Desmi ESLHT/-17 W180 Troubleshooting guide

OPERATION AND MAINTENANCE INSTRUCTIONS
DESMI end suction centrifugal pump
ESLHT/-17 W180
DESMI Pumping Technology A/S
Tagholm l, DK-9400 Nørresundby, Denmark
Tel.:
[phone]
Fax:
[phone]
E-mail:
[email protected]
Internet:
www.desmi.com
Manual:
T1539
Language:
English
Revision:
B(01/2022)
Special pump No. ...............................................

_______________________________________________________________________________
DESMI Pumping Technology A/S 2
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
Table of Contents
1. PRODUCT DESCRIPTION ...............................................................................................................................3
1.1 DELIVERY ......................................................................................................................................................3
2. TECHNICAL DATA .........................................................................................................................................3
2.1 EXPLANATION OF THE TYPE NUMBER ..........................................................................................................3
2.2 TECHNICAL DESCRIPTION.............................................................................................................................4
3. INSTALLATION..............................................................................................................................................5
3.1 MOUNTING/FASTENING ..............................................................................................................................5
3.2 WIRING.........................................................................................................................................................5
4. TRANSPORT/STORAGE.................................................................................................................................5
5. DISMANTLING..............................................................................................................................................6
5.1 DISMANTLING OF ESLHT25-180N/A-17 W180 /ESLHT40-180N/A-17 W180...............................................6
5.1.1 DISMANTLING COUPLING.........................................................................................................................6
5.1.2 DISMANTLING REAR COVER AND IMPELLER..............................................................................................7
5.1.3 DISMANTLING SHAFT SEAL &BEARING .....................................................................................................8
5.3 INSPECTION..................................................................................................................................................9
6. ASSEMBLING..............................................................................................................................................11
6.1 FITTING CARBON BEARING AND VORTEX BREAKER....................................................................................11
6.2 FITTING SHAFT WITH BEARINGS.................................................................................................................11
6.3 FITTING SHAFT SEAL ...................................................................................................................................11
6.4 FITTING BEARING HOUSE ...........................................................................................................................12
6.5 FITTING IMPELLER ......................................................................................................................................12
6.6 FITTING REAR COVER ...................................................................................................................................12
6.7 FITTING COUPLING AND MOTOR ...............................................................................................................12
6.8 SHAFT .........................................................................................................................................................13
7. FROST PROTECTION ...................................................................................................................................13
8. DISMANTLING............................................................................................................................................13
9. START-UP...................................................................................................................................................13
9.1 START-UP ...................................................................................................................................................13
10. SYSTEM BALANCING ................................................................................................................................14
11. INSPECTION AND MAINTENANCE.............................................................................................................15
11.1 DRAINING THE PUMP ...............................................................................................................................15
12. REPAIRS ...................................................................................................................................................15
12.1 ORDERING SPARE PARTS ..........................................................................................................................15
12.2 REPLACING THE IMPELLER........................................................................................................................15
12.3 REPLACING O-RINGS.................................................................................................................................15
12.4 REPLACING SHAFT SEAL (22) ....................................................................................................................15
12.5 REPLACING BALL BEARINGS .....................................................................................................................16
13. OPERATING DATA ....................................................................................................................................17
14. EU DECLARATION OF CONFORMITY .........................................................................................................18
15. INFORMATION RELEVANT FOR DISASSEMBLY OR DISPOSAL AT END-OF-LIFE ..........................................19
16. ASSEMBLY DRAWING ESLHT25-180N/-17 W180.......................................................................................19
17. DIMENSIONAL SKETCH.............................................................................................................................20

_______________________________________________________________________________
DESMI Pumping Technology A/S 3
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
1. PRODUCT DESCRIPTION
These operation and maintenance instructions apply to the DESMI ESLHT pump in /-17
execution.
The ESLHT pump is designed for horizontal assembly with the pressure flange pointing
upwards. The pump is a single-stage end suction centrifugal pump equipped with stainless
steel shaft, balanced mechanical shaft seal mounted in a separate chamber with cooling ribs
and fan cooling and closed impeller. Between impeller and shaft sealing, a carbon bearing is
built in that is flushed from the pressure side of the pump.
The pump can be used as standard for water with temperatures up to 180°C –possibly higher
temperatures in agreement with DESMI. Higher temperaturesmay be permitted if, for example,
any working pressure allowed in the pump housing at the current temperature, pumped liquid,
maximum suction pressure, pump size, speed, current shaft seal and maximum ambient
temperature make it possible. Max. operating pressure and speed ranges are specified in
operational data.
If the pump is to be used for liquids other than water, other rubber types are likely to be used
for O-rings and any other materials for the other liquid-affected parts of the pump - contact
DESMI accordingly.
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 are specified in the type
number on the name plate. See below.
2.1 EXPLANATION OF THE TYPE NUMBER
The pump are provided with a name plate. The type number indicated on the name plate is
built up as follows:
ESLHTXXX-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
M may be the following:
A: Casing and shaft seal cover : SG iron ( GGG40 as standard). Impeller: SS
S: Casing : SS.: Impeller: SS
R may be the following:
17 W180 : Special design for 180°C
Z may be the following:

_______________________________________________________________________________
DESMI Pumping Technology A/S 4
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
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.
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.
The permissible loads on the flanges appear from the following table. The values apply to
standard pumps in SG iron (GGG40).
DN
mm
Forces (N)
Torques (Nm)
FY
Fz
FX
F
My
Mz
Mx
M
25
40
50
250
400
500
320
500
600
250
400
550
480
750
1000
300
400
450
150
200
250
260
300
350
420
550
600
In connection with the permissible loads on the flanges the following is to be observed:
2
2
.
2
.



















+


epermissiblMax
M
calculated
M
epermissiblMax
F
calculated
F
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

_______________________________________________________________________________
DESMI Pumping Technology A/S 5
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
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.
When installing the pump check that it is earthed to avoid an electrical potential in the pump.
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 totouch the pump surfaceand, consequently, hemust 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 standard combination (without motor) are stated in the following
table, and the pumps are to be lifted as shown below.
Pump
Weight in kg
without motor & base plate
ESLHT 25-180N
40
ESLHT 40-180N
43
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 in the following way:

_______________________________________________________________________________
DESMI Pumping Technology A/S 6
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
The lifting straps must not bear against sharp edges and corners.
5. 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.
5.1DISMANTLING OF ESLHT25-180N/A-17 W180 /ESLHT40-180N/A-17 W180
5.1.1 DISMANTLING COUPLING
Dismantle the stainless steel pipe (30) then
remove the coupling guard (39)
Unscrew the nut & washer (43 & 44 ) and
remove the motor
Unscrew the coupling point screw and
remove the coupling (38) with the cooling
30
39
43，44
38
47

_______________________________________________________________________________
DESMI Pumping Technology A/S 7
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
fan (47)
5.1.2 DISMANTLING REAR COVER AND IMPELLER
Unscrews the set screws (37)
Unscrew the nut & washer (22, 51 & 52 )
Remove rear cover unit.
Remove the cap nut (24) & washer (23)
37
51 & 52
22
24
23

_______________________________________________________________________________
DESMI Pumping Technology A/S 8
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
Remove the impeller (5) and O-ring (3)
5.1.3 DISMANTLING SHAFT SEAL & BEARING
Remove the impeller key (19)
Unscrew nut & washer (16,18 & 50 )
Lift the bearing with bearing housing
Unscrew the mechanical point screw and
remove the mechanical seal (10) and O-ring
(27)
5
3
19
10
27
32
35

_______________________________________________________________________________
DESMI Pumping Technology A/S 9
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
Unscrew set screws (35 & 36) and
remove the grease nipple (32)
Remove the key (34)
Remove the bearing cover (20)
Take out the shaft with ball bearing
Take out the oil seal ring (11)
Remove the SNAP ring (12) and take out the
ball bearing (13), grease valve ring (14) and
orifice ring (31)
Unscrew the counter sunk allen screws
(48) the carbon bearing (4)
5.3 INSPECTION
When the pump has been dismantled, check the following parts for wear and damage:
36
34
20
11
13
31
14
12
48
4

_______________________________________________________________________________
DESMI Pumping Technology A/S 10
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
- Pump casing/impeller: Max. clearance 0.3-0.6 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.
- Sliding bearing/shaft : Wear= max. 0.5 mm diameter difference.

_______________________________________________________________________________
DESMI Pumping Technology A/S 11
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
6. ASSEMBLING
Referring to the reverse process of dismantling.
6.1 FITTING CARBON BEARING AND VORTEX BREAKER
Fit the carbon bearing (4) and vortex breaker (8) into the rear cover (7) then tighten the
counter sunk Allen screws(9 & 48).
6.2 FITTING SHAFT WITH BEARINGS
Before fitting the oil sealing ring (11), clean the recess in the bearing house (15), then lead
the shaft with ball bearing into bearing housing and fit the bearing cover (20).
6.3FITTING SHAFT SEAL
Before fitting the seat, clean the recess in the bearing house. When fitting the seat, remove
the protective coating 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 surface of the slide ring rubber
bellows with soapy water and push it over the shaft. The use of a conical 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.
It has to be made sure the length from ELK shaft seal end to bearing house flange being
within 44 +/- 0.5mm of the nominal length as shown below.
Notice ! Never use mineral oil / fat as grease, as rubber parts as standard are in EPDM.
Notice ! Never put grease on the sliding surfaces! They must be completely dry, dust-free
and clean during the mounting procedure. Also any fingerprints shall be removed with
alcohol or another suitable solvent.
ELK shaft seals must be turned after installation ... so O-rings, springs and sliding surfaces
can slip into right placement before pressure testing. This is done by mounting the seal as
described and later turn the shaft about 10 revolutions - with water in the pump - but without
adding pressure. Then pressure test the pump as normally done.

_______________________________________________________________________________
DESMI Pumping Technology A/S 12
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
When using soapy water on the shaft, the bellows will settle and seat in abt. 15 minutes, and
until then tightness should not be expected. After start, check by viewing the leak hole that
there are no leaks.
6.4 FITTING BEARING HOUSE
Place the O-ring (27) between rear cover (7) and bearing house (15) in the O-ring groove
and hold it with a little soft soap or silicone grease. Please check the material of the O-ring
first. As standard the material is EPDM, which will be damaged by mineral grease. Fit and
fasten bearing house in the rear cover.
6.5FITTING IMPELLER
Fit the sunk key in the shaft and lead the impeller towards the shoulder of the shaft. Secure
the impeller (5) with washers (23) and Domed cap nut (24) .
6.6FITTING REAR COVER
Place the O-ring (3) between pump casing and rear cover (7) 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 VITON, Fit and fasten rear cover in the pump casing.
6.7FITTING COUPLING AND MOTOR
Fit the cooling fan (47) to the pump half coupling (38) with sunk screws (49). Then fit
the pump half coupling to pump shaft and tighten the pointed screw. Fit the motor
half coupling to motor shaft and tighten the pointed screw, place pump and motor on
baseplate (45) and tighten the set screw with washers (41, 42, 43,44) slightly. Add
shims under bearing support (33) and motor feet, adjust the number of shims to
ensure the coupling is at the right axial position. Measured the coupling within the
limits indicated in the below table. And tighten the set screw (37) after the coupling is
in right position .

_______________________________________________________________________________
DESMI Pumping Technology A/S 13
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
6.8SHAFT
When the pump has been assembled, check that the shaft rotates freely.
7. FROST PROTECTION
Pumps which are not in operation during frost periods are to be drained to avoid frost
damage. Remove the plug at the bottom to empty the pump. Alternatively, it is possible to
use anti-freeze liquids in normal constructions.
8. DISMANTLING
When removing the pump, first make sure that the pump has stopped. The
pump is then drained of liquid before being dismantled from the piping system. If the pump
has pumped dangerous liquids, be aware of this and protect against damage. In the case of
hot liquids, care should be taken to ensure that the pump is emptied before removing the
piping system.
9. START-UP
Please make sure the pump is filled with cold , clean water(room temperature) before
first start-up and/or after pump has been drained.
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 180°C). 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.
Pumping water through a passive continuous pump is not recommended as it may damage
the shaft seal due to lack of ventilation and/or too low speed due to current pressure and
temperature at the shaft seal.
Check in the electric motor manual if the bearings in the actual motor shall be lubricated with
grease before first start-up.
9.1 START-UP
Before starting the pump check that:
- the shaft rotates freely without jarring sounds.
- the pump casing, mechanical seal chamber 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.
For the life of the shaft sealing, it is recommended that the pumps run at a speed of at least
450 rpm and that a maximum of 1 minute is spent on acceleration from 0 to 450 rpm and 1
minute deceleration from 450 to 0 rpm.

_______________________________________________________________________________
DESMI Pumping Technology A/S 14
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
In order to protect the shaft seal the pump must never run dry.
When the pump has been filled with cold and clean water(room temperature), the system
can be started. Check the direction of rotation. If the direction is incorrect interchange of the
power cords. The direction of rotation is indicated by an arrow. Make sure the bearings are
running correctly and that they do not become warm.
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
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
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 15
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
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.
On pumps inoperative, the shaft must be rotated at least 2-3 rounds monthly to avoid
standstill damage to shaft seal and bearings. If the pump is liquid-filled, it can alternatively be
started up briefly.
In special applications, more frequent rotation or short-term start-up may be necessary to
avoid solidification of the impeller and/or shaft seal.
In pressurized systems, the shaft seal is often seen to leak slightly during standstill –in most
cases the leak stops shortly after the pump is started up.
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 (2) at the bottom of the pump and shaft seal chamber.
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.
The following parts are exposed to wear: Shaft seal (10), impeller (5), carbon bearing (4), O-
rings (3 and 27), oil seal ring (11) and the ball bearing (13).
12.2 REPLACING THE IMPELLER
Close the valves on both sides of the pump. Draining the pump by dismantling pipe plug (2)
at the bottom of the pump and shaft seal chamber. And dismantle the motor, Loosen the nuts
(22) , set screws (37) and dismantle the rear cover with rotating parts from the pump casing.
Remove the camp cap nut (24) and take off the impeller (5). Fit the new impeller.
12.3 REPLACING O-RINGS
When impeller and shaft have been separated, Remove the key (19) and loosen the nuts (18)
and dismantle the bearing house with shaft and ball bearing unit from the rear cover. The O-
ring (3 and 21) in the rear cover (7) and bearing house can be pulled out.
In order to replace the O-ring (21) it is necessary first to dismantle the impeller.
12.4 REPLACING SHAFT SEAL (22)
Dismantling as described in paragraph 5.
When the impeller has been dismantled, Remove the key (19) and loosen the nuts (18) and
dismantle the bearing house with shaft and ball bearing unit from the rear cover. Loosen the
point screw, then the sealing element itself can now be pulled off the shaft.

_______________________________________________________________________________
DESMI Pumping Technology A/S 16
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
Dismantle the top piece from the ball bearing to permit pressing from the back with a pair of
screwdrivers or the like under the collar off the seat.
Clean the bore for seat and shaft thoroughly of dirt and rust. Remove persistent coatings, if
any, by grinding the shaft lightly with very fine emery cloth.
Grease the new seat ring and the inserted O-ring well with glycerine –not oil –and press it
into place in the casing. Check that the seat is fitted correctly by knocking lightly with a piece
of wood. The seat ring is to be treated very carefully to prevent the sliding surface from being
scratched.
It is necessary to use a conical bush as shown below to prevent the rubber bellows from being
damaged during mounting.
Grease the back of the carbon ring with glycerine to ensure that it stays in its correct place
during the mounting. Grease the shaft, the conical bush and the rubber bellows amply with
glycerine.
And If it is necessary to use plastic tape to help shaft seal get through the slide bearing
rough surface area on the shaft.
Press the shaft seal on to the shaft until it resists. Press the driving ring only,
Finally It has to be made sure the length from shaft seal end to bearing house flange being
within 44 +/- 0.5mm of the nominal length. And lock it with the pointed screw.
The ELK shaft seals must be turned after installation ... so O-rings, springs and sliding
surfaces can slip into right placement before pressure testing. This is done by mounting the
seal as described and later turn the shaft about 10 revolutions - with water in the pump - but
without adding pressure. Then pressure test the pump as normally done.
12.5 REPLACING BALL BEARINGS
The bearings are dimensioned for a nominal life of 100,000 operating hours and is to be
relubricated according to the following table. Bearings must be replaced in case of noise or
bearing wear.
The bearingsmust be re-lubricated throughthe lubrication nipples (32)mounted onthe outside
of the bearing house console (15) according to the table below. When replaced, fill the
bearings with grease and place a fat tumour on top of the shaft in a quantity corresponding to
the chart below. The high-temperature grease SKF LGHP2 is recommended.
Pump
Assembly
Interval
Quantity
ESLHT25-180N
Ball bearing housing
4500 hours
10 g
ESLHT40-180N
Ball bearing housing
4900 hours
10 g
If the ball bearing is to be replaced, it is necessary to disassemble the pump and dismantle
the pump shaft (as described in paragraph 5.1.3):

_______________________________________________________________________________
DESMI Pumping Technology A/S 17
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
When assembling the pump again, check the pump shaft for damages in the form of marks,
burrs, or upsetting of the shaft end.
Damages, if any, are to be remedied by means of a file and fine emery cloth. This work has to
be done very carefully. If this is not done carefully, the pump shaft will scratch the shaft seal
when fitted.
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
Max.
working pressure[bar]
SG-iron
Max.
working pressure[bar]
SS
Max.RPM
ESLHT25-180
14
16
3600
ESLHT40-180
14
16
3600
The above max. operating pressure is valid at 180°C water
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.

_______________________________________________________________________________
DESMI Pumping Technology A/S 18
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
14. EU DECLARATION OF CONFORMITY
DESMI Pumping Technology A/S, hereby declare that our pumps of the ESLV and ESLH and
ESLHT 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 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)
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, March 05 2019
Henrik Mørkholt Sørensen
Managing Director
DESMI Pumping Technology A/S
Tagholm 1
9400 Nørresundby

_______________________________________________________________________________
DESMI Pumping Technology A/S 19
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
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.
16. ASSEMBLY DRAWING ESLHT25-180N/-17 W180 /ESLHT40-180N/-17 W180

_______________________________________________________________________________
DESMI Pumping Technology A/S 20
www.desmi.com
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected]
1
Pump casing
15
Bearing house
29
Hexagon nipple
49
Sunk screw
2
Pipe Plug
16
Washer
30
Tube
50
Spring washer
3
O-ring
17
Stud
31
Orifice ring
51
Washer
4
Bearing
18
Nut
32
Grease nipple
52
Spring washer
5
Impeller
19
Key
33
Bearing support
53
Tee
6
Shaft
20
Bearing cover
34
Key
54
Hexagon nipple
7
Rear cover
21
Stud
35
Set screw
55
Pipe Plug
8
Vortex Break
22
Nut
36
Set screw
9
Sunk screw
23
Washer
37
Set screw
10
Mechanical seal
24
Cap nut
38
Coupling
11
Oil seal ring
25
Washer
39
Coupling guard
12
Snap ring
26
Bush
45
Baseplate
13
Ball bearing
27
O-ring
47
Cooling fan
14
Support disc
28
Air vent
48
Sunk screw
17.DIMENSIONAL SKETCH
Please require a dimensional sketch of the actual pump from DESMI.
Connection holes on pump: Manometer: 1/4” BSP. Drain: 1/4” BSP.