Re: [MW:5588] Distance between welds

There seems to be few ambiguity in the information provided.

 

1. Given Design code is ASME B 31.3 & item is a part of LPG/LNG Pipeline scrapper/ signaller. Normally these are designed either as per ASME B 31.8/31.4 or Sec VIII div 1 or 2.

 

From the drawing, for 8"x 4" barred tee, for the branch connection (4" size), pup piece material is ASTM A 333 Gr 6 & I believe, the thickness is 13.59mm (considered minimum WT as shown in the drawing) & the length is 125mm. (whereas in you statement it is mentioned as API 5L X60 PSL2 created confusion).

 

If the client species the minimum distance required 6xWT, pup piece required is 13.59mm X 6 = 80.94mm < 125mm length is provided- Where is the problem?

 

If you are mentioning about the 8" pup piece attached the main (run pipe) with WT 15.9mm, the minimum distance required is 15.9x6= 95.4mm only < 125mm (actual provided in the drawing is 400mm, whereas you had mentioned 125mm created confusion).

 

 To me, the pup piece can be welded (to barred tee) with out any problem & within client specification.

 

Regards,

Sanjeevan

 

 

----- Original Message -----

From: manpreet

To: materials-welding@googlegroups.com

Cc: rutvikdixit@yahoo.co.in ; p.goswami@quickclic.net ; Amritas2001@gmail.com

Sent: Saturday, June 12, 2010 11:17 AM

Subject: [MW:5551] Distance between welds

Dear All

My case is:-

code of construction- ASME B31.3
LPG/LNG pipeline

For Pig signaller, we have to weld a barred tee in the pup piece attached with valve.

pup piece material- API 5L X60 PSL2
barred tee- ASTM A860 WPHY 60

length of pup piece is 125 mm. Kindly find the attached drawing for welding connection.

Acc. to Australian std distance between welds should be 6 times of thickness, in this case we r not able to weld.
PLS confirm looking at the drawing, can the welding be performed?

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