Health & Safety
observe dust rising from the ground where the sprinkler water There are several ways to generate fog at the required micron
lands, thus exacerbating the problem! Irrigation systems can be sizes, the two main techniques are:
used to control dust on outdoor stockpiles, but the instant they 1. Pressurise the water to high pressures e.g. 70 Bar and use
are excavated, dust will arise as the drier material in the pile is nozzles with a special impeller to atomise and thereby generate
exposed and moved around. An irrigation system uses a lot the fog. (see nozzle picture on this page)
more water than a fogging system – typically 10 times the 2. Inject compressed air into the water stream and force it to hit
amount – and is much less effective. a target to atomise the water.
The second approach whilst effective, can have a high cost of
ownership for systems requiring more than a handful of nozzles.
Use of compressed air nozzles becomes very expensive to
operate as the energy required is large.
The Renby Fogging System uses pressurised water as in
option 1 and will typically only require 1.5kW for a system of
50+ nozzles. Water consumption would also be low at 6 litres
per minute for such a system. The nozzle based system is very
versatile, enabling nozzles to be placed just where they are
required. The flow rate at each point is determined by the
nozzle, which is easily interchangeable and there is no calibration
required. The 70 Bar pressure is also important, much lower and
the droplet size will be too large.
A common misconception with fog is that it will wet material.
By careful design of the system, fog can be distributed to
achieve the required objective of suppressing dust whilst
keeping moisture to a minimum. Comparing the small volume
of water with the huge volumes of material handled in the
process, it can be seen that the percentage of water introduced
Pressurised water fogging nozzle
is negligible.
Ring Grip Series 689, 688 & 698
The Tuf-Lok ring grip pipe coupling is a rugged,
heavy duty, self-aligning and self-grounded pipe
coupling with a high end pull. It can be used
for almost any application where pipe ends need
to be connected. The Tuf-Lok coupling installs
quickly and aligns pipe ends with little effort.
Features
Self-aligning
High pressure rated
Full vacuum rated
Usable on thin or
thick wall pipe
Smooth internal
connection
Low cost
Reusable
Absorbs vibration
Externally leakproof
Tuf-Lok (UK) Limited
Tel: +44 (0) 1706 822512
Email: sales@tuflok.co.uk www.tuflok.com
www.solidsandbulk.co.uk February 2010 Solids & Bulk Handling 43
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