Magnetic drive pumps

Horizontal and vertical centrifugal pumps

In 2007 CDR Pompe have added a magnetic drive regenerative turbine pump to their already comprehensive range of chemical industrial pumps. The regenerative pump is often classified in the general category of centrifugal pumps, and borrow some of their operating principles, however, offer themselves to some specific duties. In a centrifugal pump, the liquid enters the impeller, which normally carries between 4 and 8 vanes, and is pushed out by centrifugal force, out of the pump discharge port having increased its pressure.In a regenerative turbine pump, the fluid enters the impeller much closer to its periphery where the first set of between 50 and 120 very small vanes gives the fluid a small push of centrifugal force, in the radial direction toward the Impeller periphery in a circular path back toward the inside diameter of the impeller vanes. Here it receives a second centrifugal push that increases the fluid velocity. This regeneration effect within the impeller therefore gives the pump its name of regenerative turbine pump.

Both sides of the Impeller carry the blades, making it hydraulically balanced, and while free floating within the casing, results in minimal contact with the stationery casing and produces minimal axial thrust, eliminating premature wear of the impeller and minimal loads on the magnetic drive bearing arrangement.
The single Impeller is capable of producing six or more times that of a conventional centrifugal pump of similar size and speed, making them an ideal choice where high pressure and low flow characteristics are required. They are also ideally suited to installations with low NPSH requirements, and can safely handle vapour content up to 20%.

The pumps are available in Stainless Steel, Polypropylene and PVDF to cover a wide variety of chemical applications. The magnetic coupling and bearing arrangement are taken from the already well proven series of pumps, making spare parts interchangeability a huge bonus for the range, while the magnetic coupling is manufactured according to a patented system that avoids the use of resins and glue. This provides a safe system with improved performance at high temperatures. Both plastic and stainless steel turbine pumps comply with Atex 100a regulations, Group II Category 2G, for use in potentially explosive atmospheres.


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Biodiesel technology
Low maintenance, pump modularity, excellent efficiency and good NPSH values make the CDR Pompe centrifugal pump range an interesting solution for the complete line of the Biodiesel Industry

Oil Prices are rising and the demand for fuels is constantly increasing.

All industrialised countries are trying to reduce their dependence on fossil fuel imports to ensure that their economic growth is based on secure supplies. One of the most important alternatives is nowadays represented by biodiesel, whose importance is constantly increasing.

Biodiesel is produced from renewable sources (mostly oil rich seeds), it does not contribute to climate changes (it generates 80% less CO2 and 50% less CO than standard fuels); it does not contain sulphur, therefore it is not dissipating highly polluting SO2 into the atmosphere.

Biodiesel can be produced starting from several edible and non-edible oil rich seeds: rape seeds, soy beans, palm and sunflower seeds, etc.
However, the first oil produced after first pressing cannot be used as such because of its high viscosity (70-80 cSt). It requires a chemical / physical process to "break" the chemical bonds of the fat molecules, reducing their viscosity down to 4-5 cSt.

This process is called "transesterification", the actual extraction of biodiesel.

A pre-treatment phase prepares the feed for the esterification. After pre-treatment the feed enters the main phase where, in the presence of methanol and a catalyst (usually NaOH), it is converted into biodiesel.

Fig. 1: The transesterification process generates glycerol as a high value sub-product (glycerol can be used in more than 800 applications!)

A subsequent wash column removes glycerol and water from the product, expelling the diesel at the front end. A reverse flow of water enters the front of the column, washing the glycerol and excess methanol out of the product stream. A further column recovers the methanol from the water-glycerol mixture, returning it to the transesterification phase for re-use.
Subsequent evaporation in another plant module purifies the crude glycerol for use in different kind of industries.

Regardless of their dimensions and capacity, biodiesel plants all have this same similar structure.

From the delivery of seed oil up to the handling of the end product, CDR centrifugal pumps offer a tailored solution to the specific needs of that particular process phase: magnetic driven centrifugal pumps for increased safety when dangerous or flammable liquids are concerned. Pumps can be in stainless steel for methanol and biodiesel or with thermoplastic lining for handling corrosive media (caustic). Whenever dirty liquids are concerned (it can be the case for vegetable oil and glycerol), the same pumps are available also with a wide selection of conventional mechanical seals.

CDR Pompe SpA
Via Togliatti, 26/a
20030 Senago (MI) Italy
VAT code 07628510153






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