Need clarification about API 1104

[joshi jaydeep]

Dear all,
 

API 1104 Clause No. 6.2.2 (e) mentions about the 'Pipe wall thickness grouping' as an essential variable.
 
If we have a requirement of welding a sleeve on Pipe (as in-service weld), do we need to consider the Sleeve thickness as an essential variable?
 
I believe API 1104 code is silent about the Sleeve thickness.
 
Please guide.
 
 
 Thanks and Regards,
 

Jaydeep Joshi |Welding Engineer, TDW India Limited

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[James, GeraldJayakumar]

Sleeve longitudinal welding  & Branch welding will be covered by API 1104 clause 6.2.2.e

 

In Sleeve to Pipe Fillet weld, the wall thickness is not an essential variable according to API 1104 clause B2.2.1.3 Appendix B

 

J.Gerald

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[Fitria Rahman]

Yes, B.2.2.1.3 does not specify that wall thickness is an essential variable. But first of all, wall thickness of the pipe should be considered against thermal severity of the piping during in service. accepted minimum thk is 4.8mm (0.118").

Let this helps

Rgds,

2011/3/1 James, GeraldJayakumar <GeraldJaya...@fwuk.fwc.com>

[Ashique]

Kindly help me

We need to qualify a new PQR for 66" 18mm thick in service welding. Please note that our sleeve thickness is 20mm. the longitudinal welding with backing strip and direct run pipe welding is fillet weld. Kindly help me the PQR pipe thickness requirements since the thickness range qualification is silent in API 1104 for in service welding.

Ashique.K.V