BS MA 18:1973

Foreword
SPECIFICATION
1. Scope
2. Definitions
3. Rating of system
4. Materials
4.1 General
4.2 Copper alloy components
4.3 Ferrous components (steel and cast iron)
4.4 Welding and brazing consumables
4.5 Non-metallic components
5. Design of salt water pipeline systems
5.1 General
5.2 Recommended water speeds
5.3 Venting of systems
5.4 Piping layout
6. Copper alloy systems
6.1 Pipes, flanges, bolting and fittings
6.2 Manipulation and fabrication of copper alloy pipes
6.3 Permanent joining
6.4 Bulkhead pieces
6.5 Weed grids and strainers
7. Ferrous systems
7.1 Pipes, flanges, bolting and fittings
7.2 Manipulation and fabrication of steel pipes
7.3 Permanent joining
7.4 Bulkhead pieces
7.5 Weed grids and strainers
7.6 Protective coatings for service
8. Mixed ferrous and copper alloy systems
9. Pipework flexibility, support and installation
9.1 Flexibility of piping systems
9.2 Flexible piping units or assemblies
9.3 Pipe supports
9.4 Piping installation
10. Inspection and testing
10.1 Component inspections and tests before installation
10.2 System inspections and tests after installation
10.3 Sea trials
APPENDICES
A. Pressure losses
A.1 Losses in pipes, bends, fittings and valves
A.2 Flow in parallel branches
A.3 Total system loss and pump selection
A.4 Example calculation
B. Measures to minimize corrosion in salt water
      systems
B.1 General
B.2 Protective film formation
B.3 Dissimilar metals in contact
B.4 Electrical leakage currents
C. Conversion of sea water pressure units
TABLES
1. Copper alloy components
2. Preferred sizes for salt water pipelines
3. Arc welding processes
4. Filler metals for arc welding copper alloy pipelines
5. Steel pipe sizes
6. Dimensions of grey and ductile iron pipes
7. Recommended minimum bending radii for steel pipes
8. Filler metals and electrodes; steel
9. The galvanic series in sea water
FIGURES
1. Salt water velocities in pipes; for continuous flow
2. Swept saddle type branch, welded; continuous,
      intermittent and no-flow
3. Saddle branch, welded; continuous, intermittent
      and no flow
4. Welded stub branch; continuous, intermittent and
      no-flow
5. Set-on branch pipes for 2.5 mm wall thickness and
      above; intermittent and no-flow
6. Set-on branches and bosses, welded; no-flow
7. Swept saddle type branch, brazed; continuous,
      intermittent and no-flow
8. Saddle branch, brazed; continuous, intermittent and
      no-flow
9. Set-on boss, brazed; no-flow
10. Set-in socket boss (Scotch type); no-flow
11a. Cast bulkhead pieces
11b. Fabricated copper alloy/steel bulkhead pieces
11c. Fabricated copper alloy/steel bulkhead pieces.
      Methods of attaching components of types shown in
      Fig. 11b
11d. Galvanized fabricated steel bulkhead pieces
11e. Grey and ductile iron bulkhead pieces
12. Recommended steel flange preparation for welding
      to copper-nickel pipe
13. Typical procedure for welding steel flange to
      copper-nickel pipe
14. Gussetted bend
15. Setting up correct flows in salt water circulating
      systems
16. Pipe friction coefficient
17. Friction loss in 'smooth' (copper alloy) pipes
      (water 20 deg C)
18. Temperature correction factor for loss in 'smooth'
      (copper alloy) pipes
19. Friction loss in new steel pipes (water 20 deg C)
20. Temperature correction factor for loss in new steel
      pipes
21. Dynamic pressure of salt water
22. Excess loss coefficients for bends
23. Loss coefficient for flow in a 45 deg branch
      (dividing flow 0.352 24. Loss coefficient for flow in a 45 deg branch
      (uniting flow 0.352 25. Loss coefficient for flow in equi-diameter right-
      angle branches
26. Loss coefficient for sudden enlargement and
      contraction
27. Loss coefficient for valves
28. Comparison of pump and system characteristics
29. Vapour pressure of water
30. Typical sea water circulating system
31. Isometric view of piping layout
      (for Appendix A example calculation only)

Specifies materials, design, fabrication, installation, inspection and testing of salt water piping systems in ships, in which the design pressure in the pipes does not exceed 16 bar.

This British Standard specifies requirements for the materials, design, fabrication, installation, inspection and testing 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 exceed 16 bar2). For the purposes of this standard a salt water piping system includes all pipes and fittings from sea water inlet to discharge overboard.

NOTE Users 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.