Tuesday, September 14, 2010

[MW:6990] pWPS for Impact Test (-50 F) + PWHT

Dear All,
 
There some question which I wish to know the answer from friends of all the expert.
There is a pWPS applied for Code ASME B31.3, data design is as follow :
1. Design Press. (psig) = 3028
2. Design Temp. (deg F) = -50/200
3. Oper. Temp. (deg F) = 2875
4. Test Pressure (psig) = 4920
5. Stress Relieve = NO
6. Material Spec. = Pipe (API 5L Gr. X65) and Flanges (ASTM A694 Gr. F65 - Must be Impact Tested at -50F)
 
The question is, they submit pWPS Impact with PWHT, why PWHT there must be.?
In seeing from the data as above there is no Stress Relieve.
 
Great appreciate all of you about this concern. Thank you.
 
Rgrds,
Tomi
 
 

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