Desmi ESLH/-17, Operation And Maintenance Instructions, Page: 12 / 19

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DESMI Pumping Technology A/S
12
www.desmi.com
Tagholm 1
9400 Nørresundby
– Denmark
Tel: +45 96 32 81 11 Fax: +45 98 17 54 99
E-mail:
desmi@desmi.com
6.8 SHAFT
When the pump has been assembled, check that the shaft rotates freely.
7. FROST PROTECTION
Pumps which are not in operation during frost periods are to be drained to avoid frost
damage. Remove the plug at the bottom to empty the pump. Alternatively, it is possible to
use anti-freeze liquids in normal constructions.
8. DISMANTLING
When removing the pump, first make sure that the pump has stopped. The
pump is then drained of liquid before being dismantled from the piping system. If the pump
has pumped dangerous liquids, be aware of this and protect against damage. In the case of
hot liquids, care should be taken to ensure that the pump is emptied before removing the
piping system.
9. START-UP
Please make sure the pump is filled with cold , clean water(room temperature) before
first start-up and/or after pump has been drained.
ATTENTION
For safety reasons the pump is only allowed to operate against closed discharge valve
for a short time (max. 5 minutes and at a max. temperature of 180°C). Otherwise there is a
risk of damage to the pump and, at worst, of a steam explosion. If the pump is not
monitored, the installation of a safety device is recommended.
Pumping water through a passive continuous pump is not recommended as it may damage
the shaft seal due to lack of ventilation and/or too low speed due to current pressure and
temperature at the shaft seal.
Check in the electric motor manual if the bearings in the actual motor shall be lubricated with
grease before first start-up.
9.1
START-UP
Before starting the pump check that:
- the shaft rotates freely without jarring sounds.
- the pump casing, mechanical seal chamber and the suction line are filled with
liquid.
Start the pump for a moment to check the direction of rotation. If the direction is correct (i.e.
in the direction of the arrow) the pump may be started.
For the life of the shaft sealing, it is recommended that the pumps run at a speed of at least
450 rpm and that a maximum of 1 minute is spent on acceleration from 0 to 450 rpm and 1
minute deceleration from 450 to 0 rpm.