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Pipe Load factors

Pipe Load factors

Pipe Load factors

(OP)
What load factor(s) is used for the design of pipe hangers supported from reinforced concrete slab per code?

Thank you

RE: Pipe Load factors

What kind of code You use?

RE: Pipe Load factors

(OP)
There is a disagreement in our office as what the load factor for a pipe filled with water is.  Some want to apply 1.2*pipe DL + 1.6*water weight, others suggest appling one factor 1.4, while a third group recommends 1.6*(Pipe DL+Water).  I am looking at ICC which refernces ASCE7.

RE: Pipe Load factors

Seismic might control??

RE: Pipe Load factors

Agreed with Mike, seismic may control.

But, just looking a dead and live loading, I would consider 1.2(DL + water). Since everything pipe full of water is known, i consider both as dead.

With that said, one must consider any thrust in bends etc.. as a load on the hangers also.

RE: Pipe Load factors

The IBC and ASCE 7 define live and dead load. Fixed service equipment including plumbing stacks are dead loads. So, it is fairly easy to justify the pipe weight as dead load. I would also consider the weight of water in the pipe as a dead load. A pipe can only hold so much water. More weight may be added to the dead load to account for valves and appurtances before using a live load factors.  

RE: Pipe Load factors

Look at the load combinations in Chapter 2 of ASCE 7-05. Water fits the definition for "F = load due to fluids with well-defined pressures and maximum heights".

So for Strength Design (LRFD), both the 1.4 and 1.2 factor should be used.

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