Jerry Avins wrote:
mm wrote:


This is a ranch, man. If there is water hammer, they'll hammer back.
8-)

Ranch, shmanch. If there's a serious water hammer it can blow a fitting
off the pipe. There's more than 300 lb of water in 400' of 1.5" pipe.
How fast do you think you can stop it without breaking something?

Stretch in the pipe wall helps considerably. With polyethylene pipe, t
can reduce the peak pressure to one quarter, down from the 1000 psi that
steel pipe might generate.

There's 37.5 gallons in out hypothetical 400' run of 1.5" pipe, weighing
about 300 lb. At 5 gpm, it flows at 100 fpm, or 17 ft/sec or over 5 mph.
If you slam a 300lb weight into a cinder-block wall at 5 miles an hour,
would you bet that the wall stands? I wouldn't!

Jerry
--
Engineering is the art of making what you want from things you can get.

There shouldn't be any more problem of water hammer with that set up
than with a standard system with long runs of pipe. I was on a
community well system (40-60 psi) with a 1/4 mile run to the well for
me. Never had a hammer. No difference in flow in the pipe or dynamics
of possible water hammer if the pipe is horizontal or vertical, the
flow is the same.

Harry K
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