On Jan 31, 9:15 am, "dpb" wrote:
On Jan 31, 10:38 am, wrote:



On Jan 31, 11:07 am, "dpb" wrote: On Jan 31, 8:52 am, wrote:
...

Is there a way for a manual pitcher pump and a submersible pump to use
the same casing? I asked my well driller and he said he doesn't know
how to do that. In my own naive way I would think the pitcher pump
could use even the same drop pipe.

How, in your naive way, would you propose to do that?

First I would assume that water can be drawn thru the non-operating
sumersible pump. Then what you would need is a tee off the drop pipe
near the top: One branch for the normal water line, one branch for
the
pitcher pump. Then you would need some sort of magic check valve
on the pitcher pump branch that would allow suction from one side
(pitch pump) but disallow flow if there was pressure from the opposite
side
(submersible pump). Is that naive enough?

...

I think so... I asked more in a rhetorical way as I figured that
thought process would lead to a number of questions...

As someone else already noted, at 145-ft, one would assume the water
table is at the highest something like 80', far more likely 100' or
even deeper. I don't know of any such pump that has such lift so you
would have to rely on the standing head in the pump outlet pipe and
the footcheck valve to not let it drop below the pickup point. Then,
the assumption of any sizable volume being picked up around the pump
impellers and housing in the pump is not a very good one -- the
effectiveness of a pump relies on close tolerances there to provide
the outlet pressure and lift. Then, when the pump isn't running, the
above-mentioned check valve has to remain closed or the level will
drop slowly and when it is closed, there isn't a path at all from
below and it won't open w/o the pump head pushing it open -- in
essence the reverse of the check valve you need at the top. IOW, the
best you could possibly hope for imo is whatever standing water there
is from the top of the water column to the maximum depth of the manual
pump's lift and when this volume was exhausted you'd again be w/o
water until had power to recharge that volume.- Hide quoted text -

- Show quoted text -

Nope.

1. The suction pump will suck the footvalve open - it opens when
pressure on the outlet side is less than that on the other.

2. A suction pump working on a pipe 80 ft long (for example) will
only exhaust the top about 26 ft (at sea level). In reality, it
probably won't do more than pump a cup full or two before sucking a
vacuum.

No 'suction' pump will draw water from over 26' (sea level) above the
static water level no matter how it is hooked up.

Harry K