World Grain - February 2008 - 63

GRAINOPERATIONS

velop an Explosion Protection Plan
consisting of a three-step approach that
includes the following:
* Identify the areas of highest risk to
personnel and your business by categorizing them as low, medium and high risk.
* Determine the probability of an
explosion occurring into low, medium

or high probability.
* Prioritize based on the areas of
highest risk and highest probability being tackled first.
Examine the improvement options
available and determine which option
is best, taking into account local circumstances, complexity of the solution,

and cost. As mentioned before, some
solutions may only require a change in
procedures or working practices, such
as improving housekeeping or better
maintenance planning. The reasoning
and rationale behind the decision should
be recorded.
It is recommended that this step is

Comparison of explosion protection measures
Protective measure
Containment

Comments

Cost

Plant strong enough to contain explosion; useful for small vessels and connecting pipework

$$$

Rotary valves

Passive, simple and familiar to grain industry; must have close-fitting metal vanes to be effective

$$$

Screw conveyors
with plugs and
baffles

Passive, simple and familiar to grain industry; must be correctly designed to be effective

$$

Passive barrier
valves

Passive, simple, useful for inlets to dust filters on general exhaust systems; not suitable for high dust loads (e.g.
pneumatic conveying)

$$

Fast-acting gate
valves

Can be used in areas of high dust load (e.g. pneumatic conveying lines); requires activation signal from suitable
detectors.

$$$

Chemical barriers

Can be used in almost any situation including cluttered areas such as elevator legs; requires activation signal
from suitable detectors.

$$$$

Suppression

As above, can be used in almost any situation where other measures are not practical; requires activation signal
from suitable detectors; stops explosion development at source

$$$$$

Burst panels

Simple, inexpensive, common in the grain industry; must be correctly sized and vent to a safe area.

$

Flameless vents

Useful where burst panels are not practical; quenching of flame front

$$

Isolation

$ = least expensive
$$$$$ = most expensive
Source: Ged Begley; Euratex

Elevator belting

Elevator buckets

The power behind
your transport
Oi ".

Conveyor chains

Screws

WWW.VAV.NL VAV
Postbus 3041, 2220 CA Katwijk, Nederland
Tel: +31 (0)71 4023701, E-mail: contact@vav.nl

For more information, see Page 86.

64

February 2008 / World Grain / www.World-Grain.com



http://WWW.VAV.NL http://www.World-Grain.com

World Grain - February 2008

Table of Contents for the Digital Edition of World Grain - February 2008

Contents
World Grain - February 2008 - 1
World Grain - February 2008 - 2
World Grain - February 2008 - 3
World Grain - February 2008 - Contents
World Grain - February 2008 - 5
World Grain - February 2008 - 6
World Grain - February 2008 - 7
World Grain - February 2008 - 8
World Grain - February 2008 - 9
World Grain - February 2008 - 10
World Grain - February 2008 - 11
World Grain - February 2008 - 12
World Grain - February 2008 - 13
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World Grain - February 2008 - 16
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World Grain - February 2008 - 18
World Grain - February 2008 - 19
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