Table of Contents
Advertisement
Section 5....................................................................................Installation
pipe diameter is desired directly upstream of the suction nozzle.
c) Keep the suction pipe free of all air pockets.
d) Pipework reducers should have a maximum total angle of divergence of 15 degrees.
e) The piping should be inclined up towards the pump inlet with eccentric reducers incorporated to
prevent air locks.
f) Flow should enter the pump suction with uniform flow, to minimise noise and wear.
7.3 Bypass Line
Operation at low flows results in pump horsepower heating the liquid. A bypass may be required to
prevent vaporisation and subsequent pump damage
7.4 Discharge Piping
a) Install a check valve and an isolation valve in the discharge piping. The check valve will protect the
pump against excessive pressure when the pump stops. It will also prevent the pump from running
backwards.
b) The check valve should be installed between the isolation valve and the pump nozzle in order to
permit its inspection.
c) Never throttle pump on suction side and never place a valve directly on the pump inlet or outlet
nozzle.
d) Pipework reducers should have a maximum total angle of divergence of 15 degrees.
8. ELECTRICAL CONNECTIONS
a) Electrical connections must be made by a qualified Electrician in accordance with relevant local
national and international regulations.
b) The motor must be wired up in accordance with the motor manufacturers instructions (normally
supplied within the terminal box) including any temperature, earth leakage, current and other
protective devices as appropriate. The identification nameplate should be checked to ensure the
power supply is appropriate.
c) A device to provide emergency stopping must be fitted.
d) For electrical details on pump sets with controllers see the separate wiring diagram.
e) Check the Direction of rotation of the motor before connecting the motor to the pump.
9. PROTECTION SYSTEMS
a) The following protection systems are recommended particularly if the pump is installed in a
potentially explosive area or is handling a hazardous liquid. If in doubt consult Pentair Southern
Cross.
b) If there is any possibility of the system allowing the pump to run against a closed valve or below
minimum continuous safe flow a protection device should be installed to ensure the temperature of
the liquid does not rise to an unsafe level.
c) If there are any circumstances in which the system can allow the pump to run dry, or start up empty,
a protection device should be fitted to stop the pump or prevent it from being started. This is
particularly relevant if the pump is handling a flammable liquid.
d) To prevent excessive surface temperatures at bearings it is recommended that the pump be fitted
with an internal cooling loop.
ISO PRO Centrifugal Pump
21
Advertisement
Table of Contents
