Buy API STD 1104:2021+ADD 1:2026

Welding of Pipelines and Related Facilities

Available format(s)

PDF

Language(s)

English

Published date

01-09-2026

Publisher

American Petroleum Institute

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£359.65

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Summarise this standard

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This standard covers the gas and arc welding of butt, branch, and fillet welds in carbon and low-alloy steel pipe and piping components used in the compression, pumping, and transmission of crude petroleum,petroleum products, fuel gases, carbon dioxide, nitrogen, and, where applicable, covers welding on distribution systems

DocumentType	Standard
Pages	185
ProductNote	This standard also refer to NACE MR0175/ISO, AWS A5.32
PublisherName	American Petroleum Institute
Status	Current
Supersedes	API STD 1104:2021 INC ERR 1:2023

Frequently Asked Questions

API 1104 specifies welding of pipelines and related facilities, including procedure and welder qualification and inspection. It is a United States standard published by American Petroleum Institute (API).

API 1104 is used by pipeline contractors, welders, inspectors and operators. It is a United States standard published by American Petroleum Institute (API).

API 1104 is American Petroleum Institute (API)'s standard for pipeline welding, while AWS D1.1/D1.1M covers structural welding (United States). API 1104 specifies welding of pipelines and related facilities, including procedure and welder qualification and inspection. AWS D1.1/D1.1M specifies requirements for welding procedures, personnel, workmanship and inspection for structural applications.

No — API 1104 is a United States standard published by American Petroleum Institute (API), with its listed region as United States.

API 1104 specifies welding of pipelines and related facilities, including procedure and welder qualification and inspection. In practice it is applied by pipeline contractors, welders, inspectors and operators.

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API STD 1104:2021+ADD 1:2026

Welding of Pipelines and Related Facilities

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What does API 1104 cover?

Who uses API 1104?

What is the difference between API 1104 and AWS D1.1/D1.1M?

Is API 1104 an Australian standard?

What is API 1104 used for?