Desmi DSL 300-320 Manual

OPERATION AND MAINTENANCE INSTRUCTION
DESMI “in-line” centrifugal pump
Type DSL
DESMI Pumping Technology A/S
Tagholm 1 –DK-9400 Nørresundby –Denmark
Tel.:
[phone]
Fax:
[phone]
E-mail:
[email protected]
Internet:
www.desmi.com
Manual:
T1343
Language:
English
Revision:
Q (12/19)
Special pump No. .................................................

Contents
1. PRODUCT DESCRIPTION................................................................................................................................... 4
1.1 DELIVERY ............................................................................................................................................................... 4
2. TECHNICAL DATA ............................................................................................................................................... 4
2.1 ACCESSORIES ...................................................................................................................................................... 4
2.2 SPACE AROUND THE PUMP.............................................................................................................................. 4
2.3 EXPLANATION OF THE TYPE NUMBER........................................................................................................... 5
2.4 TECHNICAL DESCRIPTION ................................................................................................................................ 6
3. INSTALLATION..................................................................................................................................................... 7
3.1 MOUNTING/FASTENING...................................................................................................................................... 7
3.2WIRING.................................................................................................................................................................... 8
4. TRANSPORT/STORAGE ..................................................................................................................................... 8
5. DISMANTLING....................................................................................................................................................... 8
5.1 DISMANTLING MOTOR AND BRACKET........................................................................................................... 8
5.2 DISMANTLING COUPLING ................................................................................................................................. 8
5.3 DISMANTLING TOP BEARING AND SHAFT SEAL......................................................................................... 8
5.4 DISMANTLING BOTTOM BEARING .................................................................................................................. 9
5.5 DISMANTLING BOTTOM SHAFT SEAL............................................................................................................. 9
5.6 DISMANTLING REAR COVER WITH SHAFT AND IMPELLER...................................................................... 9
6. ASSEMBLING.......................................................................................................................................................10
6.1 FITTING SEALING RING AND IMPELLER....................................................................................................... 10
6.2 FITTING TOP BEARING AND SHAFT SEAL.................................................................................................... 10
6.3 FITTING REAR COVER WITH SHAFT AND IMPELLER................................................................................ 10
6.4 FITTING BOTTOM SHAFT SEAL....................................................................................................................... 10
6.5 FITTING BOTTOM BEARING............................................................................................................................. 11
6.6 FITTING COUPLING............................................................................................................................................ 11
6.7 COUPLING GUARD............................................................................................................................................. 12
7. FROST PROTECTION.........................................................................................................................................12
8. DISMANTLING......................................................................................................................................................12
9. START-UP.............................................................................................................................................................12
9.1 STARTING............................................................................................................................................................. 13
10. SYSTEM BALANCING ......................................................................................................................................13
10.1 FAULT-FINDING CHART.................................................................................................................................. 14
11. INSPECTION AND MAINTENANCE ................................................................................................................16
11.1 INSPECTION DURING OPERATION.............................................................................................................. 16
11.2 DRAINING THE PUMP...................................................................................................................................... 16
11.3 INSPECTION ...................................................................................................................................................... 16
11.4 LUBRICATING BEARINGS............................................................................................................................... 16
12. REPAIRS.............................................................................................................................................................18
12.1 ORDERING SPARE PARTS............................................................................................................................. 18
13. OPERATING DATA............................................................................................................................................19
14. EU DECLARATION OF CONFORMITY...........................................................................................................20

15. INFORMATION RELEVANT FOR DISASSEMBLY OR DISPOSAL AT END-OF-LIFE..............................21
16. ASSEMBLY DRAWING.....................................................................................................................................22
16.1 DSL300 SPACER DESIGNWITH BOTTOM ROLLER BEARING............................................................... 22
16.2 DSL300 COMPACT DESIGN WITH BOTTOM ROLLER BEARING........................................................... 24
16.3 DSL300 SPACER DESIGNWITH BOTTOM SLIDING BEARING............................................................... 26
16.4 DSL300 COMPACT DESIGN WITH BOTTOM SLIDING BEARING........................................................... 28
16.5 DSL400 SPACER DESIGNWITH BOTTOM ROLLER BEARING............................................................... 30
16.6 DSL400 COMPACT DESIGN WITH BOTTOM ROLLER BEARING........................................................... 32
16.7 DSL400 SPACER DESIGNWITH BOTTOM SLIDING BEARING............................................................... 34
16.8 DSL400 COMPACT DESIGN WITH BOTTOM SLIDING BEARING........................................................... 36
17. DIMENSIONAL SKETCH (DESIGN BEFORE 2006)......................................................................................38
18. DIMENSIONAL SKETCH (DESIGN AFTER 2006) .........................................................................................38

______________________________________________________________________________
DESMI Pumping Technology A/S 4
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 DSL-pump series, in spacer and
compact design. The pumps are available in sizes ranging from 300 mm to 400 mm on the pressure
flange. The suction flange is bigger than the pressure flange.
The DESMI DSL-pump isa 1-stage centrifugal pump with stainless steelshaft, mechanical shaft seals
and closed impeller of the double-suction type.
The pump is a so-called "in-line" type, i.e. suction and pressure branches are mounted on the centre
line. It is vertical with impeller of the double-suction type with double-curved blades, and it has a
helical pump casing in one casting.
The pump is driven by an electric motor which may be a standard AC motor or a DC motor.
1.1 DELIVERY
-Check on delivery that the shipment is complete and undamaged.
-Defects and damages, if any, to be reported to the carrier or 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 paragraph 2.3.
2.1 ACCESSORIES
As extra equipment the pump may be mounted with a priming pump of the water ring type, complete
with filter and feed water tank, or it may be delivered with an ejector pump.
Manometers are standard equipment.
2.2 SPACE AROUND THE PUMP
On the spacer pump it is possible to dismantle the impeller and the shaft without dismantling the
electric motor. Therefore, no minimum distance is required above the electric motor. The ventilation
of the motor should, however, be taken into consideration.
On the compact pump the motor and the motor bracket must be removed before dismantling shaft
and impeller. This means that there is to be so much space above the motor that motor with bracket
can be lifted abt. 250 mm up.
Generally, there is to be sufficient space in front of the pump to allow inspection of the shaft seal for
leaks and dismantling of the coupling and the internal parts of the pump. It must also be possible to
dismantle the entire pump, if required.
If the pump is equipped with a slide bearing at the bottom, there is to be a distance of abt. 100 mm
under the middle of the pump measured from the pump feet for dismantling of the slide bearing. In
the standard pump type, i.e. roller bearing and shaft seal at the bottom, this is not

______________________________________________________________________________
DESMI Pumping Technology A/S 5
Tagholm 1
9400 Nørresundby –Denmark
Tel: [phone] Fax: [phone]
E-mail: [email protected] www.desmi.com
necessary, but nevertheless it would be an advantage to provide space under the pump, as it would
facilitate the servicing of the bottom bearing of the pump and the shaft seal considerably.
2.3 EXPLANATION OF THE TYPE NUMBER
All the DSL-pumps are provided with a name plate. The type number indicated on the name plate is
built up as follows:
DSL-XXX-YYY/M-R
XXX : Diameter DN (mm) of the pressure branch (300, 400)
YYY : Diameter (mm) of standard impeller (320, 465, 495).
M : The material combination of the pump.
R : The assembly combination of the pump.
R may be the following:
a : Spacer design. l : Other shaft seal.
b : Spacer design without bottom bearing. m : BS-flanges.
f : Compact design. n : ANSI-flanges.
g : Compact design without bottom bearing. o : Shock-proof combination.
i : With PN 16 flanges. p : Other combination.
j : With PN 25 flanges. q : JIS-flanges.
k : Identical suction and pressure
Flanges.
M may be the following:
Material
combination
A
C
D
Q
Pump casing
Cast iron
Cast iron
Bronze
See note 1)
Impeller
Alu-bronze
Cast iron
Alu-bronze
See note 1)
Sealing ring
Alu-bronze
Cast iron
Alu-bronze
See note 1)
Rear cover
Cast iron
Cast iron
Bronze
See note 1)
Shaft
Stainless steel
Stainless steel
Stainless steel
Stainless steel
Shaft seal
Mechanical
Mechanical
Mechanical
Mechanical
Elastomer
Nitrile
Nitrile
Nitrile
Nitrile
Note 1): The pumps are available in other material combinations at request.
Before putting a pump into operation, the suitability of the material combination of the pump must
always be taken into consideration. In case of doubt, contact the supplier.
The pump is suitable for the pumping of liquids with temperatures up to 80°C. With special shaft seal