DESMI Pumping Technology A/S
10
Tagholm 1
9400 Nørresundby
– Dänemark
Tlf. nr.: +45 96 32 81 11
Fax +45 98 17 54 99
E-mail: [email protected]
S32-25-110N:
Place the gasket (21) between pump casing and bearing housing on the bearing housing. Check that
the non-return flap is placed correctly in the pump casing. Lead the bearing housing into place and
fasten. Note that the drain passage for the shaft seal faces downwards.
S50-32-135N:
Place the gasket (21) between pump casing and bearing housing on the bearing housing. Lead the
bearing housing into place and fasten. Note that the drain passage for the shaft seal faces downwards.
If the shaft cannot rotate freely, dismantle the bearing housing again, and place an extra gasket (21)
between bearing housing and pump casing.
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 in the inlet cover to empty the pump. Alternatively, it is possible to use anti-freeze
liquids in normal constructions.
8. 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.
If the pump has been pumping cold or very hot liquids, be aware that touching the pump
surface is dangerous. Therefore, the necessary precautionary measures must be taken.
9. START-UP
A self-priming centrifugal pump will not function until the pump casing has been filled
with liquid.
The liquid also serves as coolant for the shaft seal. In order to protect the shaft seal the
pump must not run dry.
WARNING
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 preset 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
11.
9.1 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.