Desmi Modular S-N Series Manual

OPERATION AND MAINTENANCE INSTRUCTION
DESMI self-priming centrifugal pump
MODULAR S-N
DESMI Pumping Technology A/S
Tagholm l, DK-9400 Nørresundby, Denmark
Tel.:
[phone]
Fax:
[phone]
E-mail:
[email protected]
Internet:
www.desmi.com
Manual:
T1440
Language:
English
Revision:
H (11/20)

Table of contents:
1. PRODUCT DESCRIPTION................................................................................................................................ 3
1.1 DELIVERY............................................................................................................................................................. 3
2. TECHNICAL DATA ............................................................................................................................................ 3
2.1 NAME PLATE........................................................................................................................................................ 3
2.2 EXPLANATION OF THE TYPE NUMBER......................................................................................................... 4
2.3 TECHNICAL DESCRIPTION .............................................................................................................................. 4
3. INSTALLATION.................................................................................................................................................. 6
3.1 MOUNTING/FASTENING ................................................................................................................................... 6
3.2 WIRING.................................................................................................................................................................. 7
4. TRANSPORT/ STORAGE .................................................................................................................................. 7
5. DISMANTLING ................................................................................................................................................... 7
5.1 ACCESS TO IMPELLER AND SHAFT SEAL ................................................................................................... 7
5.2 DISMANTLING SHAFT SEAL............................................................................................................................. 8
5.3 DISMANTLING SEAT........................................................................................................................................... 8
5.4 DISMANTLING SHAFT WITH BEARINGS ....................................................................................................... 8
5.5 INSPECTION......................................................................................................................................................... 8
6. ASSEMBLING..................................................................................................................................................... 8
6.1 FITTING SEALING RING IN PUMP CASING ................................................................................................... 8
6.2 FITTING SHAFT WITH BEARINGS................................................................................................................... 8
6.3 FITTING WATER DEFLECTOR ......................................................................................................................... 8
6.4 FITTING SHAFT SEAL......................................................................................................................................... 9
6.5 FITTING IMPELLER............................................................................................................................................. 9
6.6 FITTING GUIDE RING AND GUIDE VANE PIECE (ONLY S32-25-110N)................................................... 9
6.7 FITTING BEARING HOUSING AND SHAFT SEAL COVER.......................................................................... 9
6.8 SHAFT.................................................................................................................................................................. 10
7. FROST PROTECTION......................................................................................................................................10
8. DISMANTLING ..................................................................................................................................................10
9. START-UP..........................................................................................................................................................10
9.1 STARTING........................................................................................................................................................... 10
10. SYSTEM BALANCING ...................................................................................................................................11
11. INSPECTION AND MAINTENANCE .............................................................................................................12
11.1 DRAINING THE PUMP.................................................................................................................................... 12
11.2 BEARINGS........................................................................................................................................................ 12
12. REPAIRS..........................................................................................................................................................12
12.1 ORDERING SPARE PARTS........................................................................................................................... 12
13. OPERATING DATA..........................................................................................................................................13
14. EC DECLARATION OF CONFORMITY........................................................................................................14
15. INFORMATION RELEVANT FOR DISASSEMBLY OR DISPOSAL AT END-OF-LIFE............................15
16. ASSEMBLY DRAWINGS................................................................................................................................16
17. SPARE PARTS LISTS.....................................................................................................................................16
18. DIMENSIONAL SKETCH................................................................................................................................19

DESMI Pumping Technology A/S 3
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
1. PRODUCT DESCRIPTION
These operation and maintenance instructions apply to the DESMI MODULAR S-N 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, S32-25-110N and S50-32-135N, 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 f.inst. cooling of diesel
engines, as bilge pumps, ballast pumps, pumps for irrigation, washing plants, air conditioning,
cooling systems, and sanitary systems, etc. Furthermore, inthe majority of cases wherethe transport
of liquid is required within industry.
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 NAME PLATE
Manufacturer:
DESMI
DK-9400 Nørresundby
Phone [phone]
Fax [phone]
e-mail: [e-mail]
http:\\www.desmi.com
TYPE: Pump type number
CODE NO.: Pump item No.
PUMP NO.: Pump No.
IMP.: Impeller diameter
WEEK/YEAR: Production week and year

DESMI Pumping Technology A/S 4
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
2.2 EXPLANATION OF THE TYPE NUMBER
All the S-N pumps are provided with a name plate. The type number indicated on the name plate is
built up as follows:
SXXX-YYY-ZZZN-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: RG5, Impeller: AlBz.
E : Casing and shaft seal cover: NiAlBz and bronze alloy. Impeller and sealing rings: NiAlBz.
U : Nonmagnetic
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.
2.3 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 name plate 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.

DESMI Pumping Technology A/S 5
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
The permissible loads on the flanges appear from the following table:
Pump
Fv
N
Fh
N
F
N
Mt
Nm
S32-25-110N
1250
950
1550
200
S50-32-135N
1250
950
1550
200
S70-50-175N
1350
1000
1700
200
S70-50-220N
1350
1000
1700
200
S70-50-275N
1350
1000
1700
250
S80-70-175N
1450
1050
1800
270
S80-70-220N
1450
1050
1800
270
S80-70-275N
1450
1050
1800
270
S100-80-175N
1800
1250
2200
470
S100-80-220N
1800
1250
2200
470
S100-80-275N
1800
1250
2200
470
S125-80-220N
3200
1900
3750
950
S125-80-275N
3300
2000
3850
1020
S125-100-220N
3300
2000
3850
1020
In connection with the permissible loads on the flanges the following is to be observed:
v
F
zin
F
zout
F+
3
2
h
F
Fyout Fxout Fyin Fxin +++ 2222
t
M
Mzout Myout Mxout Mzin Myin Mxin +++++ 222222
2
22



















+


t
M
calcM
F
calcF
where index "in" is suction branch, "out" is pressure branch, and "calc" are the values calculated by
the user

DESMI Pumping Technology A/S 6
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
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 pump must be installed with horizontal shaft and the pump casing discharge side
vertically upwards.
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 abt. 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.
Be careful when fitting the suction line to the pump so that it is absolutely tight, as even small
leakages may impede the priming. When pumping polluted liquids a strainer is necessary. The
strainer must be equipped with a sieve, the passage area of which is to be 3 x the area of the
suction pipe. The mesh size is to be 1-3 mm smaller than the impeller gap of the pump in question.
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.

DESMI Pumping Technology A/S 7
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
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
S32-25-110N
21.5
S80-70-275N
86.0
S50-32-135N
22.0
S100-80-175N
79.0
S70-50-175N
42.0
S100-80-220N
92.5
S70-50-220N
58.0
S100-80-275N
107.0
S70-50-275N
72.0
S125-80-220N
116.0
S80-70-175N
53.0
S125-80-275N
122.0
S80-70-220N
59.0
S125-100-220N
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.

DESMI Pumping Technology A/S 8
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
Only S32-25-110N and S50-32-135N:
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 S32-25-110N), 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 S32-25-110N and S50-32-135N:
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 S32-25-110N and S50-
32-135N).
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 S32-25-110N and S50-32-135N)
- 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.
- Non-return flap: Check for cracks and hardness
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 S32-25-110N or S50-32-135N).
6.3 FITTING WATER DEFLECTOR
Assemble the bearing housing and the shaft seal cover. Lead the water deflector over the shaft until
it touchesthe shaft sealcover andthenfurther 1-1.5mm into the shaft sealcover(the bearinghousing
in S32-25-110N or S50-32-135N).

DESMI Pumping Technology A/S 9
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
6.4 FITTING SHAFT SEAL
Before fitting the seat, clean the recess in the shaft seal cover (bearing housing in S32-25-110N and
S50-32-135N). When fitting the seat, remove the protective coating, if any, without scratching the
lapped surface. Dip the outer rubber ring of the seat into soapy water. 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 soapy water and push it over the
shaft. The use of a fitting bush as shown on the below 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 S32-25-110N and S50-32-135N:
Apply Loctite 243 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.
Tighten the impeller with 60 Nm torque.
6.6 FITTING GUIDE RING AND GUIDE VANE PIECE (ONLY S32-25-110N)
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 theshaft seal inthe bearing housing. If theshaft 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.
Fitting bush

DESMI Pumping Technology A/S 10
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
S32-25-110N:
Place the gasket (21) between pump casing and bearing housing on the bearing housing. Check that
the non-return 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.
S50-32-135N:
Place the gasket (21) between pump casing and bearing housing on the bearing housing. Lead the
bearing housinginto place and fasten. Note that the drain passagefor 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 in the inlet cover 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.
If the pump has been pumping cold or very hot liquids, be aware that touching the pump
surface is dangerous. Therefore, the necessary precautionary measures must be taken.
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 closed discharge valve for a short
time (max. 5 minutes and at a max. temperature of 80°C for standard pumps). Otherwise there is a
risk of damage to the pump and, at worst, of a steam explosion. If the pump is not monitored, the
installation of a safety device is recommended.
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.

DESMI Pumping Technology A/S 11
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
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 electric 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 fault-finding 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.
FAULT
CAUSE
REMEDY
The pump does not
Prime
1. The pump is not filled
with liquid
2. Leaking non-return
valve in pump
3. Wrong direction of rotation
4. Air is drawn in because
of too little liquid or
leaking suction line
5. Liquid lock in outlet
line
6. Temperature of liquid
too high
7. Air cannot escape on
pressure side
Fill pump casing with liquid
Remove foreign body in
valve/Remove any coating
on mating faces
Change direction of
rotation
Lower suction pipe/
Tighten suction line
Change the pressure line
so that the air can pass out
freely
Replace liquid in pump
casing/Wrong dimen-
sioning/Contact DESMI
Ventilate the system
The pump has no or
too low capacity
1. Wrong direction of
rotation
2. Piping system choked
3. The pump is choked
4. Suction line leaks
Pump takes air
5. Suction lift too high
6. Pump and piping system
wrongly dimensioned
Change direction of
rotation to clockwise when
viewed from shaft end (the
direction of the arrow)
Clean or replace
Clean the pump
Find the leakage/repair the
fault, non-return valve not
submerged
Check data sheet Q/H
curve and NPSH or
contact DESMI
As 5
FAULT
CAUSE
REMEDY

DESMI Pumping Technology A/S 12
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
The pump uses too
much
power
1. Counter-pressure too
low
2. The liquid is heavier
than water
3. Foreign body in pump
4. Electric motor is
running on 2 phases
Insert orifice plate or
check valve/Contact
DESMI
Contact DESMI
Dismantle the pump,
remove the cause
Check fuses, cable
connection, and cable
The pump makes
noise
1. Cavitation in pump
Suction lift too high/
Suction line wrongly
dimensioned/Liquid
temperature too high
11. INSPECTION AND MAINTENANCE
Inspect the shaft seal for leaks at regular intervals (leak through the hole in the lower part of the shaft
seal cover)
Activate the relief valve at regular intervals in order to check the function. If the valve is choked,
replace or clean it, if possible.
- Before inspection of a pump without guard check that the pump cannot be started unintentionally.
- The system is to be without pressure and drained of liquid.
- The repairman must be familiar with the type of liquid which has been pumped as well as the
safety measures he is to take when handling the liquid.
11.1 DRAINING THE PUMP
When the piping system has been drained, note that there is still liquid in the pump. Removethe liquid
by dismantling the pipe plug (75) in the inlet cover of the pump.
11.2 BEARINGS
The pump is equipped with ball bearings with a nominal life of 25,000 working hours when direct
coupled to electric motor, whereas the nominal life with overhanging V-belt drive is about 10,000
working hours. The bearings are lubricated for life and require no attention but are to be replaced in
case of noise or bearing wear.
12. REPAIRS
12.1 ORDERING SPARE PARTS
When ordering spare parts please always state pump type and pump No. (appears on the name plate
of the pump). See also spare parts drawing with item Nos.

DESMI Pumping Technology A/S 13
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
13. OPERATING DATA
The following working pressures are allowed:
Pump
S32-25-110N
S50-32-135N
S70-50-175N
S70-50-220N
S70-50-275N
PRESSUR
E mWC
45
45
65
100
150
Pump
S80-70-175N
S80-70-220N
S80-70-275N
S100-80-175N
S100-80-220N
PRESSUR
E mWC
65
100
160
65
100
Pump
S100-80-275N
S125-80-220N
S125-80-275N
S125-100-220N
PRESSUR
E mWC
150
100
150
100
(10.2 mWC = 1 bar)
The above-mentioned max. working pressure is NOT valid for pumps approved by a classification
society. Pumps approved by classification societies have been pressure tested according to the
requirements of these societies, i.e. a test pressure of 1.5 x the permissible working pressure. The
test pressure is stated in the test certificate and stamped into the discharge flange of the pump.
The powers stated in the table below are the highest possible absorbed by the pump, whereas the
min./max. values for flow and pressure indicate DESMI's recommended operating range for the pump
with the biggest impeller.
Pump
Max. Power
kw
1450/1750/-
2950/3500 RPM
Min. Flow
m3/h
1450/1750/-
2950/3500 RPM
Max. Fflow
m3/h
1450/1750/-
2950/3500 RPM
Min. Pressure
mVS
1450/1750/-
2950/3500 RPM
Max. Pressure
mVS
1450/1750/-
2950/3500 RPM
S32-25-110N
0.2/0.3/0.9/1.4
2.5/3.0/4.5/5.5
6.0/7.0/12.0/13.5
1.7/2.8/8.0/12.5
3.6/5.3/15.0/21
S50-32-135N
0.3/0.5/2.1/3.5
4,0/4,5/8,0/9,0
11,0/13,5/23/27
3.0/4.2/12.0/17.0
6.0/8.7/25/35
S70-50-175N
0.8/1.2/6.0/10.0
8.0/10.0/17.5/20
20/24/45/53
5.6/8.4/19.0/27
9.2/13.5/38/53
S70-50-220N
1.6/2.7/12.3/20.5
8,0/9,0/15/20
24/27/45/55
5.5/9.5/31/40
14.2/21/63/86
S70-50-275N
3.5/6.0/22/35
10,0/12,0/14,0/16,0
26/32/32/38
16.0/21/88/123
24/34/103/143
S80-70-175N
1.1/1.8/8.3/13.5
16,0/17,5/30/35
39/48/80/95
4.6/6.0/16.5/23
8.7/12.5/36/50
S80-70-220N
2.4/4.2/18.5/31
15,5/18,5/30/35
43/53/80/95
9.5/13.0/42/59
15.5/22/64/90
S80-70-275N
4.4/7.4/32/53
15,0/18,0/30/35
40/50/80/95
16/22/67/94
25/36/103/143
S100-80-175N
1.6/2,8/12.5/21
30/35/60/70
70/85/150/170
4.6/6.2/15.0/24
8.3/12.2/34/48
S100-80-220N
3.5/6.1/27/47
28/37/58/80
85/97/170/190
7.0/9.2/31/48
14,6/21/60/82
S100-80-275N
6.8/12.0/55/92
35/40/70/80
85/100/160/180
13.5/19.5/60/90
23/33/93/130
S125-80-220N
4.5/8.0/36.5/61
60/65/100/120
135/150/240/250
5.3/10.0/30/54
12.4/19.0/55/77
S125-80-275N
8.5/15.0/70/118
50/60/100/120
120/145/220/260
14.0/19.8/62/88
24/34/94/131
S125-100-
220N
5.4/9.5/46/74
70/85/140/140
170/200/300/320
6.7/10.2/34/54
12.2/17.8/51/73

DESMI Pumping Technology A/S 14
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
14. EC DECLARATION OF CONFORMITY
DESMI PUMPING TECHNOLOGY A/S, hereby declare that our pumps of the type Modular
S-N are manufactured in conformity with the following essential safety and health
requirements in the COUNCIL DIRECTIVE 2006/42/EC on machines, Annex 1.
The following harmonized standards have been used:
EN/ISO 13857:2008
Safety of machinery. Safety distances to prevent danger zones
being reached by the upper limbs
EN 809:1998 + A1:2009
Pumps and pump units for liquids –Common safety requirements
EN12162:2001+A1:2009
Liquid pumps –Safety requirements –Procedure for hydrostatic
testing
EN 60204-1:2006/A1:2009
Safety of machinery –Electrical equipment of machines (item 4,
General requirements)
Pumps delivered by us connected with prime movers are CE-marked and comply with the
above requirements.
Pumps delivered by us without prime movers (as partly completed machinery) must only be
used when the prime mover and the connection between prime mover and pump comply with
the above requirements.
Nørresundby, March 05 2019
Henrik Mørkholt Sørensen
Managing Director
DESMI Pumping Technology A/S
Tagholm 1
9400 Nørresundby

DESMI Pumping Technology A/S 15
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
15. INFORMATION RELEVANT FOR DISASSEMBLY OR DISPOSAL AT END-OF-LIFE
No damage materials are used in DESMI pumps –please refer to DESMI Green Passport (can be
sent on request –contact a DESMI sales office) –i.e. common recycling companies can handle the
disposal at end-of-life. Alternatively the pump and motor can be returned to DESMI at end-of-life for
safe recycling.

DESMI Pumping Technology A/S 16
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
16. ASSEMBLY DRAWINGS
Assembly drawings of S32-25-110N and S50-32-135N are shown on the next pages.
17. SPARE PARTS LISTS
Spare parts lists for S32-25-110N and S50-32-135N are shown on the next pages.
1 Pump casing 11 Water deflector 21 Gasket
2 Pipe plug 12 Ring lock 22 Allen screw
3 Pipe plug 13 Ball bearing 23 Suction piece
4 Sealing ring 14 Support disc 24 Allen screw
5 Impeller 15 Ball bearing 25 Non-return flap
6 Nut 16 Sunk key 26 Contact ring
7 Spring collar 17 Shaft 27 Gasket
8 Washer 18 Bearing housing 28 Gasket
9 Sunk key 19 Allen screw 29 O-ring
10 Mechanical shaft seal 20 Shaft seal cover 75 Drain plug
76 Relief valve

DESMI Pumping Technology A/S 17
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
ASSEMBLY DRAWING S32-25-110N
Assembly drawing of S50-32-135N is shown on the next page.
SPARE PARTS LIST S32-25-110N
Spare parts list for S50-32-135N is shown on the next page.
1 Pump casing 18 Bearing housing 29 Allen screw
3 Pipe plug 21 Gasket 30 Ring lock
5 Impeller 22 Allen screw 31 Oil seal ring
10Mech. shaft seal 23 Suction piece 32 Reducing bush
11Water deflector 24 Allen screw 33 Gasket
14Support disc 25 Non-return flap 34 Shim
15Ball bearing 26 Guide vane piece 35 Guide ring
16Sunk key 27 Contact ring 75 Drain plug
17Shaft 28 Sealing washer 76 Relief valve

DESMI Pumping Technology A/S 18
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
ASSEMBLY DRAWING S50-32-135N
SPARE PARTS LIST S50-32-135N
1 Pump casing 16 Sunk key 25 Non-return flap
3 Pipe plug 17 Shaft 26 Contact ring
5 Impeller 18 Bearing housing 28 Sealing washer
10 Mech. shaft seal 21 Gasket 29 O-ring
11 Water deflector 22 Allen screw 30 Ring lock
14 Support disc 23 Suction piece 31 Oil seal ring
15 Ball bearing 24 Allen screw 75 Drain plug
76 Relief valve

DESMI Pumping Technology A/S 19
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
18. DIMENSIONAL SKETCH
See also table on the next page
Type
A
B
C
H
E
F
d
h
b
J
K
L
M
N
S32-25-110N
100
237
40
234
155
132
19j6
21,5
6
12
110
140
10
56
S50-32-135N
84
237
40
234
140
132
19j6
21,5
6
12
110
140
10
56
S70-50-175N
125
355
50
270
180
160
24j6
27
8
15
145
175
10
55
S70-50-220N
134,5
352
50
330
220
190
24j6
27
8
15
170
200
12
68
S70-50-275N
140
350
50
390
240
225
24j6
27
8
19
170
210
12
75
S80-70-175N
150,5
363
50
295
200
180
24j6
27
8
15
190
220
13
69
S80-70-220N
155
365
50
330
220
190
24j6
27
8
15
190
220
12
70
S80-70-275N
150
360
50
390
250
225
24j6
27
8
19
170
210
12
75
S100-80-175N
175,5
374
50
344
240
200
24j6
27
8
15
220
270
13
72
S100-80-220N
180
376
50
400
280
250
24j6
27
8
19
225
265
15
90
S100-80-275N
180
465
80
425
280
250
32j6
35
10
19
225
265
14
90
S125-80-220N
204
480
80
424
280
250
32j6
35
10
19
260
300
16
95
S125-80-275N
202
480
80
454
300
260
32j6
35
10
19
260
300
14
90
S125-100-
220N
235
500
80
476
315
280
32j6
35
10
19
330
370
16
105

DESMI Pumping Technology A/S 20
Tagholm 1
9400 Nørresundby –Dänemark
Tlf. nr.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com
Type
O
P
D1
K1
Dn1
l1
D2
k2
Dn2
L2
Q
R
S32-25-110N
160
230
—
—
1¼"
BSP
—
—
...
1"
BSP
—
...
1/2"
BSP
S50-32-135N
160
230
—
—
2"
BSP
__
—
-
1¼"
BSP
.„
-
1/2"
BSP
S70-50-175N
190
250
185
145
70
4x18
165
125
50
4x18
1/4"
BSP
1/2"
BSP
S70-50-220N
230
300
185
145
70
4x18
165
125
50
4x18
1/4"
BSP
1/2"
BSP
S70-50-275N
280
360
185
145
70
4x18
165
125
50
4x18
1/4"
BSP
1/2"
BSP
S80-70-175N
200
273
200
160
80
8x18
185
145
70
4x18
1/4"
BSP
3/4"
BSP
S80-70-220N
230
305
200
160
80
8x18
185
145
70
4x18
1/4"
BSP
3/4"
BSP
S80-70-275N
280
360
200
160
80
8x18
185
145
70
4x18
1/4"
BSP
3/4"
BSP
S100-80-175N
230
319
220
180
100
8x18
200
160
80
8x18
1/4"
BSP
3/4"
BSP
S100-80-220N
265
365
220
180
100
8x18
200
160
80
8x18
1/4"
BSP
3/4"
BSP
S100-80-275N
280
380
220
180
100
8x18
200
160
80
8x18
1/4"
BSP
3/4"
BSP
S125-80-220N
280
382
250
210
125
8x18
200
160
80
8x18
1/4"
BSP
3/4"
BSP
S125-80-275N
320
414
250
210
125
8x18
200
160
80
8x18
1/4"
BSP
3/4"
BSP
S125-100-220N
320
445
250
210
125
8x18
220
180
100
8x18
1/4"
BSP
3/4"
BSP