[Tagging] Fire hydrants vs suction_point

Kevin Kenny kevin.b.kenny+osm at gmail.com
Fri Aug 18 03:17:34 UTC 2017

On Thu, Aug 17, 2017 at 9:28 PM, Warin <61sundowner at gmail.com> wrote:

>> there are always exceptions. not far from me, there's a traditional
>> hydrant of the type normally used with pressurized systems, but
>> it's sourced from a pond. the reason is that the pond is elevated, some
>> distance from the road, and they need to keep the barrel empty
>> when it's not in use for the usual reasons.
> That would officially be called and signed a 'Static Water Supply' in
> Australia.

A dry hydrant is a standing pipe with a coupling for a hard suction
hose that is sourced from an unpressurized water source.

A static water source is any source that's not under pressure, such as
lakes, ponds, streams and swimming pools. In addition to requiring a
hard suction hose, drafting from a natural static source generally
requires floats, intake strainers, ropes and braces.

Most static water sources are natural sources of standing water, and
only a few are equipped with dry hydrants.

There are also dry hydrants that are fed from standpipes somewhere
else, by hooking up a fire pumper at the standpipe. They are often use
where the protected area is higher than the municipal source can lift,
or high enough to cavitate the water when pumping.

Neither of these should be confused with a 'dry barrel' hydrant, where
the valve is in the ground below the frost line and the riser is
equipped with a drain so that it will not freeze. The case that
Richard is describing is a gravity-fed dry barrel hydrant.

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