SPP Pumps Eurostream - Manual (Page 9)

Operators Instructions for
Eurostream Centrifugal Pumps
Manual No/Rev
W22-001E / 9
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 9 of 20
6.4.2 Dismantling
Introduction
In general when pumps are dismantled,
inspected and/or replacement parts fitted,
the work is undertaken for one of the
following reasons.
a) Preventative Maintenance:
Because the time for the regular periodic
inspection has become due. Planned
inspection
and maintenance at pre-
determined intervals is a sound insurance
against a forced shutdown due to a failure at
a more inconvenient time.
b) Remedial Maintenance:
Perceptible fall off in pump performance
affecting capacity and pressure or: failure of
mechanical
seal or: excessive and
continuous vibration with persistent noisy
operation.
The extent of dismantling required will
depend upon the reasons above.
In the case of preventative maintenance,
inspections are done at pre-selected times
and the pump usually requires complete
dismantling, so that all parts can be cleaned,
examined and measured for wear.
The extent of dismantling for remedial
maintenance will depend upon the cause of
failure and needs only to reveal the source of
the trouble.
When dismantling the pump, the volute
casing can remain mounted in the pipework.
Tightly shut both the inlet (if fitted) and outlet
valves and disconnect any external service
connectors.
On pumps using motors with frame sizes up
to and including D180M, it is NOT advisable
to remove the stub shaft under normal pump
maintenance conditions. On these pumps,
the stub shaft (21.11) is attached to the
motor using a collet nut and grub screw
arrangement. It requires special tools and
fixtures to remove and reassemble correctly.
It is recommended that this be performed
only by a trained SPP Pumps Ltd. Service
Engineer or an authorised SPP Pumps Ltd.
dealer/agent.
On pumps with larger motors, nominally over
22kW, the stub shaft locates positively onto
the motor shaft and is secured using a
Ringfeeder Shrink Disc assembly (150.0).
To dismantle pump, proceed in the following
sequence:
1. Drain liquid from the casing, remove plug
(90.3).
2. Unscrew nuts (92.09) on motor slide rail tee
bolts (90.8).
3. Unscrew nuts (92.0) on volute casing studs
(90.2
4. Motor (80.1), complete with supporting frame
(34.4) and casing cover (16.1), can now slide
back along slide rails (102.01) and clear of
volute casing (10.2).
Note! On the pumps fitted with a clamped casing
cover, care must be taken not to disturb the
joint between the casing cover (16.1) and
supporting frame (34.4).
5. The impeller (23.0) is now clear of casing
(10.2) and can be removed by unscrewing
the impeller nut (92.2) in a counter clockwise
direction and removing the lock washer
(93.0).
6. Remove the impeller key.
7. To remove the rotating elements of the
mechanical seal, either:
a) For the following pumps, fitted with shaft
sleeves (52.3).
32/13 32/16 32/20 32/26
40/13 40/16 40/20 40/26
50/13 50/16 50/20 50/26*
65/13 65/16 65/20*
80/16
With the impeller (23.0) and key (94.01)
removed, the shaft sleeve (52.3) complete
with the rotating element of the mechanical
seal (43.3) can now be slid off shaft (21.11).
Note * - Pump sizes 65/20 and 50/26 are
supplied in either configuration depending on
motor size.
b) or the following pumps, fitted with solid
stainless steel shafts (21.1) and abutment
rings (160.0)
50/26*
65/20* 65/26 65/32
80/20 80/26 80/32
100/20 100/26 100/32
125/26
With the impeller (23.0) and key (94.01)
removed the rotating element of the
mechanical seal (43.3) can be removed from
the shaft.
8. The seal should be carefully examined and if
worn, should be replaced. Do not remove
the rubber or elastomer bellows from the