Flowserve MJ Slurry - Manual (Page 12)

MJ SLURRY USER INSTRUCTIONS ENGLISH 71569294 - 02/08
Page 12 of 54
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2.5 Recycling and end of product life
At the end of the service life of the product or its parts,
the relevant materials and parts should be recycled or
disposed of using an environmentally acceptable
method and in accordance with local regulations. If the
product contains substances that are harmful to the
environment, these should be removed and disposed of
in accordance with current local regulations. This also
includes the liquids and/or gases that may be used in
the "seal system" or other utilities.
Make sure that hazardous substances are
disposed of safely and that the correct personal
protective equipment is used. The safety specifications
must be in accordance with the current local
regulations at all times.
3 PUMP DESCRIPTION
3.1 Configurations
Flowserve "MJ Slurry" pumps are single stage, vertical
bottom suction centrifugal pumps specifically designed
for handling abrasive slurries typical of mining and
mineral process. A semi-concentric volute type casing
is pedestal mounted with tangential discharge nozzle.
The closed impeller with rear pump-out vanes is
capable of passing solids of various sizes. The rigid
three point thrust bearing housing support permits
precision bearing alignment. The casing is supported
from the top plate by column pipe(s).
The pump has a water lubricated steady bearing
located in a lower housing located above the impeller.
Intermediate steady bearings will be supplied to
maintain shaft critical speeds are above the operating
speeds.
Pumps can be v-belt driven or direct driven by an
electric motor. The bearing frame design varies
according to the drive method.
All pumps are carefully inspected and prepared for
shipment. All exterior machined surfaces are coated
with a rust preventative compound and openings are
provided with covers or plugs. The axial impeller
running clearance is preset at the factory but should be
checked prior to final alignment in case of tampering.
3.2 Name nomenclature
The pump size will be engraved on the nameplate. The
following example explains how the pump name
identifies the construction features and options.
8MJ-193
Nominal discharge branch size.
Configuration – see below.
Nominal maximum impeller diameter.
Frame size
MJ
is added for vertical bottom-bearing configuration
MSJ is added for recessed impeller
3.3 Design of major parts
3.3.1 Pump casing
The pump casing is a semi-concentric volute type
casing and tangential discharge nozzle. The casing is
pedestal mounted therefore the discharge can be
rotated to meet a number of optional orientations. On
standard duty casing the suction nozzle is integral to
the casing. On severe duty pumps the pump uses a
removable suction cover. The casing joints are
gasketed connections.
3.3.2 Impeller
The impeller is closed design as standard but may be
changed to open designs for mud, froth and viscous
applications. The impeller is thread mounted to the
shaft. All impellers are supplied with pump out vanes to
minimise wear and reduce pressure at the stuffing box.
The vanes are curved to optimize efficiency however,
the “S” configuration utilizes straight radial vanes to
reduce blockage. The impeller of the MS pump has
larger front clearances to reduce shear and improve
froth handling capabilities.
3.3.3 Shaft
The large diameter stiff shaft, mounted on bearings,
has a keyed drive end.
3.3.4 Pump bearings and lubrication
Ball bearings are fitted as standard above the top plate
and grease lubricated. Pumps that are direct driven
have a set of angular contact ball bearings mounted
back-to-back. Pumps that are MVD driven have 2 sets
the bearings. The lower bearing, located just above the
mounting plate is a deep groove ball bearing. A set of
angular contact ball bearings is located towards the
sheave. All bearings located below the top plate are
water lubricated. These are generally cutlass rubber