1、BRITISH STANDARD MARINE SERIES BS MA 25:1973 Incorporating Amendment No.1 Specification for Ships windows UDC 629.12.011.83BSMA25:1973 This BritishStandard, having been approved by the Shipbuildingand Marine IndustryStandards Committee, was published under the authorityof the Executive Boardon 29Oct
2、ober1973 BSI02-2000 The following BSI references relate to the work on this standard: Committee reference SME/7 Draft for comment71/32821 ISBN 0 580 07986 4 Amendments issued since publication Amd. No. Date of issue Comments 2060 July1976 Indicated by a sideline in the marginBSMA25:1973 BSI 02-2000
3、i Contents Page Foreword iii 1 General 1 1.1 Scope 1 1.2 Definitions 1 1.3 Conformity with law or regulation 2 2 Materials 2 2.1 General 2 2.2 Schedule of materials 3 3 Glasses for ships windows 3 3.1 General 3 3.2 Dimensions of toughened safety glasses 3 3.3 Examination and testing of toughened gla
4、sses 5 3.4 Marking 6 4 Dimensions and tolerances for ships windows 7 5 Design and construction 10 5.1 General 10 5.2 Windows for sea-going ships 10 5.3 Windows for ships in sheltered or inland waters 10 5.4 Hinge pins and window fasteners 11 6 Glazing 11 6.1 General 11 6.2 Wheelhouse windows 12 6.3
5、Glazing strips, glazing screws and fixing bolts 12 7 Installation and testing 12 7.1 Installation 12 7.2 Testing 13 7.3 Inspection 13 7.4 Testing facilities 13 8 Identification 13 Appendix A Examination of toughened safety glass using polarized light 14 Appendix B Suitable apparatus for load stamp t
6、est of toughened safety glass 15 Appendix C Timber for ships window frames 15 Appendix D Windows for ships operating in sheltered waters 16 Appendix E Method for calculating the thickness of toughened safety glass usingdesign pressure head formulae 16 Figure 1 Edge of the glass 5 Figure 2 Rectangula
7、r windows 7 Figure 3 Category1 and Category2 windows 9 Figure 4 Profile showing tiers, datum deck and weather deck 9 Figure 5 Polariscope for examining for standard of toughening of glass 14 Figure 6 Apparatus for load stamp test of toughened glass 15 Figure 7 Curve for determination of factor based
8、 on window size ratio 18 Table 2 Tolerance on thickness of glass 4 Table 3 Tolerance on flatness and parallelism of glass 4 Table 4 Dimensions of arris for edge of glasses 4 Table 5 Proof loading for load stamp test 5 Table 6 Dimensions of ships windows 8 Table 7 Dimensions and number of window hing
9、e pins and fasteners 11BSMA25:1973 ii BSI 02-2000 Page Table 8 Glazing dimensions for wheelhouse windows 12 Table 9 Dimensions for glazing strips, glazing screws and fixing bolts 12 Table 10 Maximum allowable pressure head on toughened safety glass forstandard sizes of ships windows 17BSMA25:1973 BS
10、I 02-2000 iii Foreword This BritishStandard has been prepared under the authority of the Shipbuilding and Marine Industry Standards Committee and provides requirements for the design (including dimensions), construction, glazing, testing and installation of ships windows. The standard is based on th
11、e experience of glass and window manufacturers and shipbuilders, and of Authorities who apply to ships the provisions of the International Convention for the Safety of Life at Sea,(1960) and of the International Convention respecting Load Lines,(1930 and1966) and follows the standard being prepared
12、by Technical Committee ISO/TC8 Shipbuilding, of the International Organisation for Standardization (ISO). Consideration has also been given to the safety of passengers and crew and also to the safety of the ship, having regard to the safety convention and load line convention, both of which require
13、that openings in ships hulls and ships superstructure shall be efficiently protected. The design and scantlings of ships windows in this standard will normally be applicable to ships engaged on sea voyages, but in the case of ships on restricted services such modifications of this standard as appear
14、s reasonable may be allowed, having regard to the services of these ships. The dimensions of ships windows specified have been adopted from the futureISO standard being prepared by the Technical Committee ISO/TC8 Shipbuilding, of the International Organisation for Standardization, (in which the Unit
15、ed Kingdom has taken an active part), to facilitate the repair of ships windows. The standard also includes requirements for the testing of glasses for ships windows, based on ISO614. Details of the apparatus to be used for the testing of glasses is given in the Appendices. The requirements of this
16、BritishStandard appertaining to toughened safety glasses for ships windows supersede those specified in BS3925:1965, which will accordingly be withdrawn. It is not the purpose of this standard to specify precautions, such as the provision of shutters, that may have to be taken in certain weather con
17、ditions for the protection of glasses in ships windows. A further related standard in this Marine Series is BS MA, Specification for side scuttles for ships, (revision of BS3024), in course of preparation. This standard makes reference to the following BritishStandards: BS309, Whiteheart malleable i
18、ron castings. BS310, Blackheart malleable iron castings. BS952, Classification of glass for glazing and terminology for work on glass. BS970, Wrought steels in the form of blooms, billets, bars and forgings. BS1400, Copper alloy ingots and copper and copper alloy castings. BS1490, Aluminium and alum
19、inium alloy ingots and castings. BS1631, See BS3100. BS1632, See BS3100. BS2872, Copper and copper alloys. Forging stock and forgings. BS2874, Copper and copper alloys. Rods and sections (other than forging stock). BS3100, Steel castings for general engineering purposes. BS1631, Austenitic chromium-
20、nickel steel castings for resistance to corrosion. BS1632, Austenitic chromium-nickel-molybdenum steel castings for resistance to corrosion. BS3643, ISO metric screw threads Part1 Thread data and standard threadseries Part2 Limits and tolerances for coarse pitch seriesthreads. BS4360, Weldable struc
21、tural steels. BSMA25:1973 iv BSI 02-2000 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
22、Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1to18, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside fro
23、nt cover.BSMA25:1973 BSI 02-2000 1 NOTE 1Users of this BritishStandard: Marine Series should note that while observing the requirements of the Standard they should at the same time ensure compliance with such statutory requirements, rules and regulations as may be applicable to the individual ship c
24、oncerned. (See also1.3) NOTE 2Attention is drawn to the fact that some ships windows are subject to letters patent. 1 General 1.1 Scope This BritishStandard specifies requirements for the design (including dimensions), construction, scantlings, glazing, testing and installation of non-opening and op
25、ening type windows for ships. It also specifies the thicknesses of toughened safety glasses for ships windows located in the respective tier positions in both passenger and non-passenger ships. 1.2 Definitions For the purposes of this BritishStandard the following definitions apply. 1.2.1 passenger
26、ship a ship carrying more than12passengers 1.2.2 bulkhead deck the uppermost deck to which the transverse watertight bulkheads extend. Where used herein refers to passenger ships only 1.2.3 datum deck the freeboard deck in a non-passenger ship and the bulkhead deck or freeboard deck whichever is the
27、 higher in a passenger ship 1.2.4 freeboard deck the deck from which the freeboards assigned to the ship are calculated, being either: 1) the uppermost complete deck exposed to weather and sea which has permanent means of closing all openings in its weather portions and below which all openings in t
28、he sides of the ship are fitted with means of watertight closing, or 2) at the request of the owner and subject to the approval of the Department of Trade and Industry, a deck lower than that described in1.2.4 1) which may be permitted subject to its being a complete and permanent deck that is conti
29、nuous both firstly, in a fore and aft direction at least between the machinery space and the peak bulkheads of the ship, and secondly, athwartships. In a ship having a discontinuous freeboard deck the lower line of the exposed deck and the continuation of that line parallel to the upper part of the
30、deck is taken as the freeboard deck. 1.2.5 superstructure a decked structure on the freeboard deck which entitles the ship to a reduction in freeboard. Deckhouses whose sides are within1.5m from the ships side are, for the purpose of this Standard, treated as a superstructure without regard to allow
31、ance for freeboard 1.2.6 tiers spaces above the higher of the bulkhead deck or freeboard deck in passenger ships or the freeboard deck in non-passenger shipsBSMA25:1973 2 BSI 02-2000 1.2.7 safety glass (General definition.) a glass which, if fractured, gives fragments which are less liable to cause
32、severe cuts than fragments ofordinary glass 1.2.8 toughened safety glass glass which has been converted to safety glass by subjection to a process of heating and rapid cooling so that if fractured it disintegrates into small pieces and, in addition, its liability to fracture under the action of exte
33、rnal forces or changes of temperature is greatly reduced 1.2.9 laminated toughened safety glass a product consisting of two or more pieces of toughened safety glass firmly united to and alternating with one or more pieces of reinforcing material known as “interlayer” or “interleaf”. The adhesion sho
34、uld be such that fracture will not cause the glass to separate from the interlayer to any substantial extent and that the glass will not break into large fragments capable of causing severe injury 1.2.10 batch a quantity of glasses of the same size and thickness and which show a similar strain patte
35、rn when viewed by polarized light 1.3 Conformity with law or regulation The purchaser shall disclose to the supplier at the time of the inquiry any statutory or other regulations with which the windows are intended to comply. Windows fitted in all British merchant ships have to satisfy the requireme
36、nts of: 1) The Merchant Shipping (Passenger Ship Construction) Rules1965 (Statutory Instrument1965, No.1103). 2) The Merchant Shipping (Cargo Ship Construction and Survey) Rules1965 (Statutory Instrument1965, No.1104). NOTEFor passenger vessels registered in the United Kingdom the windows are requir
37、ed to be constructed to the satisfaction of amarine surveyor of the Department of Trade and Industry. 2 Materials 2.1 General The materials used in the construction of window scantlings to this standard shall comply with those specified in2.2 as regards chemical composition and mechanical properties
38、, as a minimum requirement. The mechanical testing of all materials specified in2.2 shall be carried out in accordance with the mechanical test requirements of the appropriate BritishStandard listed in the schedule.BSMA25:1973 BSI 02-2000 3 2.2 Schedule of materials 3 Glasses for ships windows 3.1 G
39、eneral Glasses for ships windows shall be in toughened safety glass. The glass shall comply with the requirements of BS952. 3.2 Dimensions of toughened safety glasses 3.2.1 Thickness of glasses. The thickness of glasses for ships windows, according to the nominal window dimension and location of the
40、 tier, shall be calculated from the formula given in Appendix E, which takes into account the ships length, breadth, freeboard, block coefficient and breadth of deck houses. 3.2.1.1 When obscured glass is fixed with the obscured surface facing inwards, one thickness greater than that calculated shal
41、l be used. 3.2.1.2 When obscured glasses are used with the obscured surface on the outside, the calculated thickness is acceptable, providing the depth of sandblast treatment does not exceed0.125mm. It is preferable that the obscuring treatment should be applied before the glass is toughened. Types
42、Brass Aluminium alloys Gunmetal Malleable cast iron Steel Sand castings BS1400 (SCB3C) BS2874 (CZ121) BS1490 LM5 LM6 LM25 BS1400 LG2 LG4 BS310 Grade2 BS309 Grade1 Die castings BS1400 (DCB1) Castings (by other methods) Carbon-steel BS3100 Material BS592 Grade A Plate BS4360-2 Grade 43A Extrusions BS2
43、874 (CZ123) BS1474 NE4 NE5 NE8 HE9 HE30 Naval die castings BS1400 (DCB1) (DCB3) Wrought corrosion resistant BS970 321S12 34S17 316S16 Cast corrosion resistant BS1631 BS1632BSMA25:1973 4 BSI 02-2000 3.2.1.3 Where windows of the2nd tier and tiers above are situated in positions at a distance of at lea
44、st4% of the breadth of the ship from the ships side or1.5m whichever is the greater, or positioned behind screens, the glass may be reduced by one thickness. 3.2.2 Tolerance on thickness. The tolerance on thickness shall be according to the values given in Table 2. Table 2 Tolerance on thickness of
45、glass 3.2.3 Tolerance on flatness and parallelism of glass thickness. The tolerance on flatness and parallelism of glasses shall be as specified in Table 3. Table 3 Tolerance on flatness and parallelism of glass 3.2.4 Edges of toughened safety glasses. All edges shall be arrissed and finished to rem
46、ove sharpness and roughness. Edges of glasses of nominal thickness over12mm should be ground flat and arrissed or finished by some other such process providing that the finished dimension conforms to the dimensional tolerances specified in Table 6. The width (s) and depth (y) of the arris should not
47、 exceed the dimensions inTable 4. The arrissing should be carried out before toughening the glass. Table 4 Dimensions of arris for edge of glasses Nominal thickness of glass Tolerance mm 10 12 15 19 25 mm 0.3 0.3 0.5 1.0 1.0 Nominal thickness of glass (t) mm 10,12,15,19,25 Tolerance on parallelism(p
48、) (mm/1000mm) 0.2 Tolerance on flatness(f) (mm/1000mm) 2.0 Nominal thickness ofglass, t Maximum width, s Minimum depth, y mm mm mm 10 12 15 19 25 1.4 2.0 1.0 1.4 BSMA25:1973 BSI 02-2000 5 3.3 Examination and testing of toughened glasses 3.3.1 Examination in polarized light. Each glass shall be illum
49、inated by plane polarized light falling approximately normally on one face and examined from the opposite side through the analyzing device. To ensure that the glass is properly toughened, the whole area of each glass shall be examined. A suitable apparatus is described in Appendix A. During this examination, the glasses shall be sorted into batches of similar strain pattern, for subjection to the strength test, if required, as specified in3.3.2. 3.3.2 Strength test. Manufacturers s
