Hello all

Please can anybody help me with this topic: In which point does the code (ASME V) stablish when NDT must be delivered? Before or after PWHT (If required)? Both? Is it possible according to the code to deliver them just before PWHT?

Thank you very much. Regards

Jaime

Jaime,
Depending which NDE method is used Sec.V tells you when to perform NDE before or after PWHT.

RT-Method (reference Article 22, 9.1):
Unless otherwise specified by the applicable job order or contract, perform radioscopy prior to heat treatment.

UT-Method (reference Article 23, 7.1.2):
Perform the ultrasonic examination after heat treatment for mechanical properties (exclusive of stressrelief treatments) but prior to drilling holes, cutting keyways, tapers, grooves, or machining sections to contour. If the configuration of the forging required for the treatment for mechanical properties prohibits a subsequent complete examination of the forging, it shall be permissible to examine prior to treatment for mechanical properties. In such cases, reexamine the forging ultrasonically as completely as possible after heat treatment.

UT-Method (reference Article23, SA435, 5.1):
Ultrasonic examination shall be made on either major surface of the plate. Acceptance of defects in close proximity may require inspection from the second major surface. Plates ordered in the quenched and tempered condition shall be tested following heat treatment.

MT-Method (reference Article 25, 1.1):
This guide describes techniques for both dry and wet magnetic particle examination, a nondestructive method for detecting cracks and other discontinuities at or near the surface in ferromagnetic materials. Magnetic
particle examination may be applied to raw material, semifinished material (billets, blooms, castings, and forgings), finished material, and welds, regardless of heat treatment or lack thereof. It is useful for preventive maintenance examination.

ET-Method (reference Article 26, 10.4):
Tubes may be examined at the finish size after the final anneal or heat treatment, or at the finish size prior to the final anneal or heat treatment unless otherwise agreed upon between the supplier and the purchaser.

Regards
Marcel

Hello all,
Which takes precedence - ASME V or the fabrication code ?
Marcel has noted ASME V Article 22, 9.1 requires RT before PWHT but ASME B31.3 requires all examination for P Nos 3,4 and 5 to be performed after PWHT.
Regards,
BB

Sorry guys,
After further research I will answer my own question.
I am assuming that the original posting was regarding the NDT of weldments.

Article 22 Clause 9.1 is only applicable to radioscopic examination and not radiographic examination.
Therefore RT should be done as per fabrication code requirements.
Article 23 Clause 7.1.2 is the Specification for UT of Heavy Steel Forgings.
Article 23 Clause 5.1 is the Specification for Straight Beam UT of Steel Plates.
Therefore UT should be done as per fabrication code requirements.
Article 26 Clause 10.4 is the Specification for Eddy Current Examination of Copper and Copper Alloy Tubes.
Therefore ET should be done as per fabrication code requirements.

Other than the forementioned requirement of B31.3 I can find no other requirement as to whether RT must be performed before or after PWHT.
Anybody else aware of any code requirements ?
Regards,
BB