In an earlier contribution to this discussion,
The3rd Earl Of Derby wrote:

wrote:
[snip]


What you need is not more flow but more pressure. Probably the output
pressures of all your pumps are close to the same.


Total ballcocks, he needs to widen the pipe in the gargoyle somehow.

That would certainly help - but the comments made about pressure are *also*
true.

This type of pump has a performance curve which starts at a finite maximum
pressure at zero flow and ends at a finite maximum flow at zero pressure.
The *actual* operating point for a specific application is somewhere in the
middle - depending on the height to which the water is to be lifted and the
flow resistance presented by the pipework.

The max pressure determines the max height to which you can lift the water -
for it to just dribble out. It sounds as if the elevated gargoyle is using
most of the available pressure to raise the water to nozzle height - leaving
very little in reserve to induce a decent flow rate.

As someone else has suggested, putting two pumps in series may well be the
answer.
--
Cheers,
Set Square
______
Please reply to newsgroup. Reply address is invalid.