Welding on live equipment - burn-through calcs

[ajcousins]

Hello. I am in the middle of writing a procedure/policy for welding on live equipment in a chemical manufacturing facility. From past experience, we used a software (E2G SagePlus) to help with heat transfer during welding to determine the heat input and related welding variables in order to prevent overheating and burn through of the in-service piping/equipment.

Per API 2201 Section 6.1 references the Edison Welding Institute and Battelle Laboratories documents containing information regarding evaluating for this; however, I wanted to check with other to see what guidance, etc. might also be useful for writing such an engineering procedure for my plant.

Thank you!

 

[LittleInch]

There is a welding forum under structural engineers - try a search in that forum?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[akpipelineengr]

The Battelle work is the industry standard and the basis for the calculations implemented in E2G's SagePlus and PRCI's Hot Tap Toolbox.

Most operators I've worked with use a simple minimum wall thickness limit for online welding (often 0.188" or 0.250") that is conservative for their process conditions. For a policy or specification, a minimum wall thickness makes a nice clean requirement... anything less and an engineer needs to do burn through calculations for the specific pipe and process you are working on.

 

[KevinNZ]

Search posts for 'hot tap". Lots of discussions.