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3.8 PORTS AND PIPEWORK
To add or change any pump ports the correct
port kit needs to be applied. Port kits contain all
components required to change assemble the
ports to the pump.
The correct port gasket (elastomer type) is
supplied with the pump.
•
Ensure the port seal (53) is free from
debris
•
Push the port seal into the seal area on
the port flange (54). (Seals will only fit in
one orientation)
•
Locate the port (with seal assembled)(53
& 54) on the rotor case (51) using the
location boss on the port and recess on
the side of the rotor case. (This is a small
circle on HP pumps locating around the
seal area locating on the outside diameter
of the port flange.)
•
Fit the port bolts (55) through the port
into the rotor case and tighten to a torque
of 20Nm.
Note: HP3 size and LH pumps have welded ports.
Pipe runs and sizes should be established at the
time the pump is selected.
When installing the pump do not deviate from
this design without rechecking the pump selection:
•
Keep pipe runs short and pipe diameters
large; pipes may need to be larger
diameter than pump ports especially when
pumping
viscous
cavitation.
•
Use large radius bends and full bore
valves. Avoids globe or needle valves on
viscous fluids.
•
Fit isolation valves on each side of the
pump to simplify maintenance.
•
Fit vacuum/pressure gauges each side of
pump to monitor pressure conditions.
Once the process is established (and will
not change), these can be removed.
•
Avoid filters on the inlet side of the pump
if possible. A clogged filter will cause
cavitation. A strainer - maximum hole size
50 microns - will help to protect the pump
from damage by particles, but must be
kept clear.
•
Support the pipework - the weight of the
pipe and the fluid within may not rest on
the pump.
liquids
to
prevent
•
Fit expansion joints if necessary to
prevent thermal expansion forces being
transmitted to the pump.
•
Ensure all pipe joints are:
o Air-tight under vacuum;
o Liquid tight under pressure, and;
o Steam tight where applicable.
•
Take special precautions when pumping
hazardous, hot, toxic or bacteriological
fluids - special joints and high specification
seals may be required.
•
Use hot water/steam jackets or electrical
resistance tape to heat pipes carrying
liquids which thicken when cool. Provide
an interlock to prevent the pump from
running unless the liquid in the pipes is at
correct
temperature
pressure, cavitation, or excessive drive
shaft loads.
3.9 ENLARGED RECTANGULAR
INLET
The weight of the hopper (Including the product
it contains) must be supported separately and is
not allowed to rest entirely on the pump as this
would affect the rotor clearances leading to pump
seizure. The mating flange of a hopper or screw
feeder should be machined to the identical
dimensions of the rectangular inlet and sealed.
This will avoid ledges where product could 'hang
up'. Ensure effective flow of viscous material into
the pump.
3.10 TEMPERATURE CONTROL
JACKETS
Pumps are available with optional temperature
control jackets. These allow hot or chilled water,
oil or steam to be piped to the pump to maintain
the product temperature in the pump or to heat
the pump prior to starting.
Pump Head – Thermal Jacket
to
avoid
over
13
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