1、BRITISH STANDARD MARINE SERIES CONFIRMED JANUARY 1980 BS MA 18:1973 Incorporating Amendment No.1 Specification for Salt water piping systems in ships UDC 629.12.061:621.64/.69BSMA18:1973 This BritishStandard, having been approved by the Ship building for continuous flow 32 Figure 2 Swept saddle type
2、 branch, welded; continuous, intermittent and no-flow 33 Figure 3 Saddle branch, welded; continuous, intermittent and no-flow 33 Figure 4 Welded stub branch; continuous, intermittent and no-flow 34 Figure 5 Set-on branch pipes for2.5mm wall thickness and above; intermittent and no-flow 34 Figure 6 S
3、et-on branches and bosses, welded; no-flow 35 Figure 7 Swept saddle type branch, brazed; continuous, intermittent and no-flow 36 Figure 8 Saddle branch, brazed; continuous, intermittent and no-flow 36 Figure 9 Set-on boss, brazed; no-flow 37 Figure 10 Set-in socket boss (Scotch type); no-flow 37 Fig
4、ure 11a Cast bulkhead pieces 38 Figure 11b Fabricated copper alloy/steel bulkhead pieces 39 Figure 11c Fabricated copper alloy/steel bulkhead pieces. Methods of attaching components of types shown in Figure 11b 40 Figure 11d Galvanized fabricated steel bulkhead pieces 41 Figure 11e Grey and ductile
5、iron bulkhead pieces 42 Figure 12 Recommended steel flange preparation for welding to copper-nickel pipe 43 Figure 13 Typical procedure for welding steel flange to copper-nickel pipe 43 Figure 14 Gussetted bend 44 Figure 15 Setting up correct flows in salt water circulating systems 44 Figure 16 Pipe
6、 friction coefficient 45 Figure 17 Friction loss in “smooth” (copper alloy) pipes (water20 C) 46 Figure 18 Temperature correction factor for loss in “smooth” (copper alloy) pipes 47 Figure 19 Friction loss in new steel pipes (water20 C) 48 Figure 20 Temperature correction factor for loss in new stee
7、l pipes 49 Figure 21 Dynamic pressure of salt water 50 Figure 22 Excess loss coefficients for bends 51 Figure 23 Loss coefficient for flow in a45 branch (dividingflow0.352u da/d u 1.00) 52 Figure 24 Loss coefficient for flow in a45 branch (uniting flow0.352u da/d u 1.00) 53 Figure 25 Loss coefficien
8、t for flow in equi-diameter right-angle branches 54 Figure 26 Loss coefficient for sudden enlargement and contraction 55 Figure 27 Loss coefficient for valves 56 Figure 28 Comparison of pump and system characteristics 57 Figure 29 Vapour pressure of water 58 Figure 30 Typical sea water circulating s
9、ystem 59 Figure 31 Isometric view of piping layout (for Appendix A example calculation only) 60 Table 1 Copper alloy components 3 Table 2 Preferred sizes for salt water pipelines 8BSMA18:1973 BSI 05-2000 iii Page Table 3 Arc welding processes 11 Table 4 Filler metals for arc welding copper alloy pip
10、elines 15 Table 5 Steel pipe sizes 16 Table 6 Dimensions of grey and ductile iron pipes 17 Table 7 Recommended minimum bending radii for steel pipes 18 Table 8 Filler metals and electrodes; steel 18 Table 9 The galvanic series in sea water 30BSMA18:1973 iv BSI 05-2000 Foreword This BritishStandard h
11、as been prepared under the authority of the Shipbuilding and Marine Industry Standards Committee. Recommendations and requirements are given in this standard with the object of improving the service life of salt water systems in ships. Failure of the component parts of salt water piping systems may
12、occur as a result of corrosion/erosion, otherwise known as impingement attack, arising from excessive turbulence. Such a condition may be brought about by poor design and/or poor workmanship, or the use of too high a nominal water speed. Excessive water speed is a major factor and may arise as a res
13、ult of poor design or of misuse of the system. Failure may also occur by pitting resulting from deposit attack, and cracking due to stress corrosion, or by general wastage in the case of ferrous systems. Attention should therefore be given to the design, fabrication and installation of systems to en
14、sure minimum turbulence. In particular, abrupt changes in the direction of flow, mismatched pipe bores, tube bore protrusions and other restrictions of flow should be avoided. All pressures in this standard are in bar 1)(gauge) unless otherwise stated. This standard makes reference to the following
15、BritishStandards: BS309, Whiteheart malleable iron castings. BS310, Blackheart malleable iron castings. BS449, Welding terms and symbols. BS639, Covered electrodes for the manual metal-arc welding of mild steel and medium-tensile steel. BS729, Hot dip galvanized coatings on iron and steel articles.
16、BS864, Capillary and compression fittings of copper and copper alloy for use with copper tube complying with BS1386 and BS3931Part2:Metric units. BS970, Wrought steels in the form of blooms, billets, bars and forgings. Part1: Carbon steels 1) ; Part2: Direct hardening alloy steels including alloy st
17、eels capable of surface hardening by nitriding; Part3: Steels for case hardening; Part4: Stainless, heat resisting and valve steels; Part5: Carbon and alloy spring steels for the manufacture of hot formed springs. BS1387, Steel tubes and tubulars suitable for screwing to BS21 pipe threads. BS1400, C
18、opper alloy ingots and copper and copper alloy castings. BS1452, Grey iron castings. BS1453, Filler rods and wires for gas welding. BS1504-6, Steels for use in the chemical, petroleum and allied industries. BS1504, Castings. BS1560, Steel pipes flanges, nominal size “ in to24in, for the petroleum in
19、dustry Part 2:Metric dimensions. BS1640, Steel butt-welding pipe fittings for the petroleum industry Part3:Wrought carbon and ferritic alloy steel fittings. BS1723, Brazing. BS1740, Wrought steel pipe fittings (screwed BSP thread). BS1845, Filler metals for brazing. BS1965, Butt-welding pipe fitting
20、s for pressure purposes Part 1: Carbon steel. 1) In course of preparationBSMA18:1973 BSI 05-2000 v BS1973, Polythene pipe (Type32) for general purposes, including chemical and food industry uses. BS2051, Tube and pipe fittings for engineering purposes Part 1:Copper and copper alloy capillary and com
21、pression tube fittings (for use with fractional o.d. sizes of tubes). BS2579, Solid drawn copper alloy tubes for the manufacture of screwed ferrules, and copper alloy screwed ferrules for condenser, evaporator, heater and cooler tubes. BS2591, Glossary for valves and valve parts (for fluids). Part 1
22、: Screw-down stop, check and gate valves; Part 2: Safety valves and relief valves; Part 3: Plug valves and cocks; Part 4: Butterfly valves; Part 5: Ball valves. BS2640, Class II oxy-acetylene welding of steel pipelines and pipe assemblies for carrying fluids. BS2789, Iron castings with spheroidal or
23、 nodular graphite. BS2815, Compressed asbestos fibre jointing. BS2870, Rolled copper and copper alloys. Sheet, strip and foil. BS2871, Copper and copper alloys. Tube. Part 1: Copper tubes for water, gas and sanitation; Part 2: Tubes for general purposes. BS2872, Copper and copper alloys. Forging sto
24、ck and forgings. BS2873, Copper and copper alloys. Wire. BS2874, Copper and copper alloys. Rods and sections (other than forging stock). BS2875, Copper and copper alloys. Plate. BS2901, Filler rods and wires for gas-shielded arc welding. BS2971, Class II metal-arc welding of steel pipelines and pipe
25、 assemblies for carrying fluids. BS3071, Nickel-copper ahoy castings. BS3072, Nickel and nickel alloys. Sheet and plate. BS3075, Nickel and nickel alloys. Wire. BS3076, Nickel and nickel alloys. Rods. BS3100, Steel castings for general engineering purposes. BS3468, Austenitic cast iron. BS3600, Dime
26、nsions and masses per unit length of welded and seamless steel pipes and tubes for pressure purposes. BS3601, Steel pipes and tubes for pressure purposes: carbon steel with specified room temperature properties. BS3974, Pipe supports. BS4368, Carbon and stainless steel compression couplings for tube
27、s. BS4504, Flanges and bolting for pipes, valves and fittings. Metric series. BS4622, Grey iron pipes and fittings. BS4772, Ductile iron pipes and fittings. BS4882, Bolting for flanges and pressure containing purposes. BSMA26, Weed boxes and suction strainers. CP3003, Lining of vessels and equipment
28、 for chemical processes. Part 1: Rubber;BSMA18:1973 vi BSI 05-2000 Part 2: Glass enamel; Part 3: Lead; Part 4: Plasticized PVC sheet; Part 5: Epoxide resins; Part 6: Phenolic resins. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards
29、 are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi tovi, pages1to60, an inside back cover and a back cover. This standard h
30、as been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BSMA18:1973 BSI 05-2000 1 1 Scope This BritishStandard specifies requirements for the materials, design, fabrication, installation, inspection and te
31、sting of salt water piping systems in ships, including all fittings which form parts of such systems, in which the design pressure in the pipes does not exceed16 bar 2) . For the purposes of this standard a salt water piping system includes all pipes and fittings from sea water inlet to discharge ov
32、erboard. NOTEUsers of this standard 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 concerned. 2 Definitions For the purposes of this B
33、ritishStandard the following definitions, together with those given in BS499 and BS2591, apply: 2.1 design pressure the maximum pressure to which the system can be subjected when in service. It is the value used in design calculations. This pressure may result from a combination of circumstances unl
34、ikely to occur under the normal working conditions, e.g.ship at its deep draught, discharge valves fully shut, pumps operating and relief valves set for normal working conditions 2.2 test pressure the pressure to which the system and its components are subjected under test conditions (seeClause10) 2
35、.3 the piping system all pipes, pumps, valves, heat exchangers and fittings from sea water inlet to discharge overboard 2.4 Flow conditions The expected conditions of water flow in individual parts or sections of the piping system. To meet varying design requirements three conditions are recognized:
36、 2.4.1 continuous flow where the water in a system or part of a system is flowing continuously under the ships normal operating conditions 2.4.2 no-flow for air vents, and where a branch connection to a main pipe has its other end permanently closed under normal operating conditions. The water in su
37、ch a branch is regarded as having a no-flow condition 2.4.3 intermittent flow all systems and parts of the systems not covered by2.4.1 and 2.4.2 2.5 purchaser the shipowner or ship operator according to the circumstances of a particular ship 2.6 manufacturer the shipbuilder or authorized subcontract
38、or 3 Rating of system The design pressure rating of the system shall be not greater than16 bar 2) . 4 Materials 4.1 General. Materials used in the piping systems constructed in accordance with this BritishStandard shall comply with one of the material standards given in4.2 and4.3. The materials in t
39、his standard are not listed in order of preference and the use of other materials shall be by agreement of the manufacturer and the purchaser. 4.2 Copper alloy components. All copper alloys used in the manufacture of components for salt water piping systems shall comply with the requirements of one
40、of the BritishStandards or designated alloys given in Table 1. Attention is drawn to the unnumbered footnote immediately under Table 1 and also to Appendix B. 4.3 Ferrous components (steel and cast iron). The component is described as “ferrous” if it is entirely ferrous or its main body is made of f
41、errous material. The materials used for ferrous components shall comply with the following specifications. 4.3.1 Pipes 4.3.1.1 Steel pipes as specified in BS1387. Steel pipes complying with the requirements of BS1387 are limited to a maximum working pressure of3.5bar 3)on piping systems subject to s
42、urvey by regulatory bodies. On systems not subject to survey, higher pressures are permissible. 2) 1 bar=10 5N/m 2 =0.1 MPaBSMA18:1973 2 BSI 05-2000 4.3.1.1.1 BS3601. Seamless (S) or electric resistance welded (ERW) steel pipes of Grades320,360 and410. Submerged arc welded (SAW) steel pipes, Grade41
43、0, provided they are welded internally and externally. 4.3.1.1.2 General. Steel pipes may also be fabricated from “ship quality” mild steel plate. Pipes which are to be used with screwed fittings may be purchased in the galvanized condition. Allother steel pipes shall be ordered in the black unvarni
44、shed condition. 4.3.1.2 Grey and ductile iron pipes. Grey and ductile iron pipes shall be as specified in BS4622 or BS4772. 4.3.2 Pipe fittings, flanges and bolting 4.3.2.1 Steel. Carbon steel butt-welding pipe fittings shall be as specified in BS1965-1 (for nominal sizes up to and including400mm).
45、Wrought carbon steel butt-welding pipe fittings (metric units) shall be as specified in BS1640-3 (fornominal sizes over400mm). Steel flanges and bolting for pipes, valves and fittings (metric series) shall be as specified in BS4504 or BS1560-2. Steel flanges may also be made according to BS4504 but
46、of “ship quality” mild steel plate. 4.3.2.2 Wrought steel. Steel plates, sheets, strips and forgings shall be of low carbon welding quality so that no preheating or other special precautions are required. NOTEWith regard to friction welding of flanges see7.3.1.1. 4.3.2.3 Cast steel. Carbon steel cas
47、tings shall be as specified in BS3100-592, Grade “A”. BS1504-161, Grade “A”. 4.3.2.4 Grey and ductile iron. Grey and ductile iron shall comply with the requirements of the following standards as applicable: BS1452, Grade12 minimum. BS2789, Grade SNG24/17 or27/12. BS3468, AUS101 flake graphite austen
48、itic cast iron. BS3468, AUS202 spheroidal or nodular graphite austenitic cast iron. BS309, Whiteheart malleable iron castings. BS310, Blackheart malleable iron castings. BS4772, Ductile iron pipes and fittings. BS4622, Grey iron pipes and fittings. 4.3.3 Couplings. Screwed couplings shall be as spec
49、ified in BS1740-1 and compression couplings as specified in BS4368-1, BS4368-2 4)and BS4368-3 5) . Where proprietary designs of couplings, which prevent leakage by axial or radial compression of non-metallic sealing rings, are used to connect pipes the materials shall be subject to agreement between the manufacturer and the purchaser. 4.3.4 Valves 4.3.4.1 Body, bonnet, cover, disc (according to type of valve). Any of the materials given in4.3.2.2, 4.3.
