PWHT range for WPS

[Ram Patel]

Dear Experts

Can anybody explain me following about WPS & PQR as per ASME sex IX.

If my PQR qualifed with soaking temperature 630 deg. C to 650 deg. C and soaking time 2 hrs 30 minutes maximum, so my question is can WPS qualify for temperature range 600-620 deg.c or above 650 deg.c and soaking time 3 hrs or 2hrs.

My question for which temperature range or soaking time range I can use for WPS if my PQR qualified as per above mentioned PQR range ?.

Thanks in advance

Thanks

Ram

[Zakaria ghrab]

Dear Ram,

  the PWHT  temperature depend only to material grade. Your PQR is prepared for this range of temperature according material grade, so you can use it for the same material grade in production.

The time is according material thickness, you check the thickness qualified range and calculate the time as 1h per 01 inch thickness. (Refer to your construction code)

Regards.

2013/9/2 Ram Patel <rampatel...@gmail.com>

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Yesterday is the pass, tomorrow is the future; and today? Today is the present, the gift: Enjoy it!

[james gerald]

1. You need to mention what type of material and P. No. it belongs to.

2. Whether Impact test is specified or not as per design conditions.

 

Thanks & Regards

J.Gerald Jayakumar
00968-99438165

[Prakash Hegde]

Dear Mr Ram Patel

Given my opinion below

Regards

Hegde

 

From: Ram Patel <rampatel...@gmail.com>
To: material...@googlegroups.com
Sent: Monday, 2 September 2013 11:29 AM
Subject: [MW:18561] PWHT range for WPS

Dear Experts

Can anybody explain me following about WPS & PQR as per ASME sex IX.

If my PQR qualifed with soaking temperature 630 deg. C to 650 deg. C and soaking time 2 hrs 30 minutes maximum, so my question is can WPS qualify for temperature range 600-620 deg.c or above 650 deg.c and soaking time 3 hrs or 2hrs

It depends upon  Impact requirement i) If your PQR is qualified for Non Impact requirement in this case You have to satis fy QW407 .1   where The PWHT temp below crirical tempi.e. 720C   is acceptable and you can use PWHT temp between 600-720C However () Please bear in mind that CS grade  UTS deteoriates with Higher temp PWHT with higher soaking time even say above 650C-720C  .PWHT hence generaly the UTS0f  CS component being PWHT between 600-630C ( some time even at 650C PWHT deteriotes)

ii) In case of Impact requirement -You require to satisfy QW407.1 and 2  where time and temp of PWHT is suplimentary Essential

Generaly some of the licensor do not allow PWHT temp above 630C  for CS and they will agree only when you qualify PQR separately at that higher temp say above 650C but below 700C

My question for which temperature range or soaking time range I can use for WPS if my PQR qualified as per above mentioned PQR range ?.

Thanks in advance

Thanks

Ram

[Ram Patel]

Dear James

Material is SA 516 Gr 70 # SA 516 Gr 70 (P no. 1, Group-2) and Impact test not required

PQR - thickness 50 mm and shell & dished end 70 & 78 mm thk.

Thanks & Regards

Ram

[Octane Mac]

In your case, soaking time is not an essential variable. Also, if you keep below 720 C, temperature range would also be not an issue. Compliance to your construction code is also necessary.

[Antonio Diaz]

Dear James
You should specify minimum temperature of design. According to ASME SEC. VIII DIV. I is necessary to know it. Depending of min. Temp. Of design you will know if you need or not.

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De: Ram Patel
Enviado: 02/09/2013 05:28 a.m.
Para: material...@googlegroups.com
CC: james gerald
Asunto: Re: [MW:18570] PWHT range for WPS