Unistrut designed per American Standard Code for Pressure Piping

[Boiler106]

I am a building structural engineer designing some exterior unistrut pipe racks to support (4) 3 inch diameter hot water pipes (no steam) in the southeast USA.

In the unistrut engineering catalog, ive come across this verbiage:

"When used for mechanical supports, load capacities of brackets and fittings should be in compliance with the American Standard Code for Pressure Piping."

The design of the unistrut for the piping seems straightforward enough, but does anyone know what the warning is here? I don't have access to this manual and it seems like there might be additional loads or maybe its just a warning for steam anchors.

Any help would be appreciated

 

[JStephen]

Water hammer can give some impact loading you might not expect, that may be what they are concerned with. But I'm not familiar with the code in question.

 

[HTURKAK]

-I will suggest you to look ( PIP PNC00001 Pipe Support Criteria for ASME B31.3 Metallic Piping ..) for the requirements.

- Pls also look PIP STC01015 Structural Design Criteria..

- The applicable loads are; ASCE 7 typical loads ( DL,LL, WIND , SNOW , EQ if applicable.. ) and friction + anchor loads..
You can find also the applicable combinations at above reference..

 

[JedClampett]

Anvil is who I go to for pipe supports. They have a brand of Unistruts, called AnvilStruts. I don't see a reduction for ASME loads, but the catalogue is huge.
Or you could give them a call. I suspect that the load capacity of Unistruts and AnvilStruts are identical.