Leak-proof, reliable and enduring
Process pumps which are used in refineries and chemical plants very often have to satisfy the highest demands for sealing. Sulzer Pumps has therefore extended its process pump series OHH with two hermetically sealed types, one with magnetic coupling (OHM) and the other with a canned motor (OHC). With these models, fluid transportation or delivery duties can be mastered in even the most difficult environment.Type OHC: with canned motor
For increasingly higher demands on sealing and security - i.e. when the secondary containment system is not allowed to have rotating seals - Sulzer offers the type OHC, also compliant with API standard 685, 1st edition. The OHC is a canned motor pump, manufactured in close cooperation with Hermetic-Pumpen GmbH, Germany, a long-standing partner of Sulzer Pumps (since 1994) and industry specialist in sealless centrifugal pumps.
The OHC pump overcomes also the most difficult and demanding pumping duties, for example:
Benefits of the OHC
Since the motor is separate, it can be replaced without disturbing the pump. The pump can also be repaired without moving the motor. Repair work requires caution but does not require specialists.
The OHC pump excels by having a motor casing that works as a safety containment without any moving seal. Moreover, it is very quiet and has no exterior roller bearings on the pump and motor. Its space requirement is smaller than the OHM since there is no need for a flexible coupling: Pump and motor are mounted on the same shaft.Comparison between OHM and OHC
In some cases, the OHM pump may be higher in efficiency than the OHC. Common for both types is that Net Positive Suction Head (NPSH) is uninfluenced by the waste heat from the drive. This is the case with the OHM thanks to a special circulation system (without cooling); and in the OHC thanks to an optional cooled circulation system with secondary impeller.
As all three types are based on a modular system, the main hydraulic components are common and useable across the product family. Furthermore, it is possible to rebuild one configuration into another if required to accommodate application changes.
OHC Applications
Type OHC: with canned motor
For increasingly higher demands on sealing and security - i.e. when the secondary containment system is not allowed to have rotating seals - Sulzer offers the type OHC, also compliant with API standard 685, 1st edition. The OHC is a canned motor pump, manufactured in close cooperation with Hermetic-Pumpen GmbH, Germany, a long-standing partner of Sulzer Pumps (since 1994) and industry specialist in sealless centrifugal pumps.
The OHC pump overcomes also the most difficult and demanding pumping duties, for example:
- Poisonous, corrosive, and explosive fluids such as hydrofluoric acid, acrylic acid, or even gasoline
- Very cold and very hot liquids (-120 °C/-185 °F to +425 °C/+800 °F)
- Highly radioactive rated fluids
- Fluids with very low viscosity and high vapour pressure
- High-pressure circulation of liquid phase or supercritical gases
Benefits of the OHC
Since the motor is separate, it can be replaced without disturbing the pump. The pump can also be repaired without moving the motor. Repair work requires caution but does not require specialists.
The OHC pump excels by having a motor casing that works as a safety containment without any moving seal. Moreover, it is very quiet and has no exterior roller bearings on the pump and motor. Its space requirement is smaller than the OHM since there is no need for a flexible coupling: Pump and motor are mounted on the same shaft.
Comparison between OHM and OHC
In some cases, the OHM pump may be higher in efficiency than the OHC. Common for both types is that Net Positive Suction Head (NPSH) is uninfluenced by the waste heat from the drive. This is the case with the OHM thanks to a special circulation system (without cooling); and in the OHC thanks to an optional cooled circulation system with secondary impeller.
As all three types are based on a modular system, the main hydraulic components are common and useable across the product family. Furthermore, it is possible to rebuild one configuration into another if required to accommodate application changes.
OHC Applications
- Aromatics
- Phosgene
- Carbon Dioxide Loading
- Ethane Loading
- LPG transfer or booster
- Dowtherm circulation
- Freon/134A refrigerant transfer
- Cryogenics
- Deethanizer reflux
- Demethanizer reflux
- Amine, Acids, Caustic, Sulphur
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