SPP Pumps Unistream - Manual (Page 7)

Operators Instructions for
Unistream Centrifugal Pumps
Manual No/Rev
W21-002E / 10
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 7 of 24
Unacceptable Suction Pipework
Trapped Air
Unsupported Pipe
UNISUC02.CDR
Where pumping water at temperatures
above 70°C, care must be taken to ensure
that enough pressure is available at the
impeller entry to prevent vaporisation.
An appropriate fine strainer is recommended
to prevent foreign matter from being drawn
into the pump. A screen or basket strainer
may also be required to hold back larger
items. These should be sized to maintain the
flow through them to below 0.6 m/s.
The suction pipe work must be flushed clean
to ensure that site debris is not drawn into
the pump when it is commissioned.
4.7 Discharge Pipework
The bore of the discharge pipe should be
sized to ensure a flow velocity of 2.5 to 3 m/s
is not exceeded. This is usually one size
larger than the discharge branch. Pipework
should be as short and straight as possible
to reduce friction head loss.
A non-return valve is usually fitted to prevent
the pump from excessive back pressure and
reverse rotation and a discharge valve is
usually fitted to regulate the flow and allow
for inspection and maintenance on the
pump.
The suction and discharge pipework must be
independently supported and positioned
such that no excessive forces and moments
are exerted on the pump flanges.
Failure to support suction
and
delivery pipework
may result in distortion of the pump casing,
with the possibility of early pump failure.
Preferred Pipework
Discharge Pipe
Discharge
Valve
Check Valve
Increaser
Eccentric
Reducer Suction Valve
Suction Pipe
UNIPIP02.CDR
4.8 Foundations
The baseplate must be secured to
substantial foundations with suitable
foundation bolts to minimise vibrations. A
space of approximately 25mm should be left
between the baseplate and the foundations
for grouting. After the grouting has dried, the
foundation bolts should be tightened and the
shaft alignment checked again before
commissioning and putting the pump into
operation.
5. Commissioning and Operation
5.1 Commissioning Checks
These checks must be done after first
installation and after pump maintenance that
requires removal of the rotating assembly.
Abrasion and Entrapment Hazard
Do NOT touch any moving or
rotating parts. Guards are provided
to prevent access to these parts, where they
have been removed for maintenance they
MUST be replaced before operating the
equipment.
If the gland packing has been removed for
storage, this must be replaced as described
in Section 6.2.3 - Re-packing.
Check the level of the oil in the bearing
housing is at the level mark on the sight
glass on the side of the bearing housing.
Refer to Section 6.4 - Bearing Lubrication.
If the shaft sealing is by gland packing, the
packing should be relatively slack and check
that the gland (45.2) is free.
ATTENTION