DWS 250 C

Atlas Copco DWS 250 C – dry screw pump for the process industry

The DWS 250 C delivers 250 m³/h and reaches an ultimate pressure of 0.05 mbar(a); the outlet pressure may be up to 1.2 bar(a). Motor 7.5 kW at 2950 rpm, sound pressure level at most 72 dB(A), dimensions 872 × 502 × 470 mm (L × W × H), weight 326 kg, inlet DN 65.

Built for liquid and particles

Variable pitch and an optimised rotor profile ensure high efficiency and short pump-down times, even when the process carries over liquid or particles. The wetted parts are Hastelloy C coated as standard; for particularly corrosive processes, further coatings and duplex stainless steel are available. For more pumping speed and a lower ultimate pressure the pump can be combined with a Roots pump.

Applications of the range

Atlas Copco lists the chemical, petrochemical and pharmaceutical industries – for example distillation, evaporation, solvent and exhaust gas recovery, reaction vacuum, sterilisation, adsorption and desorption, crystallisation, deodorisation, impregnation, pervaporation, polymerisation, vacuum drying, pneumatic conveying and the conveying of corrosive gases – as well as composites and rubber, freeze drying and CO₂ capture.

Version

Atlas Copco configures the DWS C pumps to the customer's process requirements – there is therefore no fixed part number. Ehrler & Beck clarifies materials, sealing, cooling and accessories with you and requests the appropriate quotation.

Features of the DWS C range

• Screws with variable pitch and optimised rotor profile: high efficiency and short pump-down times
• Tolerates liquid and particle carry-over from the process
• Wetted parts made of grey cast iron with Hastelloy C coating; other coatings and duplex stainless steel as an option
• Cooling jacket on the housing as standard, shaft cooling for a lower operating temperature
• Specially designed mechanical seal against oil leakage, PTFE lip seal as an option
• Precision-manufactured for low vibration and a low risk of seizure
• Clean-in-place and gas dilution module available for polymerisation and temperature-sensitive processes

Pumping speed 50Hz	250
Ultimate pressure	0.05
Rated motor power 50Hz	7.5
Weight	326
Length	87.2
Width	50.2
Height	47
Inlet connection flange	DN 65
Noise level	72 dB(A)
Cooling method	Water cooling

Additional technical data