zxc ® 17-Oct-2012 15:14

DESMI self-priming centrifugal pump MODULAR S / OPERATION AND MAINTENANCE INSTRUCTION


Year: 2003
Language: english
Author: DESMI
Genre: INSTRUCTION
Publisher: DESMI A/S
Format: PDF
Quality: OCR without errors
Number of pages: 20
Description: These operation and maintenance instructions apply to the DESMI MODULAR S pump series. The pumps
are available in sizes ranging from 25 to 100 mm on the pressure flange. The suction flange is bigger than the
pressure flange.
DESMI S is a single-stage self-priming centrifugal pump with stainless steel shaft and mechanical shaft seal.
The smallest pumps, S-32-25-110 and S-50-32-135, have open impeller, whereas all other sizes have closed
impeller.
The pump is suitable for the pumping of clean and polluted liquids with temperatures between 0 and 80°C.
With special shaft seal up to 140°C. Max. number of revolutions: 3600 RPM.
The pump has horizontal inlet on the centre line and vertical outlet at the top.
The back of the impeller is equipped with relief blades to reduce the load on the bearings.
Relief holes in the impeller ensure circulation of liquid for the shaft seal and prevent overheating of the shaft
seal during normal operation.
The pump is particularly suitable for the pumping of water in connection with e.g. cooling of diesel engines,
as bilge pumps, ballast pumps, pumps for irrigation, washing plants, air conditioning, cooling systems, and
sanitary systems, etc. Furthermore, in the majority of cases where the transport of liquid is required within
industry.

TABLE OF CONTENTS: PAGE

1. PRODUCT DESCRIPTION..........................................................................................................................3
1.1 DELIVERY..............................................................................................................................................3
2. TECHNICAL DATA ....................................................................................................................................3
2.1 EXPLANATION OF THE TYPE NUMBER..........................................................................................3
2.2 TECHNICAL DESCRIPTION................................................................................................................4
3. INSTALLATION..........................................................................................................................................6
3.1 MOUNTING/FASTENING.....................................................................................................................6
3.2 WIRING...................................................................................................................................................7
4. TRANSPORT/ STORAGE ...........................................................................................................................7
5. DISMANTLING ...........................................................................................................................................8
5.1 ACCESS TO IMPELLER AND SHAFT SEAL......................................................................................8
5.2 DISMANTLING SHAFT SEAL .............................................................................................................8
5.3 DISMANTLING SEAT...........................................................................................................................8
5.4 DISMANTLING SHAFT WITH BEARINGS........................................................................................8
5.5 INSPECTION ..........................................................................................................................................8
6. ASSEMBLING..............................................................................................................................................9
6.1 FITTING SEALING RING IN PUMP CASING.....................................................................................9
6.2 FITTING SHAFT WITH BEARINGS ....................................................................................................9
6.3 FITTING WATER DEFLECTOR...........................................................................................................9
6.4 FITTING SHAFT SEAL..........................................................................................................................9
6.5 FITTING IMPELLER..............................................................................................................................9
6.6 FITTING GUIDE RING AND GUIDE VANE PIECE (ONLY S-32-25-110) .......................................9
6.7 FITTING BEARING HOUSING AND SHAFT SEAL COVER..........................................................10
6.8 SHAFT...................................................................................................................................................10
7. FROST PROTECTION...............................................................................................................................10
8. DISMANTLING .........................................................................................................................................10
9. START-UP..................................................................................................................................................10
9.1 STARTING............................................................................................................................................11
10. SYSTEM BALANCING............................................................................................................................11
11. INSPECTION AND MAINTENANCE.....................................................................................................13
11.1 DRAINING THE PUMP .....................................................................................................................13
11.2 BEARINGS..........................................................................................................................................13
12. REPAIRS....................................................................................................................................................13
12.1 ORDERING SPARE PARTS ..............................................................................................................13
13. OPERATING DATA .................................................................................................................................13
14. EU DECLARATION OF CONFORMITY................................................................................................15
15. ASSEMBLY DRAWINGS ........................................................................................................................16
16. SPARE PARTS LISTS...............................................................................................................................16
17. DIMENSIONAL SKETCH........................................................................................................................19

Additional information

1.1 DELIVERY
- Check on delivery that the shipment is complete and undamaged.
- Defects and damages, if any, to be reported to the carrier and the supplier immediately in
order that a claim can be advanced.
2. TECHNICAL DATA
The pumps are manufactured in various material combinations which appear from the type number on the
name plate. See below.
2.1 EXPLANATION OF THE TYPE NUMBER
All the S pumps are provided with a nameplate. The type number indicated on the nameplate is built up as
follows:
S-XXX-YYY-ZZZ-MR
XXX, YYY, ZZZ : Pump size where
XXX = Suction branch diameter, YYY= Pressure branch diameter,
ZZZ = Standard impeller diameter.
M : The material combination of the pump.
R : The assembly combination of the pump.
M may be the following:
A : Standard. Casing: GG20. Impeller: AlBz.
C : All cast iron.
D : Casing: BSP5, Impeller: AlBz.
E : Special alloy.
The pumps can be delivered in other material combinations which are agreed with the supplier.
R may be the following:
01 : With electromagnetic clutch.
02 : Monobloc, flange-mounted with electric motor.
03 : With hydraulic motor.
04 : V-belt pulley and disengaging clutch.
07 : On base plate with petrol or diesel engine, or with electric motor.
08 : Mounted on trolley with petrol or diesel engine or with electric motor.
09 : With bare shaft end.
10 : Special-tailored according to task.
Any use of the pump is to be evaluated on the basis of the materials used in the pump. In case of doubt,
contact the supplier.
Pumps in material combinations A and C are primarily used for fresh water.
Pumps in material combination D are primarily used for seawater.
If the pumps are designed for special purposes the following is to be indicated:
Pump No. : __________________________________________________________________
Pump type : __________________________________________________________________
Application : __________________________________________________________________
Comment : __________________________________________________________________
2.2 TECHNICAL DESCRIPTION
The noise level of the pump depends on the motor type supplied, as the noise from the pump can be
calculated as the noise level of the motor + 2dB(A).
The capacity of the pump appears from the nameplate on the pump. If the pump has been delivered without
motor, the pump capacity is to be indicated on the plate when mounting the motor.
3. INSTALLATION
3.1 MOUNTING/FASTENING
The pump should be mounted and fastened on a solid base plate with a flat and horizontal surface to avoid
distortion.
The max. permissible loads on the flanges stated in paragraph 2.2 are to be observed.
When mounting a V-belt pulley on the pump a bore H7 is recommended. To facilitate the mounting the hub
in the V-belt pulley may be heated to about 100 °C after which the V-belt pulley is easily lead over the shaft
towards the shoulder. Alternatively, the V-belt pulley may be mounted with a TAPER LOCK bush.
When dimensioning the V-belt pulley it is important to follow the rules of the DESMI nomograms for the
pump size in question - contact DESMI.
If the pump is to be driven by a motor via a flexible coupling, motor and pump are to be placed on a common
base plate. The following should be observed:
- Avoid distortion of the base plate.
- Avoid distortion in the piping system.
- Check that pump and motor are aligned correctly.
Below please find 2 proposals for alignment. The deviations mentioned cover a complete revolution of the
coupling. The distance between the coupling halves is to be between 2 and 4 mm.
At installations pumping hot or very cold liquids, the operator must be aware that it is
dangerous to touch the pump surface, and, consequently, he must take the necessary safety
measures.
When connecting the pump and a prime mover the power transmission is to be equipped with a guard in
accordance with the provisions of the COUNCIL DIRECTIVE of June 14, 1989, on the safety of machines.
3.2 WIRING
Wiring to be carried out by authorized skilled workmen according to the rules and regulations
in force.
4. TRANSPORT/ STORAGE
The weights of the pumps (in A09 combination) are stated in the following table, and the pumps are to be
lifted as shown.
Pump Weight kg Pump Weight kg
S-32-25-110 21.5 S-80-70-275 86.0
S-50-32-135 22.0 S-100-80-175 72.0
S-70-50-175 42.0 S-100-80-220 92.5
S-70-50-220 58.0 S-100-80-275 107.0
S-70-50-275 72.0 S-125-80-220 116.0
S-80-70-175 53.0 S-125-80-275 122.0
S-80-70-220 59.0 S-125-100-220 138.0
The pump is to be stored in a dry area.
Before shipment the pump is to be fastened securely on pallets or the like.
The pump is to be lifted as
shown here:
The lifting straps must not bear against
sharp edges and corners.
5. DISMANTLING
5.1 ACCESS TO IMPELLER AND SHAFT SEAL
Remove Allen screws (22), which hold the shaft seal cover to the pump casing, and pull the bearing housing
to remove the complete bearing housing with impeller, bearings, and shaft.
Only S-32-25-110 and S-50-32-135:
Remove Allen screw (22) which holds the bearing housing to the pump casing and pull the bearing housing
with impeller and guide vane piece out of the pump casing.
Then remove Allen screw (29) (only S-32-25-110), and guide vane piece and guide ring can be dismantled
from the bearing housing.
5.2 DISMANTLING SHAFT SEAL
Remove nut (6). Pull off the impeller. Remove Allen screws (19), which hold the bearing housing to the
shaft seal cover. Pull shaft seal cover and bearing housing apart, by which shaft seal and water deflector are
pulled off the shaft.
Only S-32-25-110 and S-50-32-135:
Unscrew impeller. Dismantle the oil seal ring (31) by puncturing the front to permit the oil seal ring to be
pulled out with a hook. The oil seal ring cannot be used again. Dismantle the ring lock (30), and the shaft
with bearings can be pulled out of the bearing housing. At the same time, the shaft seal and the water
deflector are pulled off the shaft.
5.3 DISMANTLING SEAT
Press out the seat from behind the shaft seal cover (the bearing housing in S-32-25-110 and S-50-32-135).
5.4 DISMANTLING SHAFT WITH BEARINGS
Before dismantling the shaft with bearings, remove the sunk key (16). The shaft can now be pulled out of the
bearing housing allowing inspection of the bearings.
5.5 INSPECTION
When the pump has been dismantled, check the following parts for wear and damage:
- Sealing ring/impeller: Max. clearance 0.4-0.5 mm measured in radius.
(There is no sealing ring
in S-32-25-110
and S-50-32-135)
- Shaft seal/shaft seal cover: Check the seat for flatness and cracks.
Check the rubber parts for elasticity.
- Bearings: Replace in case of wear and noise.
6. ASSEMBLING
6.1 FITTING SEALING RING IN PUMP CASING
When fitted, the sealing ring is to bear against the shoulder of the pump casing.
6.2 FITTING SHAFT WITH BEARINGS
Lead shaft with bearings into the bearing housing. Fit sunk key (16). (Fit ring lock (30) and a new oil seal
ring (31) in S-32-25-110 or S-50-32-135).
6.3 FITTING WATER DEFLECTOR
Assemble the bearing housing and the shaft seal cover. Lead the water deflector over the shaft until it
touches the shaft seal cover and then further 1-1.5 mm into the shaft seal cover (the bearing housing in S-32-
25-110 or S-50-32-135).
6.4 FITTING SHAFT SEAL
Before fitting the seat, clean the recess in the shaft seal cover (the bearing housing in S-32-25-110 or S-50-
32-135). When fitting the seat, remove the protective coating without scratching the lapped surface. Dip the
outer rubber ring of the seat into olive oil (or another neutral oil). Now press the seat into place with the
fingers and check that all parts are correctly imbedded. If it is necessary to use tools for assembling, then
protect the sliding surface of the seat to prevent it from being scratched or cut. Lubricate the inner diameter
of the slide ring rubber bellows with olive oil and push it over the shaft. The use of a fitting bush as shown
on the assembly drawing is recommended to avoid that the rubber bellows is cut. Push the slide ring over the
shaft with the hand. If the rubber bellows is tight, use a fitting tool and take care that the slide ring is not
damaged.
If the carbon ring is not fixed, it is important to check that it is fitted correctly, i.e. the chamfered/lapped side
is to face the seat. The carbon ring can be held by a little grease. When using oil on the shaft, the bellows will
settle and seat in about 15 minutes, and until then tightness should not be expected. After start, check by
viewing the leak hole that there are no leaks.
6.5 FITTING IMPELLER
Fit the sunk key in the shaft and lead the impeller towards the shoulder of the shaft. Take care that the ring at
the end of the shaft seal spring locates in the recess of the impeller. Secure the impeller with a washer and a
nut.
Only S-32-25-110 and S-50-32-135:
Apply LOCTITE 270 or similar to the thread on the shaft. Screw the impeller towards the shoulder of the
shaft. Take care that the ring at the end of the shaft seal spring locates in the recess of the impeller.
6.6 FITTING GUIDE RING AND GUIDE VANE PIECE (ONLY S-32-25-110)
Place the guide ring (35) in the recess of the bearing housing. Fit and fasten the guide vane piece on the
guide ring. Note that the flat part of the inlet neck of the guide vane piece is to face upwards, i.e. opposite of
the drain passage for the shaft seal in the bearing housing. If the shaft cannot rotate freely, dismantle the
guide vane piece again, and place a shim (34) between bearing housing and guide ring.
6.7 FITTING BEARING HOUSING AND SHAFT SEAL COVER
Place the gasket between pump casing and shaft seal cover on the shaft seal cover where it can be held with a
little grease. Lead bearing housing with shaft seal cover into place and fasten. Note that the drain hole for the
shaft seal faces downwards.
S-32-25-110:
Place the gasket (21) between pump casing and bearing housing on the bearing housing. Check that the nonreturn
flap is placed correctly in the pump casing. Lead the bearing housing into place and fasten. Note that
the drain passage for the shaft seal faces downwards.
S-50-32-135:
Place the gasket (21) between pump casing and bearing housing on the bearing housing. Lead the bearing
housing into place and fasten. Note that the drain passage for the shaft seal faces downwards. If the shaft
cannot rotate freely, dismantle the bearing housing again, and place an extra gasket (21) between bearing
housing and pump casing.
6.8 SHAFT
When the pump has been assembled, check that the shaft rotates freely.
7. FROST PROTECTION
Pumps, which are not in operation during frost periods, are to be drained to avoid frost damage. Remove the
plug at the bottom to empty the pump. Alternatively, it is possible to use anti-freeze liquids in normal
constructions.
8. DISMANTLING
Before dismantling the pump make sure that it has stopped. Empty the pump of liquid before it
is dismantled from the piping system. If the pump has been pumping dangerous liquids you are
to be aware of this and take the necessary safety measures. If the pump has been pumping hot
liquids, take great care that it is drained before it is removed from the piping system.
9. START-UP
A self-priming centrifugal pump will not function until the pump casing has been filled with
liquid.
The liquid also serves as coolant for the shaft seal. In order to protect the shaft seal the pump
must not run dry.
WARNING
For safety reasons the pump is only allowed to operate against a closed discharge valve for a short time
(max. 5-10 minutes and at a max. temperature of 130°C). To protect the pump against unintentional
operation it is equipped with a relief valve, which opens at a preset pressure.
Be careful: When the valve opens, the escaping liquid will be hot.
The relief valve must in no circumstances be removed or re-adjusted !
As regards maintenance of the relief valve - see paragraph 11.
9.1 STARTING
Before starting the pump check that
- the shaft rotates freely without jarring sounds.
- the pump casing is filled with liquid.
Start the pump for a moment to check the direction of rotation. If the direction is correct (i.e. in the direction
of the arrow), the pump may be started.
10. SYSTEM BALANCING
It is often difficult to calculate a manometric delivery head in advance. It is, however, decisively important to
the quantity of liquid delivered.
A considerably smaller delivery head than expected will increase the quantity of liquid delivered, causing
increased power consumption and perhaps cavitation in pump and piping. In the pump the impeller may
show signs of heavy erosion caused by cavitation (corrosion) which may at times render an impeller unfit for
use in a very short time. Not unusually do similar erosions occur in pipe bends and valves elsewhere in the
piping system.
Therefore, after start-up, it is necessary to check either the quantity of liquid delivered or the power
consumption of the pump e.g. by measuring the current intensity of the connected motor. Together with a
reading of the differential pressure the quantity of water delivered can be determined against the
characteristics of the pump.
Should the pump not function as intended, please proceed according to the faultfinding list. Bear in mind,
though, that the pump was carefully checked and tested at the factory and that the majority of faults stem
from the piping system.
Rating: 4.9 / 5 (Votes: 15)
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