[MW:16405] Re: high presssure pipe welidng as per ASME B 31.3, Chapter. IX requirements

The pressure rating of the piping system will dictate the flange and pipe thickness and this is calculated from the allowable stress in the material at design pressure and temperature.  I have only ever seen pipe 108 mm thick on a major gas pipeline in the North Sea and this was 48 inch diam, you will not get seamless pipe 108 mm thick (what are the diameters?), do you mean 108mm (4 inch) diameter.   

 

Welding A333 is straight forward, TIG root. Low Hydrogen elctrodes or Sub Arc for fill and cap where possible.  Welding similar to plain carbon steels except for different filler wire and impact testing of welding procedure test piece due to low temperature service requirement

 

You need to establish wall thickness and then write a suitable PWPS before carrying out WPQ testing and the subsequent writing of production WPS.  .

 

Do you have a welding engineer?  If not please feel free to contact me with any further questions.  I am a UK Chartered Engineer with many years welding experience.

 

Regards

 

Chris

 

(chbluff@gmail.com)

 

 
On Monday, December 31, 2012 11:42:34 AM UTC, N V PRASAD wrote:

Dear Experts,

 

 

Wish you and your family happy new year 2012.

 

We have source  LTCS seamless pipe and flange of 108mm thickness as per the requireemnts given below.  Is it possible to get seamless pipe A 333 Gr. 6 of 108mm thickness.  If so pelase give details and also pelase share your expereince  in welding of such high thickness jobs as per the requireemnts of Chapter Ix  B 31.3.

 

 

 

WPS, Welder and NDT Qualification for High Pressure Piping (ASME B31.3, Chapter IX)

Design Code: ASME B31.3, Chapter IX (2010)

Scope of work:     1. Procuring the material as per the attached material datasheet.

2. Carryout Chemical and HIC tests (as per SP 2041 acceptance criteria: Region 3 service) on the procured material

                                3. Submit proposed WPS (PWPS) for project team approval

4. Cutting and welding the test coupon as per approved PWPS.

5. Carrying out PWHT, NDT, Mechanical tests as per approved PWPS and ASME B31.3, Chapter IX.

6. Submit NDT procedure, technique sheets for PDO approval.

7. NDT technicians shall be approved by PDO

Data Sheet

 

Description			Specified
Design Code		ASME B 31.3, Chapter IX (2010)
Dimensional spec		ASME B36.10
Service		GAS - HIGH SOUR, ONSHORE
Design Pressure		495 bar g
Min. Design Temperature		MINUS 50°C
Max. Design Temperature		PLUS 180°C
Mat		CARBON STEEL FINE GRAINED
Mat, spec		ASTM A333 GR 6
Material Technical Spec.		NACE MR 01-75/ISO 15156
Manufacturing process		SEAMLESS
End Preparation		Beveled, ASME B16.25
Inspection, certificate		ISO 10474 -3.1C

Notes:

1. Pipe wall thickness is calculated based on ASME B 31.3, Chapter IX, clause K 304.1.2.

2. Manufacture and supply of pipe shall be in accordance with ASTM A333 GR.6 and this specification.

3. Impact testing shall meet the requirement of ASME B31.3, Chapter IX, clause K 323.3.1

4. 100% ultrasonic examination as per ASME B 31.3, Chapter IX, clause K 305.1.2

 

5. All pipes shall be procured from PDO approved vendor.

 

MESC No.

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