PWHT Requirement for SA 335 P91 (or P no. 5B Group 2)

[ASIF]

Dear experts!

Project : Solar Power Plant

Construction Code ASME B31.1

ASME Sec IX

PWHT Requirement - SA 335 P91 or P no. 5B Group 2 material is not included in 132 Para and Table of B31.1, and also,

ASME Sec IX para QW-407 do not mention this material group.

Client Specification do not mention this requirement separately

Please advise! do we need to go for PWHT ?

[Bathula Raghuram (Mumbai - PIPING)]

It is included in B31.1 as P5B in old editions, however  this material is regrouped as P15E in latest edition of ASME BPV Sec IX, , pl refer the table below.

 

[c.no...@vipco-thai.com]

Dear Sir,

From my understanding and experiences , P91 always need PWHT after weld for most of the cases.

If I am not wrong , now P91 should be classified to different P No. ( P15E ??? ) , please check from the most updated ASME IX.

Regards,

C.Nopadon

 

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of ASIF
Sent: Tuesday, September 27, 2011 12:12 PM
To: material...@googlegroups.com
Subject: [MW:12545] PWHT Requirement for SA 335 P91 (or P no. 5B Group 2)

 

--
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

[pgoswami]

Hello Asif,

 

I have seen the use of P-91 material in conventional thermal generation units, coal, HRSG ,Coal+Biomass. If the plant in question is a solar power plant, then what're the design and operating conditions (e.g temperature, pressure )?

 

Appreciate your response. 

 

Thanks.

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist & Consultant

Ontario,Canada.

Email-pgoswami@sympatico.ca,

pgos...@quickclic.net

 

---

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Bathula Raghuram (Mumbai - PIPING)
Sent: Tuesday, September 27, 2011 1:30 AM
To: 'material...@googlegroups.com'
Subject: RE: [MW:12546] PWHT Requirement for SA 335 P91 (or P no. 5B Group 2/ 15E group 1)

[lntqcsipat]

Dear sir,

 

Irrespective of the Pressure ,temperature, thickness and usage conditions,  PWHT is made mandatory in our site

(client : NTPC, Manufacturer : DOOSAN)

Only proper PWHT Can ensure the required austenite structure which is primarily responsible for the characteristics of P91 Material.

Also type of heating : Resistance or induction is to selected carefully.

In our site upto 15mm resistance method and  above 15mm induction method is used.(refer attached model chart for P91 for reference)

 

M.SRINIVASAN

QA/QC

L&T-SIPAT

 

---

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of c.no...@vipco-thai.com

Sent: Tuesday, September 27, 2011 11:34 AM
To: material...@googlegroups.com

[ASIF]

@Raghuram ... Thank you very much for your prompt and sufficient response

@Goswami Sir! Please see the table below. If you require more information i will forward 

Regards

ASIF

+971-50-9198730

[Mumtaz Ali Khan]

Dear Asif

Its very critical matril and care shoud be for preheating,postheating and strss relieving.For you,s comfor i am attaching a complete method statement forfabrication of P91 mterial

 

Thanks

 

Mumtaz