Dryden Engineering

The Dryden Engineering Company (Pty) Ltd.

The Dryden Engineering Company (Pty) Ltd. has been supplying Mining Machinery, Filter Presses, Filter Cloth and Filter Paper, Fans, Boilers and Compressors to the Gold, Coal and Diamond Mining industries since 1925, and later to other industries including the railways, steelworks and fishing.

Pumps, Atritor Pulverisers and Driers, Mixers, Extruders, Cranes, Deck Machinery, Fishing Net Control, P.F. Fired Furnaces, etc.

Listed below are more comprehensive details of these products.

FILTER PRESS RANGE Johnson-Progress design, supply, manufacture, install and commission a complete range of Filter Presses for liquid and solid separation. These cover the complete range from 250mm square, small manual models up to 2000mm square fully mechanised industrial units. Alternatively special purpose presses can be designed in line with customers specific requirements. The model 250 press is particularly suited to manufacturers and research workers who often require presses of small capacity to equate performances for large commercial installations. Models 470 up to 800 presses are widely used by manufacturers and processors over the entire spectrum of industry. Designs are available in all sizes in both recessed and plate and frame forms.
Manually operated recessed filter press. 250mm square with integral feed pump.	Manually operated hydraulically closed recessed filter press. 470mm square.

MECHANISED PRESSES

Mechanised Presses can be supplied in both sidebar and overhead form and incorporate features such as:
• Double acting hydraulic opening and closing
• Hydraulically operated hinged drainage trays
• Plate movement system
• Photo electric light guards
• Cloth washing
Mechanical Plate Movement
Mechanisation of the filter press invariably includes our plate movement system which is infinitely variable for use on our sidebar or overhead design and also fully adjustable to accommodate polypropylene or cast iron plates. A unique feature of our system is the hold back facility so that only one plate at a time is transferred with a positive stacking when deposited.

Mechanised sidebar press featuring plate movement system (featured below), double acting electro hydraulic opening/closing, hydraulically operated hinged drainage trays and photo electric light guards.

FILTER CLOTHS

Natural Fibres
Cotton was once the main fibre selected and is still used when conditions permit. They make a good joint between the plates and are obtainable in a wide variety of weaves, weights and counts.
Cotton
(An optimum working temperature of 100°C (dry heat) is suggested but many users obtain satisfactory service at even higher temperatures).

Cotton cloths are suitable for most materials, such as aqueous, spiritous, oils, fats, waxes, etc., where there is no appreciable acidity or caustic alkalinity. They can, however, be attacked by mildew when left wet and unused. They can also be attacked in some special circumstances where other spore organisms are prevalent, although in most cases precautions can be taken to obviate infection.

Johnson-Progress are able to supply cotton cloths in a wide variety of weaves such as plain, twill and broken twill and a range of weights from 1-24 ozs. per square yard, in various counts. This range is designed to cover every possible requirement.

FILTER PAPERS
These can be supplied in many special grades of crepe or plain, normal or wet strength. When used on filter presses they are usually supported by a cloth and in many cases, where no cake is formed, their function is to protect the cloth and obviate the necessity for removing the cloths and washing the deposits from them. The papers are usually changed after each pressing.

Blotter papers for the filtration of trans-former oils, etc., are not used in association with cloths but generally as pads of three or four papers for each face of the press. Papers in general give finer filtration without filter aids than cloths but in some cases will restrict flow. Filter pads and mats are supplied in various porosities and sizes. They are cut and punched to suit filter presses and sterilizing filters. Laboratory filter papers are supplied in a range of qualities and diameters, specialist papers being made up for particular requirements.

FCE MATERIALS HANDLING LTD - INCORPORATING TAYLOR STILES

Reel Splitter	Wire Winder
Reel Splitter	Guillotine

Robust guillotine type reel splitters designed to produce maximum efficiency with minimum effort. Will cut through rolls of paper, board and tissue up to 2.5m diameter by 3.5m wide. Designed for minimum maintenance.

Horizontal and inclined screw presses for de-watering of fibrous products and separation of fluids from solids. Used in paper making, food processing, brewing and distilling. Also used in effluent plants and water reclamation.

Equipment designed to meet specific cutting and size reduction requirements such as shredding, crushing, dicing, pelletising, granulating and guillotining.

Design, manufacture and installation of mechanical handling equipment, conveyor systems, lifting gear, turn tables, chutes, welding manipulators and drum handling devices.

Wire Winder - bales scrap wires into compact rolls for efficient handling and disposal. Also available are a series of choppers that cut scrap into small pieces and bag for disposal. Separation systems can be provided for power transmission and multi strand cables. Separating various materials in preparation for re-cycling.

USF – EDWARDS & JONES

PUMPS

Specifically designed for the arduous duty of pumping ceramic slip, the "Willett" positive displacement vertical ram pump has a long and distinguished history in this industry. This sturdy unit is used in 1,000’s of installations throughout the World on transfer duties, filter press feed and for feeding casting slip ring mains.

The pump’s hydraulic power pack gives automatic flow control when feeding filter presses and fixed flow when feeding casting slip ring mains. The hydraulic drive ensures minimum power usage regardless of flow or pressure.

Inlet/outlet valves can be the gravity seal ball type or the spring loaded "Stalk" design. Ball valves are usually polyurethane covered cast iron with solid polyurethane seats. Stalk valves can be offered with nylon coated and stainless steel components.

For applications where it is essential to avoid contamination fully lined pumps are available.

Blungers, Mixers & Agitators

HIGH SPEED

First patented by Edwards & Jones, this unit revolutionised clay blunging. Ball and China Clay, Sanitary Ware Casting Slip, Floor and Wall Tile Body and Returned Scrap can be blunged in 20 minutes - at least 7 times faster than more conventional methods.

Blunging and Dispersion is achieved by a unique Rotor and Stator. The drive unit, mounted on a substantial cast iron crossrail, consists of a specially designed heavy-duty top steady housing, vertically mounted motor and vee rope drive, to give a shaft speed of 650 r.p.m.

The Blunger assembly is usually mounted on an octagonal or hexagonal tank, but can be supplied ready for fixing to your existing tank. As one High Speed Blunger is capable of replacing several conventional type Blungers, substantial savings can be made in time, energy, space, capital cost and labour.

MEDIUM SPEED

For the Blunging & Mixing of various types of Ceramic Bodies particularly those having a High Pint Weight/Specific Gravity and where it is necessary to avoid particle size reduction.

The blunger shaft, which rotates at 200 r.p.m., has horizontal arms fitted with vertical shear end plates which can be adjusted to suit different bodies.

The machine is extremely efficient for the direct preparation of Sanitary Ware Bodies, Casting Slip and Tableware Bodies, etc.

SLOW SPEED

The Edwards & Jones Conventional Blunger has proved its versatility, reliability and efficiency in the blunging and dispersion of all types of Lump, Ball and China Clays, Refractory Clays, Press Cakes, Casting Slips and Return Scraps etc.

It consists of a fabricated centre dolly fitted with replaceable mild steel arms and knives and is driven via a worm reduction gear box.

AGITATORS

Usually of the paddle or gate type - the most suitable design for keeping in suspension small particle solids up to relatively high concentrations.

They are simple in design, inexpensive to run and can be supplied in sizes ranging from 914mm x 914mm up to 4267mm x 4267mm. Drive is provided by a worm and wheel gear box which is designed specifically for this type of agitator.

MARELEC - Intelligent Fishing Systems

Maximal fishing efficiency with automatic winch and propeller pitch control.

MAXIMUM NET OPENING
Maximum catch obtained under all working conditions through equal tension control in both wires and consequent length difference.
Fishing applications:
- with transverse winds and currents.
- on inclined sea bottoms.
- with adverse weather conditions.

FISHING GEAR PROTECTION
Fishing-gear & time, repair saver.
In case of a fastener, a warp-overload is anticipated through automatic shooting of the wires.
Propeller pitch reduction if a fastener persists.
The effect of fasteners is reduced drastically, especially on difficult grounds.

FAST TURNING
e.g. 2000 HP vessel - 800m warp out.
Turn time 180°: 5 min – length difference: ±80m.
Fishing time gain, through fast turning with the ship up to 180°
Without haul-in of the fishing gear.
Fishing applications:
- Target fishing
- Fishing following curved or parallel tracks.

SHOOTING - HAULING
Time saving through synchronised pay out and haul in of the warps towards preset lengths at optimal speed.
Labour saving: no more remarking the warps and mark counting.

THANK YOU FOR VISITING OUR WEB SITE

THE DRYDEN ENGINEERING COMPANY (PTY) LTD
P.O. BOX 62510
MARSHALLTOWN
2107
SOUTH AFRICA

TELEPHONE NUMBER: + 27 11 493-5566
FACSIMILE NUMBER: + 27 11 493-2819
E-MAIL ADDRESS: drydeneng@dryden.co.za