Pneumatic units may not be the best fit for every bulk handling job, as Stevie Knight discovers. While it's often said that pneumatic units come into their own with a variety of ships, smaller holds and a range of bulk; finding a 'fit' is not a straightforward calculation. Comparing efficiency means looking at so-called 'peak' capacity - the maximum rate given optimal conditions - but also the more realistic nominal measure that factors in non-productive arm movements, and a final 'through the ship' assessment that also takes account of the clean-up phase. And these will be different for every type of machine. Dave Bergenstock of FLSmidth explains: "Pneumatic unloaders are typically designed for a peak capacity range of to tph tonnes per hour. Higher capacity designs are less practical due to the higher power consumption.