Pneumatic conveying systems provide a totally enclosed environment throughout for the transport of materials

Dust, mess and spillage that are often found surrounding bulk solids handling
plant are not generally caused by pneumatic conveying systems. Feeders for
pneumatic conveying systems, for example, usually fit under hoppers, and these in
turn are fed from above by other systems, such as chain and flight (en-masse) conveyors.
Dust and mess in the area often comes from poor integration of the mechanical
conveyor with the hopper, and not with the pneumatic conveyor. In terms
of plant safety, therefore, due consideration must be given to the interfacing of
different systems, particularly if they are operating in series [I].
Pneumatic conveying systems provide a totally enclosed environment
throughout for the transport of materials, and along the conveying route there are
no moving parts at all, unless diverter valves are employed for multiple point offloading.
Some feeding devices, such as blow tanks, Venturis and vacuum nozzles
have no moving parts, apart from valves opening and closing at the start and end
of the process. Although pneumatic conveying systems are capable of releasing
dust into the atmosphere, it generally occurs only as a result of a fault situation,
and is not an endemic problem with the conveying system.