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FOMA Bohemia Ltd.
FOMA Bohemia is a traditional producer of industrial radiographic films INDUX and related accessories.

1906 views
02:24 Aug-24-2007
Binh, Du Xuan
NDT after PWHT

Dear All,

Pipe spool fabrication base on Code and standards B31.3.

Everyone can give to me advice ?

MT after PWHT shall be done or not necessary ?

Thanks and Best Regards,


 
08:38 Aug-24-2007

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1094
Re: NDT after PWHT
See B31.3 Para. 341.3.1.(a) "For P-Nos. 3, 4, and 5 materials, examination shall be performed after completion of any heat treatment."

This implies that P1 and P2 materials do not require examination after heat treatment UNLESS otherwise specified by the contract or relevant procedures.


 
08:29 Aug-24-2007
G.Madhesan
Re: NDT after PWHT MT must be carriedout after any PWHT for detectingany stress cracks.
Regards,
Madhesan





 
04:53 Aug-25-2007

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1094
Re: NDT after PWHT Madhesan

Yes you are right MT, is for detecting cracks (amongst other defects), however the Code writers are very experienced in the welding and heat-treating of standard materials (i.e. Group P1) and are sufficiently confident that proper PWHT of such materials will not cause cracking to be able to codify this with no requirement for PWHT MT. So in the case of welding plain carbon (P1)steels, "must" does not apply.


----------- Start Original Message -----------
: MT must be carriedout after any PWHT for detectingany stress cracks.
: Regards,
: Madhesan
------------ End Original Message ------------




 


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