[MW:25528] Re: NDE rate in boiler

nps < 4 " = if RT  is taken, the acceptance shall be as per written down RT PROCEDURE 

 

P91 - RT BEFORE AND AFTER BOTH is required as a good eng practice

On Wednesday, October 12, 2016 at 2:30:12 PM UTC+5:30, Tunisian Quality Engineer wrote:

Dear Experts,

  Need your assistance.

Applicable code : ASME sect I

Query : 

1- For Pipes/tubes NPS less than 4" diameter, we need to perform NDE with some ratio, basically according code is not mandatory (table PW-11) : Please inform if any other indication about this issue in code.

2- Could us perform NDE (RT : Volumic) before pwht and complete only by (MT: Surfasic) after pwht for P91 and also for others grades according ASME sect I. What's code requirement for NDE/Pwht.

tat 

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Thanks and Regards, 

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