Flowserve MP1 Sier-Bath - Manual (Page 13)

MP1 USER INSTRUCTIONS ENGLISH 26999958 – 10-12
Page 13 of 48 flowserve.com
3.3.3 Shaft
The drive shaft is mounted on bearings with the
pumping rotor and timing gear mounted to the shaft. It
has a keyed drive end. The driven shaft is also
mounted on bearings with the pumping rotor and
timing gear mounted to the shaft.
3.3.4 Timing Gears
The timing gears are mounted to the drive and driven
shafts with accurately located keys to maintain the
pumping rotors in mesh with no contact with each
other.
3.3.5 Pump bearings and lubrication
Antifriction radial and thrust bearings are mounted on
each shaft to support the induced loads. An external
lube oil system and/or an oil bath might be provided at
each end of the pump to lubricate the bearings and
timing gears.
An oil site gage might be supplied in the
bearing housings.
Certain multiphase applications may require a
separate lubrication and lube oil cooling system
depending on the condition of service.
3.3.6 Stuffing box/seal housing
The stuffing box housing is doweled to both the pump
casing and the bearing housing to ensure proper
alignment. It is supplied to fit appropriate mechanical
seals.
3.3.7 Shaft seal
The mechanical seals, attached to the pump shaft,
seal the pumped liquid from the environment.
3.3.8 Driver
The driver is normally an electric motor. Different drive
configurations may be fitted such as internal
combustion engines, turbines, hydraulic motors etc.
driving via couplings, belts, gearboxes etc.
3.3.9 Accessories
Accessories may be fitted when specified by the
customer.
3.4 Performance and operating limits
This product has been selected to meet the
specifications of your purchase order (See section 1.5
Duty conditions). The following data is included as
additional information to help with your installation. It
is typical, and factors such as temperature, materials,
and seal type may influence this data. If required, a
definitive statement for your particular application can
be obtained from Flowserve.
3.4.1 Operating limits
Pumped liquid temperature limits up to +177 ºC (300 ºF)
Maximum ambient temperature up to +50 ºC (122 ºF)
Maximum soft solids in suspension up to 1% by volume
Maximum pump speed Refer to the nameplate
3.4.2 Speed torque curves
To bring a rotary pump up to rated speed, the driver
must be capable of providing more torque at each
speed than required by the pump. Normally, this is not
a problem with standard induction or synchronous
motors, provided the proper voltage is supplied at the
motor.
The margin between the available and required torque
affects the time it takes the unit to reach full speed. If
the torque required by the pump exceeds the torque
capability of the drive at any run-up speed, the unit will
not accelerate to full speed.
For pumps started at set system resistance conditions,
100 % full speed torque can be calculated by using the
formula:
Torque (Nm) = 9545 Power (kW)
RPM
Torque (lbf · ft) = 5250 Power (hp)
RPM
Torque required by the pump at any other speed
during start-up can be determined from the curve
above. Note that the driver manufacturer usually
bases 100 % torque on the design power of the driver
and consequently the speed-torque curves should be
plotted in torque units (e.g. Nm or lbf · ft) instead of
percentage torque to avoid confusion.