Desmi NSLV Compact Spacer Troubleshooting guide

OPERATION AND MAINTENANCE INSTRUCTIONS
DESMI end suction centrifugal pump
NSLV and NSLH Compact Spacer
DESMI Pumping Technology A/S
Tagholm 1 –DK-9400 Nørresundby –Denmark
Tel.:
[phone]
Fax:
[phone]
E-mail:
[email protected]
Internet:
www.desmi.com
Manual:
T1514
Language:
English
Revision:
A(08/21)
Special pump No. ...............................................

TABLE OF CONTENTS: PAGE
1. PRODUCT DESCRIPTION ................................................................................................................................. 2
1.1 DELIVERY............................................................................................................................................................. 2
2. TECHNICAL DATA ............................................................................................................................................. 2
2.1 EXPLANATION OF THE TYPE NUMBER.........................................................................................................2
2.2 TECHNICAL DESCRIPTION .............................................................................................................................. 3
3. INSTALLATION................................................................................................................................................... 5
3.1 MOUNTING/FASTENING ................................................................................................................................... 5
3.2 WIRING.................................................................................................................................................................. 5
4. TRANSPORT/STORAGE ................................................................................................................................... 5
5. DISMANTLING..................................................................................................................................................... 6
5.1 ACCESS TO IMPELLER...................................................................................................................................... 6
5.2 DISMANTLING SHAFT SEAL.............................................................................................................................6
5.3 DISMANTLING SEAT...........................................................................................................................................7
5.4 DISMANTLING BEARING...................................................................................................................................7
5.5 INSPECTION.........................................................................................................................................................7
6. ASSEMBLING...................................................................................................................................................... 7
6.1 FITTING SEALING RINGS.................................................................................................................................. 7
6.2 FITTING BEARING............................................................................................................................................... 7
6.3 FITTING WATER DEFLECTOR .........................................................................................................................7
6.4 FITTING SHAFT SEAL.........................................................................................................................................7
6.5 FITTING IMPELLER.............................................................................................................................................8
6.6 FITTING SHAFT SEAL COVER.......................................................................................................................... 8
6.7 FITTING COUPLING............................................................................................................................................8
6.8 SHAFT....................................................................................................................................................................9
7. FROST PROTECTION........................................................................................................................................ 9
8. DISMANTLING..................................................................................................................................................... 9
9. START-UP............................................................................................................................................................ 9
9.1 START-UP........................................................................................................................................................... 10
10. SYSTEM BALANCING ....................................................................................................................................10
11. INSPECTION AND MAINTENANCE ..............................................................................................................12
11.1 DRAINING THE PUMP.................................................................................................................................... 12
11.2 BEARING.......................................................................................................................................................... 12
12. REPAIRS...........................................................................................................................................................13
12.1 ORDERING SPARE PARTS...........................................................................................................................13
13. OPERATING DATA..........................................................................................................................................14
14. EU & UK DECLARATION OF CONFORMITY...............................................................................................15
15. INFORMATION RELEVANT FOR DISASSEMBLY OR DISPOSAL AT END-OF-LIFE............................16
16. ASSEMBLY DRAWING Ø215/265 .................................................................................................................17
17. SPARE PARTS LIST Ø215/265......................................................................................................................17
18. ASSEMBLY DRAWING Ø330/415 WITH LIGHT BEARING HOUSING.....................................................18
20. ASSEMBLY DRAWING Ø330/415 WITH HEAVY BEARING HOUSING ...................................................19
21. SPARE PARTS LIST Ø330/415 WITH HEAVY BEARING HOUSING........................................................19
22. DIMENSIONAL SKETCH.................................................................................................................................19

DESMI Pumping Technology A/S 2
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
1. PRODUCT DESCRIPTION
These operation and maintenance instructions apply to the DESMI NSLV and NSLH Compact
Spacer pump. The NSLV pump is constructed for vertical mount (with suction flange downwards)
and the NSLH pump for horizontal mount.
The pump is a single-stage end suction centrifugal pump equipped with stainless steel shaft,
mechanical shaft seal, and closed impeller.
The pump is suitable for the pumping of liquids with temperatures up to 80oC. With special shaft seal
up to 120oC. Max. working pressure and number of revolutions are indicated under Operating Data.
The pump is particularly suitable for the pumping of water in connection with cooling systems, cooling
of diesel engines, as bilge pumps, ballast pumps, fire pumps, brine pumps, pumps for irrigation, fish
farms, water works, district heating, salvage corps, army and navy, etc.
The descriptions in the operation and maintenance instructions are divided into two parts covering
the groups ø215/265 and ø330/415, as the designs of these two groups are different. The numbers
refer to the standard impeller diameter of the pump. E.g.:
ø215/265: Pumps with ø215 or ø265 impellers:
The back of the impeller is equipped with relief blades to reduce the load on the bearings.
ø330/415: Pumps with ø330 and ø415 impellers:
The back and the front of the impeller are equipped with sealing rings and relief holes to reduce the
load on the bearings.
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 NSLV and NSLH pumps are provided with a name plate. The type number indicated on the
name plate is built up as follows:
NSLVXXX-YYY/MR-Z or NSLHXXX-YYY/MR-Z
XXX: Pressure branch diameter, YYY: Standard impeller diameter
M: The material combination of the pump.
R: The assembly combination of the pump.
Z: Other variants

DESMI Pumping Technology A/S 3
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
M may be the following:
A: Casing and shaft seal cover : Cast iron + cast iron alloy. Impeller and sealing rings: Bronze
B: Casing and shaft seal cover : Cast iron + cast iron alloy. Impeller and sealing rings: Stainless.
C: All cast iron
D: Casing and shaft seal cover: Bronze or NiAlBz. Impeller and sealing rings: NiAlBz or stainless
steel
E: Special materials
U: Nonmagnetic material
The pumps can be delivered in other material combinations accordingto agreement with the supplier.
R may be the following:
02: Monobloc, with bearing in the pump
07: Mounted on base plate with electric motor
09: Pump with bare shaft end
12: Monobloc, without bearing in the pump
13: Spacer, light bearing housing
14: Spacer, heavy bearing housing
15: Spacer, heavy bearing housing and heavy motor bracket (special motor bracket)
16: Compact spacer (i.e. pumps shown in this manual)
Z may be the following:
i : PN16 flanges
j : PN25 flanges
k : Special flange
l : Other shaft seal
m : BS flanges
n : ANSI flanges
o : Shockproof design
p : Other design
q : JIS flanges
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 and E 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 indicated is the airborne noise including the motor. The noise 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 noise level is for pumps with electric motors.
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 4
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
The permissible loads on the flanges appear from the following table. The values apply to standard
pumps in bronze (Rg5) and cast iron (GG20). As to pumps in SG iron (GGG40) or NiAlBz the
values are to be increased by a factor 1.5.
Pump size
Fy
N
Fz
N
Fx
N
∑F
My
Nm
Mz
Nm
Mx
Nm
∑Mt
65-215
65-265
650
840
750
1340
510
310
380
700
80-215
80-265
80-330
800
950
850
1500
550
350
400
750
100-215
100-265
100-330
100-415
1000
1250
1150
2000
650
400
500
900
125-215
125-265
125-330
125-415
1250
1600
1430
2500
830
520
650
1160
150-265
150-330
150-415
1500
1900
1700
2950
1000
650
800
1400
200-265
200-330
200-415
2000
2520
2260
3920
1330
860
1060
1860
250-330
250-415
2500
3150
2820
4900
1770
1140
1400
2470
300-415
3000
3750
3350
5860
2750
1900
2200
4000
In connection with the permissible loads on the flanges the following is to be observed:
2
M
calc
M
+
F
calc
F
t
2 2






















DESMI Pumping Technology A/S 5
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
where index "calc" is the values calculated by the user.
At the same time none of the forces or moments may exceed the indicated figure multiplied by 1.4.
3. INSTALLATION
3.1 MOUNTING/FASTENING
The pump should be mounted and fastened on a solid base plate or wall mounted frame so distortion
is avoided.
The max. permissible loads on the flanges stated in paragraph 2.2 are to be observed.
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.
3.2 WIRING
Wiring to be carried out by authorised skilled workmen according to the rules and
regulations in force.
4. TRANSPORT/STORAGE
The weights of the pumps in A and D combination (without motor) are stated in the following table,
and the pumps are to be lifted as shown below.
Pump size
Weight in kg
A16 / D16
Pump size
Weight in kg
A16 / D16
65-215
176 / 191
125-330
306 / 312
65-265
184 / 201
125-415
414 / 434
80-215
187 / 204
150-265
256 / 289
80-265
185 / 202
150-330
369 / 359
80-330
276 / 281
150-415
459 / 479
100-215
198 / 213
200-265
335 / 375
100-265
203 / 224
200-330
439 / 424
100-330
291 / 297
200-415
554 / 574
100-415
379 / 399
250-330
519 / 509
125-215
217 / 241
250-415
634 / 639
125-265
221 / 246
300-415
734 / 734
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 pumps are to be lifted in the following way:

DESMI Pumping Technology A/S 6
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
NSLV: NSLH:
The lifting straps must not bear against sharp edges and corners.
5. DISMANTLING
5.1 ACCESS TO IMPELLER
The numbers in brackets refer to the position numbers on the assembly drawing.
Dismantle guard (69). Dismantle copper pipe (58). Dismantle Allen screws (76) and (80). Remove
coupling discs (74) between spacer and coupling part motor (71). Dismantle Allen screws (77).
Loosen spacer (72) from coupling part pump (70) by means of the pointed screws (36). Now remove
spacer. If additional space is required for dismantling, loosen coupling part pump (70) and coupling
part motor (71) at pointed screws (73) and pull off. A gentle heating of the pump and motor coupling
parts may facilitate the dismantling.
Remove the screws (22) that keep the shaft seal cover (18) to the pump casing (1). Loosen shaft
seal cover (18) from pump casing by means of the pointed screws (86) in the shaft seal cover. The
shaft seal cover with shaft and impeller can now be lifted up allowing inspection of the impeller.
5.2 DISMANTLING SHAFT SEAL
ø215/265
Remove nut (6). Pull off the impeller (5) and remove sunk key (9). Remove Allen screws (19),
which hold the bearing cover (15) to the shaft seal cover, pull shaft seal cover and bearing cover
apart, by which shaft seal (10) and water deflector (11) are pulled off the shaft.
ø330/415
Remove set screw (6). Pull off the impeller (5) and remove sunk key (9). Remove set screws (19),
which hold the bearing cover (15) to the shaft seal cover, pull shaft seal cover and bearing cover
apart, by which the shaft seal (10) is pulled off the shaft.

DESMI Pumping Technology A/S 7
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
5.3 DISMANTLING SEAT
Press out the seat from behind the shaft seal cover (18).
5.4 DISMANTLING BEARING
Before dismantling bearing, remove ring lock (12). Pull shaft with coupling out of the bearing cover
and press out the bearing.
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.
- 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 RINGS
When fitted, the sealing ring (4) has to bear against the shoulder of the pump casing.
ø330/415
When fitted the sealing ring (27) has to bear against the shoulder of the shaft seal cover (20).
6.2 FITTING BEARING
Place the support disc (14) (grease valve ring in ø330/415 with angular ball bearings) in the
bearing cover and press the bearing into place in the bearing cover. Lead the shaft through the
bearing cover, support disc and bearing, and press the bearing into place up against the support
disc. Fit ring lock (12).
ø330/415
Fit cover under bearing (26).
6.3 FITTING WATER DEFLECTOR
ø215/265
Assemble bearing cover and shaft seal cover. Lead the water deflector (11) over the shaft until it
touches the shaft seal cover and then further 1-1.5 mm into the shaft seal cover. Do not fasten
bearing cover and electric motor until motor and coupling have been mounted and the shaft can
rotate freely without noise.
ø330/415
Lead the water deflector (11) over the shaft until it touches the cover under bearing (26) and then
further 1-1.5 mm towards the cover under bearing. Assemble bearing cover and shaft seal cover.
Do not fasten bearing cover and electric motor until motor and coupling have been mounted and
the shaft can rotate freely without noise.
6.4 FITTING SHAFT SEAL
Pay attention to the rubber type of which the shaft seal bellows has been made. Standard is
NITRILE, however EPDM may also be used. EPDM will be damaged by mineral grease. For
EPDM use soft soap or silicone grease. Before fitting the seat, clean the recess in the shaft seal
cover. Dip the outer rubber ring of the seat into soapy water or apply silicone grease. Now press
the seat into place with the fingers and check that all parts are correctly imbedded.

DESMI Pumping Technology A/S 8
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
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 surface of the slide ring rubber bellows with
soapy water and push it over the shaft. The use of a conical fitting bush 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 soapy water 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 in bearing
cover/shaft seal cover 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 washers (7 and 8) and a nut (ø215/265) or a set screw (ø330/415). Secure set screw (6) or
nut (6) with a removable screw locking agent, e.g. Loctite 243 or Omnifit 40M. Tighten according to
below table.
6.6 FITTING SHAFT SEAL COVER
Place the O-ring (21) between pump casing and shaft seal cover in the O-ring groove and hold it
with a little grease. However, check the material of the O-ring first. As standard the material is
NITRILE, but it may be EPDM which will be damaged by mineral grease. Use soft soap or silicone
grease for EPDM. Fit and fasten shaft seal cover or motor bracket, mounted with the electric
motor, in the pump casing. Screw the pointed screws (86) back into the shaft seal cover before
tightening. Tighten the screws in the shaft seal cover according to below table. Fit copper pipe
(58).
6.7 FITTING COUPLING
Fit sunk key (16) and motor shaft sunk key. Lead coupling part pump (70) against the shoulder of
the shaft (17) and tighten by means of pointed screw (73). Mount coupling part motor (71). Do not
tighten the pointed screw (73) into the coupling part motor until the remaining parts of the coupling
have been mounted and tightened. Mount spacer (72) by means of Allen screws (77). Secure the
screws with a removable screw locking agent.
Mount coupling discs (74) and washer (78) between spacer and coupling part motor by means of
Allen screws (76), pinch nuts (79) and Allen screws (80). Secure screws with a removable screw
locking agent. Turn the shaft a couple of times while tightening each screw slightly until coupling
discs and coupling part motor have come into place. Now tighten Allen screws and pointed screw
(73) in coupling part motor.
Check radial runouton the flanges, where the coupling plates aremounted, by meansof a measuring
gauge fixed to the motor bracket - see below drawing. After tightening-up the Allen screws (76 and
80) check that the radial runout does not exceed 0.1 mm. A larger runout may result in pump
vibrations, increased bearing load and/or the impeller getting into contact with the pump sealing
ring(s).

DESMI Pumping Technology A/S 9
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
Tighten Allen screws in the coupling according to below table.
Screw dimension
Moment in Nm
M8
8
M10
15
M12
27
M16
65
M20
127
6.8 SHAFT
When the pump has been assembled, check that the shaft rotates freely and without noise.
7. FROST PROTECTION
Pumps which are not in operation during frost periods are to be drained to avoid frost damage.
Remove the plug (3) 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 centrifugal pump will not function until it has been filled with liquid between the foot valve and
somewhat above the impeller of the pump.
The liquid also serves as coolant for the shaft seal. In order to protect the shaft seal the
pump must not run dry.

DESMI Pumping Technology A/S 10
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
ATTENTION
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.
9.1 START-UP
Before starting the pump check that:
- the shaft rotates freely without jarring sounds.
- the pump casing and the suction line are 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 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 .

DESMI Pumping Technology A/S 11
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
FAULT
CAUSE
REMEDY
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
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

DESMI Pumping Technology A/S 12
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
11. INSPECTION AND MAINTENANCE
Inspect the shaft seal for leaks at regular intervals.
- 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.
The drain hole at the mechanical shaft seal must be inspected regularly (see drawing example
below). Clean the drain hole as needed. If the drain hole clogs up, leaking liquid and/or vapors
from the shaft seal can be forced up into the bearing unit, which can result in a much shorter
bearing life than normal.
DRAIN HOLE FOR SHAFT SEAL
11.1 DRAINING THE PUMP
When the piping system has been drained, note that there is still liquid in the pump. Remove the
liquid by dismantling the pipe plug (3) at the bottom of the pump.
11.2 BEARING
ø215/265
The bearing in the 02-combination is dimensioned for a nominal life of 25,000 working hours. The
bearing is lubricated for life and requires no attention but is to be replaced in case of noise or
bearing wear.
ø330/415
The bearing is dimensioned for a nominal life of 100,000 working hours and is to be relubricated
according to the below table. The bearing is to be replaced in case of noise or bearing wear.
Light bearing housing ø330/415 (single-row ball bearing in 80-330, 100-330, 125-330, 100-415
and 125-415)
The bearing is to be re-lubricated through the lubricator nipple (84) in the bearing cover (15). In
connection with replacement, the bearings are to be mounted with the RS - sealing facing
downwards, fill the bearing itself with grease and place a grease bead on the bearing towards the
shaft in a quantity corresponding to the table below.

DESMI Pumping Technology A/S 13
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
Heavy bearing housing ø330/415 (two angular ball bearings in pumps not mentioned above)
The bearings are to be re-lubricated through the lubricator nipple (84) in the bearing cover (15). Fill
the bearings with grease and place a grease bead on the bearing towards the shaft in a quantity
corresponding to the table below.
Pump
Assembly
Interval
Quantity
80-330
100-330
125-330
100-415
125-415
Light bearing
housing
4500 hours
30 g
150-330
200-330
250-330
150-415
Heavy bearing
housing
4500 hours
40 g
200-415
250-415
300-415
Heavy bearing
housing
4500 hours
50 g
200-525
300-525
Heavy bearing
housing
4500 hours
80 g
If the pumped liquid temperature is below 80°C the following types of grease are recommended:
ESSO
Beacon 2
BP
Energrease EP grease 2
Shell
Alvania grease 2
Mobil
Mobil lux grease EP 2 eller Mobil plex 47
Castrol
Spherol AP 2
Texaco
Multifak EP 2
Q8
Rembrandt EP 2 eller Rubens
Statoil
Statoil Uniway u2
If the pumped liquid temperature is above 80°C, high-temperature grease is recommended, e.g.
SKF LGH P2/0.4.
DESMI use SKF LGHP2 as standard.
Note that relubrication can cause a (usually temporary) bearing temperature rise of up to approx.
20 °C - especially by mixing different types of grease and / or by overlubricating the bearing.
Grease used for relubrication must be compatible with the grease in the bearing unit.
12. REPAIRS
12.1 ORDERING SPARE PARTS
When ordering spare parts please always state pump type, serial No. (appears on the name plate of
the pump), position No. on the assembly drawing and designation on the spare parts list.

DESMI Pumping Technology A/S 14
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
13. OPERATING DATA
The following working pressures (pressure in piping incl. the pressureincrease caused by thepump),
number of revolutions and electric motors are allowed in standard pumps:
ø215 pumps are as standard available with motors up to frame size 225
ø265 pumps are as standard available with motors up to frame size 280
ø330 pumps are as standard available with motors up to frame size 315
ø415 pumps are as standard available with motors up to frame size 355
Pump size
Max.
working
pressure
[bar]
Bronze /
Cast iron
Max.
working
pressure
[bar]
SG-iron
Max.
RPM
Pump size
Max.
working
pressure
[bar]
Bronze /
Cast iron
Max.
working
pressure
[bar]
SG-iron
Max.
RPM
65-215
16
32
1800 / 3600
125-265
7
14
1800 / 1800
65-265
14.5
29
1800 / 3600
150-330
7 / 13
27
1800 / 1800
80-330
15 / 15
32
1800 / 3600
150-415
9 / 13
26
1800 / 1800
80-215
13
26
1800 / 3600
150-265
9
18
----- / 1800
80-265
14.5
29
1800 / 3600
200-330
7 / 13
26
1800 / 1800
100-330
8 / 14
29
1800 / 1800
200-415
9 / 13
26
1800 / 1800
100-415
10 / 12.5
25
1800 / 1800
200-265
10 / 10
20
---- / 1800
100-215
10
20
1800 / 3600
250-330
7 / 12
25
1800 / 1800
100-265
14.5
29
1800 / 3600
250-415
9 / 12
25
1800 / 1800
125-330
7 / 12
25
1800
300-415
9 / 12
25
1800 / 1800
125-415
9 / 13
26
1800 / 1800
300-525
14
25
1800 / 1800
125-215
8
16
----- / 1800
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.

DESMI Pumping Technology A/S 15
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
14. EU &UK DECLARATION OF CONFORMITY
DESMI A/S, hereby declare that our pumps of the NSLV and NSLH Compact Spacer type 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 ofmachinery. Safety distancesto prevent danger zonesbeing
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)
Ecodesign Directive (2009/125/EC).
Water pumps:
Commission Regulation No 547/2012.
Applies only to water pumps marked with the minimum efficiency
index MEI. See pump nameplate.
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, August 10 2021
Henrik Mørkholt Sørensen
Managing Director
DESMI Pumping Technology A/S
Tagholm 1
9400 Nørresundby

DESMI Pumping Technology A/S 16
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [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 17
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
16.ASSEMBLY DRAWING Ø215/265
17.SPARE PARTS LIST Ø215/265
See ø330/415 pump on the next pages
1 Pump casing 2 Pipe plug
3 Pipe plug
4 Sealing ring
5 Impeller
6 Nut
7 Spring collar
8 Washer
9 Sunk key
10 Shaft seal
11 Water deflector
12 Ring lock
13 Ball bearing
14 Support disc
15 Bearing cover
16 Sunk key
17 Shaft
18 Shaft seal cover
19 Allen screw
21 O-ring
22 Allen screw
36 Pointed screw
58 Copper pipe (only on NSLV)
59 Hexagon nipple (Plug on NSLH)
60 Set screw
63 Motor bracket
64 Set screw
65 Intermediate flange *)
66 Allen screw *)
67 Set screw
69 Guard
70 Coupling part pump
71 Coupling part motor
72 Spacer
73 Pointed screw
74 Coupling discs
76 Allen screw
77 Allen screw
78 Washer
79 Pinch nut
80 Allen screw
81 Sealing washer
86 Pointed screw
96 Pressure gauge
97 Nipple
98 Sleeve
106 Pressure gauge cock
*) Only if motor is bigger than motor
bracket

DESMI Pumping Technology A/S 18
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail] www.desmi.com
18.ASSEMBLY DRAWING Ø330/415 WITH LIGHT BEARING HOUSING
(80-330, 100-330, 125-330, 100-415 and 125-415)
19. SPARE PARTS LIST ø330/415 with light bearing housing
1 Pump casing
2 Pipe plug
3 Pipe plug
4 Sealing ring
5 Impeller
6 Nut
7 Spring collar
8 Washer
9 Sunk key
10 Shaft seal
11 Water deflector
12 Ring lock
13 Ball bearing
14 Support disc
15 Bearing cover
16 Sunk key
17 Shaft
18 Shaft seal cover
19 Allen screw
21 O-ring
22 Allen screw
27 Sealing ring 2
36 Pointed screw
58 Copper pipe (only NSLV)
59 Hexagon nipple (Plug on NSLH)
60 Set screw
63 Motor bracket
64 Set screw
65 Intermediate flange*)
66 Allen screw*)
67 Set screw
69 Guard
70 Coupling part pump
71 Coupling part motor
72 Spacer
73 Pointed screw
74 Coupling discs
76 Allen screw
77 Allen screw
78 Washer
79 Pinch nut
80 Allen screw
81 Sealing washer
86 Pointed screw
96 Pressure gauge
97 Nipple
98 Sleeve
106 Pressure gauge cock
*) Only if motor is bigger than motor
bracket