Watson-Marlow 624Di - Manual (Page 12)

Watson-Marlow Bredel E-Manuals
http://www.watson-marlow.it/pdfs-global/m-624Di-gb-01.htm[10/07/2012 13:59:15]
620RE, 620RE4 and 620R Key safety information
Before opening the pumphead guard please ensure that the
following safety directions are followed.
For close-coupled drives, ensure that the pump is isolated from mains voltage.
Ensure that there is no pressure in the pipeline.
If a tube failure has occurred, ensure that any product in the pumphead has been
allowed to drain through the controlled waste to a suitable drain.
Ensure that protective clothing and eye protection are worn if hazardous products
are being pumped.
620RE, 620RE4 and 620R Safe-guarding
Primary safety on 620 series pumps is provided by the tool-lockable pumphead
guard. On electrically-powered cased 600 series pumps, secondary (backup)
protection is provided in the form of an electrical interlock which stops the pump if
the pumphead guard is opened (and only for so long as the guard is opened). The
electrical interlock on cased pumps should never be used as primary protection.
Always disconnect the mains power supply to the pump before opening the
pumphead guard.
Only primary protection through the tool-lockable guard is provided on pneumatically
powered 620 series cased pumps. Only primary protection through the tool lockable
pumphead guard is provided on 620 series pumps fitted with industrial AC motors,
but an interface kit to allow mains power to be switched by the pumphead guard
interlock is available as an extra-cost option.
620RE, 620RE4 and 620R Pumping conditions
Pressure and viscosity
All pressure values in this operating instruction, from which performance and life
figures have been calculated relate to peak pipeline pressures.
Although rated to 4 bar working pressure, this pump will generate in excess of 4 bar
working pressure if pipeline restrictions are in place. In instances where it is critical
that a working pressure of 4 bar is not exceeded, pressure relief valves should be
installed in the pipeline.
For pumping duties of 2-4 bar pressure, only close coupled pumps should be used,
fitted with 73 Shore hardness Marprene/Bioprene or standard STA-PURE tube
elements. "M" in the tube element’s product order code denotes suitability for high
pressure use.
When pumping duties of 0-2 bar pressure, use close coupled or cased pumps fitted
with 64 Shore hardness elements or the standard range of continuous peristaltic
pump tubing.
Viscosity handling is maximised by using 73 Shore hardness Marprene/Bioprene or
STA-PURE tube elements in the pumphead.
Ensure that there is always a minimum of one metre of smooth bore flexible tubing
connected to the discharge port of the pumphead. This will help minimise any
impulse losses and pulsation in the pipeline. This is especially important with viscous
fluids and rigid pipework.
620RE, 620RE4 and 620R Pump installation
A correctly engineered installation will promote the best possible tube life, so please ensure
that the following guidelines are followed:
Avoid tight pipeline bends, pipe reducers and excessive lengths of smaller bore
tubing than that in the pumphead, particularly in pipelines on the suction side.
Ensure that connecting pipe work and fittings are suitably rated to handle the
predicted pipeline pressure.
If rigid pipe work comes in close proximity to the pumphead, a drop out section of
pipe work will simplify tube replacement.
Ensure that the controlled waste blanking plug is in position if the controlled waste
port is not in use. See below.