Caution
Caution
Caution
Caution
Caution
RPH
12
6.1.7
Start-up
Before starting the pump, ensure that the shut-off valve in the
suction line is fully open! The pump may be started up against
a closed discharge-side swing check valve or slightly open
shut-off valve. Only after the pump has reached full rotational
speed shall the shut-off valve in the discharge line be opened
slowly and adjusted to comply with the duty point. When starting
up against an open discharge-side shut-off valve, take the
resulting increase in input power into account!
Pump operation with the shut-off valves
in the discharge and suction pipes closed
is not permitted.
The permissible pressure and temperature limits might be
exceeded. In extreme cases, the pump may burst.
After the operating temperature has been
reached and/or in the event of leakage, switch
off the unit allow to cool down and re-tighten the bolts between
volute casing and casing cover. Permissible tightening torques
see 7.5.3.
Check the coupling alignment at operating
temperature as described in section 5.3.1 and
re-align, if necessary.
6.1.8
Shutdown
Close the shut-off valve in the discharge line.
If the discharge line is equipped with a non-return or check
valve, the shut-off valve may remain open. If shut-off is not
possible, the pump will run in reverse direction.
This may cause damage to mechanical seals
which are not bi-directional!
The reverse runaway speed must be lower than the rated
speed.
Switch off the drive, making sure that the unit runs down
smoothly to a standstill.
Close the auxiliary lines but do not turn off the cooling liquid
supply, if any, until the pump has cooled down.
Please refer to section 6.1.2!
In the event of frost and/or prolonged shutdowns, the pump -
and the cooling chambers, if any - must be drained or otherwise
protected against freezing.
6.2
Operating limits
The pump’s/unit’s application limits regarding pressure,
temperature and speed are stated on the data sheet and
must be strictly adhered to!
If a data sheet is not available, contact KSB!
6.2.1
Temperature of the fluid handled, ambient
temperature, bearing temperature
Do not operate the pump at temperatures
exceeding those specified on the data sheet or
the name plate unless the written consent of the manufacturer
has been obtained. Damage resulting from disregarding this
warning will not be covered by the KSB warranty.
Bearing bracket temperature see 7.2.1.
The safety instructions set forth in section 2.9 must be
complied with.
6.2.1.1 Heating the stand-by pump
To make sure that the stand-by pump is operational at all times
and to keep it warm, no special precautions need to be taken,
provided
-
all cooling points are in operation and
-
the permissible nozzle forces and moments are not
exceeded.
For extreme operating conditions, please contact KSB Pegnitz.
6.2.2
Switching frequency
To prevent high temperature increases in the motor and
excessive loads on the pump, coupling, motor, seals and
bearings, the switching frequency shall not exceed the
following number of start-ups per hour (S).
Motor rating (kW)
max. S (start-ups/h)
up to 12
15
up to 100
10
more than 100
5
If the above switching frequencies are exceeded, please
contact the motor manufacturer or KSB.
6.2.3
Density of fluid pumped
The power input of the pump will increase in proportion to the
density of the fluid pumped. To avoid overloading of the motor,
pump and coupling, the density of the fluid must comply with the
data specified on the purchase order.
6.2.4
Abrasive fluids
When the pump handles liquids containing abrasive
substances, increased wear of the hydraulic system and the
shaft seal are to be expected. The intervals recommended for
servicing and maintenance shall be shortened.
6.2.5
Minimum/Maximum flow
For max. flow Q
max
please refer to the characteristic curves.
Unless other limits are specified in the characteristic curves or
data sheet, the minimum flow for
50 Hz and
r
= 1.2 kg/dm
3
60 Hz and
r
= 1.0 kg/dm
3
is Q
min
= 0.3 x Q
Opt
.
Q
opt
= optimum efficiency
The data refer to water and water-like liquids. However, if the
physical properties of the fluids handled are different from
water, the calculation formula below must be used to check if an
additional heat build-up may lead to a dangerous temperature
increase at the pump surface. If necessary, the minimum flow
must be increased.
T
o
= T
f
+
D J
g * H
D J
=
* ( 1 -
h
)
c *
h
c
Specific heat
[J / kg K]
g
Acceleration due to gravity
[m/s
2
]
H
Pump head
[m]
T
f
Temperature of fluid handled
[
°
C]
T
o
Temperature of casing surface
[
°
C]
h
Pump efficiency at duty point
[-]
D J
Temperature difference
[
°
C]
6.3
Shutdown / storage / preservation
Each KSB pump leaves the factory carefully assembled. If
commissioning is to take place some time after delivery, we
recommend that the following measures be taken for pump
storage.
6.3.1
Storage of new pumps
-
New pumps are supplied by our factory duly prepared for
storage. Maximum protection for up to 12 months, if the
pump is properly stored indoors.
-
Store the pump in a dry location.
-
Rotate the shaft by hand once a month.
