pipeline stresses 1

[mae1133]

I'm working on a project where I need to provide forces from a piping system to a structural engineer to design the support system. Attached is an example of one of the supports being designed. The fluid being transported is water at 20 psi. The velocity of the water is 9 fps. This is in an open system where flow is transported from one open tank to another. The piping is welded and flanged SS. Any valves on the system will be butterfly valves so slow closing. I know this should be quite straight forward, but can someone show the methodology in calculating the dynamic forces that the supports will need to support? Are dynamic forces a concern? Thanks

 

[MJCronin]

1) Find the piping design code that you must be in conformance with. Is it ASME B31.1 ?

2) Perform a detailed stress stress analysis of the system between anchor points using a program such as CAESARII. This analysis will qualify your system configuration, calculate maximum piping stress levels and develop pipe support loadings.

3) Be aware that, just like doing analysis of a building steel frame, not every configuration that you can draw is acceptable and code compliant.

4) Be aware that Schedule 10S piping has very little strength and the span that you show (24 feet for 20"-SCH10 SS) in you sketch seems excessive.

https://www.nickelinstitute.org/~/m...esforStainlessSteelinPipingSystems_9024_.ashx

OR

You can hire an experienced engineering design firm and go with their recommendations...

MJCronin
Sr. Process Engineer

 

[LittleInch]

Well first off define the type of support here - simple sliding support or anchor or line stop or guide? Makes a big difference in the horizontal loads which is what I guess your structural guy is interested in as vertical load should be quite easy.

Then work out how much it's going to move. I can't see 3m/sec water giving you any significant transient loads that you don't have anyway from expansion movement.

A simple piping stress model will spit out all these numbers for all the supports.



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

 

[mae1133]

Unfortunately, I do not have access to pipe stress analysis software such as CAESARII. This is why I was trying to determine the methodology in doing it by hand.