CALPEDA MXV 25-208/C [8/80] Maintenance and monitoring pump operation
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CALPEDA MXV 25-208/C [8/80] Maintenance and monitoring pump operation

CALPEDA MXV 25-208/C [8/80] Maintenance and monitoring pump operation
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.
I
f a priming loss occurs (interruption of delivery flow, despite
opened gate valves) or if a pressure oscillation is indicated on
t
he pressure gauge, make sure all the suction pipe couplings
are perfectly sealed and tighten the needle screw in the
drainage plug (
fig. 3b).
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
s
till 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: 0.3 m
3
/h for MXV.. 25-2; 0.5 m
3
/h for
MXV.. 32-4;1 m
3
/h for MXV.. 40-8.
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 lantern bracket is designed to con
-
tain 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
periods, it must be emptied completely
.
For good measure, as for temporary operation with dirty liquids,
run the pump briefly with clean water to remove deposits.
When the pump remains inactive it must be emptied
completely if there is a risk of freezing
(fig.4).
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
h
and, 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. 4).
F
or dismantling and re-assembly refer to the section drawing
(
section 12.) and figures 5 and 6.
D
ismantling and inspection of all internal parts can be carried
out without removing the pump casing (external jacket 14.02)
f
rom 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 external jacket (14.02).
2.
Remove the screw (32.32) with the washer (32.31) and the
c
oupling 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.
A
fterward reposition the shaft (64.00) as indicated in
s
ection 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).
5. Remove the nuts (61.04) from the tiebolts (61.02).
6.
Remove the lantern bracket (32.00), complete with bearing
(66.00) and coupling (64.22) from the shaft (64.00) and from
the external jacket (14.02).
Once the lantern bracket (32.00) has been removed, all the
internal parts can be extracted with the shaft (64.00) from the
external jacket (14.02).
7. Remove the upper cover (34.02) with the o-ring (14.20) and
then the delivery casing (20.00).
9.1 Replacing the mechanical seal
Remove the mechanical seal (36.00), the rotating part from the
shaft (64.00), making sure the shaft is not scratched, and then
the fixed part from the upper cover (34.02).
Make sure the spring of the
new mechanical seal is set with
the direction of the winding suitable for the direction of rotation
of the shaft: i.e. clockwise when seen from the stationary ring.
Make sure that all parts with which the mechanical seal comes into
contact are perfectly clean and free from any burr or cutting edges.
The seal rings in EPDM (Ethylene-Propylene) must never
come into contact with oil or grease
.
To facilitate the mounting
of the mechanical seal, lubricate the shaft, the seating of the
stationary part and the seal rings with clean water or any other
lubricant compatible with the material in which the seal rings
are made.
Push the rotating part as far as the shoulder ring (36.52) on the
shaft (64.00), without compressing the spring. Check the length
before and after insertion and raise the rotating ring as far as
the initial length (L1 in
fig.5).
In this way, correct compression of the spring will be ensured
when the fixed part is mounted and after the shaft is locked in
the coupling (L2 in
fig.6b).
Use every precaution so as not to damage the seal surfaces
with blows or angular impact.
Parte fissa
36.00
Parte rotante
36.00
14.02
36.52
34.02
14.20
32.00
3.93.018
64.00
L1
8
4.93.008
Fig. 4
Drainage
Air inlet
Fig.5 Inserting the mechanical seal
Rotating part
Fixed part
istr_MXV25 01_2010 10-12-2009 8:23 Pagina 8

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istr_MXV25 01_2010 10 12 2009 8 23 Pagina 8 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 make sure all the suction pipe couplings are perfectly sealed and tighten the needle screw in the drainage plug fig 3b 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 0 3 nT7h for MXV 25 2 0 5 nT7h for MXV 32 4 1 m3 h for MXV 40 8 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 lantern bracket is designed to con tain 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 periods it must be emptied completely For good measure as for temporary operation with dirty liquids run the pump briefly with clean water to remove deposits When the pump remains inactive it must be emptied completely if there is a risk of freezing fig 4 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 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 4 For dismantling and re assembly refer to the section drawing section 12 and figures 5 and 6 Dismantling and inspection of all internal parts can be carried out without removing the pump casing external jacket 14 02 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 external jacket 14 02 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 5 Remove the nuts 61 04 from the tiebolts 61 02 6 Remove the lantern bracket 32 00 complete with bearing 66 00 and coupling 64 22 from the shaft 64 00 and from the external jacket 14 02 Once the lantern bracket 32 00 has been removed all the internal parts can be extracted with the shaft 64 00 from the external jacket 14 02 7 Remove the upper cover 34 02 with the o ring 14 20 and then the delivery casing 20 00 9 1 Replacing the mechanical seal Remove the mechanical seal 36 00 the rotating part from the shaft 64 00 making sure the shaft is not scratched and then the fixed part from the upper cover 34 02 Make sure the spring of the new mechanical seal is set with the direction of the winding suitable for the direction of rotation of the shaft i e clockwise when seen from the stationary ring contact are perfectly clean and free from any burr or cutting edges The seal rings come into contact of the mechanical stationary part and lubricant compatible are made in EPDM Ethylene Propylene must never with oil or grease To facilitate the mounting seal lubricate the shaft the seating of the the seal rings with clean water or any other with the material in which the seal rings Push the rotating part as far as the shoulder ring 36 52 on the shaft 64 00 without compressing the spring Check the length before and after insertion and raise the rotating ring as far as the initial length L1 in fig 5 In this way correct compression of the spring will be ensured when the fixed part is mounted and after the shaft is locked in the coupling L2 in fig 6b Fig 4Drainage 8 Use every precaution so with blows or angular impact as not to damage the seal surfaces

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