Recent content by cadiehl

This is located at a meter station, outside of the pigging limits. I am going to do it with a reducer. The client has agreed to this method. No custom transition piece required. Thank both of you for your invaluable input. CAD

I'm doing a pipeline project. Only my second one. Been a piping designer in shipbuilding and various plants for over 30 years. I have a situation where I have 10" STD wall (.365") pipe going to an 8" SCH80 wall (.500") pipe. I am told I need a transition piece. I just figured this would be a...

I have the same problem, says my wife. This has been a pretty enlightening discussion. Surely appreciate your input.

Little sarcasm there BigInch? LOL.... I think the test is just to ensure there are no blatant fab screw-ups. Other than that, useless, I agree.

Dcasto, The pipe is NOT tested by the pipe manufacturer to a level that meets B31.3. Nor is it required unless you request and pay for it to be done. It must be tested in accordance with B31.3 prior to installing in the field. In this case it's a 10 minute pressure test. The pipe manufacturer...

Gots me some clarity... thanks BigInch.

Not flying blind MF... as you can see, opinions differ across the board on this subject. The same goes with the engineers I have spoken to around here.... even if this was a hypothetical situation, the answers would not be the same from every engineer you asked. Some say that pressure testing is...

Yes Steve. I just found that the A312 spec mandates a 30 second pressure test on all piping at the factory. However, the pipe segment would require a 10 minute pressure test to meet B31.3. That can done at the mill or on site, obviously. I think I have my answer. I think. Unless someone comes on...

Now I'm lost also. I just want to know if the CODE requires this 10 foot section of new piping to be pressure tested prior to welding it into the system. I don't care about good engineering practice, client requests, etc.... that is a totally different issue. Does the CODE require it? Or not...

Thank you Biginch.

I know it "can" be tested. I am asking if it is "required" to be hydroed or pneumatically tested PRIOR to welding it into the system. It's just a straight 10' long piece of stainless, no fittings. It will be buttwelded into a system that cannot be pressure tested. So, it will have 2 closure...

Thanks BigInch.... what if there are no fittings welded to it... just a straight run of pipe. Does it still require testing prior to welding it into the system?

So I understand the application of Golden Welds. Let's say I am replacing a 10' long damaged segment of 3" ips piping in a 600 psi Liquefied Natural Gas system. There is no feasible way to pressure test the 2 buttwelds required to perform this task. Am I required to separately pressure test the...

Can someone please review that attached sketch and tell me if I am interpreting section 5.3.1 of STS-1 concerning strake pitch correctly? Thank you, CD

Zapster, I think we got it. The OCV 3330 Altitude Control Valve may be perfect for what we need. It is all done hydraulically. No electric, no pneumatics, from what I can tell. Time to make some calls I guess. Thanks!!