moyno 2000 CC, Service Manual

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2
The next letter indicates whether there are any special options
being used in the pump, typically this is an A for no special
options.
The next letter indicates the suction configuration. For this
pump an A is used designating a standard flanged pump.
The last letter indicates the drive configuration and
flange/shaft/seal size. In our close coupled pump nameplate
the C designates a 250mm flange and 45mm shaft.
2-1. INSTALLATION
2-2. General
Accessibility to the pump and adequate clearance should be
prime considerations in any installation. Enough space should
surround the unit so that maintenance can be performed with
ease.
2-3. Piping
1. Suction piping should be as short as possible. Normally,
the suction line should be the same diameter as the pump
suction; however, conditions such as high viscosity or
required minimum flow velocities may dictate otherwise.
Long-sweep 90-degree elbows or 45-degree elbows
should be used instead of the standard elbow. Avoid using
suction piping loops, which trap air.
2.
Discharge piping diameter should generally be as large as
the discharge port unless fluid conditions indicate
otherwise.
3. An easily removable section of piping, at least twice as
long as the stator, should be mated to the discharge port.
This will allow the rotor and stator to be removed without
having to remove the complete pump from the base.
2-4. Foundation
For maximum pump-driver unit life, each unit should be
mounted on a strong steel baseplate. The baseplate should be
mounted on a firm foundation. The motors should be supported
on close-coupled configurations above 30 HP.
3-1. OPERATION
3-2. Initial Check
Before putting the pump into operation, the following items
should be checked to ensure that each piece of equipment is
installed correctly:

Electrical connections.

Gauges and other instruments.

Pump rotation. Rotation is indicated on the pump
nameplate.

All valves should be open on both suction and discharge
sides of pump.

Seal flush systems if required should be operational.
Double seals require flushing between faces.
CAUTION: This is a positive displacement pump. Do not
operate it against a closed valve.
3-3. Start-Up
CAUTION: DRY OPERATION IS HARMFUL TO THE PUMP!
Never allow the pump to operate without liquid, as dry
operation will cause premature wear of the stator and possible
damage. The liquid being pumped lubricates the stator.
1. Before operating the pump for the first time, fill it with liquid
to lubricate the stator for the initial start-up.
Note: If the pump is shut down temporarily, enough liquid will
remain in the system to provide lubrication upon restarting. It
is advisable to maintain the suction piping at a higher
elevation than the centerline of the pump in order to contain
some liquid in the pump at time of shutdown.
2. Once the pump has been filled with liquid, check for direction
of pump rotation by momentarily starting and stopping the
drive. See pump nameplate for correct rotation.
3. Start seal flush water if so equipped.
4. Start pump.
3-4. Packing Leakage
The packed stuffing box is designed to control leakage, not stop
it completely. Leakage is necessary to reduce friction and
dissipate heat.
In a new pump, before the packing has had a chance to seat
properly, excessive leakage through the stuffing box is common.
Frequent adjustments of the packing gland may be necessary
during the first few hours of operation in order to compress and
seat the packing. See Section 4-3.
4-1. MAINTENANCE
4-2. General
The Moyno 2000 CC pump has been designed for a minimum of
maintenance, the extent of which is routine adjustment of the
packing. The pump is one of the easiest to maintain because the
main elements are very accessible and require few tools to
disassemble.
4-3. Packing Adjustment
Packing gland nuts (see Figure 4-1) should be evenly adjusted.
Overtightening the packing gland may result in premature
packing failure and possible damage to the shaft and gland.
Figure 4-1. Cross Section of Packing Housing