27 - Installation requirements -
INSTALLATION REQUIREMENTS
To ensure trouble free operation some basic rules need to be applied to the installation
of the pumps.
6.1 PUMP ARRANGEMENT
The installation must be designed as compact as possible below the separator or
low-pressure receiver. Allow sufficient access space around the pumps for removing
or replacing the pump, servicing valves, setting pressure difference control,
inspection and cleaning the conical strainer. Also allow space for normal frost/ice
accumulation around the pump.
Vertical distance between bottom of the separator to the pump centre shall be at
least 1 m. Greater distance will make the pump less sensitive to system pressure
fluctuations.
The pump shall be aligned vertically on channel frame supports.
Please consider that
a condensate trip tray can easily be placed and cleaned.
the conical suction line filter can be cleaned easily.
stress in the piping system is avoided.
6.2 PUMP CONNECTION
The top connection of the suction line to the separator can be made with a down pipe with
vortex breaker.
The vortext breaker shall consist of crossed plates with a baffle plate on top to avoid any vor-
texing. Vortex breakers are available from TH. WITT.
Above the baffle plate of the vortex breaker there should be at least 15mm refrigerant level (in
CO
2
systems a minimum coverage of 50mm is required).
When using non-soluble oils in ammonia systems special attention must be
taken that any oil, which may settle, does not drain into the duty or stand-by
pump.
Therefore, it is recommended that the suction downleg protrude into the surge drum by 30 -
40 mm, depending on the vessel diameter (see fig. 6).
A standard short oil drainage dome is not suitable for connecting a pump suction down leg.
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