S9074-AR-GIB-010/278
5.
The outer surface and, when accessible, the inner surface shall be MT/PT inspected, and the inspection shall be performed after machining operations. When postweld heat treatment or stress relief is performed, this inspection shall be accomplished after heat treatment or stress relief.
6.
RT of welds on piping in the horizontal fixed position shall represent a sector which was welded in the vertical or overhead position.
In lieu of 60-degree RT. PT or )MT may be performed on the inside of a joint where the weld is within 2-1/2 nominal pipe diameters from the open end and is back welded, has backing ring removed, or used consumable insert. Welds in boiler generating tubes and economiser elements, and external superheater tube-to- header stub welds may be MT or PT inspected in lieu of RT. For safe end welds and other welds in superheater tubes (support tubes excluded). sample RT inspection in accordance with NAVSEA 0910-LP-331-5300 may be perfomed in lieu of RT of each weld.
7.
8.
9.
RT is required only when the design pressure exceeds 575 1b/in2. For design pressure of 575 lb/in2 and less. only MT or PT inspection is required.
10.
PT inspection shall be required for seawater systems in submarines on completed P-70 through P- 72 type copper-nickel welds as defined in MIL-STD-22. Other systems shall require MT/PT and RT only when specified in the shipbuilding or component specification. PT inspection shall be required for seawater systems in submarines on completed P-70 through P- 72 type copper-nickel welds as defined in MIL-STD-22. Other systems shall require MT/PT and RT only when specified in the shipbuilding or component specification.
11.
(a)
Refer to the applicable system or component specifications for tests requirements. Testing shall be conducted on uncoated piping welds.
(a)
For repairs to systems that have passed a hydrostatlc test. rehydrostatic test is not required where repairs do not exceed 3/16 inch or 20 percent of base metal thickness, whichever is less. This exception does not apply if the repair weld is subjected to post weld heat treatment.
12.
For class P-LT piping constructed of cryogenic compatible materials such as aluninun alloys or 300 series stainless steel, the inspection requirements shall be as follows:
(a)
Butt joints and other full penetration welds - 60 degrees minimum shall be subjected to RT in addition to VT and PT inspection.
(b)
Socket welded joints and other partial penetration joints - YT and PT inspection.
Original 90
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