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Essential considerations for ducting and dust extraction

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article image Welding fumes are a known, potentially fatal health hazard.
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INDUSTRIES which involve welding and woodworking should take a look at the latest ducting technology available in Australia.

Processes such as sanding, milling, cutting and turning yield wood dust and particles that become airborne. Welding fumes are also a known, potentially fatal health hazard.

Besides the hazards of breathing in wood dust, a large amount of particulates in the atmosphere can present a potential explosion problem, and product quality can be affected.

According to Eximo’s founder and managing director Roger Marriott, the Australian company has been investing heavily into research and developing, in order to ensure industry has access to the very latest and best ducting technology anywhere in the world.

As manufacturing techniques and materials advance, Eximo works to ensure it has the exact waste disposal system to meet any specific requirements.

In Australia, the two that most common varieties of ducting are flexible ducting and modular ducting. Flexible ducting is usually made from various grades and weights of PVC, Polyurethane or rubber- the higher the grade and weight, the tougher the flexible ducting.

Modular steel ducting, such as the Eximo SpeedLock range, is manufactured using smooth bore technology, to minimise the risk of wood waste settlement and system clogging.

For applications where some clogging is unavoidable, the system provides easy access for cleaning and maintenance.

To help keep the workplace free of toxic welding fumes, Eximo has a number of proven solutions, one of which is a flexible ducting product called WeldFlex - a lightweight PVC ducting material that is flame retardant according to DIN 4102 and a temperature resistance of up to 100° C.

WeldFlex has a number of highly unique attributes including being self-extinguishing, high flexibility, extreme helix-like PVC structure and is available from 52 mm to 505 mm in diameter and is designed for use in a variety of industries including those where explosion issues and safety are paramount.

Top requirements for extraction systems

  1. The air required at each hood must be of sufficient volume and velocity to capture the waste product produced during manufacture, for example where there are cutting wheels operating at high speeds (revolutions).
  2. The conveying velocity (speed) required to convey waste material through the ductwork must be high enough to ensure that the material does not fall out of the airstream onto the floor of the ducting, causing blockages in the system and bringing production to a halt. In continuous shift plants, this is extremely important.
  3. The fan that is selected must produce the adequate air volume for every hood sized to overcome resistance to airflow inherent in any dust extraction system; this is also a very important factor.
  4. The actual type of dust collector used is vital to a successful outcome. In other words, the correct selection of dust collector for the job is of critical importance, both to the worker and to the company.
  5. The cleaning device on the dust collector must ensure that any pressure drop across the filter media does not to rise to the point where the airflow in the system is reduced below the design-specified minimum. The right cleaning system for the collector must be chosen to maintain the correct pressure drop across the filter material while production continues.
  6. If pressure is allowed to rise beyond the design maximum the whole system will fail in its intent to remove dust and contaminants from the work environment.

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