1. Introduction
1.1. Dusts
According to BS 2955: 1958 [1,2], materials with particle
size less than 1000 m (16 BS mesh size) are defined as ‘powders’;
when particles have a diameter less than 76 m (200 BS
mesh size), they are referred to as ‘dust’. As per NFPA [3]
‘dust’ is any finely divided solid, 420 m or less in diameter.
Given the nearly six orders-of-magnitude difference between
the sizes stipulated by BS 2955 and NFPA 68, it may be safer
to follow the somewhat wider view of Palmer [4] which does
not exclude from his treatment even particle diameters coarser
than 1000 m [2]. In this write-up we have used the term
‘dust’ for all particulate material, irrespective of the particle
size.
More than70%of dusts processed in industry are combustible
[5]. This implies that majority of industrial plants that have dustprocessing
equipment are susceptible to dust explosions.
1. Introduction
1.1. Dusts
According to BS 2955: 1958 [1,2], materials with particle
size less than 1000 m (16 BS mesh size) are defined as ‘powders’;
when particles have a diameter less than 76 m (200 BS
mesh size), they are referred to as ‘dust’. As per NFPA [3]
‘dust’ is any finely divided solid, 420 m or less in diameter.
Given the nearly six orders-of-magnitude difference between
the sizes stipulated by BS 2955 and NFPA 68, it may be safer
to follow the somewhat wider view of Palmer [4] which does
not exclude from his treatment even particle diameters coarser
than 1000 m [2]. In this write-up we have used the term
‘dust’ for all particulate material, irrespective of the particle
size.
More than70%of dusts processed in industry are combustible
[5]. This implies that majority of industrial plants that have dustprocessing
equipment are susceptible to dust explosions.
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