The American Petroleum Institute has issued the 20th edition of API Standard 1104, Welding of Pipelines and Related Facilities. The standard covers the welding of butt, fillet, and socket welds in carbon and low-alloy steel piping used in the compression, pumping, and transmission of crude petroleum, petroleum products, fuel gases, carbon dioxide, and nitrogen. Where applicable, it also covers welding on gas distribution piping.
In addition, the standard includes procedures for radiographic, magnetic particle, liquid penetrant, and ultrasonic testing and the acceptance standards for production welds tested to destruction or inspected by these as well as by visual testing methods.
The standard applies to both new construction and in-service welding.
Significant changes from the 19th edition of the standard include a new revision in the radiographic testing acceptance standard in the area of “burn-through,” a revision in the procedures for radiographic test methods (the total elimination of the use of hole-type penetrameters), removal of the requirement for nick break testing, and improved practices for welding on in-service pipelines.
The U.S. Department of Transportation expects to incorporate API’s revised standard into regulation by reference into the Federal Register within the next 6-12 months.