Watson-Marlow Qdos30 Universal - Manual (Page 13)

Watson-Marlow qdos30 Universal and Universal+ Pump User Manual 13
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.
It is recommended that the pump is 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 45C (113F).
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 temperature. 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.wmpg.com/chemical
If you need to use the pump with any other chemical please
contact Watson-Marlow to confirm compatibility.