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Pipe support material

Pipe support material

Pipe support material

(OP)
Hi
 I a want to know that can we use same pipe shu material (Shu i.e. inverted T welded to pipe directly) for hot insulated carbon stell pipe and stainless stell pipe? Any criteria behind it?
 
Sachin  

RE: Pipe support material

For carbon steel line, you can use carbon steel for shoes. But for SS pipe, if you use carbon steel for shoes, it will have bimetal welds on the pipe. We usually try to avoid bimetal welds on piping. So for the pipe shoe, you can use clamped ones (the clamps will be SS).  

RE: Pipe support material

You could get serious problems with stainless pipe and carbon steel shoe. Don't do it. If you need a welded carbon steel shoe, use a stainless wrap plate welded to the pipe, and weld the carbon steel shoe to it.

RE: Pipe support material

Unless it's an anchor or stop, I should use clamped shoes.
CS shoe on ss pipe with a ptfe or neoprene layer in it.

Greetings

RE: Pipe support material

Don't just weld inverted tee's to a pipe to act as supports without investigating the stress levels around the attachment.

RE: Pipe support material

(OP)
Thanks a lot, ok it is concluded that cs shoes can't be directly welded to SS pipe but is it because of metallurgical reasons (chemical comp. of mats.) or differential thermal expansion coefficients or difficulty in welding process?

Sachin

RE: Pipe support material

.......also the SS material has a different coefficient of expansion than does the CS material - so if there is a significant temperature involved the local stresses at the (mismatched material) welds will be high.  Welded-on supports that are not completely insulated act as "heat-sinks" too and this will exacerbate the local stress problem. Please see PFI ES-26 regarding welding appurtenances to pipe.

John.

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