Desmi SA Series Troubleshooting guide

__________________________________________________________________________________

DESMI Pumping Technology A/S

Tagholm 1

9400 Nørresundby –Denmark

Tel: +45 96 32 81 11 Fax: +45 98 17 54 99

E-mail: [email protected]

www.desmi.com

OPERATION AND MAINTENANCE INSTRUCTIONS

DESMI self-priming centrifugal pump

TYPE SA

Monobloc design

DESMI Pumping Technology A/S

Tagholm 1 –DK-9400 Nørresundby –Denmark

Tel.:

+45 96 32 81 11

Fax:

+45 98 17 54 99

E-mail:

[email protected]

Internet:

www.desmi.com

Manual:

T1517

Language:

English

Revision:

E (11/20)

Special pump nr. .................

 
__________________________________________________________________________________ 
DESMI Pumping Technology A/S 
Tagholm 1 
Nørresundby –Denmark 
Tel: +45 96 32 81 11 Fax: +45 98 17 54 99 
E-mail: [email protected] 
www.desmi.com 
 
Table of Contents: 
PRODUCT DESCRIPTION ...............................................................................................................................1 
1 DELIVERY .............................................................................................................................................................1 
TECHNICAL DATA .........................................................................................................................................1 
1 EXPLANATION OF THE TYPE NUMBER.................................................................................................................1 
2 TECHNICAL DESCRIPTION....................................................................................................................................2 
. INSTALLATION.............................................................................................................................................3 
1 MOUNTING/FASTENING .....................................................................................................................................3 
2 WIRING................................................................................................................................................................3 
TRANSPORT/ STORAGE ................................................................................................................................4 
INSPECTING THE PUMP ................................................................................................................................4 
1 INSPECTION.........................................................................................................................................................4 
2 FITTING SHAFT SEAL ............................................................................................................................................4 
3 SHAFT ..................................................................................................................................................................5 
FROST PROTECTION .....................................................................................................................................5 
DISMANTLING..............................................................................................................................................5 
START-UP.....................................................................................................................................................5 
1 STARTING ............................................................................................................................................................5 
SYSTEM BALANCING.....................................................................................................................................6 
INSPECTION AND MAINTENANCE ...............................................................................................................8 
1 DRAINING THE PUMP ........................................................................................................................................8 
2 BEARINGS ..........................................................................................................................................................8 
REPAIRS - ORDERING SPARE PARTS.............................................................................................................8 
OPERATING DATA ......................................................................................................................................9 
EU DECLARATION OF CONFORMITY ..........................................................................................................10 
INFORMATION RELEVANT FOR DISASSEMBLY OR DISPOSAL AT END-OF-LIFE..............................................11 

____________________________________________________________________________________

DESMI Pumping Technology A/S 1

Tagholm 1

9400 Nørresundby –Denmark

Tel: +45 96 32 81 11 Fax: +45 98 17 54 99

E-mail: [email protected]

www.desmi.com

1. PRODUCT DESCRIPTION

These operation and maintenance instructions apply to the DESMI SA-pump in Monobloc design.

DESMI SA is a single-stage self-priming centrifugal pump with stainless steel shaft and mechanical shaft

seal. The SA-pump is further equipped with a semi-open impeller which does not choke as

easily as a closed impeller.

The pump is suitable for pumping clean and polluted liquids with temperatures between 0 and 80C. With

special shaft seal up to 120C.

The suction branch of the pump is mounted well above impeller inlet. This is an advantage as the pump

will not - in case of a non-return valve leakage - lose all the priming water and consequently the priming

ability.

The pump has compact structure which provide convenient installation without having toalign the coupling.

As the pump isself-priming, afoot valvewill not benecessary onthe suction line, just asthe 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 is particularly suitable for the pumping of water in connection with e.g. cooling of diesel engines,

as bilge pump, ballast pump, irrigation, washing plants, air conditioning, cooling systems, and sanitary

systems, etc. Furthermore, in the majority of cases where the transport of liquid is required within industry.

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.

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 SA-pumps are provided with a name plate. The type number indicated on the name plate is built

up as follows:

SA-XXX-YYY-ZZ-MRO

XXX,YYY,ZZ : Pump size where

XXX : Suction branch diameter.

YYY : Standard impeller diameter.

ZZ : Height of the impeller blades.

M : The material combination of the pump.

R : The assembly combination of the pump.

O : The direction of rotation of the pump, anti-clockwise/clockwise.

____________________________________________________________________________________

DESMI Pumping Technology A/S 2

Tagholm 1

9400 Nørresundby –Denmark

Tel: +45 96 32 81 11 Fax: +45 98 17 54 99

E-mail: [email protected]

www.desmi.com

M may be the following:

A : Pump casing: Grey cast iron. Impeller/wear plate: Bronze.

B : Pump casing: Grey cast iron. Impeller/wear plate: Stainless steel.

C : All grey cast iron.

D : Casing: Bronze. Impeller/wear plate: Bronze.

E : All stainless steel material.

F : All aluminium.

The pumps are available in other material combinations at request.

R may be the following: (This manual is only for 02 type)

01 : Flange-mounted with magnetic clutch and pulley.

02 : Flange-mounted with electric motor.

03 : Flange-mounted with hydraulic motor, or with petrol or diesel engine.

04 : Mounted with manual disengaging clutch and pulley.

05 : Mounted with manual disengaging clutch for direct coupling.

06 : Mounted on base frame with V-belt drive.

07 : Mounted on base frame with petrol or diesel engine, or with hydraulic or electric motor.

08 : Mounted on a trolley with petrol or diesel engine, or with hydraulic or electric motor.

09 : With bare shaft end.

10 : Special-tailored according to task.

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.

Pumps in material combinations A and C are primarily used for fresh water.

Pumps in material combination D are primarily used for sea water.

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 of the motor appears from the instruction manual for the motor.

The pump capacity appears on the name plate of the pump. If the pump has been delivered without motor,

the pump capacity is to be indicated on the plate when mounting the motor.

All pumps from size SA35 (inclusive) are equipped with a relief valve.

The permissible loads on the flanges are indicated in the following table:

____________________________________________________________________________________

DESMI Pumping Technology A/S 3

Tagholm 1

9400 Nørresundby –Denmark

Tel: +45 96 32 81 11 Fax: +45 98 17 54 99

E-mail: [email protected]

www.desmi.com

Pump

Fv (N)

Fh (N)

F (N)

Mt (Nm)

SA-25-122

650

500

820

100

SA-35-135

900

700

1140

140

SA-50-180

1250

950

1550

170

Fv : The max. permissible sum of the vertical forces on the two flanges.

Fh : The max. permissible sum of the horizontal forces on the two flanges.

F : The vectorial sum of the two forces Fv and Fh.

Mt : The max. permissible sum of the torches on the two flanges.

In connection with the permissible loads on the flanges the following is to be observed:

Where index "calc" is the values calculated by the user.

3 . INSTALLATION

3.1 MOUNTING/FASTENING

The pump can be mounted on board directly, and don’t need to spend extra time to align centre line of

pump and motor.

The pump must be installed with horizontal shaft and the pump casing discharge side vertically upwards.

The max. permissible loads on the flanges stated in paragraph 2.2. are to be observed.

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.

The pipes are to be arranged in such a way that stresses resulting from fluctuations in temperature will not

have any effect on the pump. Because of the priming of the pump the pressure pipe is to be arranged so

that water locks in the pipe are avoided. While installing the pump the following must be observed:

- Avoid distortion of the base plate.

- Avoid distortion of the piping system.

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.





























calccalc M

____________________________________________________________________________________

DESMI Pumping Technology A/S 4

Tagholm 1

9400 Nørresundby –Denmark

Tel: +45 96 32 81 11 Fax: +45 98 17 54 99

E-mail: [email protected]

www.desmi.com

4. TRANSPORT/ STORAGE

The weights of the pumps in A02/D02 combination (without motor) are stated in the following table:

Pump

Weight(Kg) A/D

SA 25-122

23/25

SA 35-135

41/45

SA 50-180

53/59

Lift the pump by placing the rope around it and see to it that the pump is balanced.

The rope must not bear against sharp edges and corners.

Lifting eyes might be mounted in the pump and used instead.

Before shipment the pump is to be fastened securely on a pallet or the like.

The pump is to be stored in a dry area.

5. INSPECTING THE PUMP

5.1 INSPECTION

When the pump has been dismantled, check the following parts for wear and damage:

- Wear plate/impeller : Max. clearance 0.4 - 0.5 mm.

- Shaft seal/rear cover : Check seat for flatness and cracks.

Check rubber parts for elasticity.

- Bearings : Replace in case of wear and noise.

5.2 FITTING SHAFT SEAL

Before fitting the seat, clean the recess in the intermediate cover. 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 neutral 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, 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 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 oil 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 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.

____________________________________________________________________________________

DESMI Pumping Technology A/S 5

Tagholm 1

9400 Nørresundby –Denmark

Tel: +45 96 32 81 11 Fax: +45 98 17 54 99

E-mail: [email protected]

www.desmi.com

5.3 SHAFT

When the pump has been assembled, check that the shaft rotates freely.

6. 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.

7. 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.

8. 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 under no circumstances be started before it has been primed with liquid.

Furthermore, the pump must never run dry.

WARNING

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.

To protect the pump against unintentional operation it is equipped with a relief valve which opens at a

pre-set pressure.

Be careful: When the valve opens, the escaping liquid will be hot.

The relief valve must in no circumstances be removed or re-adjusted!

As regards maintenance of the relief valve - see paragraph 10.

8.1 STARTING

Before starting the pump check that

- The shaft rotates freely without jarring sounds.

- The pump casing is 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.

____________________________________________________________________________________

DESMI Pumping Technology A/S 6

Tagholm 1

9400 Nørresundby –Denmark

Tel: +45 96 32 81 11 Fax: +45 98 17 54 99

E-mail: [email protected]

www.desmi.com

9. 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 does not

prime

1. The pump is not filled

with liquid

2. Leaking non-return

valve in pump

3. Wrong direction of

rotation

4. Air is drawn in because

of too little liquid or

leaking suction line

5. 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

Change direction of rotation

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

____________________________________________________________________________________

DESMI Pumping Technology A/S 7

Tagholm 1

9400 Nørresundby –Denmark

Tel: +45 96 32 81 11 Fax: +45 98 17 54 99

E-mail: [email protected]

www.desmi.com

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

7. RPM too low

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

Fit smaller V-belt pulley on

pump. Change RPM of

electric motor

FAULT

CAUSE

REMEDY

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

5. RPM too high

6. Pump and electric

motor not aligned.

Insert orifice plate or check

valve/Contact DESMI

Contact DESMI

Dismantle the pump, remove

the cause

Check fuses, cable

connection, and cable

Fit bigger V-belt pulley on

pump. Change RPM of

electric motor.

Align unit (see para. about

alignment)

The pump capacity is

unstable

1. Suction line leaks

2. Air pockets in suction

line

3. The pump takes air

Tighten suction line

Normally the disappear in a

short time

Liquid reservoir emptied/

Suction line not sufficiently

submerged

The pump makes

noise

1. Cavitation in pump

2. Defective bearings

Suction lift too high/ Suction

line wrongly

dimensioned/Liquid

temperature too high.

Replace bearings

____________________________________________________________________________________

DESMI Pumping Technology A/S 8

Tagholm 1

9400 Nørresundby –Denmark

Tel: +45 96 32 81 11 Fax: +45 98 17 54 99

E-mail: [email protected]

www.desmi.com

10. 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.

10.1 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 at the bottom of the pump.

10.2 BEARINGS

The pump is equipped with ball bearings which were lubricated for life before leaving the factory.

Therefore, they require no attention but are to be replaced in case of noise or bearing wear. Place a

bead of grease on the sides of cleaned or newly mounted bearings. As fas as semi-closed bearings are

concerned, place grease on the open side of the bearing only.

A recommended grease quality on a lithium-basis is used:

ESSO ................................................ Beacon 2

BP...................................................... Energrease EP grease 2

Shell .................................................. Alvania grease 2

Mobil.................................................. Mobil lux grease EP 2 or Mobil plex 47

Castrol............................................... Spherol AP2

Texaco............................................... Multifak EP 2

Q8...................................................... Rembrandt EP 2 and Rubens

Statoil ................................................ Statoil Uniway U2

11. REPAIRS - 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.

This manual suits for next models

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