Weld repairs without PWHT in the petroleum industry

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Bulletin - Welding Research Council

OSTI ID:471158

Ibarra, S J ^[1]

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1. Amoco Corp., Naperville, IL (United States)

This paper reviews the experience of using NBIC rules in the petroleum industry and compares the 1989 NBIC with the 1995 NBIC. Repair welding of pressure vessels typically occurs for carbon steels (P-1), carbon-{1/2}Mo steels (P-3), 1(1/4)Cr-{1/2}Mo steels (P-4), and 2{1/4}Cr-1Mo steels (P-5A), but the more common repairs are on the lower alloy P-1 and P-3 vessels. In the petroleum industry, repairs on these vessels require a postweld heat treatment (PWHT) because of ASME VIII thickness limitations or to lower the hardness to prevent hydrogen cracking during operation.

• OSTI ID: 471158
• Journal Information: Bulletin - Welding Research Council, Journal Name: Bulletin - Welding Research Council Journal Issue: 412; ISSN 0043-2326; ISSN WRCBA2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
CARBON STEELS
HEAT TREATMENTS
LOW ALLOY STEELS
PETROLEUM INDUSTRY
PRESSURE VESSELS
REPAIR
STANDARDS
WELDING