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Seismic Decoupling of branch lines from run lines

Seismic Decoupling of branch lines from run lines

Seismic Decoupling of branch lines from run lines

(OP)
We are using a seismic decoupling criteria of 25:1, where if the branch pipe to run pipe moment of inertia ratio is 25:1, we seismically decouple the branch from the run in the run pipe analysis. However, the branch pipe analysis apparently needs the seismic spectra input specifically for the run/branch interface. Is there any piping analysis software that can provide the response at the run/branch interface? We use AutoPIPE.

RE: Seismic Decoupling of branch lines from run lines

Can I ask why you need to decouple the main line from the branches? Is this a code requirement?

The movement of the main at the connection can have huge effect on the branch loads.

PC power is cheap, why not just run a whole model?

John Breen has talked about this.
http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=...

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