DURCO MARK 3 ISO FRAME MOUNTED ENGLISH 85392719 06-12
Page 24 of 52
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5.7 Starting the pump
5.7.1
Starting the non self primer casing pump
a)
Ensure flushing and/or cooling/
heating liquid supplies are turned ON, before
starting pump.
b) CLOSE the outlet valve.
c) OPEN all inlet valves.
d) Prime the pump, ensure the air within the pump
has a route to escape.
e) Start motor and check the outlet pressure.
f) If the pressure is satisfactory, SLOWLY open the
outlet valve.
g)
Do not run the pump with the outlet
valve closed for a period longer than 10 seconds.
h) If NO pressure, or LOW pressure, STOP the
pump. Refer to section 7, Faults; causes and
remedies, for fault diagnosis.
5.7.2
Starting the self priming casing pump
a)
Ensure flushing and/or cooling/
heating liquid supplies are turned ON, before
starting pump.
b) CLOSE the outlet valve.
c) OPEN all inlet valves.
d)
Prime the pump. (See section
5.6.2.) The pump casing must initially be filled
with compatible liquid before starting the unit.
e) Damage will occur if the pump is run dry or for
prolonged periods with no incoming liquid.
f)
Subsequent filling should not be necessary unless
the pump has been emptied or drained of fluid.
g) Start the motor and, if no specific provision has
been made in the delivery pipework for evacuating
the primed air, open the delivery valve by
approximately 10 % to allow priming air to escape.
h) When the pump has primed, check outlet
pressure.
i)
If the pressure is satisfactory, SLOWLY open the
outlet valve.
j)
It is recommended that the priming time is noted.
Priming times in excess of 5 minutes will indicate
a pump or system fault. Any noticeable
increases in priming time on subsequent starts
will also indicate a fault. Irregular use could lead
to the risk of 'evaporation' of the priming fluid.
k)
Do not run the pump with the outlet
valve closed for a period longer than 30 seconds.
l)
If the pump has to fill the system it may take a
short time before the outlet is pressurized.
m) If NO pressure, or LOW pressure, STOP the
pump. Refer to section 7, Faults; causes and
remedies for fault diagnosis.
5.8 Running the pump
5.8.1
Pumps fitted with packed gland
If the pump has a packed gland there must be some
leakage from the gland. Gland nuts should initially be
finger-tight only. Leakage should take place soon
after the stuffing box is pressurised.
The gland must be adjusted evenly to give
visible leakage and concentric alignment of the gland
ring to avoid excess temperature. If no leakage takes
place the packing will begin to overheat. If
overheating takes place the pump should be stopped
and allowed to cool before being re-started. When
the pump is re-started, check to ensure leakage is
taking place at the packed gland.
If hot liquids are being pumped it may be necessary to
slacken the gland nuts to achieve leakage.
The pump should be run for 30 minutes with steady
leakage and the gland nuts tightened by 10 degrees at a
time until leakage is reduced to an acceptable level,
normally 30 to 120 drops per minute. Bedding in of the
packing may take another 30 minutes.
Care must be taken when adjusting the gland
on an operating pump. Safety gloves are essential.
Loose clothing must not be worn to avoid being
caught up by the pump shaft. Shaft guards must be
replaced after the gland adjustment is complete.
Never run gland packing dry, even for
a short time.
5.8.2
Pumps fitted with mechanical seal
Mechanical seals require no adjustment. Any slight
initial leakage will stop when the seal is run in.
Before pumping dirty liquids it is advisable, if possible, to
run the pump in using clean liquid to safeguard the seal
face.
External flush or quench should be
started before the pump is run and allowed to flow for a
period after the pump has stopped.
Never run a mechanical seal dry, even
for a short time.
Summary of Contents for Durco Mark 3
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