Canned motor pumps are heavy-duty centrifugal units. These pump units can be divided into two groups depending on the type of its drive and weatherproof seal:
The choice of the canned motor pumps is determined by the requirements to the unit application in a certain conditions and environments. Thus, the combination of the following factors should be considered:
Nowadays strict environmental and process safety standards have been developed leading to the increasing implementation of leak-less solutions in the pump unit production industry. These days absolutely leak-proof units are pumping radio-active, toxic, and fire-hazardous materials with no risk of leakage. In the last 30 years the useful life and level of reliability has been raised greatly, and production costs of the canned pumps have been reduced as well, thus having opened up the possibilities for their application.
Currently the integrated motor pumps have obtained wider circulation in practice, as they came into use earlier than the pumps with magnetic coupling. However the range of the ability of the latter to operate with high temperatures and pressures as well as with complex liquids has been constantly expanded. Thus, at the moment the industry is very interested specifically in applying the pumps with magnetic coupling. This is explained by the fact that such pumps possess special engineering solutions that allowed removing a number of defects typical for the integrated motor pumps.
The use of the static seal instead of dynamic one inside the sealed chamber in the pump with magnetic coupling has eliminated the problem of the shaft leakage.
The pump units with magnetic coupling are equipped with a standard electric motor which activates the shaft with a magnetic drive. The internal rotor runs by means of the magnetic field action. Between north and south poles the magnetic field is created that eliminates the sliding of the coupling.
More often the magnet inside the chamber is attached to the shaft whereas the outer magnet is placed from the outside. The latter is attached to the drive in such a way that during its rotation the magnetic forces come through the chamber casing and thus activate the inner magnet. The flux passes through the air gap and leak-less enclosure with no physical contact to the internal rotor. The insulation provides the pump system free of leakage and is produced from the rust-resistant material.
One of the most important components of this type of pumps is the containment shroud. It features high level of process liquid resistance, endurance and thermal stability and determines the maximal medium temperature and internal pressure. The material of construction of the containment shroud depends of the application (polymeric materials, ceramic or metal).
To ensure long life and fail-safe operation of the canned pump, efficient performance of cooling and lubrication system is required, especially in case of pump units with metal containment shroud.
The pump units with magnetic coupling imply adherence to operation and installation instructions, production practices and in some cases the use of integrated systems of protection and interlock.
The high price of the pumps will repay in five years in case of proper use.
The advantages of the canned motor pumps include: the ability to operate in applications dealing with dangerous and radioactive materials, gases, high-pressure steam products, as well as with low viscosity liquids.
Such pump units endure the operating contingencies (they operate at temperature range from 160 to 600 °C and pressure at 150 MPa).
This type of pumps features good heat dissipation, no axial loads, and easier transportation. The canned motor pumps are completely leak-less, long-life and reliable, they don’t have wear parts. Moreover these pumps are resistant to short-time dry running conditions and demonstrate unessential heat loss.
The canned motor pumps are widely used in the processing industry due to its capability to deal with hazardous materials. This type of pumps is also used in solar energy generation, photography industry, chemical industry, treatment of different kinds of surfaces, printed boards’ production, as well as waste water filtration.
The canned pumps with magnetic drive are widely used in petrochemical industries, having proved their special safety and irreplaceability.
Nowadays the experts say, that in future the canned pumps with magnetic coupling will be widely used in industries dealing with high-temperature and high-pressure oil products.
We are convinced that our company ENCE GmbH will become your reliable and efficient distributor (authorized representative) of your canned motor pumps in the Russian market.