CALPEDA MXV 50-1616/C [49/80] Maintenance and monitoring pump operation
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CALPEDA MXV 50-1616/C [49/80] Maintenance and monitoring pump operation

CALPEDA MXV 50-1616/C [49/80] Maintenance and monitoring pump operation
Check that the direction of rotation is as shown by the arrow
on the upper cover (34.02): i.e. counter-clockwise when
viewing the motor from the fan end. Otherwise disconnect
electrical power and reverse the connections of two phases.
Check that the pump works within its field of performance and
that the absorbed current shown on the name-plate is not
exceeded. Otherwise adjust the delivery gate valve or the
setting of any pressure switches.
If a priming loss occurs (interruption of delivery flow, despite
opened gate valves) or if a pressure oscillation is indicated on
the pressure gauge, repeat the venting operation on the suction
side (2), make sure all the suction pipe couplings are perfectly
sealed and tighten the air vent plug (2) and the draining plugs
(3) on the suction side (fig.3).
ATTENTION: when the pump is located above the water
level (suction lift operation,fig. 2A), after a long idle peri-
od, before restarting the unit, check that the pump is
still filled with liquid and vented.
Otherwise, check for proper operation (opening and closing) of
the foot valve and fill the pump with liquid (see section 7.2.).
Never run the pump for more than five minutes
with a closed gate valve.
Prolonged operation without a change of water in the
pump causes dangerous increases of temperature and
pressure.
In systems in which it may be possible to operate with a closed
delivery gate valve, install a bypass valve (fig. 2) to ensure a
minimum flow of about: 1.6 m
3
/h for MXV 50-16; 3 m
3
/h for
MXV 65-32; 5 m
3
/h for MXV 80-48.
When the water is overheated due to prolonged operation with
a closed port, stop the pump before opening the gate valve.
To avoid any risk of danger to users and the creation of harmful
thermal stress in the pump and system due to large temperature
differentials, wait until the water has cooled inside the pump before
starting again or before opening the drainage and filling plugs.
Care must be taken when the pumped fluid has a
high temperature. Do not touch the fluid when its
temperature is higher than 60 ˚C. Do not touch the
pump or motor when their surface temperature is
higher than 80 ˚C.
8. Maintenance and monitoring pump operation
Under normal operating conditions the pump-motor unit will not
require maintenance.
Conduct routine inspection on the pump and connected parts to
check for a perfect seal.
Check the seal on the shaft from the outside through the
coupling guard.
The special funnel-shaped upper cover is designed to contain
any small initial leaks.
Keep the pump and surrounding part clean so as to be able to
immediately detect any outward leakage.
Clean the filter in the suction pipe and/or foot valve at regular
intervals; check performance and absorbed current.
The ball bearings in the motor and the ball bearing in the pump
(66.00 - see section 9.2) have permanent lubrication.
No regreasing is necessary.
See the operating instructions of the motor (if supplied).
Remove any excess grease expelled from the ball-bearing
(66.00) after the first period of operation.
In the case of water containing chloride (chlorine or sea water)
the risk of corrosion increases in stagnant water conditions
(also with an increase in temperature and decrease of pH
value). In these cases, if the pump remains inactive for long pe-
riods, it must be emptied completely.
For good measure, as for temporary operation with dirty liq-
uids, run the pump briefly with clean water to remove deposits.
Or, after draining, perform the washing operation, inserting
clean water (at least 40 litres) into the filling hole (1 ) on the
delivery side and allowing it to come out of the draining hole (3)
on the suction side (fig.3).
When the pump remains inactive it must be emptied
completely if there is a risk of freezing. Remove both plugs
(14.12), (position 3, fig.3).
Before starting the motor again fill the pump completely with
liquid (see section 7.2.) and make sure the shaft is not jammed
by encrustation, sticking of the faces of the mechanical seal or
other causes. In the event that the shaft cannot be moved by
hand, the pump has to be dismantled and cleaned.
Disconnect electrical power before any servicing
operation and make sure the pump cannot be
accidentally switched on.
9. Dismantling
Before dismantling, close the gate valves in the suction and
delivery pipes and empty the pump casing (fig. 3).
For dismantling and re-assembly refer to the section drawing
(section 13.) and figures 4, 5, 6.
Dismantling and inspection of all internal parts can be carried
out without removing the pump casing (14.00) from the pipeline.
Sequence for dismantling:
1. Mark the position of the motor on the lantern bracket (32.00),
and the position of the lantern bracket on the upper cover
(34.02), ... on the external jacket (14.02), ... on the pump
casing (14.00).
2. Remove the screw (32.32) with the washer (32.31) and the
coupling guard (32.30).
3. Loosen the screws (64.25) of the coupling (64.22).
ATTENTION: to avoid compressing the spring of the mechanical
seal (36.00) because of axial shifting of the shaft (64.00), we
recommend to loosen the screws (64.25) of the coupling
(64.22) even only for removing or replacing the motor.
Afterward reposition the shaft (64.00) as indicated in section 10.2.
4. Disconnect the power cable from the terminal box, remove
the screws (70.18) with the nuts (70.19) and remove the
motor away from the coupling (64.22) (fig.4a).
5. Remove the screws (61.07) and remove the lantern brack-
et (32.00), complete with bearing (66.00) and coupling
(64.22) from the upper cover (34.02) and from the shaft
(64.00) (fig.4b).
6. Remove the nuts (61.04) and washers (61.03) from the
tiebolts (61.02).
7. Remove the upper cover (34.02) from the shaft (64.00) and
from the external jacket (14.02) - or with the external jacket
from the pump casing (14.00) - with the aid of a mallet or
lever, exercising pressure in alternate operations, from di-
ametrically opposite positions (fig.4c).
Once the upper cover (34.02) has been removed, all the
internal parts can be extracted from the pump casing (14.00).
4.93.216
32.31
32.32
14.02
36.00
61.02
14.00
70.18
70.19
64.00
66.18
99.00
66.00
32.00 64.22 64.25 61.0732.31
32.30
66.19
34.02
61.03
61.04
a
b
c
Fig. 4a Removal of motor
b Removal of lantern bracket
c Removal of upper cover
9

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Check that the direction of rotation is as shown by the arrow on the upper cover 34 02 i e counter clockwise when viewing the motor from the fan end Otherwise disconnect electrical power and reverse the connections of two phases Check that the pump works within its field of performance and that the absorbed current shown on the name plate is not exceeded Otherwise adjust the delivery gate valve or the setting of any pressure switches If a priming loss occurs interruption of delivery flow despite opened gate valves or if a pressure oscillation is indicated on the pressure gauge repeat the venting operation on the suction side 2 make sure all the suction pipe couplings are perfectly sealed and tighten the air vent plug 2 and the draining plugs 3 on the suction side fig 3 ATTENTION when the pump is located above the water level suction lift operation fig 2A after a long idle peri od before restarting the unit check that the pump is still filled with liquid and vented Otherwise check for proper operation opening and closing of the foot valve and fill the pump with liquid see section 7 2 Never run the pump for more than five minutes with a closed gate valve Prolonged operation without a change of water in the pump causes dangerous increases of temperature and pressure In systems in which it may be possible to operate with a closed delivery gate valve install a bypass valve fig 2 to ensure a minimum flow of about 1 6 m3 h for MXV 50 16 3 m3 h for MXV 65 32 5 m3 h for MXV 80 48 A When the water is overheated due to prolonged operation with a closed port stop the pump before opening the gate valve To avoid any risk of danger to users and the creation of harmful thermal stress in the pump and system due to large temperature differentials wait until the water has cooled inside the pump before starting again or before opening the drainage and filling plugs A Care must be taken when the pumped fluid has a high temperature Do not touch the fluid when its temperature is higher than 60 C Do not touch the pump or motor when their surface temperature is higher than 80 C 8 Maintenance and monitoring pump operation Under normal operating conditions the pump motor unit will not require maintenance Conduct routine inspection on the pump and connected parts to check for a perfect seal Check the seal on the shaft from the outside through the coupling guard The special funnel shaped upper cover is designed to contain any small initial leaks Keep the pump and surrounding part clean so as to be able to immediately detect any outward leakage Clean the filter in the suction pipe and or foot valve at regular intervals check performance and absorbed current The ball bearings in the motor and the ball bearing in the pump 66 00 see section 9 2 have permanent lubrication No regreasing is necessary See the operating instructions of the motor if supplied Remove any excess grease expelled from the ball bearing 66 00 after the first period of operation A Disconnect electrical power before any servicing operation and make sure the pump cannot be accidentally switched on 9 Dismantling Before dismantling close the gate valves in the suction and delivery pipes and empty the pump casing fig 3 For dismantling and re assembly refer to the section drawing section 13 and figures 4 5 6 Dismantling and inspection of all internal parts can be carried out without removing the pump casing 14 00 from the pipeline Sequence for dismantling 1 Mark the position of the motor on the lantern bracket 32 00 and the position of the lantern bracket on the upper cover 34 02 on the external jacket 14 02 on the pump casing 14 00 2 Remove the screw 32 32 with the washer 32 31 and the coupling guard 32 30 3 Loosen the screws 64 25 of the coupling 64 22 ATTENTION to avoid compressing the spring of the mechanical seal 36 00 because of axial shifting of the shaft 64 00 we recommend to loosen the screws 64 25 of the coupling 64 22 even only for removing or replacing the motor Afterward reposition the shaft 64 00 as indicated in section 10 2 4 Disconnect the power cable from the terminal box remove the screws 70 18 with the nuts 70 19 and remove the motor away from the coupling 64 22 fig 4a 5 Remove the screws 61 07 and remove the lantern brack et 32 00 complete with bearing 66 00 and coupling 64 22 from the upper cover 34 02 and from the shaft 64 00 fig 4b 6 Remove the nuts 61 04 and washers 61 03 from the tiebolts 61 02 7 Remove the upper cover 34 02 from the shaft 64 00 and from the external jacket 14 02 or with the external jacket from the pump casing 14 00 with the aid of a mallet or lever exercising pressure in alternate operations from di ametrically opposite positions fig 4c Once the upper cover 34 02 has been removed all the internal parts can be extracted from the pump casing 14 00 99 00 70 18 70 19 b 32 30 32 32 32 31 In the case of water containing chloride chlorine or sea water the risk of corrosion increases in stagnant water conditions also with an increase in temperature and decrease of pH value In these cases if the pump remains inactive for long pe riods it must be emptied completely For good measure as for temporary operation with dirty liq uids run the pump briefly with clean water to remove deposits Or after draining perform the washing operation inserting clean water at least 40 litres into the filling hole 1 on the delivery side and allowing it to come out of the draining hole 3 on the suction side fig 3 When the pump remains inactive it must be emptied completely if there is a risk of freezing Remove both plugs 14 12 position 3 fig 3 61 04 Before starting the motor again fill the pump completely with liquid see section 7 2 and make sure the shaft is not jammed by encrustation sticking of the faces of the mechanical seal or other causes In the event that the shaft cannot be moved by hand the pump has to be dismantled and cleaned 14 00 32 1 1 H4 22 61 03 34 02 61 02 36 00 64 00 14 02 Fig 4a Removal of motor b Removal of lantern bracket c Removal of upper cover H4 25 61 07 f

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