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3.7 Pump Selection
Pumps can be used to deliver higher capacities and are recommended for intermittent use only
to enable the dissipation of heat, which is generated by high speed and pressures. The actual
capacity of the pump depends upon the speed at which the rotor revolves. The pump’s speed
and consequent output achieved will depend on many factors:
• Is the medium being pumped aggressive, abrasive, viscous or shear sensitive?
• What type of use is required for the pump, all day every day or short, periodic use?
• Is the system a high or low-pressure system?
• Is the medium being pumped at a high or low temperature?
• What is the solid content - percentage of solids, shape and size of particles?
All these factors should be taken into consideration when selecting the pump size and speed of
operation. If you have any reservations, do not hesitate to contact your local VERDER
distributor, who will be more than pleased to offer professional, expert advice and
recommendations to ensure you get the optimum pump for your application
3.8 VERDERFLEX Hose
To complement the hose pump, VERDER has developed the VERDERFLEX hose for continuous
operation. Tests have shown that these hoses have significantly greater serviceable life in
comparison to materials used in competitors’ hoses, and are able to achieve a 95% vacuum
(equivalent to a suction lift of 9.5m)
