CDR offers safe magnetic drive pumps for unloading
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CDR Pumps (UK) product story
Edited by the Engineeringtalk editorial team
Oct 29, 2008
It is becoming more common to move chemicals and acids by ship, lorry and in intermediate bulk containers (IBCs).
Legislation and the re-classification of liquids under the ADR and IMDG regulations mean industry would rather unload road tankers by pumped discharge instead of by blowing (pressurising the supply vessel, with the differential pressure emptying the tank to storage tank).
CDR Pumps' Runsafe bearings allow magnetic drive pumps to safely run dry for long periods, making them suitable for unloading tankers.
This method is cheaper as vapour can be safely returned to the tanker, eliminating the need for costly fume scrubbers.
Lined pump units are more commonly being used, whether that is those containing polypropylene for general chemicals or ETFE for solvent-based liquids and other more corrosive products.
Both are available on the CDR Pumps type ETN-L and UTN-BL.
Pumps have three major problems in such an application, priming of the pump prior to start up, dry-running of the pump unit when the tanker becomes empty and nozzle loads and forces.
Priming is simply a case of installation, plant layout and operational procedure to ensure that once the tanker is connected, the system can be primed up to the pump impeller and vented to fume scrubber or other vapour cleaning device.
CDR Pumps offers magnetic drive self priming pumps if installation is difficult.
Non-metallic pumps eliminate the problem of eddy currents, as they don't generate heat in the product.
Modern bearing material coupled with impeller and magnetic coupling design allows dry running of magnetic drive pumps.
However, this causes the pump's bearings to suffer excessive wear.
A modern pump protection device can control the pump to automatically stop once the tanker becomes empty.
The general trend is to use flexible pipework from the road tanker to the pump, often by cam-lock style fittings.
With the regular movement of pipework as tankers arrive and depart, the robustness of a lined pump is strong enough to withstand hydraulic and mechanical forces.
CDR Pumps uses the ETN-L series of lined pumps and ETS series of stainless steel pumps for such applications.
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