Desmi SA50-T HATZ 1B20 Troubleshooting guide

OPERATION AND MAINTENANCE INSTRUCTIONS
DESMI portable centrifugal pump
SA50-T (50-135/14) HATZ 1B20/30
DESMI PUMPING TECHNOLOGY A/S
Tagholm 1 –DK-9400 Nørresundby –Denmark
Tel.:
[phone]
Fax:
[phone]
E-mail:
[email protected]
Internet:
www.desmi.com
Manual:
T1411
Language:
English
Revision:
F (11/19)
Special pump No.:……………………..

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 1
Contents
1. GENERAL INFORMATION ........................................................................................................................................ 2
1.1 PRODUCT DESCRIPTION ........................................................................................................................................... 2
1.2 NAME PLATE............................................................................................................................................................. 2
1.2.1 TYPE DESCRIPTION ........................................................................................................................................... 3
1.3 EU DECLARATION OF CONFORMITY ......................................................................................................................... 4
1.4. INFORMATION RELEVANT FOR DISASSEMBLY OR DISPOSAL AT END-OF-LIFE.........................................................5
2. WARNINGS ............................................................................................................................................................. 5
3. OPERATION ............................................................................................................................................................ 5
3.1. START-UP............................................................................................................................................................. 5
3.1.1 STARTING ......................................................................................................................................................... 5
3.2 SYSTEM BALANCING.................................................................................................................................................6
3.3.1 DRAINING THE PUMP ....................................................................................................................................... 8
3.4. FROST PROTECTION.................................................................................................................................................8
3.5 NOISE LEVEL ............................................................................................................................................................. 8
4. ASSEMBLING - REPAIR - DISMANTLING................................................................................................................... 8
4.1 FROM DELIVERY TO ASSEMBLING ............................................................................................................................ 8
4.1.1 DELIVERY .......................................................................................................................................................... 8
4.1.2 TRANSPORT / STORAGE.................................................................................................................................... 8
4.1.3 ASSEMBLING PUMP.......................................................................................................................................... 9
4.1.4 INSTALLATION .................................................................................................................................................. 9
4.2 DISMANTLING PUMP................................................................................................................................................9
4.2.1 INSPECTION ...................................................................................................................................................... 9
4.3 ASSEMBLING PARTS IN THE PUMP ........................................................................................................................... 9
4.3.1 FITTING INTERMEDIATE PIECE.......................................................................................................................... 9
4.3.2 FITTING SHAFT.................................................................................................................................................. 9
4.3.3 FITTING SHAFT SEAL ......................................................................................................................................... 9
4.3.4 FITTING IMPELLER .......................................................................................................................................... 10
4.4 REPAIR.................................................................................................................................................................... 10
4.4.1 ORDERING SPARE PARTS ................................................................................................................................ 10
4.5 DISMANTLING ........................................................................................................................................................ 10
5. TECHNICAL SPECIFICATION ....................................................................................................................................11
5.1 PUMP...................................................................................................................................................................... 11
5.1 1 WEIGHT OF PUMP .......................................................................................................................................... 11
5.2 ENGINE ................................................................................................................................................................... 11
5.2.1 ENGINE IN GENERAL....................................................................................................................................... 11
5.3 OPERATING DATA................................................................................................................................................... 11
5.4 ASSEMBLY DRAWING –TYPICAL ............................................................................................................................ 12
5.4.1 SPARE PARTS LIST - TYPICAL ........................................................................................................................... 13
5.5 DIMENSIONAL SKETCH –TYPICAL........................................................................................................................... 14

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 2
1. GENERAL INFORMATION
1.1 PRODUCT DESCRIPTION
DESMI SA50-T is a portable centrifugal pump. The pump is a single-stage self-priming centrifugal
pump with stainless steel shaft, and mechanical shaft seal, and is further equipped with a semi-open
impeller, which does not choke as easily as a closed impeller.
SA50-T is equipped with quick release couplings in aluminium on both suction and pressure branch.
Further it can be equipped with a Hatz engine of type 1B20 or 1B30. Pump and engine are mounted
in a tubular frame.
The pump is suited for clean and polluted liquids.
The pump is equipped with a clack valve in the suction branch of the pump which is mounted well
above impeller inlet. This is an advantage as the pump will not lose all the priming water and
consequently the priming ability in case of a leaking clack valve.
The pump shaft is fitted direct on the engine shaft.
As the pump is self-priming, a foot valve will not be necessary on the suction line, just as the pump,
contrary to ordinary centrifugal pumps , will resume pumping if, for a short moment, the liquid has
been lowered to a level below the suction pipe.
The pump casing and the intermediate piece are cast in an aluminium alloy.
The Hatz engine of type 1B20 or 1B30 is a highly-developed compact single-cylinder low-noise
diesel engine with a low weight. The engine is easily started either with electric starter and recoil
starter or with recoil starter only. (Recoil starter = Manual rope starting).
SA50-T meets the "E" requirements of the Danish Maritime Authority.
SA50-T is a quality product in accordance with ISO 9001.
1.2 NAME PLATE
Manufacturer:
DESMI PUMPING TECHNOLOGY A/S
DK - 9400 Nørresundby
Tel.: [phone]
Fax: [phone]
TYPE:........... Pump type
CODE NO.:... Pump code
PUMP NO.:... Pump No.
IMP:.............. Impeller diameter
WEEK:.......... Production week
YEAR:........... Production year
Made in Denmark
CE-mark

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 3
All SA50-T pumps areequipped with a name plate, and thetype designationindicates suction branch
diameter, standard impeller diameter, height of the impeller blades, and engine type.
1.2.1 TYPE DESCRIPTION
TYPE: SA50-T (50-135/14) HATZ 1B20/30
SA50-T: DESMI pump with engine
50: Suction branch diameter
135: Standard impeller diameter
14: Height of the impeller blades
HATZ 1B20/30: HATZ engine type 1B20 or 1B30

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 4
1.3 EU DECLARATION OF CONFORMITY
DESMI PUMPING TECHNOLOGY A/S, hereby declare that our pumps of the type SA50-T 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. Safetydistances to 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, Marts 05 2019
Henrik Mørkholt Sørensen
Managing Director
DESMI Pumping Technology A/S
Tagholm 1
9400 Nørresundby

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 5
1.4. 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.
2. WARNINGS
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.
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.
For safety reasons the pump is only allowed to operate against a closed discharge
valve for a short time (max. 2 minutes). To protect the pump against unintentional
operation it is equippedwith a relief valve which opens at a preset pressure (6.0 bar).
Be careful: When the valve opens, the temperature of the escaping liquid may have
been elevated.
The relief valve must in no circumstances be removed or re-adjusted !
As regards maintenance of the relief valve - see paragraph 3.3
3. OPERATION
3.1. START-UP
A self-priming centrifugal pump will not function until the pump casing has been filled
with liquid. Remove the plug at the top of the pump casing and fill the pump with cold
liquid. Fit the plug and the pump is ready for service
The liquid also serves as coolant for the shaft seal. Consequently, the pump must in
no circumstances be started before it has been primed with liquid. Furthermore, the
pump must never run dry.
3.1.1 STARTING
Before starting the pump check that
the shaft rotates freely without jarring sounds (pull the starting rope carefully)
the pump casing is filled with liquid.

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 6
3.2 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 to read
the differential pressure, as the quantity of liquid can then 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
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 7
FAULT
CAUSE
REMEDY
The pump does not prime
1. The pump is not filled
with liquid
2. Leaking clack
valve in pump
3. Air is drawn in because
of too little liquid or
leaking suction line
4. Liquid lock in outlet
line
6. Temperature of liquid
too high
7. Air cannot escape on
pressure side
Fill pump casing with liquid
Remove foreign body in
pump/Remove any coating
on mating faces
Lower suction pipe/
Tighten suction line
Change the pressure line
so that the air can pass out
freely
Replace liquid in pump
casing/Wrong
dimensioning/Contact
DESMI
Ventilate the system
The pump has no or too low
capacity
1. Piping system choked
2. The pump is choked
3. Suction line leaks,
pump takes air
4. Suction lift too high
5. Pump and piping system
wrongly dimensioned
Clean or replace
Clean the pump
Find the leakage/repair the
fault/clack valve not
submerged
Check data sheet Q/H curve
and NPSH or contact DESMI
As 4
The pump uses too much
power
1. Counter-pressure too
low
2. The liquid is heavier
than water
3. Foreign body in pump
Insert orifice plate or check
valve/Contact DESMI
Contact DESMI
Dismantle the pump, remove
the cause
The pump makes noise
1. Cavitation in pump
2. Foreign body in pump
Suction lift too high/ Suction
line wrongly
dimensioned/Liquid
temperature too high
Dismantle the pump, remove
the cause

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 8
3.3 INSPECTION AND MAINTENANCE
Before any inspection of the pump, check that the unit 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 with
the safety measures he is to take when handling the liquid.
Inspect the shaft seal for leaks at regular intervals.
Activate the relief valve at regular intervals in order to check the function. If the valve is choked,
replace or clean it, if possible.
3.3.1 DRAINING THE PUMP
When the piping system has been drained, note that there is still some liquid left in the pump.
Remove the remaining liquid by dismantling the pipe plug (pos. 14) at the bottom of the pump.
3.4. 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.
3.5 NOISE LEVEL
The noise level indicated is the airborne noise including the engine.
Pump type
Distance 7 metres
Distance 1 metre
SA50-T HATZ 1B20
74dB(A)
87dB(A)
SA50-T HATZ 1B30
75dB(A)
88dB(A)
4. ASSEMBLING - REPAIR - DISMANTLING
4.1 FROM DELIVERY TO ASSEMBLING
4.1.1 DELIVERY
Check on receipt that the delivery 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.
4.1.2 TRANSPORT / STORAGE
Weight of pump - see paragraph 5.1.1
The pump is to be stored in a dry area.
Before shipment the pump is to be fastened securely on a pallet or the like.
SA50-T HATZ 1B20/30 is to be lifted in the following way:
Place the lifting strapscornerwise in such a way that thepump is in balancewhen
lifted.
The lifting straps must not bear against sharp edges and corners.

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 9
4.1.3 ASSEMBLING PUMP
The suction line to the pump is to be mounted carefully, so that it is absolutely tight, as even small
leakages may impede the priming. When pumping polluted liquids a strainer is necessary. The
strainer must be equipped with a sieve, the passage area of which is to be 3 x the area of the suction
pipe. The mesh size is to be 1-3 mm smaller than the height of the impeller blades of the pump in
question.
4.1.4 INSTALLATION
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..
4.2 DISMANTLING PUMP
4.2.1 INSPECTION
When the pump has been dismantled, check the following parts for wear and damage:
Wear plate/impeller: Max. clearance 0.4 - 0.6 mm.
Shaft seal/intermediate piece: Check seat for flatness and cracks.
Check rubber parts for elasticity.
4.3 ASSEMBLING PARTS IN THE PUMP
4.3.1 FITTING INTERMEDIATE PIECE
Fit the intermediate piece on the engine.
4.3.2 FITTING SHAFT
Screw the pump shaft direct on the diesel engine shaft until it bears against the taper of the pump
shaft.
When the pump has been assembled, check that the shaft rotates freely.
4.3.3 FITTING SHAFT SEAL
Before fitting the seat, clean the recess in the intermediate piece. When fitting the seat, remove the
protective coating without scratching the lapped surface. Dip the outer rubber ring of the seat in
olive oil (or another acid-free oil). Now press the seat into place with the fingers, and check that all
parts are correctly imbedded.
If it is necessary to use fitting tools, then protect the sliding surface of the seat to prevent it from
being scratched or cut. Lubricate the inner diameter of the rubber bellows on the slide ring with
olive oil and push it over the shaft.
The use of a 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 oil on the shaft, the bellows will settle and seat in about 15 minutes and until
then tightness should not be expected.

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
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After start, check by viewing the leak hole that there are no leaks.
If the pump is equipped with a shaft seal type different from a rubber bellows seal, contact DESMI
and ask for an installation instruction.
4.3.4 FITTING IMPELLER
Fit the sunk key in the shaft and lead the impeller towards the shoulder of the shaft. Take care that
the ring at the end of the shaft seal spring locates in the recess of the impeller. Secure the impeller
with a washer and a nut. Check that the axial distance between impeller and pump casing is between
0.4 and 0.6 mm. Adjust with shims (pos. 9) between pump casing and intermediate piece, if
necessary.
4.4 REPAIR
4.4.1 ORDERING SPARE PARTS
When ordering spare parts please always state pump type and pump No. (appears on the name
plate of the pump). See also spare parts drawing with item Nos.
4.5 DISMANTLING
Before dismantling the pump make surethat 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.

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 11
5. TECHNICAL SPECIFICATION
5.1 PUMP
5.1 1 WEIGHT OF PUMP
The weight of the pump (material combination AlMg4 casing and St.18/8 impeller) with engine and
frame.
5.2 ENGINE
5.2.1 ENGINE IN GENERAL
See engine manual.
5.3 OPERATING DATA
The max. rpm of SA50-T is 3600.
Max operating pressure = 4 bar
Pump
Weight incl. liquid
Weight excl. liquid
SA50-T HATZ 1B20
with recoil starter
57 kg
50 kg
SA50-T HATZ 1B20
with electric and recoil starter
65 kg
58 kg
SA50-T HATZ 1B30
with recoil starter
64 kg
55 kg
SA50-T HATZ 1B30
with electric and recoil starter
72 kg
63 kg

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 12
5.4 ASSEMBLY DRAWING –TYPICAL

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 13
5.4.1 SPARE PARTS LIST - TYPICAL
Designation:
Pos.:
Pump casing
01
Intermediate piece
02
Suction branch
04
Sunk key
05
Impeller
06
Clack valve plate
07
Nut
08
Shim
09
Shaft seal
10
Clamp plate
11
Centre spring washer
12
Pipe plug
13
Pipe plug
14
Bend
15
Diesel engine Hatz
16
Stud
17
Screw
18
Set screw
19
Stud
21
Nut
22
Nut
23
Lock washer
24
Washer
25
O-Ring
26
Shaft
27
Clack valve
28
Sealing washer
29
Washer
30
Frame
31
Base
32
Centre spring washer
33
Nut
34
Vibration damper
35
Sealing washer
36
Nut
37
Centre spring washer
38
Set screw
39
Starting battery
40*)
Frame for battery
41*)
Battery retainer
42*)
Washer
43*)
Locking nut
44*)
Washer
45
Nut
46
Storz coupling
47
Frame for battery
48*)
*) Only apply to pumps
with electric starting
Screw
49*)
Centre spring washer
50*)
Plate
51
Plate
52

DESMI PUMPING TECHNOLOGY A/S
Tagholm 1
9400 Nørresundby - Denmark
Tel.: [phone]
Fax [phone]
E-mail: [e-mail]
www.desmi.com 14
5.5 DIMENSIONAL SKETCH –TYPICAL