Indiscriminately substituted for a material that was used in the qualification test without consideration of the compatibility of the base materials and filler metals from the standpoint of metallurgical and mechanical properties and requirements for pre- and post-heat treatment". " The groupings specified in 5.4.2.2 do not imply that base materials or filler metals of different analyses within a group may be There is finally the comment from API 1104 5.4.2.2 that should be examined by your Engineering Group prior to commencing on a WPS qualification program: With respect to OD, some companies qualified on NPS 10 or 12 while some qualified on a variety of diameters. As a suggestion, you could consider using a thickness near 0.500” as this somewhat represents the mid-point of the 3/16” to ¾” suggested grouping. Accordingly, the thickness you select should have an engineering basis you can rely on should the regulator question how you selected these thicknesses for PQR testing. Not generally so for X60 or certainly above. For the lower grade materials such as X42, you could somewhat easily find pipe thicknesses less than 3/16”. With respect to diameter and wall thickness, for WPS qualification, API 1104 gives suggested groupings, but does not dictate the testing program. However, for you to be completely covered for all combinations from Grade B to X70, with respect to materials alone,the following qualification tests will be necessary: For example, other industry standards, reliable engineering tests and analyses, or established industry practices may provide useful reference to establish sound engineering judgment.For your example, X70 to X42, your WPS will need to be qualified on X70 material.ĪPI 1104 5.4.2.2 reference follows: “ When welding materials of two separate material groups, the procedure for the higher strength group shall be used”. The absence of guidance or requirements is not to be considered prohibitive to a particular activity or approach that is based upon sound engineering judgment. While this standard is comprehensive, it may not address all issues that may arise. It is intended that all work performed in accordance with this standard meets or exceeds the requirements of this standard. The figures depicted in this standard are not drawn to scale. Each system is to be used independently of the other, without combining values in any way. customary units (USC) or metric units (SI) are to be regarded separately as standard. 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 testing methods. The welds may be produced by position or roll welding or by a combination of position and roll welding. The welding may be done by a shielded metal arc welding, submerged arc welding, gas tungsten arc welding, gas metal arc welding, fluxcored arc welding, plasma arc welding, or oxyacetylene welding process, or by a combination of these processes using a manual, semiautomatic, or mechanized welding technique or a combination of these techniques. It applies to both new construction and in-service welding. 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. API STD 1104, 22nd Edition, September 2023 - Welding of Pipelines and Related Facilities
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |