Limits Of Operation; Lubrication Of Bearings; Monitoring; Shutting Down - Lowara TDB Série Instructions Pour L'installation Et L'emploi

Installation, Operating and Maintenance Instruction
Be particularly careful not to touch hot machine
parts and when working in the unprotected shaft
seal area. Remember
controlled systems may switch themselves on
suddenly at any time. Suitable warning signs
should be affixed.

6.4 Limits of Operation

The operating limits of the pump / unit regarding
pressure, temperature, performance and speed are
shown in the data sheet and / or order confirmation
and must be observed under any circumstances!
Do not exceed the output given on the motor
name plate.
Avoid sudden
(temperature shocks).
The pump and motor should run evenly and
without vibrations; check at least once a week.
6.4.1 Flow min. / max.
If no other data are given in the curves or data sheets,
the following is valid:
Q = 0,1 x Q for for short time operation
min BEP
Q = 0,3 x Q for continuous operation
min BEP
Q = 1,2 x Q for continuous operation *)
max BEP
Q = Flow in efficiency optimum
BEP
*) on condition that NPSH
facility
6.4.2 Permitted number of starts
With electric motors, the permitted number of starts is
given in the attached motor operating instructions.
If two different figures are given, the lower figure is
valid.
If no values for the switching frequency are given in
the motor operating manual, the values according to
table apply.
3
kW 0,25 ÷ 3 4 ÷ 7,5
n 60 40
kW 30 ÷ 37 45 ÷ 110 132 ÷ 355
n 16 8

6.5 Lubrication of Bearings

Grease Lubrication – TDV Design Only
For quality of grease refer to chapter 7.3.
For quantity of grease refer to chapter 7.3.
The bearings are already filled with lithium based
grease at the factory and are thus ready for use.
The grease provided is suitable for a temperature
range from -30° to +90° C (measured at surface of
bearing bracket).
Re-lubrication via the two grease nipples (G).
Bearing temperature
bracket) should lie max. 50° C over ambient
temperature and must not exceed 90° C, control
weekly at least. On grease lubrication the bearing
temperature can temporarily be higher by 5-10° C
TDB, TDV
that automatically
changes in temperature
> (NPSH + 0,5 m)
pump
11 ÷ 15 18,5 ÷ 22
30 24
4
(measured at bearing
page 61
after regreasing, till a possible surplus of grease in
the bearings is cut.

6.6 Monitoring

Regular monitoring and maintenance will extend
the life of your pump or pump system.
Check pump for leaks at least once a week.
Check the regulating and monitoring devices of
any sealing, flushing or cooling systems once a
week to ensure that they function properly.
Outgoing cooling water should be hand warm.
With double mechanical seals, monitor pressure
and flow rate in mechanical seal area; check at
least once a week.
Pumps which are exposed to corrosive chemicals
or to wear through abrasion must be inspected
periodically for corrosion or wear and tear. The
first inspection should be carried out after six
months. All further inspection intervals should be
determined on the basis of the state of the pump.

6.7 Shutting down

Close the valve in discharge pipe right before
(max. 10 seconds) switching off the motor. This
is not necessary if there is a spring-loaded check
valve.
Switch off motor (make sure it runs down quietly).
Close the valve on suction side.
Close auxiliary systems. Do not shut down
cooling system until pump has cooled down.
If there is any risk of freezing, empty pump,
cooling areas and pipes completely.
If the pump also remains under operating
conditions (pressure and temperature) when
stationary, leave all sealing, flushing and cooling
systems switched on.
The shaft sealing must remain sealed if there is a
risk of air being sucked in (in the event of supply
from vacuum systems or parallel operation with
shared suction pipe).

6.8 Storage / longer periods of non-operation

6.8.1 Storage of new pumps
If the putting into operation shall happen a longer
period after the delivery, we recommend the following
measures for the storage of the pump:
Store pump at a dry place.
Rotate pump by hand at least once a month.
6.8.2 Measures for longer putting out of operation
Pump remains installed and in ready for operation:
Test runs of 5 min. duration must be made in
regular intervals. The span between the test runs
is depending on the plant. However, it should be
made once a week, at least.
6.8.3 Longer periods of non-operation
When starting up, follow the instructions for
starting up for the first time (see chapter 6)!
Model TDB, TDV
Revision 01
Issue 06/2012