8 Good pump installation practice
8.1 General recommendations
Always consult an expert before installing a metering pump in a
specialised system. Metering pumps should be maintained by
qualified persons.
The pump must be bolted to a flat, horizontal, rigid surface, free from excessive
vibration, to ensure correct lubrication of the gearbox and correct pumphead
operation. Allow a free flow of air around the pump to ensure that heat can be
dissipated. Ensure that the ambient temperature around the pump does not exceed
45°C (113°F).
The STOP key on pumps supplied with a keypad will always stop the pump. However,
it is recommended that a suitable local emergency stop device is fitted into the mains
supply to the pump.
Do not stack pumps.
This pump is self-priming and self-sealing against backflow. No valves are required in
inlet or discharge lines, except as described below. Valves in the process flow must be
opened before the pump operates.
Users must fit a non-return valve between the pump and the
discharge pipework to avoid the sudden release of pressurised
fluid in the event of a pumphead failure. This shall be fitted
immediately after the discharge of the pump.
qdos30 is a positive displacement pump; therefore, it is
recommended best practice that customers incorporate
discharge pressure relief in their piping system. Failure to fit a
pressure release valve in the discharge pipework will result in
excessive build up of pressure should the discharge become
blocked. This may present a safety risk, may cause damage to
the system pipework or lead to premature failure of the
pumphead. The pressure relief valve shall be rated at no more
than 10 bar. It shall always be rated at below the users system
maximum operating pressure. It shall be installed so as to
provide easy access for maintenance, inspection and repair. It
shall not be capable of being adjusted without the use of a tool.
The discharge opening must be located and directed so that the
release material is not directed towards any person and will not
deposit on parts that could cause a hazard. There must not be a
shut-off valve between the overpressure safety device and the
pump.
Do not block the drain port of the ReNu pumphead.
Ensure the chemicals to be pumped are compatible with the
pumphead and the pipework and fittings to be used with the
pump. Please refer to the chemical compatibility guide which
can be found at: www.wmftg.com/chemical. If you need to use
the pump with any other chemical please contact Watson-
Marlow to confirm compatibility.
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