7 - B.6.20.44-B
F22.060.03, issued on 01.98
FLUID SUCTION SYSTEM
The suction connection of MERKUR 2000 reciprocating pumps is constructed in such a way
that both a swivel unit (angular or T-shaped) and a connector or suction pipe can be screwed
in.
The connection units
1 and 2 are used for connecting the suction system, the suction line
and the suction cup. The connector
3 is only used for retrofitting. The end of the thread is 4
situated at the suction pipes.
Most of the reciprocating pumps are equipped with the
connection unit
1 and a suction system (suction hose,
tube and suction sieve).
The swivel connector enhances the flexibility of the
suction hose so an almost empty fluid container will not
be turned over by the recoil force of the suction hose.
The diameter of the suction line is dimensioned in such a way that fluids with a kinematic
viscosity of up to 750 mm
2
/s (cSt) can be sucked without difficulty by the reciprocating pump.
A higher viscosity rating can result in a reduction of suction performance, or even result in
interrupted suction, which can be identified by an increasing pressure drop during the change
of direction (pulsating pressure).
- Measures for improvement are:
keeping the suction line as short as possible or a short suction hose with a larger cross
diameter.
Specifications of suction assembly:
Electrically conductive, maximum permissible resistance 3 x 10
4
Ω/m (tested to ISO 8031)
and leakage resistance to earth < 10
6
Ω.
(Suitable for use in hazardous locations.)
Suction
Connector 1
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