Base metals selections for WPS (ASME IX and AWS D1.1)

If you want to minimize cost and time to prepare WPS of both codes ASME IX and AWS D1.1. This also reduce number of PQR and save cost.

There are 3 notes in PQR:

  • Type of material
  • Wide range of qualification
  • Welder qualification

Type of material

We suggest base metal specification no API 5L grade X52 PSL1 SMLS, thickness of 12.7mm instead of featured ASTM A106 grade B or API 5L grade B PSL1 SMLS.

Reasons:

  1. NPS 8″ Sch80 is in the group of standard test pipe qualification, see AWS D1.1 table 9.10
  2. API 5L grade X52 is in group II, see AWS D1.1 para. 3.3 and table 3.1.
  3. API 5L grade X52 is grouped P-No. 1/Gr-No. 1, see ASME IX table QW-422

Wide range of qualification

ASME IX allows combination of more welding procedures with deferent essential, see QW-200.4 and base metal thickness qualification from 5 mm to 25.4 mm, see table 451.1.

AWS D1.1 allows base metal thickness qualification from 5 mm to unlimited and the qualified diameter from 100 mm to unlimited, due to qualification on standard pipe , see table 9.10.

Welder qualification

ASME IX: unlimited thickness qualification.

ASME: 6G position shall qualify for all positions.

AWS D1.1: base metal thickness qualification from 5 mm to unlimited and a qualified diameter from 100 mm to unlimited, due to qualification on standard pipe and thickness greater than 10mm, see table 9.14 .

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