ASME B31.3W305的请教

mrmalcolm

W305 FLUID SERVICE REQUIREMENTS

W305.1 General

The requirements in Chapters I through VI apply in addition to the requirements of this Appendix. When the fatigue damage, dt, computed in accordance with para. W302.1 exceeds 0.5 or when SEW, computed in accordance with para. W302.2, exceeds 0.8Saw, the requirements for severe cyclic conditions in Chapters I through VI shall apply. For special applications, e.g.,offshore piping, the owner may elect to require the supplemental requirements of para.W305.3.

W305.3 Optional Supplemental Requirements

When these supplemental requirements are specified,the requirements for para.W305.1 also apply.

The following additional examination is required:

All longitudinal welds shall be fully radiographed in accordance with para.344.5（P89）with acceptance criteria in accordance with Table 341.3.2 for Normal Fluid Service.

The extent of examination of circumferential groove welds shall be as follows:

(a) At least 10% of the welds shall be randomly examined using the liquid penetrant method (para. 344.4) or, for magnetic materials, the magnetic particle method (para.344.3) with acceptance criteria in accordance with para341.3.2

(b) When the requirements for severe cyclic conditions do not apply, a minimum of 10% of the welds shall be fully radiographed in accordance with para.344.5 with acceptance criteria in accordance with Table 341.3.2 for Normal Fluid Service.

Piping specified as critical by the owner shall be subjected to 100% radiography and 100% liquid penetrant or magnetic particle examination using the methods and acceptance criteria described above.

请问这里只提到RT，不能使用UT代替RT吗？另外，对于管子拐弯处，是否有角接接头，如果有角接接头，做RT是否可能？谢谢。