API Std 1104:2005 pdf download.Welding of Pipelines and Related Facilities
1.1 SCOPE
This standard covers the gas and arc welding of butt, fillet, and socket welds in carbon and low-alloy steel piping used in the compression, pumping, and transmission of crude petro- leum, petroleum products, fuel gases, carbon dioxide, nitro- gen and, where applicable, covers welding on distribution systems. It applies to both new construction and in-service welding. The welding may be done by a shielded metal-arc welding, submerged arc welding, gas tungsten-arc welding, gas metal-arc welding, flux-cored arc welding, plasma arc welding, oxyacetylene welding, or flash butt welding process or by a combination of these processes using a manual, semi- automatic, mechanized, or automatic welding technique or a combination of these techniques. The welds may be produced by position or roll welding or by a combination of position and roll welding. This standard also covers the procedures for radiographic, magnetic particle, liquid penetrant, and ultrasonic testing, as well as the acceptance standards to be applied to production welds tested to destruction or inspected by radiographic, magnetic particle, liquid penetrant, ultrasonic, and visual test- ing methods. The values stated in either inch-pound units or SI units are to be regarded separately as standard. Each system is to be used independently of the other, without combining values in any way. Processes other than those described above will be consid- ered for inclusion in this standard. Persons who wish to have other processes included shall submit, as a minimum, the fol- lowing information for the committee’s consideration: a. A description of the welding process. b. A proposal on the essential variables. c. A welding procedure specification. d. Weld inspection methods. e. Types of weld imperfections and their proposed accep- tance limits. f. Repair procedures. It is intended that all work performed in accordance with this standard shall meet or exceed the requirements of this standard.
4 Specifications
4.1 EQUIPMENT
Welding equipment, both gas and arc, shall be of a size and type suitable for the work and shall be maintained in a condi- tion that ensures acceptable welds, continuity of operation, and safety of personnel. Arc-welding equipment shall be operated within the amperage and voltage ranges given in the qualified welding procedure. Gas-welding equipment shall be operated with the flame characteristics and tip sizes given in the qualified welding procedure. Equipment that does not meet these requirements shall be repaired or replaced.