5.3.1 Priming of a flooded pump
a)As discharge valve is closed, fill the pump by opening the valve at suction. Let air escape by removing the plugs located on the pump.
b)The discharge pipe is headed and there is a
c)When the pump is totally free of air bubbles, replace the plugs.
Air escape
Priming of a flooded pump
5.3.2 Priming of a sump suction pump
* With foot valve:
a)Fill suction pipe and casing with liquid from an independent source (pressure 1 to 2 bars or 15 to 30 psi).
b)Let air escape by removing the plugs located on the pump.
c)When the pump is totally free of air bubbles, replace the plugs.
External source | Air escape |
|
Priming of sump suction pump with foot valve
*Without foot valve:
Priming may be accomplished by means of venting system.
Foot valves are not recommended when the pumped liquid has suspended solid particles. They may lodge between foot valve seat and shutter.
5.4 Starting the pump
5.4.1Bring controls and preparation before the first starting and after each service call
Necessarily:
a)Check the tightening of the different plugs.
b)Check that the gland lightly tightens the packing rings.
c)
Risk of seal ring overheating.
d)Check the direction of rotation of the motor. Refer to the rotation arrow of the pump.
e)
Install all protection systems and more particularly the coupling guard and the shield grid (reference [9331]) of the bearing.
f)Open all suction valves (if existing).
g)Close the outlet valve and the bypass valve.
h)Ensure inlet pipe and pump casing are completely full of liquid.
5.4.2 First pump start-up
Suction valves must be fully open when pump is running. Never run the pump dry, it will cause damage.
a)Start motor and check outlet pressure.
b)If pressure is satisfactory, slowly OPEN outlet valve.
c)Do not run the pump with the outlet valve closed for a period longer than 30 seconds.
d)If NO pressure, or LOW pressure, STOP the pump. Refer to faultfinding chart for fault diagnosis.
The pump should run smoothly and without vibration.
The pump must never run at a capacity of less than 40 % of that at the best efficiency.
Never remove a plug when the pump is running.
Page 18 of 28 | flowserve.com |