Desmi VAC-4001, Operation And Maintenance Instructions, Page: 11 / 15

DESMI PUMPING TECHNOLOGY A/S
-11-
Tagholm 1
9400 Nørresundby - Denmark
Tel.: +45 96 32 81 11
Fax +45 98 17 54 99
E-mail:
desmi@desmi.com www.desmi.com
11. INSPECTION AND MAINTENANCE
Inspect the shaft seal for leaks at regular intervals.
This is done by checking the oil inside the bearing bracket. If the shaft seal is leaking the oil
becomes white.
- Before inspection of a pump without guard check that the pump 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 that has been pumped as well as the
safety measures he is to take when handling the liquid.
11.1
DRAINING THE PUMP
When the piping system has been drained, note that there is still liquid in the pump. Remove the
liquid by dismantling the drain bolt (32) at the bottom of the pump.
11.2
BEARINGS
The pump is equipped with deep groove ball bearings with a nominal life of 25,000 working hours
when direct coupled to electric motor, whereas the nominal life with overhanging V-belt drive is
about 10,000 working hours. The bearings are oil lubricated and they only require that the oil level
in the bearing bracket is correct. However, they should be replaced in case of noise or bearing
wear. In connection with a leaking shaft seal where water has penetrated the bearings, inspect
these for damages and replace is necessary.
12. REPAIRS
12.1
ORDERING SPARE PARTS
When ordering spare parts please always state pump type and pump no. (available from the name
plate of the pump). See also spare parts drawing with item nos.
13. OPERATING DATA
The following working pressures are allowed
PUMP VAC-4001
Pressure [mWC] 35
(10.2 mWC = 1 bar)
The above-mentioned max. working pressure is
NOT valid for pumps approved by a classification
society. Pumps approved by classification societies have been pressure tested according to the
requirements of these societies, i.e. a test pressure of 1.5 x the permissible working pressure. The
test pressure is stated in the test certificate and stamped into the discharge flange of the pump.