> This is for an experimental gray water

Martin,

some years ago when the council were to start charging for
grey water, someone came to me with an impellor fitting
inside a water pipe. I was meant to do a little PICcing so
the grey water could be measured but he never followed
through

ISTR the impellor was either iron or had iron embedded in
it and the PIC was to record the rpm with a Hall Effect sensor

Although we didn't get to a prototype I don't recall any
unsolved issues. The impellor had semi-circular vanes, like a
butterfly valve, so it fitted closely into a round pipe and only a
very slow trickle was not measurable. I think there was some
discussion about a reservoir holding such a slow trickle and
letting it go at a certain weight/volume so it would move the
impellor

There was also the related question of how full the pipe would
be at the impellor and what effect that would have on the rpm.
If memory serves there could have been some sort of vertical
reservoir which released the water through a hole of smaller
diameter than the pipe, so that the calculation was based on time
as well as rpm. ie the water pressure and duration of this 'jet'

Fine on paper theory but we never got to find out how well it
would have worked. Water volumes and drainage of sink vs
bath vs shower for example, size of a reservoir etc

Joe
--=20
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