Allowable Vertical Span
Allowable Vertical Span
(OP)
Folks:
I see plenty info on horizontal spans and distance between supports, but nothing so far on what I need.
I will be tasked with installing some small diameter vent piping (1" - 2") and would like to get input from the more experienced people.
Q1) Is there a guideline to use for determining how much pipe can extend beyond the last support?
I will likely have a uni-strut support about 3 feet up in some cases and may need to extend the vent 10 feet beyond that. There will not be any fittings, valves, etc other than a u-bend at the end to prevent rainwater from entering the line.
Thanks
I see plenty info on horizontal spans and distance between supports, but nothing so far on what I need.
I will be tasked with installing some small diameter vent piping (1" - 2") and would like to get input from the more experienced people.
Q1) Is there a guideline to use for determining how much pipe can extend beyond the last support?
I will likely have a uni-strut support about 3 feet up in some cases and may need to extend the vent 10 feet beyond that. There will not be any fittings, valves, etc other than a u-bend at the end to prevent rainwater from entering the line.
Thanks





RE: Allowable Vertical Span
I generally do not locate piping where this is not possible. If I did, I probably would support it in the same span that I do for horizontal - which depends on the piping material.
RE: Allowable Vertical Span
You might be able to assume the pipe behaves as a cantilever beam under a uniform load (for wind) or a point load (for impact by forklift). Hope that helps.
Don't forget vertical thrust if it's of a high enough magnitude...
RE: Allowable Vertical Span
John Breen, has a excel spreed sheet that has this information enclued, Do advance search John Breen. Also may be poster on http://www.pipingdesign.com/
L S THILL