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Alfa Laval
WS 10, 20 ,30

WS 10, 20 ,30

Product catalog summary

Applications
The WS design is utilized for sludge dewatering in various industrial paint waste and surface treatment processes. It is suitable for both small and medium-capacity installations. WS decanter centrifuges are designed for efficiency, ease of installation, maintenance, and operation, with minimal costs associated with installation, operation, and service life.

Features

Fully enclosed process sections.
Critical parts made of wear-resistant material.
High performance with low energy consumption.

Benefits

Recycling of liquids.
Reduction in sludge volume, decreasing transport and disposal costs.
Continuous operation.
Compact, modular design saves space.
Low installed power reduces electricity consumption.

Working Principle
Separation occurs in a horizontal cylindrical bowl with a screw conveyor. The feed enters through a stationary inlet tube and is accelerated by an inlet distributor. Centrifugal force causes solids to sediment on the bowl wall. The conveyor moves solids towards the conical end, and the cake exits through discharge openings. Clarified liquid flows over adjustable plate dams into the casing.

Process Optimization
WS decanter centrifuges can be adjusted by varying:

Bowl speed for optimized separation G-force.
Conveying speed for balance between liquid clarity and solids dryness.
Pond depth for balance between liquid clarity and solids dryness.
Feed rate to handle a wide range of flow rates.

Design
The rotating part is mounted on a compact, in-line frame with main bearings at both ends and vibration dampers. It is enclosed in a casing with integrated outlets for solids and liquid removal.

Drive System
The bowl is driven by an electric motor and V-belt transmission. Power is transferred to the conveyor via a planetary gearbox. An optional backdrive system is available for WS 20 and WS 30 to regulate speed differences.

Materials
Components in contact with process media are made of stainless steel, with erosion-resistant materials protecting discharge ports, conveyor flights, and feed zones. The frame is mild steel with an epoxy enamel finish.

Technical Data

Model	Bowl Diameter	Bowl Length	Max Bowl Speed	Max G-force	Weight	Installed Power	Sound Pressure Level
WS 10	200 mm (7.9 in.)	709 mm (27.9 in.)	5300 rpm	3140	350 kg (772 lbs)	4 kW (5 hp)	78 dB(A)
WS 20	280 mm (11 in.)	980 mm (38.5 in.)	4400 rpm	3030	1125 kg (2495 lbs)	11 kW (15 hp)	78 dB(A)
WS 30	280 mm (11 in.)	1260 mm (49.6 in.)	4400 rpm	3030	1200 kg (2660 lbs)	11 kW (15 hp)	78 dB(A)

Dimensions
WS 10: 1500 mm (59 in.) x 580 mm (23 in.)
WS 20: 2733 mm (108 in.)
WS 30: 3013 mm (119 in.)

Contact Information
For up-to-date contact details, visit Alfa Laval's website at www.alfalaval.com.

Catalog excerpts

Applications The WS design is used for sludge dewatering in a wide range of industrial paint waste and surface treatment. Ideal for both small and medium-capacity installations WS decanter centrifuges are designed to be efficient, simple to install, easy to maintain and straightforward to operate. Installation, operating and service life costs are minimal. The WS range features • fully enclosed process sections • critical parts made of wear-resistant material • high performance combined with low energy consumption. Benefits • recycling of liquids • reduces sludge volume, which cuts down on transport and disposal costs • continuous operation • compact, modular design saves space • low installed power reduces electricity consumption. Working principle Separation takes place in a horizontal cylindrical bowl equipped with a screw conveyor (see drawing on page two). The feed enters the bowl through a stationary inlet tube and is accelerated smoothly by an inlet distributor. The centrifugal force that stems from the rotation then causes sedimentation of the solids on the wall of the bowl. The conveyor rotates in the same direction as the bowl, but at a different speed, thus moving the solids towards the conical end of the bowl. The cake leaves the bowl through the solids discharge openings into the casing. Separation takes place throughout the entire length of the cylindrical part of the bowl, and the clarified liquid leaves the bowl by flowing over adjustable plate dams into the casing. WS 10, 20, 30 High-performance decanter

Open the catalog to page 1

Process optimization WS decanter centrifuges can be adjusted to suit specific requirements by varying the • bowl speed to obtain the required G-force for optimized separation • conveying speed for optimized balance between liquid clarity and solids dryness • pond depth in the bowl for optimized balance between liquid clarity and solids dryness • feed rate – WS decanter centrifuges are designed to handle a wide range of flow rates. Design The rotating part of these decanter centrifuges is mounted on a compact, in-line frame, with main bearings at both ends. Vibration dampers are placed under the...

Open the catalog to page 2

A Technical data WS 10 WS 20 WS 30 Bowl diameter 200 mm (7.9 in.) 280 mm (11 in.) 280 mm (11 in.) Bowl length 709 mm (27.9 in.) 980 mm (38.5 in.) 1260 mm (49.6 in.) Bowl speed max. 5300 rpm 4400 rpm 4400 rpm G-force max. 3140 3030 3030 Weight 350 kg (772 lbs) 1125 kg (2495 lbs) 1200 kg (2660 lbs) Installed power 4 kW (5 hp) 11 kW (15 hp) 11 kW (15 hp) Sound pressure level* 78 dB(A) re. 20 ìPa 78 dB(A) re. 20 ìPa 78 dB(A) re. 20 ìPa * Declared A-weighted emission sound pressure level in free field over a reflecting plane at 1 metre (39.4 inches) distance from the decanter operating at maximum...

Open the catalog to page 3

EFU00029EN 0609 Alfa Laval reserves the right to change specifications without prior notification. ALFA LAVAL is a trademark registered and owned by Alfa Laval Corporate AB. How to contact Alfa Laval Up-to-date Alfa Laval contact details for all countries are always available on our website at www.alfalaval.com

Open the catalog to page 4

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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