Dustair Ltd

For many years Dustair Limited has been manufacturing a full range of cyclones from low through to medium up to high efficiency in either single or multiple form for various applications. Commonly nowadays cyclones are used only as pre-filters before filtration equipment in order to reduce loadings, however on some applications cyclone may be suitable as a stand-alone unit. See selection guide for cyclone sizings.

Dustair are able to provide any form or size of duct system manufactured in varying grades or forms of materials. This includes flanged, slip jointed and clip together ductwork systems from plastics, galvanised, mild and stainless steel from 1mm up to and beyond 6mm thick. Construction can be in the form of lockformed or welded construction.

MODULAR SIZING

The size 50 - 1100 range of envelope filters is designed to cater for the most common dust problems, which usually involve a ducted system. Larger systems utilise a number of units in a modular form, or other types of filter from our range.

To cater for the wide range of air volumes encountered in ducted systems we can offer a variety of fan options. The units can be supplied without fans for multiple banking fan applications. Our engineers are at hand to select the correct fan for your particular requirement.

As well as providing metal fabricated equipment, including filters and extraction systems we are able to provide a similar range of equipment manufactured in various plastic, corrosion resistant materials. These can all be made suitable for applications in chemicals, pharmaceuticals and waste treatment industries in various materials to suit the requirements.

This includes manufacture in PVC, polypropylene and glass reinforced materials, together with a combination of surface treatments of metal fabricated components to suit corrosive environments. The full range of equipment including fans, ductwork, scrubber units, exhaust hoods and tanks can be provided for various process systems ranging from basic fume control in corrosive environments up to exhaust from complete process lines involving acid, alkaline and rinsing systems.

For over 18 years Dustair Limited have been supplying various exhaust systems and equipment for extracting from both aluminium and steel rolling mills throughout the world.

These have been a combination of design only and design/supply of extraction systems exhausting volumes of between 50,000 cfm and 250,000 cfm. The equipment supplied by Dustair Limited has included complete exhaust systems, extraction hoods and enclosures and the fume arrestment equipment for the various pollutants. This has also included the supply of other technical items of equipment to be included within the exhaust systems, including fire dampers, volume control dampers, pneumatically operated switching dampers, CO2 arrestment systems and pipe work, clean down equipment and other mechanisms for the efficient functioning of the exhaust system.

The range of reverse jet filter units are designed to cater for more specialist dust that cannot be handled by the standard shaker type filter systems. Reverse jet/reverse pulse units are normally required where a constant air volume is needed without possibility of the equipment being shut off for cleaning. To achieve this maintenance of the designed air volume at pre-determined intervals a burst of compressed air is released from the reservoir on the unit inducing a shock wave and short back flow of air into the cartridges or bags. This breaks free the dust cake formed on the outer surface of the cartridge or bag, allowing this to then freely fall into the hopper at the base of the unit. This is all controlled automatically with an electrical panel mounted on the unit.

To cater for the wide variation of air volumes encountered in these types of systems we are able to offer a variety of fan options, which can be mounted either directly on the units or at floor level adjacent to the units. Alternatively, the units may be provided without fans for incorporation into either existing systems or fitting with free issue fans. Our engineers are at hand to select the correct fan for your particular requirement when necessary or at anytime for assistance.

Designed to discharge sawdust, wood shavings, paper dust and similar low density none abrasive materials from cyclones, shaker and reverse jet filters. The valve body is fabricated from sheet steel and fitted with a 6 blade rotor coupled to a geared motor. The rotor blades are hard wearing nitrile rubber or polyurethane. The valves are built to a standard design or to suit individual applications

Specialist made dampers for both volume and fire control for various exhaust systems. These can be manufactured in a variety of materials utilizing either manual or automatic control.

Actuation of fire dampers can be provided by incorporating the system either into existing fire suppressant equipment on site, or by providing pneumatic, CO2, electronic or mechanical initiation.

HEAVY DUTY DESIGN

The range of standard tube filters offers larger types of unit than our standard envelopes to suit heavier dust loadings and air volumes if required. The units are of the modular type such that large permutations of filter cloth area may be attained based on six sizes from 710 to 1995. Each of the reference numbers relate to the cloth area in square feet i.e., the size 710 contains 710 sq ft. Since the application of these units vary greatly no fans are included in their standard arrangement and these are usually selected separately according to application. Commonly they are floor mounted alongside the filter. However, alternative positions may be selected to suit your requirements.

Dustair are suppliers and distributors of standard weld fume extraction equipment, manufactured by EUROMATE, Holland. This includes multiposition extraction arms, electrostatic and mechanical filters (both mobile and fixed) and centralised filtration systems.

As a requirement of the latest COSHH legislation it is necessary that any LEV (local exhaust ventilation) equipment be thoroughly inspected and tested every fourteen months. Dustair Limited is able to provide this service including full tests and provision of documentation.

Our service includes comprehensive testing and recording service, including full and detailed documentation of the entire local exhaust ventilation equipment tested and details of any tests carried out by our service/testing engineers.

The Dustair wet arrestor is a highly efficient wet scrubber / dust collector made in sizes standard varying from 1,000 cfm to 20,000 cfm and above to suit specific applications.

Standard Hand Desludge Units

The basic operating principle is a simple and yet well proven system utilizing the negative pressure of the fan to induce a water spray through the internal scrolls of the wet collector. The result that this gives is a highly efficient water scrubbing system, but without the inherent problems of pumps, pipework or spray nozzles. This means that the unit is relatively self cleaning on many dusts and requires very little maintenance. The system is also very simply engineered to provide good facilities and access for any maintenance and cleaning arrangements that may be required. The scrubber cleans the air by driving the dust laden atmosphere into a plenum chamber, then forcing it at high velocity through narrow slots. This picks up water through heavy turbulence created at the narrow scroll orifice. Additional centrifugal force is then applied to the air path to induce constant wetting of the dust before this is finally trapped and thrown back to the clean side of the filter for settling. The efficiency of the system is maintained by a water levelling device which requires very simple setting initially and then no further modification is required.

As well as designing and supplying new equipment Dustair Limited can provide service and maintenance on either an annual contract or unit specific basis. This includes clean out and maintenance of dust control equipment as well as duct and entire system clean outs to prevent accumulation of extracted material. Maintenance of filtration unit includes re-bagging, clean down and refurbishment of dry filtration units as well as complete strip down and washing of wet/scrubbing units.

As well as providing a turnkey facility for extraction systems, including supply, delivery, installation and commissioning we can also provide design only services for various items of equipment. This is commonly provided for overseas equipment where the large volumetric sizes of the equipment for shipping may be cost prohibitive. As a consequence we are able to supply full design drawings for equipment to be manufactured overseas by more localized suppliers.