Pipe supports, welded directly to pressured piping
Pipe supports, welded directly to pressured piping
(OP)
Hi,
I looking for help on dealing with my pipe welded to supports problem. I have pipe welded directly to the supports, the pipe sizes very from 6-36" and all should be sch 80. I'm trying to help put together an inspection plan for the welded pipe and I was wondering if anyone had any ideas on the technology that should be used, frequency, etc...
The welded pipe all occurs on a deliver header and was build by the plant. I currently do not have their construction records, nor do I know what specification the piping was built to.
I can tell you that the header is operated to less than 50% SMYS and the typical pressure it sees is 1200 psi.
Regards,
Ryan, EIT
I looking for help on dealing with my pipe welded to supports problem. I have pipe welded directly to the supports, the pipe sizes very from 6-36" and all should be sch 80. I'm trying to help put together an inspection plan for the welded pipe and I was wondering if anyone had any ideas on the technology that should be used, frequency, etc...
The welded pipe all occurs on a deliver header and was build by the plant. I currently do not have their construction records, nor do I know what specification the piping was built to.
I can tell you that the header is operated to less than 50% SMYS and the typical pressure it sees is 1200 psi.
Regards,
Ryan, EIT





RE: Pipe supports, welded directly to pressured piping
RE: Pipe supports, welded directly to pressured piping
RE: Pipe supports, welded directly to pressured piping
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying " Damn that was fun!" - Unknown>>
RE: Pipe supports, welded directly to pressured piping
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pipe supports, welded directly to pressured piping
The first appears to be a "Shoe" welded to the pipe. This is very common.
The second appears to be a "Guide" to control the positioning of the pipe. Also very common.
The third appears to be a rigid "Base Support" welded directly to an elbow. Again, a very common situation.
These are all referred to as "Secondary Pipe Supports. (Primary pipe supports are the ones designed, engineered and installed by the Structural Department.) Secondary pipe supports are designed and engineered by the piping department and installed as a part of the piping installation sub-contract. If you are going to look for any documentation for these secondary pipe supports you need to look in the piping files.
Do you or others there have a concern about this sort of thing and if so what is it?
RE: Pipe supports, welded directly to pressured piping
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pipe supports, welded directly to pressured piping
I suggest that you go here:
http://www.pipingdesigners.com/Training.htm
In "Section III" there are two articles about pipe supports. I think you might find them both informative and interesting.
RE: Pipe supports, welded directly to pressured piping
As for the inspection, I don't know. It should have :s
What we are worried about is cracking. Not so much of the weld but the pipe weld. BigInch is right. Canadian code does not let you weld to pressure piping, which half of our pipeline is designed to.
If this is a common practice how do you inspect it? UT? X-ray?
RE: Pipe supports, welded directly to pressured piping
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying " Damn that was fun!" - Unknown>>
RE: Pipe supports, welded directly to pressured piping
RE: Pipe supports, welded directly to pressured piping
I'm not very happy with the record keeping.
Have there ever been any failures because of this type of situgation.
Sorry, about all the questions. My background is pigging (MFL) but I have been put in charge of other projects now.
RE: Pipe supports, welded directly to pressured piping
Not a pipeline code then.
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Pipe supports, welded directly to pressured piping
Nigel Armstrong
Lloyds Register
Independent Verification Body Surveyor
RE: Pipe supports, welded directly to pressured piping
Welded appurtenances are part of the piping engineer's responsibility. You will note that none of your photos shows the pipe supports welded directly to the structural steel members. Those members are the responsibility of the structural engineer and it is the responsibility of the piping engineer to communicate the piping loadings (transferred through the welded appurtenances) to the structural steel for the structural engineer's evaluation of the effect of the loadings on "his" structural steel.
Have a look at the book "Piping Guide", Syentek, David R. Sherwood and Dennis J. Whistance, ISBN 0-914-08219-1, Figures 2.72A and 2.72B for some examples of what you photographed.
Regards, John