• ASTM A312 & A358 & A778

    Standard: ASTM A312/A358/A778, ASME B36.19M, ASME B36.10M
    Alloy: 301, 304/304L, 305, 316/316L, 430, 409L
    (DIN 1.4301, 1.4307, 1.4401, 1.4404)

    ASTM A358
    Five classes of pipe are covered as follows:
    1.3.1 Class 1—Pipe shall be double welded by processes employing filler metal in all passes and shall be completely radiographed.
    1.3.2 Class 2—Pipe shall be double welded by processes employing filler metal in all passes. No radiography is required.
    1.3.3 Class 3—Pipe shall be single welded by processes employing filler metal in all passes and shall be completely radiographed.
    1.3.4 Class 4—Same as Class 3 except that the weld pass exposed to the inside pipe surface may be made without the addition of filler metal (see 6.2.2.1 and 6.2.2.2).
    1.3.5 Class 5—Pipe shall be double welded by processes employing filler metal in all passes and shall be spot radiographed.