Virgil Rudd
Structural
I have a 70-foot trussed pipe bridge that will eventually be loaded with 3-levels of piping, some liquids, some gas. What is the acceptable amount of deflection in such a bridge?
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Acceptable Deflection in a Pipe Bridge 1
- Thread starter Virgil Rudd
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I just finished design of a 120' pipe bridge. The mechanical on the project wanted maximum 1/8" deflection. I told him that was impossible.
I'll echo ONCE20036, ask your pipe guys. There is a decent chance they will need to slope one or more pipes. On my bridge we ended up sloping it to provide drainage to a KO.
Piping is pretty resilient and a properly designed pipe run should be able to take L/240 for deflection.
I'll echo ONCE20036, ask your pipe guys. There is a decent chance they will need to slope one or more pipes. On my bridge we ended up sloping it to provide drainage to a KO.
Piping is pretty resilient and a properly designed pipe run should be able to take L/240 for deflection.
racookpe1978
Nuclear
More often (from a piping perspective) is is a very important matter of WHERE the deflection is and HOW MUCH deflection (bending) is expected. Drain points (constant downward slopes to a very specific point, vent points or vapor protection requires constant upward slopes to a different point, sewage or slurries require specific max and min slopes to move the entrained solids to the end of the pipe, etc.
The pipe itself and contents are usually very predictable loads. (Surge and water hammer unpredictable but massive loads.) Expansion and contraction require specific large geometric bends and straights and anchors, but it is drains and vents and cargo capacities transfers that force slope limits on the supports. And a pipe bridge is just an expensive support, as far as a pipist cares..
The pipe itself and contents are usually very predictable loads. (Surge and water hammer unpredictable but massive loads.) Expansion and contraction require specific large geometric bends and straights and anchors, but it is drains and vents and cargo capacities transfers that force slope limits on the supports. And a pipe bridge is just an expensive support, as far as a pipist cares..
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Virgil Rudd
Structural
Thanks to all for your input. Well noted.
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