Rotary Twin Gear Pumps

INTERNAL POWER LOSSES
The internal power losses in rotary pumps are of two types the mechanical losses is the power necessary to overcome frictional drag of all the moving part withing the pump while viscous losses id power required to overcome liquid viscous drag & shearing action of the fluid. this can be computed from the graph on the opposite side
H.P CALCULATION
The break horse power required to drive a rotary pump is sum of the theoretical hp & internal losses. the theoretical horse power is the actual work done is moving the fluid from inlet port to out let pressure condition & is product of constant C=0.037,Capacity in cub. Mt/hr. & pressure Kg/Sq. Cm or constant C=2.39,Capacity is us G.P.M. & Pressure in PSI
PUMP SELECTION & USES
The bush bearing type of pump can be used for clean viscous liquid having sufficient lubricating Value such as clean lube oil vegetable oil, Fish & Animal oil, Gear oil, Glycerine, Hydraulic oil for intermittent duty. However for continues duty pump with needle roller bearing in SI Series should be selected for liquid having low viscosity poor lubricating values of containing dirts or impurities Such as asphalt bitumen Furnace oil tar, Cellulose, Starch LSHS, HPS, Molasses Napthia, Phenol resin, RFO, Silicate Soap Solution Viscous wax etc.
INSPECTION AND TESTING
All pumps are individually tested for its performance as per JIS B- 8312- 1976