Minimum Pipe Length Between 45 Bends
Minimum Pipe Length Between 45 Bends
(OP)
When making a 90 degree turn in pipe and using two 45s, is there a standard minimum pipe length for PVC (mechanical joint ductile iron fittings)? Does the length vary depending on the diameter of the PVC?





RE: Minimum Pipe Length Between 45 Bends
RE: Minimum Pipe Length Between 45 Bends
Three feet should be fine for the minimum distance between fittings on pipes up to 12" diameter. I think you need to go to four feet for 14"-16".
You can find dimnesional information on restraints at ebaa.com.
RE: Minimum Pipe Length Between 45 Bends
You can probably get by with as low as 6-inches, but it will depend somewhat on the specific mechanical joint restraint that you will employ.
http://www.ebaa.com/PDF/Brochure.2000PV.pdf
RE: Minimum Pipe Length Between 45 Bends
All that being said, I guess there could be some lesser concern with say DR13.5 or 14 4" pipe at very low pressure than with much larger diameter pvc pipe at very high and cyclic pressures? [Remember also if you put the two 45's very close together, you essentially have a 90 degree pipeline bend, and the "45" length of restraint in either direction off that compound bend may not be adequate or safe).
RE: Minimum Pipe Length Between 45 Bends
rconner - Ouch to breaking both legs!
RE: Minimum Pipe Length Between 45 Bends
Here is a brochure describing the history of the megalug for ductile iron pipe:
http://www.ebaa.com/PDF/Connections.DI-02.pdf
The wedges on the megalug are typically 4 to 5-inches apart which gives an indication of the zone of influence of the restraint on the pipe.
I agree with rconner that it is best to call the manufacturer of the restraint that you plan to use and get technical advice.
RE: Minimum Pipe Length Between 45 Bends
htt
Steve