Manual Speroni ME (page 10 of 52) (English, German, French, Italian, Spanish)

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1. General

This manual is meant to provide the user with the

essential information required for installing, using and

servicing the pumps.

A fault-finding chart indicating possible cause and

remedy for every problem which might occur, is

included.

2. Technical characteristics and materials

The electric pumps are the centrifugal, radial, close-

coupled type, with single impeller.

• Cast iron pump-body and support, stainless steel

threaded counter flanges.

• Stainless steel motor shaft; bronze impeller for the

high head range; cast iron impeller for the low head

range.

• Mechanical seal housing standardized to DIN 24960.

The mechanical seal is lubricated by the pumped

liquid.

• All the electric pumps come fitted with threaded

counter-flanges.

• Amply dimensioned ball-bearings pre-packed with

special grease for life.

• 2 pole electric motors of enclosed type, IP 55, with

external ventilation; insulated according to Class F.

• Standard supply voltages:

50 Hz=230/400 V

up to 7,5 kW - 400/700 V

for higher power ratings.

60 Hz=230/400 V for all powers.

Standard voltage V 230 - 50 Hz.

On request, special voltages available.

• In the standard versions the electric pumps are

suitable for fluid temperatures up to 90°C.

• Maximum working pressure: 10 Bar.

3. Applications

The electric pumps are suitable for application in the

civil, agricultural and industrial fields, to pump chemi-

cally or mechanically non aggressive liquids. Any

suspended solid particles should not exceed 2% by

weight. The following are but a few typical applications:

water supply systems, irrigation schemes, pressure

tank feed, pressure boosting, air conditioning system,

heating systems.

4. Installation

The pumps may also be located outdoor, provided

they are suitable protected by a roofing; they can also

be installed inclined or vertically.

Warning:

For operation in hot damp environments, the pump

should not be installed orientated to different directions

than normal, to avoid condensation water building up

inside the motor.

Avoid vertical position with motor facing down ward

(see installation diagram - Fig. 5).

Being generously dimensioned, these pumps can be

supported by the pipework of the system to which

they are applied, even though it would be preferable

- where possible - to secure them firmly to a bedplated

by means of four holding-down bolts fitted through

the holes provided in the pump feet. Firm mounting

will aid to damp down vibrations, if any.

A satisfactory installation should conform to the

following indications:

The suction pipe, the inside diameter of which should

never be smaller than the pump inlet, should be

dimensioned consistently with the system and the

pumped liquid. Bear in mind that the maximum theo-

retical suction lift not only is reduced by the NPSHr

required by the pump, which is a peculier characteristic

of the pump itself, but is also reduced by the height

above sea level of the installation and the friction

losses occurring in the suction line.

Therefore, in order to avoid cavitation, which would

generate noise, performance drop and vibrations that

might exert undue mechanicals stress on the pump,

the following relation should always be observed:

hp + hz ≥ (NPSHr + 0.5) + hf + hpv

where:

is the absolute pressure acting on the free surface of

the liquid in the suction reservoir, expressed in meters

of liquid. hp is the quotient between the barometric

pressure and the specific weight of the liquid.

is the difference in level between the pump axis and

the free surface of the liquid in the suction reservoir

expressed in metres. hz is negative when the liquid

level is below the pump axis.

is the head loss occurring within the suction line and

the fittings fitted to it, such as connectors, foot valve,

sluice valves, bens, etc.

INSTRUCTIONS FOR THE INSTALLATION AND USE OF ELECTROPUMPS

fig. 1 - Pump installation

The head losses can be read from the diagram shown

in our catalogue, and in order to reduce them to a

minimum - mainly where suction is remarkable (over

4-5 metres) or when operating at the highest flow

rates - it is advisable to use a section pipe larger than

the pump inlet. In all cases it is advisable that the

pump be installed as close as possible to the source

of the pumped liquid.

hpv

is the vapour pressure of the liquid at the operating

temperature, expressed in metres of liquid. hpv is

the quotient between the vapour pressure and the

specific weight of the liquid.

0.5

is a margin of safety.

From the above relation it can be gathered that the

maximum permissible suction lift in an installation

depends on the value of the atmospheric pressure

(i.e. the height above sea level of the installation) and

the liquid temperature. To facilitate the user’s task,

tables are provided which - the datum being water

at 4°C and at sea level - indicate the decrease in the

hydraulic pressure head as a function of the height

above sea level and the suction losses as a function

of the temperature.

Height above

sea level (m)

Suction losses

in m.

500 0,55

1000 1,1

1500 1,65

2000 2,2

2500

3000 3,3

2,75

21,5

Water

temperature (°C)

Suction

loss (m)

20 0,2

40 0,7

60 2,0

80 5,0

90 7,4

110 15,4

120

Wrong

• Reducer and negative inclination

generate air locks

• Scanty immersion=vortex

and whirlpools

• Sharp bends

• Narrow piping

Right

• Eccentric reducer

• Positive inclination

• Good immersion

• Ample bends

• Suction pipe dia.≥ pump inlet

• Check valve at the delivery

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Speroni ME Manual

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