![]() Acceptance criteria for Linear Indication (UW – 51):ġ. Rounded indications may appear on radiographs from any imperfection in the weld, such as porosity, slag, or tungsten. While determining the size of an indication, the tail shall also be included. A rounded indication may be circular, elliptical, conical, or irregular in shape and may have tails too. Rounded Indication: Any indication with a length equal to or less than three times the width. Linear indications are mainly cracks, lack of penetration, lack of fusion, and elongated slag inclusions. Linear Indication: Any indication with a length greater than three times the width. (Refer: UW-51: Sub Para b ( and 149) and Mandatory Appendix 4 ( and ) of ASME BPVC Section VIII Edition.)įollowing terminologies have been used to explain the acceptance/rejection criteria for Radiography Test (RT) Example of suggested groupings are shown in 6.2.2, items d and e.įor welder qualification, thickness and OD groupings shown for single qualification are mandatory.įinally, I recommend that you obtain a copy of the PRCI document “Guidelines for Interpretation and Application of API 1104 –Twenty-first Edition” as it provides excellent information regarding anything related to API 1104.Īlthough PHMSA has not yet incorporated the 21st edition of API 1104 by reference into either Part 192 or 195, this document provides the framework your company could use to establish welding procedure qualification, in particular, to the use of dual or triple stenciled materials on different thicknesses.************************* Acceptance criteria for Radiography Test (RT) The ranges of outside diameters and wall thicknesses over which the procedure is applicable shall be identified. The same comments apply to the qualification of fillet weld procedures.īe aware that the suggested OD and thickness ranges for WPS qualification are just that: suggested e excerpt below: 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 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”.
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