................11
5.4.2
Electrical Loading.......................................................................................................................11
5.4.3
Electrical Loading.......................................................................................................................11
5.4.4
Sensing Elements.......................................................................................................................11
5.4.5
Insulation Resistance.................................................................................................................11
5.4.6
Makers Certificate.......................................................................................................................11
5.4.7
Temperature Sensing Elements................................................................................................11
5.4.7.1
General .....................................................................................................................................11
5.4.7.2
Electrical Details......................................................................................................................12
5.5
Terminal Box ...................................................................................................................................12
5.5.1
Securing ......................................................................................................................................12
5.5.2
Terminals.....................................................................................................................................12
5.5.3
Cable Entries...............................................................................................................................12
5.5.4
Warning Label Plate ...................................................................................................................12
5.5.5
Makers Label ...............................................................................................................................12
5.6
Type Approval Tests.......................................................................................................................12
5.6.1
Cold Camber - Heated Window Only ........................................................................................12
5.6.2
Endurance Trials (Heat Cycling) - Heated Window Only........................................................13
5.6.3
Vibration Test - Heated Window Only ......................................................................................13
5.6.4
Light Transmission ....................................................................................................................13
iii
Def Stan 02-112 Issue 3
5.6.4.1
Method for the Determination of Light Transmission Factor (DTD 5625 and DTD 5637).13
5.6.5
Optical Tests ...............................................................................................................................13
5.6.6
Immersion Test ...........................................................................................................................13
5.6.7
Gun Blast Test - Windows in Annex C - 25 mm and above only ...........................................14
5.6.8
Additional Tests..........................................................................................................................14
5.6.9
Repetition of Type Approval Tests ...........................................................................................14
5.6.10
Acceptance Tests .......................................................................................................................14
5.6.11
Approval ......................................................................................................................................14
5.6.12
Technical Questions ..................................................................................................................14
Annex A Abbreviations and Definitions .......................................................................................................15
Annex B
Procurement Check List..............................................................................................................16
Annex C
Window Procurement List - Unheated and Heated ..................................................................17
Figures
Figure 1 - Warning Label for Lifting of Window Panels................................................................................6
Figure 2 - Warning Label for Handling of Window Panels ...........................................................................6
Tables
Table C.1 — Window Panel Ships, Laminated (Unheated).........................................................................17
Table C.2 — Window Panel Ships, Laminated (Heated) .............................................................................18
iv
Def Stan 02-112 Issue 3
Foreword
AMENDMENT RECORD
Amd No
Date
Text Affected
Signature and Date
REVISION NOTE
This standard is raised to Issue 3 to update its content.
HISTORICAL RECORD
This standard supersedes the following:
Def Stan 02-112 Iss 2
23 Mar 2001
Def Stan 02-112 Iss 1
1 April 2000
NES 112 Issue 2
December 1990
NES 112 Issue 1
Sponsorship
1.
This Defence Standard (Def Stan) is sponsored by the Marine Auxiliary Systems IPT/Defence
Equipment & Support (MXS/DE&S), Ministry of Defence (MOD).
2.
The complete Def Stan Issue comprises:
Requirements for Windows and Window Wipers for HM Surface Ships
3.
If it is found to be unsuitable for any particular requirement the MOD is to be informed in writing of the
circumstances.
4.
Any user of this Defence Standard either within MOD or in industry may propose an amendment to it.
Proposals for amendments that are not directly applicable to a particular contract are to be made to the
publishing authority identified on rear cover, and those directly applicable to a particular contract are to
be dealt with using contract procedures.
5.
No alteration is to be made to this Defence Standard except by the issue of an authorised amendment.
6.
Unless otherwise stated, reference in this Defence Standard to approval, approved, authorised or similar
terms, means the Ministry of Defence in writing.
7.
Any significant amendments that may be made to this Defence Standard at a later date will be indicated
by a vertical sideline. Deletions will be indicated by 000 appearing at the end of the line interval.
8.
Extracts from British Standards within this Defence Standard have been included with the permission of
the British Standards Institution.
v
Def Stan 02-112 Issue 3
Conditions of Release
General
9.
This Defence Standard has been devised solely for the use of the MOD, and its contractors in the
execution of contracts for the MOD. To the extent permitted by law, the Crown hereby excludes all
liability whatsoever and howsoever arising (including but without limitation, liability resulting from
negligence) for any loss or damage however caused when the Defence Standard is used for any other
purpose.
10. This document is Crown Copyright and the information herein may be subject to Crown or third party
rights. It is not to be released, reproduced or published without written permission of the MOD.
11. The Crown reserves the right to amend or modify the contents of this Defence Standard without
consulting or informing any holder.
MoD Tender or Contract Process
12. This Defence Standard is the property of the Crown. Unless otherwise authorised in writing by the MOD
must be returned on completion of the contract or submission of the tender in connection with which it is
issued.
13. When this Defence Standard is used in connection with a MOD tender or contract, the user is to ensure
that he is in possession of the appropriate version of each document, including related documents,
relevant to each particular tender or contract. Enquiries in this connection may be made of the Authority
named in the tender or contract.
14. When Defence Standards are incorporated into contracts, users are responsible for their correct
application and for complying with contractual and other statutory requirements. Compliance with a
Defence Standard does not of itself confer immunity from legal obligations.
Categories of Naval Defence Standard
15. The Category of this Naval Defence Standard has been determined using the following criteria:
vi
a)
Category 1. If not applied may have a Critical affect on the following:
Safety of the vessel, its complement or third parties.
Operational performance of the vessel, its systems or equipment.
b)
Category 2. If not applied may have a Significant affect on the following:
Safety of the vessel, its complement or third parties.
Operational performance of the vessel, its systems or equipment.
Through life costs and support.
c)
Category 3. If not applied may have a Minor affect on the following:
MOD best practice and fleet commonality.
Corporate experience and knowledge.
Current support practice.
Def Stan 02-112 Issue 3
Related Documents
16. In the tender and procurement processes the related documents in Clause 3 can be obtained as follows:
a)
British Standards
British Standards Institution,
389 Chiswick High Road,
London, W4 4AL
b)
Defence Standards
Defence Equipment and Support
UK Defence Standardization,
Kentigern House
65 Brown Street,
Glasgow, G2 8EX
c)
Other documents
Tender or Contract Sponsor to advise.
17. All applications to Ministry Establishments for related documents are to quote the relevant MOD
Invitation to Tender or Contract Number and date, together with the sponsoring Directorate and the
Tender or Contract Sponsor.
18. Prime Contractors are responsible for supplying their subcontractors with relevant documentation,
including specifications, standards and drawings.
Health and Safety
Warning
19. This Defence Standard may call for the use of processes, substances and procedures that may be
injurious to health if adequate precautions are not taken. It refers only too technical suitability and in no
way absolves either the supplier or any user from statutory obligations relating to health and safety at
any stage of manufacture or use. Where attention is drawn to hazards, those quoted may not
necessarily be exhaustive.
20. This Defence Standard has been written and is to be used taking into account the policy stipulated in
JSP430: MOD Ship Safety Management System Handbook.
Additional Information
(There is no relevant information)
vii
Def Stan 02-112 Issue 3
Intentionally Blank
viii
Def Stan 02-112 Issue 3
Requirements for Windows and Window Wipers for HM Surface
Ships
1
Scope
a)
This Defence Standard (Def Stan) in conjunction with the documents referred to herein stipulates the
arrangements, design parameters, policy, protection, manufacture and testing for heated and unheated
ship bridge windows, wipers, portlights, viewing ports and glass screens to be fitted in HM Surface
Ships, and specifies the following:
2
1)
Range of sizes of ships bridge window panels;
2)
Requirements for their manufacture, examination and testing.
Warning
The Ministry of Defence (MoD), like its contractors, is subject to both United Kingdom and European laws
regarding Health and Safety at Work. All Defence Standards either directly or indirectly invoke the use of
processes and procedures that could be injurious to health if adequate precautions are not taken. Defence
Standards or their use in no way absolves users from complying with statutory and legal requirements
relating to Health and Safety at Work.
3
Normative References
3.1
The publications shown below are referred to in the text of this standard. Publications are grouped and
listed in alpha-numeric order.
ASTM F428
Standard Test Method for Intensity of Scratches on Aerospace Glass Enclosures
BR 3021
Shock Manual
BR 6518
Bridge Window Wipers
BR 862
Naval Explosives Regulations, Surface Ships
BS ISO 3434
Shipbuilding and Marine Structures Heated Glass Panes for Ships Rectangular
Windows
BS ISO 21005
Ships and Marine Technology – Thermally Toughened Safety-Glass Panes for
Windows and Side Scuttles
BS MA 25
Ships Windows
CB 8710
Design of Naval Operational Command Systems Users Guide
Def Stan 00-35
Environmental Handbook for Defence Materiel
Part 1 Control and Management
Part 3 Environmental Test Methods
Part 4 Natural Environments
Part 5 Induced Mechanical Environments
1
Def Stan 02-112 Issue 3
Def Stan 02-102
Requirements for Air-conditioning and Ventilation (Cat 2)
Part 3 Specification for Testing and Cleaning Ventilation Trunking
Def Stan 02-716
Requirements for Winterization on HM Surface Ships
Def Stan 02-722
Requirements for the Preparation, Identification and Management of Drawings (Cat 3)
Def Stan 07-204
The Requirements for Fire Protection and Damage Control for Surface Ships (Cat 2)
Part 1 Policy for Surface Ships
Part 3 Surface Ships and Submarine Equipment
DTD 218D
Laminated Safety Glass. (Obsolete)
DTD 900
Approval Procedure for Proprietary Materials and Processes. (Obsolete)
DTD 5625
Standard Annealed Float Glass for Aircraft Glazing. (Obsolete)
DTD 5637
Polyvinylbutyral for Aircraft Transparencies. (Obsolete)
ISO 1751
Shipbuilding and Marine Structures – Ships' Side Scuttles
JSP430
MOD Ship Safety Management System Handbook
SDN 000 921 262
Rubber Gasket and Joint for Standard Bridge Window
SDN 000 921 263
Fixed Window Frame - Standard
SDN 000 921 264
Hinged Window Frame - Standard
SDN 000 924 959
Protective Portable Covers for Standard Bridge Windows
SDN 003 500 570
Rubber Gasket for Bridge Windows
SDN 003 504 378
Viewing Ports (Propeller)
SDN 003 504 538
QAWT Doors
SDN 003 504 539
QAWT Doors
SDN 003 504 540
QAWT Doors
SDN 004 473 857
Deadlight
SDN 004 473 858
Deadlight Assembly, Clearlight
SDN 006 052 126
Terminals
3.2
Reference in this Standard to any normative references means in any Invitation to Tender or contract
the edition and all amendments current at the date of such tender or contract unless a specific edition is
indicated.
3.3
In consideration of clause 3.2 above, users shall be fully aware of the issue and amendment status of
all normative references, particularly when forming part of an Invitation to Tender or contract. Responsibility
for the correct application of standards rests with users.
3.4
DStan can advise regarding where normative references documents are obtained from. Requests for
such information can be made to the DStan Helpdesk. How to contact the helpdesk is shown on the outside
rear cover of Def Stans.
2
Def Stan 02-112 Issue 3
4
Requirements
4.1
Protective Measures Requirements for Bridge Windows
4.1.1
Protective Measures for Windows
a)
Whenever welding, burning, chipping or other operations are being carried out in the vicinity of the
windows which may result in their damage, adequate protection to the in-situ glasses is to be provided.
This can best be arranged by the fitting of portable light alloy covers in accordance with Service Drawing
Number (SDN) 000 924 959, or by fire retardant hardboard shaped and sized to butt up to the window
frame completely covering the glass and secured with masking tape around the periphery.
b)
The fitting of the glass panels is to be delayed until the latest possible time. The glass panels are to be
retained in their original packaging until required for testing and fitting.
4.2
Window Frames, Gaskets and Joint Requirements for Bridge Window Frames
4.2.1 The window frames, gaskets and joints must conform to the arrangements shown on SDN 000 921
262, SDN 000 921 263, SDN 000 921 264 and SDN 003 500 570.
4.3
Window Wipers and Washing Arrangements
4.3.1
Types of Wipers
The Window Wipers may be of the following types:
a)
Air operated Pendulum, single arm or Pantograph;
b)
Electric Pendulum, single arm or Pantograph;
c)
Electric Straight Line Motion.
4.3.2
Policy
The policy for fitting the various types of wipers is as follows:
a)
For all normal applications air or electric pendulum type wipers are to be fitted;
b)
In special cases where for navigation or weaponry purposes the maximum possible swept area is
required, consideration is to be given to fitting electric Straight Line Motion wipers.
4.3.3
Washing Arrangements
a)
Care is to be taken to ensure that push taps for window washers are not sited directly above bridge
Versatile Console System (VCS) consoles.
b)
Water washing spray jets are to be sited above the window panels to ensure adequate water coverage.
c)
For general information concerning wiper spray jets refer to BR 6518.
4.4
Portlight Arrangements
4.4.1
a)
Policy for Fitting
For reasons of damage control, resistance to blast and structural strength, the number of portlights fitted
is to be kept to a minimum. They are to be positioned only where they will not impair watertight integrity
under damage conditions.
3
Def Stan 02-112 Issue 3
b)
In air conditioned spaces the portlights fitted are to be of the non–opening type and are to be NATO
Stock Item.
4.4.2
Deadlight
a)
Hinged portlights are to be fitted with deadlights in accordance with SDN 004 473 857. Those cut in
protective plating are to be fitted with deadlights of the same material as the protective plating.
b)
All non–opening portlights are to be fitted with dished light excluding plates manufactured in the same
material from which the portlight has been cut. Stowage positions for these plates are to be provided in
the compartment in which the portlight is fitted.
4.4.3
Siting and Fitting
a)
Portlights are to be fitted with the centre of the glass 1600 mm to 1750 mm above the deck.
b)
Care is to be taken to ensure that the frame beds securely on to the plating. On curved surfaces liners
must be fitted to both the frame and the deadlight hinge, if necessary, to ensure a satisfactory fit and
avoid any undue straining of the frame when the portlight or deadlight is being secured.
c)
The portlights used are to be in accordance with ISO 1751 and are to be 250 mm diameter unless
otherwise specified.
4.4.4
Protection from Physical Damage
Portlights liable to physical damage are to be fitted with steel bars on the outside.
4.4.5
Testing
a)
Hinged opening types of portlights are to be chalk tested after fitting.
b)
All portlights are to be hose tested after installation.
4.5
Viewing Port Arrangements
4.5.1
Propeller Viewing Ports
a)
Underwater ports for propeller viewing are to be fitted as required by the Contract Documents (normally
this will only apply to the first ship of a class).
b)
CASE in consultation with DERA(H) will notify the Shipbuilder of the required numbers and approximate
positions of the ports. The Shipbuilder is then to produce a drawing in accordance with Def Stan 02-722
which is to be submitted for approval showing the proposed positions, including a means of access to
them.
c)
Unless otherwise specified, the ports and frames are to be constructed in accordance with SDN 003 504
378.
d)
Final fitting of the glass panels is to be deferred until the last possible opportunity in order to preserve
their viewing qualities. Subsequent protection similar to that required for bridge windows is to be
provided as necessary (see Clause 4.1.1a).
4.5.2
Galley Viewing Ports
Reference is to be made to Def Stan 07-204.
4.5.3
Magazine Viewing Devices
For details of these see BR 862.
4
Def Stan 02-112 Issue 3
4.5.4
Citadel Air Lock and Cleansing Station Viewing Ports
a)
Each of the Quick Acting Watertight (QAWT) doors in Citadel air locks, cleansing stations and internal
sub–citadel air locks is to be supplied fitted with a viewing port of 100mm clear light diameter.
b)
The positions of the viewing ports in QAWT doors are shown on SDN 003 504 538, SDN 003 504 539
and SDN 003 504 540.
c)
A hinged light excluding dead light is to be fitted to the air lock.
4.5.5
Testing
Each viewing port is to be pressure tested in-situ before undocking by means of a suitable flooding bonnet.
The test pressure required is to be as specified in the class hull specification - see SDN 003 504 378.
4.6
General Requirements/Tests
4.6.1
Cold Camber - Heated Window Only
To operate satisfactorily within a controlled temperature range of +20°C to +40°C when fitted in a standard
frame sited in a test cabinet, the outside of the cabinet being subjected to reducing temperatures down to 40°C with wind speeds up to 45 knots and water spray (fresh and salt) with an approximate content of 3
grams water per cubic metre of air.
4.6.2
Endurance Trials (Heat Cycling) - Heated Window Only
To operate satisfactorily without evidence of deterioration after a continuous heating cycle of 1000 hours
being controlled between temperature range of 20°C to 40°C.
4.6.3
Vibration Test - Heated Window Only
To withstand satisfactorily, being subjected to a vibration test appropriate for equipment fitted in the main
region of a ship, in accordance with Def Stan 00-35 Parts 1, 3, 4 and 5.
4.6.4
Shock and Vibration Requirements
Windows must comply with the shock and vibration standards as specified in BR 3021 and Def Stan 00-35
Parts 1, 3, 4 and 5.
4.6.5
Light Transmission
Light transmission factor through the panel shall be 5% as a minimum for a nominal 25.4 mm thick panel,
(see Clause 5.6.4.1).
4.6.6
Navigation Requirements
a)
Bridge windows fixed or hinged must comply with the bridge design requirements as stated in CB 8710.
b)
Bridge windows are to be fitted with panels of laminated toughened glass and are to be in accordance
with the standard range of sizes and types as specified in the Contract Documents.
c)
Heated glasses and window wipers are to be fitted where specified, but kept to a minimum providing
navigational requirements are met.
4.6.7
Cleaning and Maintenance
Provisions are to be made to enable routine cleaning and maintenance of the bridge windows’ and wipers’
external components.
5
Def Stan 02-112 Issue 3
4.7
Special Purpose Windows
a)
The Admiral’s day and dining cabins are to be fitted with special fixed windows as required by the Class
Drawings.
b)
The sizes and positions of these windows are to be as shown on Guidance Drawings for the class of
vessel.
c)
Each window is to be fitted with a hinged deadlight in accordance with SDN 004 473 857 and SDN 004
473 858.
d)
Each window glass is to conform to BS ISO 3434 for heated windows and BS ISO 21005 for non heated
windows.
4.8
Glass Screens
a)
Unheated glass screens are to be provided in way of exposed observation positions to afford a measure
of protection. They can be hinged or fixed but are to be capable of being locked at their limits of
movement. They may be fitted with wiper units as required.
b)
The size and shape of each screen is to be dependent upon requirements as indicated on the General
Arrangement Drawing for individual ships.
c)
The glass is to conform to BS ISO 21005.
4.9
Packaging, Labels for Transit, etc.
4.9.1
a)
Warning Labels and Edge Protection
A peelable label as shown in Figure 1 shall be attached to glass window panels, near the terminal box,
lettering to be 12 mm high.
Figure 1 - Warning Label for Lifting of Window Panels
b)
A peelable label as shown in Figure 2 is to be pasted to each panel before packaging and despatch.
Also to protect edges of panels from damage, an approved pressure sensitive PVC foam strip (or
similar) is to be fitted, it will be removed just prior to the panel being fitted in its frame.
Figure 2 - Warning Label for Handling of Window Panels
4.9.2
a)
6
Packaging
The laminated glass panels should be enclosed in a water vapour-proof barrier of polythene film heat
sealable 0.25 mm thick. The waterproof barrier is to be completed by heat sealing and, before the final
seal is made all surplus air is to be excluded from the bag.
Def Stan 02-112 Issue 3
b)
All panels including “on-board” spares and those for Director Ships Logistics Engineering (DSLE) stock
are first to be enclosed as in Clause 5.2a and then packed to normal commercial standards, i.e. closed
pinewood nailed cases of 20 mm and 15 mm thickness with lids of 15 mm pinewood, reinforced stays of
20 mm pinewood. Interior lined with expanded polystyrene 37 mm and 50 mm thick.
c)
The following identification details are to be give on the outside of the packages:
1)
Description;
2)
Naval Stores unique number (where applicable);
3)
Serial Number (on top and one side);
4)
Quantity;
5)
Contract Number;
6)
WARNING:
Bridge window panels, laminated (heated/unheated). Handle with care.
d)
Details of the method of packaging required will be included in the contract.
4.9.3
Responsibility for Window Panels Not Accepted at Maker’s Works
Where acceptance cannot be made at the works, the contractor will be held responsible for the damage or
breakage up to the inspection and acceptance stage.
4.9.4
Storage
When stored in the original packaging, in any climate, and under reasonable storage conditions, a panel
should remain serviceable for a period of two years from the date of despatch from the manufacture.
5
Design Requirements
5.1
5.1.1
Design Requirements for Bridge Windows
Heated Windows
Electrically heated window glass is to be in accordance with BS ISO 3434.
5.1.2
Unheated Windows
Unheated window glass is to be in accordance with BS ISO 21005.
5.1.3
Winterization Requirements
For environmental conditions windows must meet the requirements of Def Stan 02-102 Part 3 and Def Stan
02-716.
5.1.4
Shock and Vibration Requirements
Windows must comply with the shock and vibration standards as specified in BR 3021 and Def Stan 00-35
Parts 1, 3, 4 and 5.
7
Def Stan 02-112 Issue 3
5.1.5
Navigation Requirements
Bridge windows fixed or hinged must comply with the bridge design requirements as stated in CB 8710.
5.2
Design Requirements for Bridge Window Frames Materials
The materials used in the construction of window frames are to comply with those specified in BS ISO 3434
for heated windows and BS ISO 21005 for non heated windows, for chemical composition and mechanical
properties.
5.3
Manufacture
5.3.1
a)
b)
Construction
Each panel is to be of multi-ply construction, comprising an approved number of toughened float glass
laminated and Polyvinyl Butyral interlayers between which, for heated windows, are laid heating and
temperature sensing elements connected to terminals in a box of approved design. Overall dimensions,
including edge sealant thickness and corner radii, will be in accordance with the contract: contract
drawings: or in special cases, templates supplied. Allowance variations on face dimensions of complete
panels will be:
1)
Face dimensions of width and height shall be the nominal drawing dimensions with a tolerance of
+0.0 mm to +2.0 mm up to 600 mm and +0.0 mm to +3.0 mm over 600 mm;
2)
Corner radii shall be to the nominal drawing dimensions with a tolerance of +0.0 mm to +2.0 mm;
3)
Overall thickness shall be to the nominal drawing dimensions with a tolerance of +0.0 mm to 1.0
mm.
For panel thickness, a variation of ±1.0 mm is acceptable, except that no minus tolerance will be
permitted on corner radii.
5.3.2
5.3.2.1
Glass Laminate
General
a)
Each lamina must be float glass conforming to BS ISO 3434 and DTD 5625, cut to size and shape
edges cut or ground square to the surface and then arrissed before toughening.
b)
For heated windows, the cut-away of the glass edge in the way of the terminal box and recess required
to accommodate the connections from the heating element and sensing elements to the terminal box, is
to extend over a length of approximately 150 mm and to a depth of not more than 4 mm. All corner radii
of the recess are to be 25 mm minimum and the whole contour ground smooth and slightly arrissed at
the edge before toughening. The recess is to be filled in with an approved cure-setting potting
compound.
c)
After toughening, each lamina is to be free from cracks, scratches, bubbles, or other defects which
would adversely affect the optical qualities of the complete panel. Each lamina is to be checked by the
polarised light technique for an acceptable toughening pattern before assembly in a panel.
5.3.2.2
a)
8
Freedom from Defects
Each panel shall be free from defects likely to affect its serviceability such as delamination, peel
splintering, stones, bubbles, broken seeds, scratches, chips, polishing cut, and blockrake. The surfaces
of the carrier panels shall be free of ‘pluck surface’ defects, but such defects are acceptable on the
surfaces of cover panels provided that, when regarded as seed, the total seed is not greater than that
shown in the standard reference panels. The standard reference panels referred to are those quoted in
DTD 218D.
Def Stan 02-112 Issue 3
b)
Ream and seed may be present in each panel to an extent not greater than that shown in the standard
reference panels quoted in DTD 218D. The direction of the ream shall not depart by more than 20° from
the vertical line of sight. When ream is present which is not substantially linear, the test panel at the
mounting angle, shall not show ream more sever than that of the standard panel examined normal to the
surface.
5.3.2.3
a)
Faults inside the Laminate
Critical Area:
1)
This is the area through which bearings, etc., are taken and is the area of glass within the following
dimensions: 40 mm in from top and bottom edges of the glass, 90 mm in from the sides of the
glass;
2)
Individual hairs up to 0.1 mm thick and 13 mm long, or the equivalent area, shall be allowed
providing there are no more than one per square of 300 mm side, and not closer than 300 mm to
each other;
3)
Black or translucent marks:
Category ’A’ = 0.25 mm to 0.75 mm diameter or equivalent area;
Category ’B’ = 0.75 mm to 1.5 mm diameter or equivalent area;
Marks below 0.25 mm shall be ignored unless they cause a haze pattern;
Allow:
i)
One translucent type mark of Category ’B’ and one dark type mark of Category ’A’ per square
of 300 mm sides;
or
ii)
Two translucent type marks of Category ’B’ per square of 300 mm sides providing they are not
closer than 200 mm to each other.
b) Non-Critical Area (The area of glass surrounding the critical area):
1)
Individual hairs up to 0.1 mm thick and 25 mm long or equivalent area, shall be allowed providing
they are not closer than 200 mm to each other;
2)
Black translucent marks:
Category ’C’ = 0.5 mm to 2.0 mm diameter or equivalent area;
Marks of Category ’C’ will be allowed around the non-critical area providing they are not closer than 200
mm to each other. Marks below 0.5 mm diameter shall be ignored unless they cause a haze pattern.
9
Def Stan 02-112 Issue 3
c) Surface Faults:
1)
Critical Area:
Scratch Standard as in
ASTM F.428
Length of one
Scratch
Total Length of all Scratches
per 900 cm2
AMTS number 2
25 mm
50 mm
AMTS number 4
20 mm
20 mm
AMTS number 5
15 mm
15 mm
None nearer than 150 mm to each other;
2)
Non-Critical Area:
Scratch Standard as in
ASTM F.428
Length of one
Scratch
Total Length of all Scratches
per 900 cm2
AMTS number 2
25 mm
100 mm
AMTS number 4
20 mm
100 mm
AMTS number 5
15 mm
50 mm
AMTS number 6
6 mm
25 mm
None nearer than 75 mm to each other;
Support marks on heat treated glasses, within 25 mm from the edge, shall be ignored.
5.3.3
Edge Finishing
Before toughening, all edges of the glass laminae must be ground smooth, arrissed, and all sharp corners
removed.
5.3.4
Vinyl Interlayers
Each interlayer is to be Polyvinyl Butyral plasticized with Triethylene Glycol Di-2-Ethylbutyrate. It should be
free from any defects or impurities which would lower the optical qualities of the completed panel. The
quality of the Polyvinyl Butyral and plasticizer content should be as specified in DTD 5637. A minimum
thickness of 1.5 mm of vinyl should be between each sheet of glass, even if the total assembly consists of
several layers. For general specification no maximum thickness is specified; it is dependent upon in-service
requirements.
5.3.5
Edge Sealing
On laminated glass panels, a sealant approved to DTD 900, must be applied to form a complete seal from
the inner glass face to the outer glass face, in order to prevent the ingress of moisture. The sealant is to be
securely keyed to the edges of the panel and the thickness is not to exceed 2 mm. The sealant is not to be
removed.
10
Def Stan 02-112 Issue 3
5.4
Electrical Requirements
5.4.1
Heating Media Power Supplies and Connections
a)
This equipment is to be suitable for use on 440 V or 115 V, single phase, 60 Hz, or 240 V dc supply.
b)
The connection between the terminal box and the busbars/busbar extensions for connecting the ends of
the heating elements are to be of heat insulating flexible cable from the terminal pillars to the edge of the
glass and from there to the busbars/busbar extensions, copper strip 3.2 mm wide x 0.076 mm thick
approximately, silver plated or tinned. The busbars may be of similar strip or of silver printed on the
glass. No parts of the element or connections between which there is a potential difference exceeding
200 V when energised are to be less than 3.0 mm apart. All connections are to be made by soldering,
welding or crimping.
5.4.2
Electrical Loading
The electrical loading at the rated voltage is to be 1620 (+20% to -5%) W/m2 of heated area. The heating
media is to be sandwiched between the outermost glass and vinyl interlayer. If wires are used, they are to
be connected in parallel or series/parallel and are to be of dull surface finish, spaced and crimped in a
random manner so as to reduce diffraction and reflection effects in both heated and unheated conditions,
and are to be spaced not more than 1 mm apart. If a film heating system is used, it should be series
connected and shall comprise of a neutral coloured metallic oxide laid directly onto the glass. The busbars
shall be 25 mm from the edge of the panel.
5.4.3
Electrical Loading
This is to be within the tolerances stated herein.
WARNING — If a controller is not used the panel should be energised only long enough to settle
down to a steady reading, as there will be no temperature control to prevent enough for the
meters overheating.
5.4.4
Sensing Elements
Sensing elements are to be proved within tolerance stated herein.
5.4.5
Insulation Resistance
Insulation resistance between sensing elements and heating element when measured with a 500 V
insulation tester shall not be less than 2 megaohms.
5.4.6
Makers Certificate
Resistance measurements shall be carried out on every panel and certificate signed on behalf of the maker
is to be included in the terminal box showing the resistance on each sensing circuit and of the heating circuit
measured from the terminals, and corrected to 20°C with the multiplying factors to be applied for
temperatures differing from 20°C with 1°C representing 0.45 ohms.
5.4.7
5.4.7.1
Temperature Sensing Elements
General
Two in number sensing elements (one spare) are to be fitted, to reduce glass rejects due to broken sensors,
manufactures may, if desire, fit a third one during the manufacturing process. The unwanted sensor,
whether working or not, being discarded, and the ends of the elements cut-off close to the edge of the glass
and sealed. Sensing elements are to be sandwiched between the inner face of the vinyl interlay which is
adjacent to the heating media and the adjoining glass. They shall be positioned side-by-side, either with
their centres 127 mm from the top edge of the panel and adjacent to the terminal box or, if opaque, they are
11
Def Stan 02-112 Issue 3
to be sited within the non-critical area at the lower edge of the glass. Connections shall be made in the
same manner as for the heating elements.
5.4.7.2
Electrical Details
The total resistance of each sensing circuit measured from the terminals in the terminal box shall be 100 ±2
ohms at 20°C. The nominal current passing through a sensitive element, when in use, is of the order of 75
milliampers.
5.5
5.5.1
Terminal Box
Securing
A drip-proof terminal box of approved design is to be fitted to the inside surface at the edge of each panel in
a position to be stated in the contract. It is to be secured to the glass by a suitable sealing compound
approved to DTD 900. The thickness of the compound is to be a minimum of 1 mm and is not to exceed 2.5
mm. The efficiency of adhesion is to be tested (with other features of the panel) by subjecting a prototype
panel to the mechanical tests as specified in Clause 4 herein.
5.5.2
Terminals
The terminal box shall contain five terminals. Type 2 to SDN 006 052 126, two for the heater and three for
the sensors (one being common to both sensing elements). Internal connections to the terminal posts shall
be made via soldering tags or crimped terminals and the screw terminals left free for ship cable cores.
5.5.3
Cable Entries
Cable entries for external cables shall be fitted with grommets, two off NATO Stock Number (NSN) 5325-99942-3417 for the single core sensing cables and one off NSN 5325-99-943-6836 for the twin core heating
cables.
5.5.4
Warning Label Plate
The cover of each box shall bear a red plate with the voltage stated in white letters 6.0 mm to 6.4 mm high.
Self adhesive labels shall NOT be used for this purpose.
5.5.5
Makers Label
Each box, NOT THE COVER, shall bear a label showing the name or initials of the window maker, serial
number, the supply voltage and resistance of the heating element at 20°C. The original measured
resistance is required to be permanently marked to enable checks to be made to detect any alteration during
the life of a panel.
5.6
Type Approval Tests
Window panels made by manufactures who have not previously supplied these for Ministry of Defence
(Navy) (MOD(N)) purposes or who wish to introduce design or material changes in those previously
approved shall supply, at their own expense, a prototype panel for evaluation. The following type approval
tests will be carried out by MOD(N).
5.6.1
Cold Camber - Heated Window Only
To operate satisfactorily within a controlled temperature range of +20°C to +40°C when fitted in a standard
frame sited in a test cabinet, the outside of the cabinet being subjected to reducing temperatures down to 40°C with wind speeds up to 45 knots and water spray (fresh and salt) with an approximate content of 3
grams water per cubic metre of air.
12
Def Stan 02-112 Issue 3
5.6.2
Endurance Trials (Heat Cycling) - Heated Window Only
To operate satisfactorily without evidence of deterioration after a continuous heating cycle of 1000 hours
being controlled between temperature range of 20°C to 40°C.
5.6.3
Vibration Test - Heated Window Only
To withstand satisfactorily, being subjected to a vibration test appropriate for equipment fitted in the main
region of a ship, in accordance with Def Stan 00-35 Parts 1, 3, 4 and 5.
5.6.4
Light Transmission
Light transmission factor through the panel shall be 5% as a minimum for a nominal 25.4 mm thick panel.
5.6.4.1
a)
Method for the Determination of Light Transmission Factor (DTD 5625 and DTD 5637)
The determination shall be made in a darkened room, reflections from the walls being avoided by means
of a screen of dull fabric:
1)
A photo cell with spectral responses approximately that of the eye, shall be fixed at one end of a
straight metal bar held rigidly and graduated in centimetres. A tungsten filament lamp (12 V, 12 W
is suitable), operated at a steady voltage, shall be fixed in a suitable stand on the bar at a distance
of approximately 90 cm from the photo cell. The response of the photo cell shall be measured by a
mirror scale galvanometer;
2)
The glass panel shall be placed between the lamp and photo cell, normal to the beam, and
immediately in front of the photo cell. The lamp shall be moved along the bar towards the cell until
the initial intensity is restored, i.e. until the previous deflection on the galvanometer scale is
obtained. The distance the lamp has been moved shall be then measured. The lamp shall be
returned to its original position and the test repeated. The mean of three readings shall be taken;
3)
If x = initial distance of the photo cell from lamp, y = distance through which the lamp has been
moved towards the cell with the glass panel interposed, percentage light transmission through the
panel is equal to
x-y2x100
x2
5.6.5
Optical Tests
These are to be carried out to ensure that there is a clear undistorted vision through the panel, a small
amount of distortion due to the physical nature of laminated glass and the manufacturing process is
acceptable, by day and night both with power ON, and power OFF, with and without binoculars. For the
’night’ test, a point of light source 6.35 mm diameter aperture at a distance of 4.5 m is to be viewed through
the panel in darkened conditions to check for any unacceptable diffraction effects such as multiple images or
spectrum banding. The light source used is to consist of a clear, a red, and a green lens of 6.35 mm
diameter with a 2.5 V, 0.3 amp Miniature Edison Switch (MES) lamp behind each lens. The lens are to be
mounted in holder tubes fixed to the front panel, maximum thickness, 4.6 mm of a light tight box. The top of
the bulb envelope is to be level with the bore of the lens holder tube. The power supply for the lamp is to be
from U2 type cells. The outer surface of the box is to be painted matt black.
5.6.6
Immersion Test
Each panel is to be immersed in a horizontal plane with the upper glass surface under 12 mm of water at
room temperature. The terminal box is to be uppermost. The insulation resistance measured between the
sensing elements and the heating elements and between each of these and an electrode immersed in the
water is not to be less than 2 mega ohms in each case after immersion for one hour.
13
Def Stan 02-112 Issue 3
5.6.7
Gun Blast Test - Windows in Annex C - 25 mm and above only
Whilst mounted in a standard frame secured to suitable structural plating, a25 mm thick panel is to withstand
being subjected to gun blast pressure up to and including 2.1 bar, without signs of damage or deterioration in
electrical performance.
5.6.8
Additional Tests
The tests listed in Clause 4.3 under the heading of ‘Acceptance Tests’.
5.6.9
Repetition of Type Approval Tests
The Inspecting Officer may select a panel or panels from current production and require them to be
subjected to all or any of the tests described in Clause 4.1, Clauses 4.1.1 to 4.9.4 at the MOD(N) expense.
5.6.10
a)
Acceptance Tests
The following tests are to be carried out on each panel as requested by and under the supervision of the
MOD(N) Inspecting Officers:
1)
Visual test for freedom from cracks, unacceptable scratches, bubbles, blisters, air inclusions, haze,
chips, delamination or other visible defects which prevent clear undistorted vision through the panel
for both day and night viewing. When checking for any type of distortion in the window, the window
should be viewed from a distance of not less than 3 m, and from a height which ensures viewing
through the critical region of the window. The critical region is defined in Clause 5.3.2.3a. For
windows produced using the horizontal toughening process, the angle from the normal can be
increased to 80 degrees without distortion occurring. This distortion is a result of the horizontal,
glass toughening process and as such is acceptable;
NOTE MOD(N) Inspecting Officer is to be advised that the windows have been produced by the horizontal
toughening process. In addition this information is to be advised to the respective Refit Project Officer (RPO).
2)
5.6.11
Check for correct face dimensions, thickness, and corner radius, and position of terminal box.
Approval
Failure of a panel or panels to meet the specified test will result in the rejection of the panel or panels at the
manufacture’s own expense.
5.6.12
Technical Questions
Technical questions regarding “doubtful” panels may be referred to the MOD(N), MXS IPT/MCH RCW.
14
Def Stan 02-112 Issue 3
Annex A
Abbreviations and Definitions
For the purpose of this Def Stan the following abbreviations apply:
ASTM
American Society for Testing and Materials
BR
Book of Reference
BS
British Standard
CASE
Chief Above Water System Executive
CB
Confidential Book
COSHH
Control of Substances Hazardous to Health
DEF STAN
Defence Standard
DERA(H)
Defence Evaluation and Research Agency (Haslar)
DLO
Defence Logistics Organisation
DME
Director Marine Engineering
DPA
Defence Procurement Agency
DSLE
Director Ships Logistics Engineering
DTD
Director of Technical Documentation
ISO
International Standard Organisation
ME
Marine Engineering
JSP
Joint Service Publication
MES
Miniature Edison Screw
MOD
Ministry of Defence
MOD(N)
Ministry of Defence (Navy)
MOD(PE)
Ministry of Defence (Procurement Executive)
NATO
North Atlantic Treaty Organisation
NES
Naval Engineering Standard
NSN
NATO Stock Number
PVC
Polyvinyl Chloride
QAWT
Quick Acting Watertight
RPO
Refit Project Officer
SDN
Service Drawing Number
SSA
Ship Support Agency
WSA
Warship Support Agency
VCS
Versatile Console System
There are no definitions within this Def Stan.
15
Def Stan 02-112 Issue 3
Annex B
Procurement Check List
NOTE 1. This Check List is to ensure that certain aspects of this Naval Engineering Standard are consulted
when preparing a procurement specification for a particular application.
NOTE 2
Clauses where a preference for an option is to be used or where specific data are to be added are
included in the Check List.
NOTE 3
Each item is to be marked either:
9 = included
NA = not applicable
Check No.
1
Check
Clause No.
Window Wipers:
Types
16
Fitting Policy
4.3.2
Glass Screens
4.8a
9 or NA
953-4334
923-4337
520-3947
520-3948
2
3
4
A
NSN 2040-99-
1
Item
Number
0427
0427
0427
0427
B
406 mm
582 mm
597 mm
1054 mm
D
Width
330 mm
532 mm
597 mm
597 mm
E
Height
16 mm
25 mm
25.4 mm
25.4 mm
F
Normal
Thickness
Dimensions
51 mm
37 mm
44 mm
44 mm
G
Corner
Radius
3
3
3
3
H
Number of
Laminations
Table C.1 — Window Panel Ships, Laminated (Unheated)
Window
Panel,
Ships
(Laminated
and
Unheated
C
Navy
Item Name
Management
Code
BS ISO 21005
J
Standard or
Specification
for Glass
Glass panels,
unheated, for bridge
windows. Flat,
toughened,
uncoloured
K
Description
Def Stan 02-112 Issue 3
Annex C
Window Procurement List - Unheated and Heated
17
B
0427
0427
0427
0427
0427
0427
0427
0427
0427
0427
0427
0427
0427
A
923-4323
923-4324
923-4325
923-4326
923-4327
923-4328
923-4330
923-4331
520-3939
520-3940
520-3941
522-7525
521-3173
1
2
3
4
5
6
7
8
9
10
11
12
13
Item
Number
Navy
Management
Code
NSN 2040-99-
18
1057 mm
1048 mm
584 mm
914 mm
1016 mm
914 mm
1067 mm
1067 mm
660 mm
597 mm
749 mm
902 mm
1054 mm
D
Width
600 mm
590 mm
610 mm
610 mm
610 mm
610 mm
610 mm
610 mm
508 mm
597 mm
597 mm
597 mm
597 mm
E
Height
25 mm
25 mm
25 mm
25 mm
25 mm
25 mm
25 mm
25 mm
25 mm
25 mm
25 mm
25 mm
25 mm
F
Normal
Thickness
Dimensions
117 mm
101 mm
51 mm
51 mm
31 mm
121 mm
121 mm
51 mm
44 mm
44 mm
44 mm
44 mm
44 mm
G
Corner
Radius
3
3
3
3
3
3
3
3
3
3
3
3
3
H
Number of
Laminations
Table C.2 — Window Panel Ships, Laminated (Heated)
Ships (Heated)
Window Panel
C
Item Name
Panels heated, for bridge
windows, Flat, toughened,
non-coloured glass laminated
to the specification shown
within this standard. Corner
angle 90° with terminal block
positioned top centre of the
width of panel, 440 V single
phase.
K
Description
Panels heated, for bridge
windows, Flat, toughened,
non-coloured glass laminated
to the specification shown
within this standard. Corner
angle 90° with terminal block
positioned top centre of the
width of panel, 115 V single
phase.
Panels heated, for bridge
BS ISO 3434 windows, Flat, toughened,
non-coloured glass laminated
to the specification shown
within this standard. Corner
angle 90° with terminal block
positioned top centre of the
width of panel, 220 V dc.
J
Standard or
Specification
for Glass
Def Stan 02-112 Issue 3
Inside Rear Cover
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