DOUBLE ACTING RECIPROCATING PUMP
Objective
To conduct a performance test on double acting reciprocating pump.
Apparatus used:
Reciprocating Pump Setup with Motor, Collecting Tank, Spring Balance, Pressure Gauge, Stopwatch.
Description Reciprocating Pump: is a positive displacement pump, it operates on the principle of actual displacement or pushing of liquid by a piston or plunger that executes a reciprocating motion in a closely fitted cylinder. The liquid is alternatively drawn from the pump and filled into suction side of the cyliner. The liquid fed to discharge side of the cylinder and emptied to the delivery pipe.
Delivery Head: is defined as the work that needs to be performed by the pump to pump the medium with reference to a defined unit of weight.
Suction Head: is the term used to describe liquid pressure at pump suction in terms of height of liquid column.
Start the reciprocating pump by pressing the start button.
Set the speed of motor to be constant by turning the knob.
Speed of the motor (Nm) =
Speed of the pump (Np) =
Take the delivery head reading corresponding to the discharge.
Delivery head (Hd)=
Delivery head (Hd)=
Take the suction head reading corresponding to the discharge.
Suction head (Hs)=
Suction head (Hs)=
z = 15cm
Total Head (H)=
H (m) = Hs+Hd+z
Coincide pointers by turning the wheel and get spring balance reading to determine torque.
Torque reading (τ) =
τ(N-m) = S×r×gSpring balance reading (S)=
Radius of torque area (r) = 0.1m
Note the actual discharge of water in the collecting tank by closing the stopper.
Area of collecting tank (A) = 0.125m2
Time required by water to fill 10 cm height (t1)=
Actual discharge, Qact =
Qact (x 10-4m3/sec)= (A × h)⁄t1Calculate the time taken by the energy meter for 5 revolution.
Time taken by energy meter for 5 revolution =
