Desmi NSLH Manual

__________________________________________________________________________________
DESMI Pumping Technology A/S
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
OPERATION AND MAINTENANCE INSTRUCTIONS
DESMI end suction centrifugal pump
NSLH and NSLV 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:
T1529
Language:
English
Revision:
J(07/22)
Special pump No. .................

__________________________________________________________________________________
DESMI Pumping Technology A/S
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
Table of Contents:
1. PRODUCT DESCRIPTION ...............................................................................................................................1
1.1 DELIVERY .............................................................................................................................................................1
2. TECHNICAL DATA .........................................................................................................................................1
2.1 EXPLANATION OF THE TYPE NUMBER.................................................................................................................1
2.2 TECHNICAL DESCRIPTION....................................................................................................................................2
3. INSTALLATION .............................................................................................................................................4
3.1 MOUNTING/FASTENING .....................................................................................................................................4
3.2 WIRING................................................................................................................................................................4
4. TRANSPORT/STORAGE .................................................................................................................................5
5. DISMANTLING..............................................................................................................................................6
5.1 ACCESS TO IMPELLER...........................................................................................................................................6
5.2 DISMANTLING SHAFT SEAL..................................................................................................................................7
5.3 DISMANTLING SEAT.............................................................................................................................................7
5.4 DISMANTLING SHAFT WITH BEARINGS ...............................................................................................................7
5.5 INSPECTION.........................................................................................................................................................7
6. ASSEMBLING................................................................................................................................................7
6.1 FITTING SEALING RINGS ......................................................................................................................................7
6.2 FITTING SHAFT WITH BEARINGS..........................................................................................................................7
6.3 FITTING WATER DEFLECTOR................................................................................................................................8
6.4 FITTING SHAFT SEAL ............................................................................................................................................8
6.5 FITTING IMPELLER ...............................................................................................................................................8
6.6 FITTING BEARING HOUSING AND SHAFT SEAL COVER.........................................................................................8
6.7 SHAFT ..................................................................................................................................................................8
6.8 FITTING COUPLING..............................................................................................................................................9
7. FROST PROTECTION ...................................................................................................................................10
8. DISMANTLING............................................................................................................................................10
9. START-UP...................................................................................................................................................10
9.1 STARTING ..........................................................................................................................................................10
10. SYSTEM BALANCING.................................................................................................................................10
11. INSPECTION AND MAINTENANCE .............................................................................................................12
11.1 DRAINING THE PUMP ......................................................................................................................................13
11.2 BEARINGS ........................................................................................................................................................13
12. REPAIRS...................................................................................................................................................16
12.1 ORDERING SPARE PARTS .................................................................................................................................16
13. OPERATING DATA ....................................................................................................................................16
14. EU & UK DECLARATION OF CONFORMITY..................................................................................................18
15. INFORMATION RELEVANT FOR DISASSEMBLY OR DISPOSAL AT END-OF-LIFE..............................................19
16. ASSEMBLY DRAWING AND SPARE PARTS LIST Ø 215/265 ...........................................................................20

__________________________________________________________________________________
DESMI Pumping Technology A/S
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
17. ASSEMBLY DRAWING AND SPARE PARTS LIST 65-265 WITH INDUCER........................................................21
18. ASSEMBLY DRAWING AND SPARE PARTS LIST 100-265 WITH INDUCER ......................................................22
19. ASSEMBLY DRAWING AND SPARE PARTS LIST Ø 330/415/465 ....................................................................23
20. ASSEMBLY DRAWING AND SPARE PARTS LIST 100-330, 100-415 AND 100-465 WITH INDUCER ...................24
21. ASSEMBLY DRAWING AND SPARE PARTS LIST 125-330 WITH INDUCER ......................................................25
22. ASSEMBLY DRAWING AND SPARE PARTS LIST Ø 525 ..................................................................................26
23. ASSEMBLY DRAWING AND SPARE PARTS LIST 300-418 ..............................................................................27
24. ASSEMBLY DRAWING AND SPARE PARTS LIST 350-525 ..............................................................................28
25. ASSEMBLY DRAWING AND SPARE PARTS LIST Ø 330/415/465 WITH INDUCER ............................................29
26. DIMENSIONAL SKETCH. ............................................................................................................................30
APPENDIX A...................................................................................................................................................31

____________________________________________________________________________________
DESMI Pumping Technology A/S 1
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
1. PRODUCT DESCRIPTION
These operation and maintenance instructions apply to the DESMI NSLH and NSLV Spacer pump.
The pump is a single-stage vertical 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 ø330/415/465/525, 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.
ø330/415/465/525: Pumps with ø330, ø415, ø465 or ø525 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 NSLH and NSLV pumps are provided with a name plate. The type number indicated on the name
plate is built up as follows:
NSLHXXX-YYY-MR-Z or NSLVXXX-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 2
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
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M may be the following:
A: Casing and shaft seal cover: Cast iron + cast iron alloy. Impeller and sealing rings: NiAlBz
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: Casing and shaft seal cover: NiAlBz and bronze alloy. Impeller and sealing rings: NiAlBz
S: Casing, shaft seal cover, impeller and sealing rings: SAF2507 and stainless steel alloy.
U: Nonmagnetic material
The pumps can be delivered in other material combinations according to agreement with the supplier.
R may be the following:
02: Monobloc, with bearing in the pump
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
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
r : With inducer
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 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 3
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
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), NiAlBz or stainless steel the
values are to be increased by 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
100-465
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
150-465
1500
1900
1700
2950
1000
650
800
1400
200-265
200-330
200-415
200-525
2000
2520
2260
3920
1330
860
1060
1860
250-330
250-415
250-525
2500
3150
2820
4900
1770
1140
1400
2470
300-415
300-418
300-525
3000
3750
3350
5860
2750
1900
2200
4000
350-525
3500
4370
3920
6840
3630
2500
2930
5300

____________________________________________________________________________________
DESMI Pumping Technology A/S 4
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
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





















Where index "calc" are 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
See also: DESMI Guidelines for pump installations at:
www.desmi.com/media/sd5ltlox/guidelines_uk.pdf
3.1 MOUNTING/FASTENING
The pump should be mounted and fastened ona solid base plate with a flat and horizontal surfaceto avoid
distortion.
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.

____________________________________________________________________________________
DESMI Pumping Technology A/S 5
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
4. TRANSPORT/STORAGE
See also: DESMI Pump Storage and Preservation at: www.desmi.com/media/vqkjqh54/t1534uk.pdf
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
A / D-combination
Pump size
Weight in kg
A / D-combination
65-215
150 / 155
150-415
420 / 455
65-265
195 / 200
150-465
-/498
80-330
295 / 310
150-265
256 / 277
80-215
160 / 170
200-330
432 / 473
80-265
212 / 224
200-415
548 / 592
100-330
317 / 335
200-525
885 / 950
100-415
354 / 366
200-265
323 / 327
100-465
367/ 374
250-330
490 / 537
100-215
165 / 175
250-415
602 / 657
100-265
223 / 238
250-525
930 / 1004
125-330
320 / 345
300-415
690 / 758
125-415
370 / 400
300-418
784 / 713
125-215
165 / 180
300-525
1112/1214
125-265
258 / 281
350-525
1279/-
150-330
365 / 395
The weights of the pumps in E and S (without motor) are equivalent to pumps in A code.
The pump is to be stored in a dry area.
Before shipment the pump is to be fastened securely on pallets or the like.

____________________________________________________________________________________
DESMI Pumping Technology A/S 6
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
The pump is to be lifted in the following way:
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).
ø215/265
Remove Allen screws (77) between coupling part motor (71) and spacer (72) and the screws (76), which
hold the flexible coupling (74) to the coupling part pump (70). It is not necessary to remove the screws
(also 76) which hold the flexible coupling to the spacer. After a vertical pull downwards take out the spacer
(72). Loosen the pointed screw (73) and pull the coupling part pump (70) off the shaft. Dismantle the
copper pipe (58). Remove Allen screws (22) which hold the shaft seal cover (20) to the pump casing.
Remove the shaft seal cover from the pump casing by means of the pointed screws (86). The bearing
housing with shaft and impeller can now be lifted up from the pump as a unit, and the impeller can be
inspected.
ø330/415/465/525
Remove Allen screws (76) at each end of the coupling, and remove the spacer (72). Loosen the pointed
screw (73) and pull the coupling part pump (70) off the shaft. Dismantle the copper pipe (58). Remove set
screws (22) with washers (23) which hold the shaft seal cover to the pump casing. Remove the shaft seal
cover from the pump casing by means of the pointed screws (86) The shaft seal cover and the bearing
housing with shaft and impeller can now be lifted up from the pump as a unit, and the impeller can be
inspected.

____________________________________________________________________________________
DESMI Pumping Technology A/S 7
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
5.2 DISMANTLING SHAFT SEAL
ø215/265
Remove nut (6). Pull off the impeller, and remove sunk key (9). Remove Allen screws (19), which hold the
bearing housing to the shaft seal cover, pull shaft seal cover and bearing housing apart, by which the shaft
seal (10) and water deflector (11) are pulled off the shaft.
ø330/415/465/525
Remove set screw (6). Pull off the impeller, and remove sunk key (9). Remove set screws (19), which hold
the bearing housing to the shaft seal cover, pull shaft seal cover and bearing housing apart, by which the
shaft seal (10) is pulled off the shaft.
5.3 DISMANTLING SEAT
Press out the seat from behind the shaft seal cover.
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 rings/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) in the pump casing (1) is to bear against the shoulder of the pump casing.
ø330/415/465/525
When fitted, the sealing ring (27) in the shaft seal cover (20) is to bear against the shoulder of the shaft
seal cover.
6.2 FITTING SHAFT WITH BEARINGS
Lead shaft with bearings into the bearing housing. Fit sunk key (16).
ø330/415/465/525
Fit cover under bearing (26). For pumps with Lip seal in cover under bearing please read appendix A.

____________________________________________________________________________________
DESMI Pumping Technology A/S 8
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
6.3 FITTING WATER DEFLECTOR
ø215/265
Assemble the bearing housing and the 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.
ø330/415/465/525
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 the bearing housing and the shaft seal cover.
6.4 FITTING SHAFT SEAL
Before fitting the seat, clean the recess in the shaft seal cover. When fitting the seat, remove the protective
coating without scratching the lapped surface. Dip the outer rubber ring of the seat into silicone grease.
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 silicone grease
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 silicone grease 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 at the bottom of the
bearing housing 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 (ø330/415/465/525).
6.6 FITTING BEARING HOUSING AND SHAFT SEAL COVER
Place the O-ring (21) between pump casing and shaft seal cover on the shaft seal cover where it can be
held with a little grease. However, check the material of the O-ring first. As standard the material is nitrile,
but it might beEPDM which will be damaged bymineral grease. Use soft soap orsilicone greasefor EPDM.
Fit and fasten bearing housing and shaft seal cover. Screw the pointed screw (86) back into the shaft seal
cover before tightening. Insert the copper pipe (58).
6.7 SHAFT
When the pump has been assembled, check that the shaft rotates freely.

____________________________________________________________________________________
DESMI Pumping Technology A/S 9
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
6.8 FITTING COUPLING
When the motor and pump is bolted fully together (via the pump Spacer motor bracket) then there are no
further requirements for checking the coupling alignment. But please ensure that suitable shims are used
(where required) below pump and motor feet in order to avoid deformations in pump and/or motor when
tightened down on the foundation / base frame.
ø215/265
Fit the flexible coupling (74) to the spacer (72) by means of the Allen screws (76) which are tightened up
with torque according to the table below. Check that the aluminum insert in the rubber part does not rotate
during tightening as it may damage the coupling. To prevent this, apply a little grease to the bolts under
the bolt head. The Allen screws (76) can be used again and up to 3 times before they are to be replaced
by new originalbolts to secure the locking function. Do not use Loctite as it will damage the rubber element.
Fix the spacer with the flexible coupling to the coupling part motor (71) by means of the Allen screws (77)
and lock nuts (79), also with torque according to the table below. In order to secure the bolt connection fit
a new lock nut or secure with a locking means.
Check that the distance, cf. the table below, between spacer and coupling part pump corresponds to the
actual coupling size which appearsfrom the coupling element itself. Fit the flexible coupling to the coupling
part pump by means of the Allen screws (76) which are to be greased a little under the bolt head and
tightened with the torque stated.
Thread
Torque
Coupling element
Distance
M8
25 Nm
V1700-0832
4 mm
M10
50 Nm
V1700-1042
4 mm
M12
90 Nm
V1700-1242
6 mm
M14
140 Nm
V1700-1442
6 mm
ø330/415/525
Check Allen screws (76) and coupling bushes(74) for damage and clean these with a cloth. Replace them
in case of damage.
Remove greasefrom thescrew threads bymeans of benzene, andclean the threaded holes in thecoupling
halves for pump and motor by means of pressure air. If new coupling halves are mounted, also remove
grease from the threaded holes by means of benzene.
Place coupling bushes (74) in the top holes of the spacer (72), the chamfering on the bushes is to face
downwards. Place the coupling bush in the bottom holes of the spacer, the chamfering on the bushes is
to face upwards. Hold the hand under the spacer and the bottom coupling bushes and carefully push the
spacer into place.
Apply Loctite type 242 on the Allen screws (Loctite 242 is recommended as it will allow dismantling) and
tighten all screws with the hand. It might be necessary to push the spacer a little until the screws have
located in the thread and you feel that the spacer has found the right position.
Tighten the screws with a torque wrench at 55 Nm. As motor/pump shaft will rotate during this operation it
is necessary to hold the spacer by wedging a pin bolt, a piece of flat bar or the like between the two
following screw heads in order to lock the system while the screws are tightened.Fit guard (69).

____________________________________________________________________________________
DESMI Pumping Technology A/S 10
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
7. FROST PROTECTION
Pumps that 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.
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 STARTING
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.

____________________________________________________________________________________
DESMI Pumping Technology A/S 11
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
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 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: [email protected]
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

____________________________________________________________________________________
DESMI Pumping Technology A/S 13
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
Recommended inspection and maintenance intervals for normal applications:
(half intervals are recommended for a new application –until required intervals can be determined for actual application)
(if daily inspection is not done remote monitoring of pump is recommended –e.g. via temperature sensors on pump bearings)
Inspect (I) or Maintain (M) at the
indicated calendar time or run time
interval –whichever comes first
Daily
Weekly
Monthly
8000 running
hours or
12 months
25000 running
hours or
60 months
Shaft seal leakage (normally less
than 0.5 mL/hour (~10 drops/hour) –
if more than 5 mL/hour shaft seal
replacement is recommended
I
Motor ampere and/or power
consumption within normal range
I
Unusual noise
I
Unusual vibration (normally less
than 2.8 mm/s from pump itself –
and less than 7 mm/s incl. external
excited vibrations)
I
Pressure gauge readings to be
within normal range (i.e. keep flow
within 70 to 120% of BEP flow if
allowed by NPSHa <> NPSHr –see
note below)
I
Unusual bearing temperatures
(normally less than 85°C)
I
Check (clean if required) drain hole
for shaft seal
I(M)
Pumps not running: Rotate pump
shaft 2 to 3 revolutions or start
shortly (if pump is filled with liquid)
M
Regrease pump and/or motor
bearings
Refer to section 11.2 and motor manual (if motor bearings are re-greaseable)
Spacer coupling elastomer(s)
I
Replace mechanical shaft seal and
V-ring
M
Replace pump bearings
M
Replace Spacer coupling
elastomer(s)
M
Note: Operation outside 70 to 120% of BEP flow reduce the pump life (incl. shaft seal and pump bearings) significantly.
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 BEARINGS
ø215/265
The bearings are dimensioned for a nominal (i.e. only obtainable for ideal greasing and operating
conditions) life of 25,000 working hours and are to be relubricated according to the below table.
Light bearing housing (combination 13):
The bearings are lubricated for life and require no attention but are to be replaced in case of noise or
bearing wear. In connection with replacement, the lower bearing is to be mounted with an 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.
Heavy bearing housing (combination 14):

____________________________________________________________________________________
DESMI Pumping Technology A/S 14
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
Only the upper bearing (15) is lubricated for life, whereas the lower is to be relubricated through the
lubricator nipple (84) in accordance with the table below. The replacement of bearings to be made under
the same conditions and according to the same procedure as for combination 13, however, the RS -
sealing is not to be considered.
ø330/415/465/525
The bearings are dimensioned for a nominal (i.e. only obtainable for ideal greasing and operating
conditions) life of 100,000 working hours and are to be relubricated according to the below table.
Light bearing housing (combination 13):
The bearings are relubricated through the lubricator nipples (84) at top and bottom of the bearing housing
(18). 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.
Heavy bearing housing (combination 14):
Both bearings are relubricated through lubricator nipples (84) at top and bottom of the bearing housing
(18). See instructions for ø215/265. The top bearing (15) is 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 15
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
Pump size
Assembly
Interva
(running hours)l
Quantity
Bottom
bearing (13)
Quantity
Top bearing
(15)
ø215/265
Light bearing
housing
Lubricated for life
40 g
Lubricated for
life
ø215/265
Heavy bearing
housing
8000 hours
65 g
Lubricated for
life
80-330
100-330
125-330
100-415
125-415
100-465
Light bearing
housing
4500 hours
30 g
15 g
150-330
200-330
250-330
150-415
150-465
Heavy bearing
housing
4500 hours
40 g
20 g
200-415
250-415
300-415
300-418
Heavy bearing
housing
4500 hours
50 g
25 g
200-525
250-525
300-525
350-525
Heavy bearing
housing
4500 hours
80 g
35 g
If the pump liquid temperature is below 80 ℃the following types of grease are recommended:
ESSO
Beacon 2
BP
Energrease LS EP 2
Shell
Gadus S5 V100 2
Mobil
Mobil lux grease EP 2
Castrol
Spheerol AP 2
Texaco
Multifak EP 2
Q8
Rembrandt EP 2 eller Rubens
Statoil
UniWay Li 62

____________________________________________________________________________________
DESMI Pumping Technology A/S 16
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
If the pump liquid temperature is above 80 ℃, high-temperature grease is recommended, e.g. SKF
LGHP2.
DESMI use SKF LGHP2 as standard.
Vibration levels higher than 7 mm/s at pump bearing are considered damaging and will normally result in
significantly shorter grease and/or bearing life –especially for pumps not running. Hence shorter re-
greasing intervals might be required for pumps installed where external excited vibration levels can be
higher than 7 mm/s.
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.
13. OPERATING DATA
The following working pressures (pressure in piping incl. the pressure increase caused by the pump) and
number of revolutions are allowed in standard pumps.
Pump size
Max.
working
pressure
[bar]
Bronze /
Cast iron
Max.
working
pressure
[bar]
SG-iron
Max. RPM
Light/heavy
bearing
housing
Pump size
Max.
working
pressure
[bar]
Bronze /
Cast iron
Max.
working
pressure
[bar]
SG-iron
Max. RPM
65-215
16
25
1800/3600
150-415
9 / 13
25
1800
65-265
14.5
25
1800/3600
150-465
9
-
1800
80-330
15
25
3600/---
150-265
10
25
1800
80-215
13
25
1800/3600
200-525
14
25
1800
80-265
14.5
25
1800/3600
200-330
7 / 13
25
1800
100-330
11 / 14
25
3000/3600
200-415
9 / 13
25
1800
100-415
10 / 12.5
25
1800/---
200-265
10 / 12.5
25
1800
100-465
8
25
1800
250-330
7 / 12
25
1800
100-215
12.5
25
1800/3600
250-415
9 / 12
25
1800
100-265
14.5
25
1800/3600
250-525
14
25
1800
125-330
11 / 12
25
1800
300-415
9 / 12
25
1800
125-415
9 / 13
25
1800
300-418
6/16
25
1600
125-215
8
25
1800
300-525
14
25
1800
125-265
7
25
1800
350-525
-/16
25
1600
150-330
7 / 13
25
1800
Notice: Some pump combinations allow higher speeds than stated in the table–see actual pump name plate.

____________________________________________________________________________________
DESMI Pumping Technology A/S 17
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
www.desmi.com
The max. working pressure for NiAlBz and stainless steel pumps is 1.5 times max. working pressure for
bronze (RG5).
The above-mentioned max. working pressure is a design value –delivered pumps are pressure tested
according to actual application requirements and actual flange standards.
For instance 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.