Intermediate stress relief treatment

[Neilashkumar]

Dear All, 

Good Day ! As per our client aramco , insisting us to do dehydrogenation treatment for P11 material after welding completion for four hours prior to PWHT.

Please clarify whether post heat maintainence for 4hours is mandatory for fillet weld.

As per our WPS  I am doing it for  groove joints , it is clad vessel for 145 inch diameter ... 

Above that insulation and pad welding Accor , is there any clause given in ASME section states that post heat maintainence is not required for P11 material.

As per aramco standard SAESW014 General it is given

P.NEILASHKUMAR 

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[pgoswami]

Hi Neilashkumar,

 

There’s no answer to such questions in these “Open Forum”. If such conditions are stipulated in your project specifications, then it’s deemed as mandatory. In order  to get a deviation or any waiver please discuss the same with clients and then come up with some consent/understanding.

 

Many clients insists on “Dehydrogenation” to safeguard against hydrogen induced damages (especially wet hydrogen cracking”) in refining environments. In view of such imminent damage and other forms of hydrogen damages in refining environments, dehydrogenation treatment is most commonly asked for in present day fabrication standards.

 

Thanks.

 

Pradip Goswami, P.Eng,IWE
Independent Welding & Metallurgical Engineering Specialist & Consultant.
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

pgos...@quickclic.net

pradip....@gmail.com

 

 

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Dear All, 

 

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[Murthy Reddy]

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[pradip kumar Sil]

For P-11 Upto 13mm PWHT is not required also. For P-11 material intermediate stress relief is not required.

[Kannayeram Gnanapandithan]

If customer requirements, no other way

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[Vishwas Keskar Welding Manager Pune India]

dear sir,

ASME SEC IX OR SEC I , does not give any guidelines for DHT ie post heating.The end user or fabrication company shall decide @DHT based on material , welding joint thickness ,consumable being used (H2 content)

SABIC impose rules when COC are lenient .

[Ram Chatt]

Hi Mr.Neilash Kumar,

If you are doing Vessel you have to check with API RP-934 A.There is mentioned requirements of dehydrogenation treatment  (post heating).

[George Dilintas]

Preheat Maintenance is a Supplementary Essential Variable for Procedure Qualification. I.e applicable when impact test is required by the Design Code. So if Engineering (ARAMCO) rerquires post heating, you have to make a PQR with post heat maintenance

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis