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API Std 1104-2005 pdf free download

API Std 1104-2005 pdf free download.Welding of Pipelines and Related Facilities.
1 General 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.
3.2.9 mechanized welding: A process where parame- ters and torch guidance are controlled mechanically or elec- tronically but may be manually varied during welding to maintain the specified welding conditions. 3.2.10 position welding: Welding in which the pipe or assembly is not rotating while the weld is being deposited. 3.2.11 qualified welder: A welder who has demon- strated the ability to produce welds that meet the require- ments of Sections 5 or 6. 3.2.12 qualified welding procedure: A tested and proven detailed method by which sound welds with suitable mechanical properties can be produced. 3.2.13 radiographer: A person who performs radio- graphic operations. 3.2.14 repair: Any rework on a completed weld that requires welding to correct a fault in the weld that has been discovered by visual or nondestructive testing and is beyond this standard’s limits of acceptability. 3.2.15 roll welding: Welding in which the pipe or assem- bly is rotated while the weld metal is being deposited at or near the top center. 3.2.16 root bead: The first or stringer bead that initially joins two sections of pipe, a section of pipe to a fitting, or two fittings. 3.2.17 semiautomatic welding: Arc welding with equipment that controls only the filler-metal feed. The advance of the welding is manually controlled. 3.2.18 shall: Term that indicates a mandatory require- ment. The term should indicates a recommended practice. 3.2.19 weld: The completed weld joining two sections of pipe, a section of pipe to a fitting, or two fittings. 3.2.20 welder: A person who makes a weld. 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.

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