On Jan 13, 10:26*am, jamesgangnc wrote:
On Jan 13, 1:20*pm, E Z Peaces wrote:



Tony wrote:
E Z Peaces wrote:
Today I saw the town maintenance man repair the elbow in a 2" plastic
water pipe, two feet deep in sandy soil.

He said water pressure had separated the joint. *His solution was a
steel stake on either side of the joint. *That's what he had before,
and it failed.

It seems to me that enough pressure to separate a joint could also, in
time, move a stake in wet, sandy soil. *Is that the best way to brace
an elbow undeground?

I'm curious what kind of plastic pipe it is and is it glued, clamped, or
crimped to the elbow?

I saw only that the plastic is white. *The original was apparently
glued. *What if the pipe was wet when they glued it years ago? *They
clamped a copper elbow in place of the plastic one.

Clear about 6 inches in all directions around the elbow and fill it
with cement.

Concreting completely around an elbow in 2" line with 40 psi static
pressure is totally unnecessary, the wrong solution here. Even if a
thrust block was required, completely encasing the fitting is frowned
upon.

If water hammer is a potential problem, better to mitigate with a
properly sized and installed water hammer arrestor than "brute forcing
it" with concrete.

Thrust blocks are generally not needed for piping below 4"...plus 40
psi static pressure is a pretty wimpy system.

My bet is on a bad glue joint.

cheers
Bob