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:
When dimensioning the V-belt pulley it is important to follow the rules of the DESMI nomograms for
the pump size in question - contact DESMI.
Be careful when fitting the suction line to the pump so that it is absolutely tight, as even small
leakages may impede the priming. When pumping polluted liquids a strainer is necessary. The
strainer must be equipped with a sieve, the passage area of which is to be 3 x the area of the
suction pipe. The mesh size is to be 1-3 mm smaller than the impeller gap of the pump in question.
In order to secure priming of the pump the pressure pipe is to be arranged so that water locks in the
pipe are avoided.
If the pump is to be driven by a motor via a flexible coupling, motor and pump are to be placed on a
common base plate. The following should be observed:
- Avoid distortion of the base plate.
- Avoid distortion in the piping system.
- Check that pump and motor are aligned correctly.
Two proposals for alignment are indicated above. The deviations mentioned cover a complete
revolution of the coupling. The distance between the coupling halves is to be between 2 and
4 mm.
At installations pumping hot or very cold liquids, the operator must be aware that it is
dangerous to touch the pump surface, and, consequently, he must take the necessary
safety measures.
