14
15
STARTING THE PUMP
The pump must be primed prior to start-up.
When the source of liquid supplied to the pump is below
atmospheric pressure or located below the pump, priming may
be accomplished in any of the three ways listed below:
1) An exhauster may be connected to the discharge piping
between the pump and the discharge shut-off valve.
With the discharge shut-off valve closed and the suction
valve open, the air can be exhausted from the pump
and piping.
2) With a foot valve installed in the suction piping, the
pump may be filled with liquid introduced somewhere
above the pump in the discharge line. A foot valve may
create excessive friction losses and should be taken into
consideration in calculating the available NPSH.
3) A vacuum pump (preferably a wet vacuum pump) may
be used for evacuating air from the pump and piping.
The vacuum pump should be connected in the same
manner as the exhauster (See step 1).
When the source of liquid supplied to the pump is above the
atmospheric pressure or above the pump centerline, the pump
may be filled by venting through a bleed-off line to atmosphere
or back to the pump suction source.
When the pump is supplied with the standard “internal/inter-
nal” flush path, for cooling the magnets and lubricating the
bearings, the containment shell area of the pump is automati-
cally vented when the above procedure is followed. If the
pump is arranged with an “external/ internal” flush path, all
high points in the flush piping must also be vented when filling
to remove any trapped gas (air). If the pump is arranged with
an “external/external” flush path, all high points in the flush
piping must be vented when filling and vented again several
times during the first start up period until the pump reaches
stabilized operating temperature.
It is important that a pump should never be subjected to ther-
mal or pressure shock. The liquid should, therefore, be allowed
to flow into the casing slowly. A centrifugal pump should never
be started until all the parts are up to the temperature of the
liquid to be pumped.
If an external flush system is equipped with cooling water piping,
this should be turned on before filling the pump. Any other
heating or cooling should be turned on before starting the
pump. Turn the coupling end of the rotor shaft to see if the
pump turns freely. If it does not, investigate and correct the
cause before starting the motor.
CAUTION–EXTREME HAZARD TO PERSONNEL: Do not
operate a pump at no flow condition. Do not operate a pump
at a low flow condition, unless provision has been made to
prevent dangerous heat build up within the pump. Operating
this pump with the discharge and/or suction valves closed may
be extremely hazardous. The liquid in the pump will heat up
and this may result in high pressure in the pump in a short
time. Such pressure may result in a rupture of the pressure
containing parts and cause severe hazard to personnel and/or
damage to the system. The heat will also severely damage the
pump.
This pump should never be run without liquid in the casing.
Extensive damage will result, particularly to the sleeve bearings
and the magnets. When the pump is furnished with external
flushing piping, vent liquid through the high points in the pip-
ing system to provide lubrication to the sleeve bearings.
It is important to check the direction of rotation of the pump
before allowing the pump to come up to speed.
To check rota-
tion direction, remove the coupling spacer, push the starting
button and instantly push the stop button. This will allow the
motor to turn over a few revolutions and the direction of rota-
tion to be observed. A direction of rotation arrow is shown on
the front of the pump casing. If rotation is incorrect, change the
wiring connections and recheck the rotation. Replace the cou-
pling spacer and the coupling guard.
Operating the pump in
reverse rotation may cause extensive damage.
If the rotation direction is correct and the pump properly filled
with liquid, it may now be started.
A centrifugal pump should be started with the suction valve
completely opened and the discharge valve opened a slight
amount.
As soon as the pump is up to speed, the discharge valve must be
opened slowly. A centrifugal pump cannot be operated with the
discharge valve closed without heating up dangerously. During
the first several minutes of operating, watch the pump carefully
for overheating, vibration and other abnormal conditions. If
trouble develops, stop pump at once and correct the problem.
CAUTION
– When the pump is started, immediately observe
the discharge pressure gauge and/or the flow meter to confirm
that the pump is actually operating and at the expected values
of pressure and flow.
Operation of a magnetically coupled pump cannot be confirmed
by visual observation of the driver shaft (29A) (outer pump shaft)
rotation. The motor shaft and the driver shaft (29A) (visible,
external pump shaft) may be turning at full speed, but if the
magnetic coupling (inside the pump) has disengaged, the pump
is not moving liquid. This condition, if not stopped immediately,
will cause rapid overheating, equipment damage and possible
rupture of the pressure containing parts.
The M300 series pumps incorporate the latest technology and
are expertly manufactured and assembled to provide long,
trouble free operation. Additional security and safety can be
achieved with the installation of one or more optional monitoring
and protection systems.
1)
TEMPERATURE PROBE.
Many operational malfunctions
will directly result in a rapid increase in temperature of
the containment shell and/or the return flush liquid.
Temperature probes can be installed in the shell temperature
connection to monitor the containment shell and the
return flush liquid. The output signal from the temperature
probe(s) can be used to sound an alarm and should be
wired to shut down the pump when readings exceed
pre-set limits.
2)
ELECTRICAL POWER.
Current and power sensing devices
are available, to be mounted in the user's electrical
cabinet, which allows setting to electrical current or
power levels for shut down of the motor. In the event of
a disengagement (de-coupling) of the magnetic coupling,
the lower amperage or power sensed would shut down
the motor to protect the pump from more serious damage.
3)
VIBRATION.
A transducer is available which mounts on
the frame of the pump to monitor the vibration. It sends a
signal to a vibration switch mounted on the baseplate to
shut down the pump in the event of excessive vibration.
4)
PRESSURE SWITCH.
A pressure switch can be mounted
to sense pressure from the 1/4" NPT frame connection
or the 1/4" NPT frame drain. Pressure at these connections
would occur in case of a containment shell leakage and
would shut down the motor.
5)
LEVEL SWITCH.
A liquid level switch can be mounted to
the baseplate to detect leakage through the 1/4" NPT
frame drain in case of a containment shell leak to shut
down the motor.
6)
SECONDARY CONTAINMENT SEAL.
In the unlikely event
of a containment shell rupture, a secondary containment
sealing device, located in the frame, can be provided for
backup protection against leakage of hazardous liquids
to the atmosphere. If a shell rupture should occur, the
pumpage is contained in the frame surrounding the
containment shell, by a conventional mechanical seal.
CAUTION:
The secondary sealing arrangement is provided
for short term emergency backup only and is not intended
for prolonged operation. The pump should be shut down
immediately after the secondary seal is activated. A
pressure or level switch as described above must be used
to sound an alarm and shut down the pump immediately.
The frame drain connection and the secondary contain-
ment seal drain are provided to drain any leakage to a
safe area, before opening the pumping unit for repairs.
PUMP LUBRICATION
The ball type rotor shaft bearings are permanently grease
lubricated and require no additional lubrication.
The sleeve type bearings on the pump shaft are lubricated by
the liquid being pumped through internal flush passages, or
from an external flush. Conditioning of the liquid may be
required (such as filtering or cooling) for proper lubrication.
If the pump is fitted with the optional “Secondary Containment
Sealing Arrangement” it will be necessary to provide lubricant
for the mechanical seal. Use a good grade of rust and oxida-
tion inhibiting, non-foaming, industrial oil of 425-525 SSU
Viscosity at 100°F (ISO 100) for this lubrication.
Remove the oil fill plug from the top of the frame (26) (located
between the ball bearings [25 and 25A] near the coupling end
of the frame). Remove the oil level plug from the side of the
frame (26). Pour oil into the oil fill connection until it runs from
the oil level connection. This will be only about one cubic inch
of oil (approximately 0.5 fluid ounce). Replace the oil fill and
the oil level plugs and tighten.
OPTIONAL PROTECTION SYSTEMS
