Pipe Coupling Strength
Pipe Coupling Strength
(OP)
A question came to mind today. Say a pipe is threaded on its outer diameter in order to couple to another pipe to achieve a desired length. Material is taken from the pipe to make the threads which weakens the pipe, and as I understand it pipe threading is tapered, so that would take even more material. However, it is then reinforced with a coupling. How does this coupled pipe compare to one single piece that runs the desired length?
Say this pipe is used for a guard railing, and no fluid ever passes through the pipe. Let's say it is schedule 40 pipe and I am only concerned with the outside forces that may act upon said pipe. Is there a rule of thumb for the strength at the point of coupling or perhaps someone is aware of a simple calculation that can satisfy my curiosity.
Say this pipe is used for a guard railing, and no fluid ever passes through the pipe. Let's say it is schedule 40 pipe and I am only concerned with the outside forces that may act upon said pipe. Is there a rule of thumb for the strength at the point of coupling or perhaps someone is aware of a simple calculation that can satisfy my curiosity.





RE: Pipe Coupling Strength
RE: Pipe Coupling Strength
Where is the coupler at? The rail/piost junctions or the middle of the (horizontal) railing?
RAF
RE: Pipe Coupling Strength
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RE: Pipe Coupling Strength
RE: Pipe Coupling Strength
Pipe joints are intended to carry fluid under pressure, not moments.
Misapply them and you're on your own.
Mike Halloran
Pembroke Pines, FL, USA
RE: Pipe Coupling Strength
If you're interested in using couplings to provide removability for vertical posts, consider using something more standard like Kee Klamp http://commercecenter.keeklamp.com/Main.asp . No threading or welding required, meets OSHA-required design loadings, and permits the use of galvanized pipe or round HSS (i.e. galvanized on both the OD and ID to minimize the risk of hidden corrosion. Worth their weight in gold in my opinion.