Steel Pipe Restraint - Necessary for This Application
Steel Pipe Restraint - Necessary for This Application
(OP)
We are replacing a a very long 42" welded steel pipe header at a water treatment plant with the same. The header is in a gallery (not buried) and carries water from flocculation to sedimentation tanks - this is gravity flow with no bends (probably about 6' driving head). Because of the sequencing necessary to keep portions of the line in service, couplings are being shown to connect new segments to existing welded steel segments.
Contractor is asking for harnessing (tie-rod) details, and client is asking why is that necessary? It seems harnessing is always just an assumption to put it in to be safe, but there is no thrust to speak of, pipe flows less than half-full, and the cost could be come extensive considering the length of the header. Would harnessing really be necessary in this application?
Contractor is asking for harnessing (tie-rod) details, and client is asking why is that necessary? It seems harnessing is always just an assumption to put it in to be safe, but there is no thrust to speak of, pipe flows less than half-full, and the cost could be come extensive considering the length of the header. Would harnessing really be necessary in this application?





RE: Steel Pipe Restraint - Necessary for This Application
If you want the best illustration of this get AWWA Publication M11.
RE: Steel Pipe Restraint - Necessary for This Application
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RE: Steel Pipe Restraint - Necessary for This Application
A few years ago I was asked to help on a problem at a new high lift pump installation in a brand new pump station. The working pressure in the pump was about 240 psi and the discharge pipe was about say 36" in diameter. If you work the numbers out the thrust is very high. The consultant had a rigid vic coupling between the butterfly valve and the check valve. The pump went for a walk and the pump discharge pipe went out of alignment. I advised the owner that a rigid vic coupling is not the same as a flanged joint. The internal pressure in the pipe will cause the pipe to move until the rigid vic coupling catches on the built up pipe shoulders and that is the reason why the pump went for a walk. I advised the owner to have the consultant install tie rods between the butterfly valve and the check valve across the vic coupling. Problem solved.
RE: Steel Pipe Restraint - Necessary for This Application
RE: Steel Pipe Restraint - Necessary for This Application