Hrsg superheater- T-23/T-91/thick 2.25 cr- preheat methods

[rmillercwi]

In a jam. Existing 1.5" .135 t-23 welded to t-91 ( a stub) welded to heavy wall 2.25 cr upper header.

Every tube across panel. Forced outage.

Doing it by the book. Well versed in the specifics. Electrical resistance preheating is a huge production hog. Doing it on the header as well as the tube side.

I have read most of what's out there. All recommend er preheating.

The question:

If I keep heaters on the header... Can I propane pre heat the tube? Thinking adding tcs to the tube side, hand held propane, no flame on the tube, temp sticks.... All that.

Will it work?

 

[weldstan]

Air propane torch preheating has often been used when welding tube to tube as you describe.

 

[metengr]

I agree with weldstand. Why would a T91 stub be used between a T23 and T22 header??? Makes no sense. Are you sure the header is not Gr 91??

 

[rmillercwi]

^ Long story. We requested T-23. Unfortunately the T-23 we received was not of current code case and the AI booted it. We were also struggling to find T-23 tig wire. T-91 was the next best alternative.