Gardner Denver RFL Series, Owner'S Manual

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RFL-7-500 Page 12
5.2 Prevention of Suction Intake of Dirt and Residue
5.2.1 Suction Pipe
The pipe must be non-corroding. Before installation it must be cleaned internally; weld debris, burn residue and rust must be
carefully removed.
The suction pipe must incline downwards from the machine to prevent condensate from entering, and a safety tank with a drain
cock must be fitted at the lowest point.
The suction pipe must be of a sufficient size. Its diameter should be at least as given in the following table, otherwise
the machine will be overloaded.
If the suction pipe is inadequately sized, warranty provided by Gardner Denver will be void.
5.2.2 Vacuum Intake Filter
The vacuum intake filter is installed directly before the machine. It protects it from contaminants and reduces suction noise.
The filter element must be removable for maintenance.
5.2.3 Safety Dome
The safety dome on the vehicle tank must include not only a float valve, but also a swell protection device to avoid liquid from
being drawn off when the liquid surges up.
5.2.4 Safety Tank
The safety tank (located at the lowest point of the suction pipe) must be constructed in such a way that:
•
incoming material does not directly flow onto the liquid surface,
•
sufficient settling room is available,
•
the filter element never dips into the liquid (even filters of non-absorbent material absorb liquid through capillary action).
The following diagram shows an optimized gravity separator. The function must be checked as follows:
When the water volume to be separated is sucked in,
•
the volume must remain in the tank,
•
in atmospheric pressure, no more than 1 litre per hour must be drawn in.
Compressor/Vacuum pump Required minimum diameter for suction pipe
RFL 102 DN100