SCM Series
- Overview
- Features & Benefits
- Specifications
- Other Info
Overview
The Dickow SCM Series are self-priming, horizontal, side-channel pumps with end suction and vertical discharge flanges. The side-channel pump with its high differential head (achieved at low speed) has the advantage of operating more economically than standard centrifugal pumps for low capacities and high heads.
SCM Series pumps are suitable for handling clean liquids without solids in chemical and petrochemical industries. The pumps are also able to prime empty suction lines after initial filling with liquid. The static containment shell forms a closed system replacing double acting mechanical seals, along with external fluid reservoirs and the necessary control equipment.
The maximum operating temperature for standard designs is 180°C. The maximum operating pressure is 40 bar.
The single elements of the multipolar magnet coupling are manufactured of Cobalt-Samarium with unlimited lifetime. The magnets in the driven rotor are completely encapsulated and not in contact with liquid. Power is transmitted to the hermetically sealed liquid end by a bank of external magnets. Inner and outer magnet rings are locked together by magnet forces and work as a synchronous coupling.
To achieve low NPSH-conditions, the impeller on the suction side has an enlarged eye area. The rotating star-shaped side-channel impellers are fitted in a chamber between the suction and pressure disk and keyed to the pump shaft in floating position. No hydraulic thrust load exists.
To achieve the self-priming capability, high efficiency and rated differential pressure, there are tight clearances between the rotating impeller and the stationary disks. During priming, a stable fluid film between the impellers and the disks centres the impeller in the chamber. In applications where prolonged dry-running can be a problem, or when handling volatile liquids with low viscosities, the pumps can be fitted with additional SiC-rings to avoid contact between the rotating and stationary parts.
The drive shaft is carried in antifriction bearings, grease filled for life and protected against environment by radial seal ring. These bearings are rated for in excess of 3 years. Versions are also available with an oil-lubricated bearing bracket and close-coupled design.
The internal bearings are of the sleeve type, positioned in the pumped liquid. Standard material for shaft sleeves and thrust bearings is pure Silicon Carbide, highly resistant against corrosion and wear. Standard material for the stationary bearings is carbon, but Silicon Carbide is also available on request.
When coupled with Ex-drive motors, the pumps can be applied in hazardous area Group II, Category 2. The pumps meet the basic safety and health requirements of Explosionproof Directive 94/9 EC and are suitable for plants with increased safety requirements.
