In article , "Warren"
wrote:

paghat wrote:
Should be PSI, pounds per square inch capacity. DPI applies to Photoshop
which I was using all morning. A hose that has a high PSI number will
likely never burst under water pressure. Cheap hoses at 100 or 150 PSI
could easily burst if the fawcett was turned on all the way. So
manufactuers like to leave that information off the packaging making it
impossible to judge the strength, though we can assume if they won't
reveal it it's insufficient.

Holy cow! If you've got that kind of pressure, then somebody left off a
pressure
regulator on your line. Typical residential water pressure is only about
60 psi.
Higher pressures are either reduced before the meter, or a special commercial
meter would need to be installed.

Residential water is frequently 100 psi, but a hose that claims it will
not rupture until it reaches 150 to 200 psi will probably burst its second
year at a much, much lower psi because weakend by normal usage, UV
exposure, heat, & cold. It might spring a leak even if it's hardly ever
used. Worse, drip irrigation hoses from places like Lowes & Home Depot
will burst at 30 or 40 psi & some of them could only be safely used at 10
or 20 psi which is pretty hard to sustain without a pressure regulator, &
even a hilltop house with the world's worst water pressure will eventually
bust those hoses, a real nuisance if someone has gone to the wasted bother
to bury a couple hundred feet of the stuff & it keeps rupturing even at
low psi, even with a pressure regulator.

Just about everyone who has bought such things at Home Depot or Lowes
knows what it's like to bust a hose even on its first day of use with
pressure from an average outdoor spigot of 50 to 100 psi. When you want a
hose to last for life the psi rupture rating will be in the hundreds & it
can even be hooked up to a pressure pump for washing the house or sidewalk
-- with normal use it'll still be intact thirty or fifty years later, but
no vinyl hose ever will last that long.

The real stinky thing is a bad hose can be rated 150 psi which will mean
its rupture point not its safety point, & it is really only useable at
half that psi or less. The Craftsman all-rubber hose is rated 165 psi, but
that is for actual continuous use; it has a separate rupture rating which
is 500 psi. That's what's needed when we're talking "the last hose you
will ever have to buy." Nothing less will last.

-paghat the ratgirl
--
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