TABLE 5-2
Class 1 Piping Materials
MATERIAL/ITEM
SHAPE
SPECIFICATION
Stainless Steel
Pipe
ASTM A-312
Alloys Grs: TP310 & 316
Forgings
ASTM A-336
Flanges & Fittings ASTM A-350
Castings
ASTM A-352
Ni-Cu (Monel)
Cast
QQ-N-288
Wrought
QQ-N-281
Tubing
MIL-T-1368 Class A, ASTM B-466
70/30 Cu/Ni
Cast
MIL-C-20159
Wrought
MIL-C-15726 ASTM B-402, Alloy 715
Tubing
MIL-T-16420 ASTM B-466, Alloy 715
Valve Bronze
MIL-B-16541 ASTM B-62
ASTM B-61
Seawater Valves
MIL-V-24287
Aluminum Bronze
Cast
MIL-B-23921 ASTM B-271
(min. 4% Ni)
Wrought
MIL-B-24059
Oxygen Bottles
These are Class 1 materials only when fabricated and tested to appropriate
specifications
The use of Class 2 material in systems of hazard category I or II requires
the suppliers certificate supplemented by specific information to assure
reliability in the particular application.
When Class 3 materials are to be used in hazard category II or III systems,
additional justification in the form of documentation and material test
reports is required. Hazard category IV systems may be made up of
commercially-available materials and components without special
documentation.
a. Justification of Class 2 Materials. As a minimum, the following
information will be necessary to justify the use of a Class 2 material in
category I or II piping system.
(1) The applicable Military, Federal, or commercial specification
involved with a list of exceptions or additions.
(2) Tensile properties, including ultimate tensile strength,
tensile yield strength, percent elongation, and reduction of area.
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