HP mhp-tn Manuale Utente
MHP-TN USER INSTRUCTIONS ENGLISH 71576313 - 02/07
Page 18 of 28
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5.3.1 Priming of a flooded pump
a) As discharge valve is closed, fill the pump by
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.
removing the plugs located on the pump.
b)
The discharge pipe is headed and there is a
by-pass valve on the check valve, open
slightly the discharge valve and the by-pass of
the check valve.
by-pass valve on the check valve, open
slightly the discharge valve and the by-pass of
the check valve.
c)
When the pump is totally free of air bubbles,
replace the plugs.
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
a) Fill suction pipe and casing with liquid from an
independent source (pressure 1 to 2 bars or
15 to 30 psi).
15 to 30 psi).
b)
Let air escape by removing the plugs located
on the pump.
on the pump.
c)
When the pump is totally free of air bubbles,
replace the plugs.
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.
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.
They may lodge between foot valve seat and
shutter.
5.4 Starting the pump
5.4.1 Bring controls and preparation before the
first starting and after each service call
first starting and after each service call
Necessarily:
a)
a)
Check the tightening of the different plugs.
b)
Check that the gland lightly tightens the
packing rings.
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.
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.
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.
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.
will cause damage.
a)
Start motor and check outlet pressure.
b)
If pressure is satisfactory, slowly OPEN outlet
valve.
valve.
c)
Do not run the pump with the outlet valve
closed for a period longer than 30 seconds.
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.
pump. Refer to faultfinding chart for fault
diagnosis.
The pump should run smoothly and without
vibration.
vibration.
The pump must never run at a capacity of less
than 40 % of that at the best efficiency.
than 40 % of that at the best efficiency.
Never remove a plug when the pump is
running.