[MW:13536] REGARDING PWHT of STORAGE TANK CLEAN OUT DOOR.

Dear All,

I intended to use the following  WPS  for  storage tank clean out door welding :

Test coupon thickness  -   40 mm.

Material                       -   SA 516 Gr 70

Welding process          -   SMAW.

Electrode                    -    E 7018-1

PWHT  Temperature     -   620 - 650 degree centigrade.

Soaking time               -   180 minutes.

Rate of heating            -   130 Degree centigrade.

Rate of heating            -   130 Degree centigrade.

Storage tank detail:

Shell thickness              - 18 mm

Annular plate thickness  -  20 mm

Clean out door neck       -  18 mm

Clean out door flange      -  20 mm

Material                         -  SA 516 Gr 70

Welding process            -   SMAW

Electrode                       -   E 7018 -1

Stress relieving temp      -   620 - 650 degree centigrade.  

Soaking time                 -   60 minutes.

Rate of heating              -   150 - 200 Degree centigrade.

Rate of heating              -   150 - 200 Degree centigrade

My doubt is whether the soaking time in the PQR is acceptable or I have to qualify another WPS.

Thanks in advance.

Manoj

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