Requirements of PWHT Offshore Jacket Pipe

[senthil thandesh]

Dear Experts,

Good Morning,

We are having our own project to build an offshore jacket for a depth of 15 to 20 meter water depth. For this project we are in the stage to order the material (PIPE) from the Steel Mill. In order to start the process the mill is asking for the SPEC of PWHT. So can anyone able confirm what should be the Holding temp / time / No of cycle / Stress relieving cycle required for PWHT.

Sl.No	Material Size	Grade	Remark
1	24" Pipe x 25mm wall thick	API 5L Gr.X52N PSL2	Normalizing Steel
2	30" Pipe x 30 mm wall thick	API 2H GR.50 +(Z35)	Normalizing Steel
3	20" Pipe x  25mm wall thick	API 5L Gr.X52M PSL2	TMCP Steel

 

 

Regards

Thandesh

[George Dilintas]

you can use that one for Pno 1 material

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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

[senthil thandesh]

Need  experts advice, below detail based on old project ref

Temp for Normalizing steel - 600 to 630 degree C

Holding time - 3 to 4 hrs for thickness 15mm to 40 mm

No of cycle - 1

 

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