Shutdown; Service Limits; Switching Frequency; Temperature Of The Liquid To Be Pumped - KSB AU Manuel D'instructions

The pump must NEVER work with zero flow or flow
which is less than the operating minimum, as internal
recirculation will cause the fluid to heat up quickly,
leading to hazards (including explosion) as a result of the high
pressures reached within the frame. Check the minimum flow
in the operation curves.
Minimum flow necessary for the pump
The pumps cannot work below the minimum flow specified in
the datasheets.
If this condition may come about, the installation must be fitted
with safety devices which prevent the operation of the pump
without liquid inside, or have automatic devices to discharge
the minimum necessary flow of the pump.
For liquids other than water, the minimum flow is determined
by the following formula:
3.600.000 x Pa
Qmin =
Pe x Ce
In which:
3
Qmin: Minimum flow in m
Pa: Power absorbed by the pump in kW at closed valve.
Ce: Specific heat of the fluid in J/kg*ºC.
Pe: Specific weight of the fluid in kg/m
Maximum flow permitted by the pump
Unless indicated in another datasheet, the maximum flow
permitted is 1.1x optimum flow of the pump with the supplied
impeller diameter.
6.1.5

Shutdown

Close the discharge pipe valve.
If there is anti-return in discharge with counterpressure, leave
the discharge valve open.
- Shutdown the motor. Check that shutdown is normal.
- In prolonged periods of non-operation, close the suction
pipe valve and the auxiliary connection valves.
- In suction pumps using a low vacuum tank, the supply of
liquid must also be maintained at the shaft seal whilst the
pump remains shutdown.
- The pump must be protected from freezing whenever this
risk exists, and must be emptied in prolonged periods of
non-operation.
If, whilst the pump is shutdown, it must remain on standby for
service, start up at regular intervals for around 5 minutes (see
also 7.2):
- Fire pumps: 1x/month, at minimum.
- Drink-safe water pumps: 1x/48 hours, at minimum.
- Reserve pumps: 1x/week, at minimum.
(It is best to change the operating pump every day).
The seal tightness and function of the auxiliary connections
must be examined during these start-ups.
6.2

Service limits

6.2.1

Switching frequency

In order to prevent abnormally high temperatures and
overloading of the motor, pump, coupling, seals, etc, the
switching frequencies indicated below must not be exceeded:
/h
3
MOTOR POWER
Up to 3 kW
From 4 to 11 kW
From 11 to 45 kW
From 45 kW
6.2.2

Temperature of the liquid to be pumped

The permitted operation temperature is indicated in
the order and in the ATEX conformity declaration. If
the pump is to work at a higher temperature or you do not
have the data sheet, please ask KSB ITUR.
6.2.3

Density of the liquid to be pumped

The power absorbed by the pump increases in direct
proportion to the density of the impelled liquid. In order
to prevent overloading in the motor, pump and coupling, this
density must not exceed that shown in the order and in the
ATEX declaration of conformity.
6.2.4

Viscosity of the liquid to be pumped

The power absorbed by the pump increases with the
viscosity of the impelled liquid. In order to prevent
overloading in the motor, pump and coupling, this viscosity
must not exceed that shown in the order and in the ATEX
declaration of conformity.
6.2.5

Maximum pump speed

In order to protect the pump from over speed, the maximum
rotation speed shall be that shown on the name plate
engraved in the pump- If the speed shall not be indicated in
the name plate it is necessary to consult with KSB ITUR.
If eventually it would be wished to perform the pump at higher
speed, it is necessary to consult with KSB ITUR.
6.3

Starting up after storage

If the storage and/or shutting down of the pump has been for
a prolonged period of time (over 6 months), it is necessary to:
- Check the state of the joints.
- Check the levelling.
- Check all the auxiliary connections.
- Renew the lubrication of the bearings (where fitted).
- Change the packing (when fitted).
- After a short storage period, simply turn the pump shaft
manually to unlock the rotor equipment.
- Follow the specific post-storage instructions in the motor
manuals and other items.
- Observe all the steps shown in the "Start-up" section.
If the equipment is to be halted for a certain
Note
period of time and there is the possibility of
freezing temperatures, it is necessary to completely drain the
pump in order to prevent any deterioration from the freezing of
the contained fluid.
7

Maintenance/Conservation

7.1

General instructions

Before dismounting, ensure that:
The motor must not be started up involuntarily, and
so must be disconnected from the grid (e.g.
removing cut-outs, unplugging, disconnecting the
AU
MAX. SWITCHING/HOUR
20
15
10
5
11