Material Type for Pipes

Material	Allowable classes	Maximum design temperature (1)	Particular conditions of use
Carbon and  carbon-manganese steels	III, II, I	400 (2)	Class I and II pipes are to be seamless drawn pipes (3)
Copper and  aluminium brass	III, II, I	200	Not to be used in fuel oil systems, except for class III pipes of a diameter not exceeding 25 mm not passing through fuel oil tanks
Copper-nickel	III, II, I	300	Not to be used for boiler blow-down valves and pieces for connection to the shell plating
Special high temperature resistant bronze	III, II, I	260	(4)
Stainless steel	III, II, I	300	Austenitic stainless steel is not to be used for sea water systems
Spheroidal graphite cast iron	III, II (5)	350	Minimum elongation is not to be less than 12% on a gauge length of 5,65.S0,5, where S is the actual cross-sectional area of the test piece  Not to be used for boiler blow-down valves and pieces for connection to the shell plating
Grey cast iron	III  II (6)	220	Grey cast iron is not to be used for the following systems:  boiler blow-down systems and other piping systems subject to shocks, high stresses and vibrations  bilge lines in tanks  parts of scuppers and sanitary discharge systems located next to the hull below the freeboard deck or for passengers ships below the bulkhead deck  ship side valves and fittings  valves fitted on the collision bulkhead  valves fitted to fuel oil and lubricating oil tanks under static pressure head  class II fuel oil systems and thermal oil systems
Aluminium and  aluminium alloys	III, II	200	Aluminium and aluminium alloys are not to be used on the following systems:  flammable oil systems  sounding and air pipes of fuel oil tanks  fire-extinguishing systems  bilge system in boiler or machinery spaces or in spaces containing fuel oil tanks or pumping units  scuppers and overboard discharges except for pipes led to the bottoms or to the shell above the freeboard deck or fitted at their upper end with closing means operated from a position above the freeboard deck  boiler blow-down valves and pieces for connection to the shell plating

( 1 )    

Maximum design temperature is not to exceed that assigned to the class of piping. 

( 2 )    

Higher temperatures may be accepted if metallurgical behaviour and time dependent strength (ultimate tensile strength after 100 000 hours) are in accordance with national or international standards or specifications and if such values are guaranteed by the steel manufacturer. 

( 3 )    

Pipes fabricated by a welding procedure approved by the Society may also be used. 

( 4 )    

Pipes made of copper and copper alloys are to be seamless. 

( 5 )    

Use of spheroidal cast iron for class I piping systems will be given special consideration by the Society. 

( 6 )    

Use of grey cast iron is not allowed when the design pressure exceeds 1,3 MPa.