Dear Manoj,
Pls. check 5.7.4.2 of API 650 to ascertain whether you require PWHT or not?
However you can use the same PQR , no need for new PQR. Refer QW 407.2 of Section IX
i.e you can reduce the actual PWHT time but not to increase the PWHT time more than 120 %.
e.g
PQR, PWHT soak time 60 minutes - Actual PWHT soak time at job can be 72 minutes or less
PQR PWHT soak time 180 minutes - Actual PWHT at job can be 216 minutes or less
QW-407.2 A change in the postweld heat treatment
(see QW-407.1) temperature and time range
The procedure qualification test shall be subjected to
PWHT essentially equivalent to that encountered in the
fabrication of production welds, including at least 80% of
the aggregate times at temperature(s). The PWHT total
time(s) at temperature(s) may be applied in one heating
cycle.
Cheers
MM
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of manoj john
Sent: Tuesday, January 24, 2012 7:26 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:13554] REGARDING PWHT of STORAGE TANK CLEAN OUT DOOR.
Applicable Code is ASME SEC IX.
Impact test not required.
On Mon, Jan 23, 2012 at 12:49 PM, james gerald <gerry_tup@yahoo.com> wrote:
Please give the detail of the applicable code and whether Impact test is required based on MDMT
Thanks & Regards J.Gerald Jayakumar 0091-9344954677
From: manoj john <manojacgnr@gmail.com>
To: materials-welding@googlegroups.com
Sent: Saturday, January 21, 2012 7:55 PM
Subject: [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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