Canned motor pumps of HERMETIC
How canned motor pumps work
HERMETIC canned motor pumps meet the highest safety requirements thanks to their design with a double safety shell. Hydraulics and motor are not separated – both form one unit. This means that no added couplings or seals are required. Canned motor pumps are therefore leak-free.
The impeller, or impellers in the case of multi-stage pumps, are attached directly to a hollow shaft. The hollow shaft on two plain bearings is submerged in the liquid or the conveying medium that dissipates the heat from the motor and lubricates the plain bearings. The motor consists of a rotor and a stator. The rotor is directly connected to the hollow shaft. As a result, the hollow shaft and the impellers rotate automatically as soon as the rotor starts turning. The stator lies outside the liquid area and is separated from the rotor by a so-called rotor lining.
Benefits: safe, compact and reliable – HERMETIC canned motor pumps
SAFETY – ENVIRONMENTAL SAFETY WHEN USING NATURAL REFRIGERANTS
The second safety shell protects people and the environment. The second safety shell, pressure-tested at up to 52 bar, cannot come into contact with rotating parts. This eliminates any possibility of emissions and the escaping of toxic or explosive fluids.
RELIABILITY – MEAN TIME BETWEEN FAILURES
Canned motor pumps have the best MTBF (Mean Time Between Failures) values compared to other pump technologies. If the pump is running at the duty point, there is no contact between rotating parts. This is achieved through the HERMETIC ZART® design. A design with axial and radial thrust balance.
COMPACT – SMALL INSTALLATION SPACE
With HERMETIC, there is no physical separation between the motor and pump. This makes the pump more compact than conventional centrifugal pumps. You save about 50 % in installation space.
NOISE EMISSION – REDUCED NOISE LEVEL
No external motor cooling and external rotating parts that generate vibration and noise. A pump that does its job quietly and reliably.
COSTS – LOWEST LIFE CYCLE COSTS
The typical life cycle costs of an industrial pump include the initial costs (procurement) as well as the maintenance and energy costs. Approximately one-third of life cycle costs are maintenance, installation and downtime costs. You can drastically reduce these costs by using HERMETIC pumps.
Thanks to the high MTBF of 8 to 12 years, canned motor pumps are the most economical solution, especially in the long term.
FAILURE RATE – HERMETICALLY SEALED DESIGN
Defective seals cause 64 % of all system failures. Canned motor pumps help you eliminate these faults.