Page 61 - Commercial Catalogue 2011

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4. If more than one pump is found to be suitable for the application, then refer to the power ratings.
The P1 (or power in) is an indication of how many kilowatts the pump will draw.A lower value will
correspond to lower running costs.
5. Float Switches – are recommended as a failsafe so that the pumps are switched off in the event of a
drain down.This will prevent any damage to the pump through running dry, and will prevent any "gas
bubble disease" in livestock as a result of super-saturation of air in the water.
The following points should be taken into consideration when a pump is to be installed:-
1. Pumps will generally operate better if they are installed so that they have a flooded suction line (i.e.
water enters the pump by gravity, thus eliminating suction lift).
2. If two pumps are to be installed together, it is imperative that points 2 and 3 on p.60 are followed.
3. Prior to commissioning a system, check that all solvent weld joints are in fact glued, and all unions
have their associated o-rings and are hand tight.
4. Air leaks should be checked for when commissioning a system.Air leaks can lead to super-saturation
of gases in the water which is responsible for "gas bubble disease" in livestock. If it is not possible to
test the total dissolved gases (TDG) of the water, a method of picking this up is by shining a torch
into the pump lid and looking for small air bubbles. Refer to point 3 above if they are found to be
5. Ensure that the suction line is situated in the deepest possible point of the sump to avoid any air
entering the pump.
The following parts and fittings are recommended for any pump installation:-
a) Suction strainer (1) – to avoid any
debris entering the pump which may
cause physical damage or a
restriction in the suction line.
b) Valves – it is recommended that a
valve is installed on both the suction
(2) and the delivery side (3) of the
pump so that it can be isolated and
changed over without any water loss
from the system.
c) Non return/check valves (4) – placed
on the discharge side of the pump
below the isolation valve.This will
prevent water loss from the system if a pump fails, and will prevent the pump running backwards
if two pumps are plumbed into the same delivery line.
d) Pressure switches (5) – should be installed on the delivery side of the pump before the non
return, and can be wired into an alarm system to alert you to a pump failure.