Heat input in wedling pipelines

[tfdavid]

Anyone knows what shell be the maximum heat input that can be produced in welding fittings to pipelines under pressure (natural gas flowing in the pipeline)? I have the Welding procedure records for those welding productions, where I can calculate the heat inputs based on the I, V and welding speed, but those aren´t the values for wich we shell base on because the conditions during welding are different from those that there were in the qualification.

 

[SJones]

thread809-269024

The maximum heat input is that qualified with the allowable tolerances and stated on the WPS!!

Steve Jones
Materials & Corrosion Engineer

http://www.oilandgaspeople.com/cv/11499664

http://www.linkedin.com/pub/8/83b/b04

 

[PipinFool]

tfdavid,

You say the operating conditions of the pipeline are different than the values in the welding procedure? In what regards? (flow rate, carbon equivalency, wall thickness etc.)

 

[hweber]

for in service repair, i believe somewhere in API 1104 annex B there is some statement about you must develope a wps with simulate working conditions of the pipeline.