One of the most popular applications of Hydro Pneumatic Reciprocating Pumps is for pressure / burst testing of Castings, Valves, Hoses, Pressure Vessels etc. The general layout of a hydrostatic pressure testing. The product under test (ex. casting) is first prefilled with water using a low pressure, high discharge “CENTRIFUGAL PUMP”. When all trapped air escapes and the casting is fully filled, the “DRAIN” valve and the “CENTRIFUGAL PUMP” are switched “OFF” and the “HYDRO PNEUMATIC PUMP” is switched “ON” by sliding “Hand Slide Valve” forward. When pressure in gauge P2 rises to the value set in regulator P1, the “ISOLATION” valve is closed and after a slight delay the “HYDRO PNEUMATIC PUMP” should be switched “OFF” by sliding “Hand Slide Valve” backward. Any leakage in the product is detected by drop in pressure gauge P2. After the test time, the drain valve is opened to release pressure and drain the water.
Some of the other applications where “Hydro Pneumatic Pumps can be used as a low cost alternative to hand operated and motorised hydraulic pumps are: ( )i Cyclic Pressure / life Testing of Pressure Gauges, Pressure Switches, Hoses etc. ( )Burst Strength Testing of pressurised vessels such as LPG / Nitrogen / Oxygen gas ii cylinders, storage tanks, hoses, pipes etc. ( )Seat leakage test of Control Valves. iii ( )Operation of Single Acting Hydraulic Cylinders used in lifting platforms, hydraulic clamps, iv compression moulding presses etc. ( )Isostatic Pressing of powder metals and ceramics. v () vi Transferring of liquids from barrels, storage tank etc. (vii) Pumping oil or grease in centralized lubrication systems.
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