On Jan 13, 9:55*pm, DD_BobK wrote:
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- Hide quoted text -

- Show quoted text -

I was going for fast and simple. Beats digging it up every 6 months.