AH, AHP, M, L, HH pumps are also called as heavy-duty pumps. They can be operated in multi-stage series installation within the maximum working pressure of various types of pump because these types of pump have fitted with thicker wear -parts and large-duty frame , suitably transporting highly abrasive high density slurry or lower density high head slurry . Among of them, type HH pump is suitable for lower density and abrasive high head slurry. Above types of pumps also can be used in certain corrosive slurries.