"len brauer" wrote in message
...
g'day don,

is it a submersable pump or above ground pump?

i am no expert but just some things i have been told at times:

if it is above ground then the bigger the pipe coming into the pump
tghe better 2" is usually used. this reduces friction and drag. it is
also better for the pump if you have 2" going out as well for the same
reasons.

also do you have a non-return valve fitted on the outlet side this
could help in keeping initial pressure in the line.


I agree with all but the non-return valve, this must be placed at the bottom of
the suction line, normally refered as the foot valve, although both valves
(foot, non-return/check) are identical in principle, inline valves are usually
refered to as check or non-return valves and are usually spring assisted, but
the foot valve as stated previously is placed at the foot of a suction line and
is not spring assisted, only by gravity and the head of the fluid.

Regards
Gerard