RE: [MW:22051] PWHT holding time range for Pqr acc.to EN15614-1

Hi Mr Karthik,

Thank you for your reply. It is really very helpful.

I want to ask one more question for clarify.

If we do pqr (t=25mm, will qualify thickness 12.5<t<50mm) with holding time 200 minutes for to qualify 50mm thickness 2 times (considering the repair), the qualified thickness 12.5mm will be 8 times qualified. it means we can do repair welding several times (as long as company procedure permit), and there will not be any problem to prepare Wps for thickness  t=12.5mm from that Pqr with holding time 25minutes , am i right?

Shortly, as long as holding temperature are within limits (+/- 20 degree Celsius as per EN15614-1 8.4.12), for holding time i will consider qualified the tickest tickness (x2 cycle - in case of repair)  from EN13480-4 table 9.14.1-1 and i can prepare Wps for qualified the thinnest material. 

Best regards.

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Date: Sun, 5 Oct 2014 21:28:37 -0700
From: materials-welding@googlegroups.com
Subject: Re: [MW:22040] PWHT holding time range for Pqr acc.to EN15614-1
To: materials-welding@googlegroups.com

Hi,

Please find below my suggestions as marked in Red.

If we do pqr with holding time 50 minutes,

1.       Does it qualify 50mm thickness with Pwht (as per EN 13480-4 t=50mm requires 100minutes holding time) - EN13480-4 specifis the minimum holding time and EN15614-1 restricts holding temperature and the holding temperature shall not deviate 20 degree celsius (plus or minus) to the qualified procedure.According to EN15614-1,Section 8.4.12; heating rate,cooling rate and holding time shall be related to the product. So in your case you go for 100 minutes holding time with holding temperaure of 670 to 720 degree celsius.

2.       What will be holding time for t=12.5mm material at reality (it will be same as pqr which we hold 50minutes, if so there is conflict with EN 13480-4 because as per this standard t=12.5mm require 25 minutes holding) - No conflict., EN13480 specifies the minimum holding time.

3.       For to qualify pqr in case weld repair after pwht, what shall be my holding time?

Pwht subject is not clear for me on procedure qualification. Hence there is several pqr I need to prepare and most of them with Pwht. I hesitate if the pqr which I prepare will not qualify repair weld after PWHT.

I need your help about issue.

Thanks in advance. - According to EN13480-4,section 9.14.1; If there is any repair done after PWHT., follow as per table 9.14.1(I Suggest you qualify your PQR with 2 cycles)

 

Hope it clear

 

Thanks & Regards,

(Karthik)

Karthikeyan.S

QA/QC Manager

German-Thai Boiler Engineering Cooperation Limited.

Rayong Factory ;

379 Moo.6 Soi 8, Tambol Pananikom,

Nikompattana, Rayong 21180 THAILAND

Tel : +66 38 897 035-9 Ext. 137

Fax : +66 38 897 034

Hand Phone: 0066 892512282

On Friday, October 3, 2014 8:04 PM, nirvana kz <nirvanakz@live.com> wrote:

Hello friends,

I have a question about welding procedure qualification with post weld heat treatment which will be prepared as per EN 15614-1.

Material 13CrMo4-5 group number 5.1 as per ISO 15608. Material thickness 25m and diameter 273mm.

As per EN 13480-4 it requires Pwht holding time (2xt) = 50 minutes.

As per EN 15614-1, t=25mm thickness, qualification thickness range is 12.5<t<50mm.

 

If we do pqr with holding time 50 minutes,

1.       Does it qualify 50mm thickness with Pwht (as per EN 13480-4 t=50mm requires 100minutes holding time)

2.       What will be holding time for t=12.5mm material at reality (it will be same as pqr which we hold 50minutes, if so there is conflict with EN 13480-4 because as per this standard t=12.5mm require 25 minutes holding)

3.       For to qualify pqr in case weld repair after pwht, what shall be my holding time?

Pwht subject is not clear for me on procedure qualification. Hence there is several pqr I need to prepare and most of them with Pwht. I hesitate if the pqr which I prepare will not qualify repair weld after PWHT.

I need your help about issue.

Thanks in advance.

 

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