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DESMI Pumping Technology A/S 5
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
5.3 SHAFT
When the pump has been assembled, check that the shaft rotates freely.
6. 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.
7. DISMANTLING
Before dismantling the pump make sure that it has stopped. Empty the pump of liquid before it
is dismantled from the piping system. If the pump has been pumping dangerous liquids you are
to be aware of this and take the necessary safety measures.
If the pump has been pumping hot liquids, take great care that it is drained before it is removed
from the piping system.
8. START-UP
A self-priming centrifugal pump will not function until the pump casing has been
filled with liquid. Remove the plug at the top of the pump casing and fill the pump
with cold liquid. Fit the plug and the pump is ready for service.
The liquid also serves as coolant for the shaft seal. Consequently, the pump
Must under no circumstances be started before it has been primed with liquid.
Furthermore, the pump must never run dry.
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 80°C for standard pumps). 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.
To protect the pump against unintentional operation it is equipped with a relief valve which opens at a
pre-set pressure.
Be careful: When the valve opens, the escaping liquid will be hot.
The relief valve must in no circumstances be removed or re-adjusted!
As regards maintenance of the relief valve - see paragraph 10.
8.1 STARTING
Before starting the pump check that
- The shaft rotates freely without jarring sounds.
- The pump casing is 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.
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