Fire Fighting Pumps

Portable pump

Vehicle mounted pumps

Centrifugal pump Two parts Impeller Volute

operating principle Water inlet vanes Water discharge at periphery

Single stage / Multi Stage Gland packing – graphite, cotton or asbestos flax

Characteristics of centrifugal pump No flow – pressure is maximum Delivery valves opened - pressure decreases Pumps speed increases – pressure to increases Drive – IC engine Pump performance – suction lift

Pump performance Duty point – maximum quantity of water as specific pressure. 7 Kg/cm2 at 3 mt depth

Priming devices Reciprocating primer Exhaust ejector Rotary (sliding vanes) Rotary (water ring)

Reciprocating Primer It is small force pump which is driven the main pump drive shaft. Usually arranged in pairs or single position double acting pumps. RPM 1000 to 1500. Advantages: Simple to operate Highly efficient Positive in action Operates at low engine speed. Dis-advantages: Bulky No. of working parts liable to wear and tear.

Exhaust Ejector Primer It utilizes exhaust gas from engine which are diverted through directed across the apparatus of a tube connected to the impeller chamber. requires full engine speed Advantages: Simple in operation Less subject to damage and mis-handling Dis-advantages: Less efficient than reciprocating primers Acting back pressure on engine

Exhaust Ejector Primer It utilizes exhaust gas from engine which are diverted through directed across the apparatus of a tube connected to the impeller chamber. requires full engine speed Advantages: Simple in operation\ Less subject to damage and mis-handling Dis-advantages: Less efficient than reciprocating primers Acting back pressure on engine

Water Ring Primer WATER ‘RING’ ROTATING IMPELLER DISCHARGE PORTS SUCTION PORT STATIONARY BOSS HOUSING

Multi-pressure pump

Pump Casing

Cross section of Pump

Water Ring Primer WATER ‘RING’ ROTATING IMPELLER DISCHARGE PORTS SUCTION PORT STATIONARY BOSS HOUSING

reduced service times

operating principle

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