Flowserve MARK 3 GROUP 4 - Manual (Page 13)

MARK 3 GROUP 4 USER INSTRUCTIONS ENGLISH 71569286 08-12
Page 13 of 48 flowserve.com
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with a rust preventative compound and openings are
provided with covers or plugs. Shaft packing, when
required, is shipped with the pump and should not be
installed until the pump is ready to run. Mechanical
seals, when provided, are factory installed and
adjusted prior to shipment. The axial impeller
running clearance is preset at the factory but should
be checked prior to final alignment in case of
tampering.
3.2 Name nomenclature
The pump size will be engraved on the nameplate.
The following example explains how the pump name
identifies the construction features and options.
4K10x6-18OP
Group size
Power end
Nominal suction branch size
Nominal discharge branch size
Nominal maximum impeller diameter
Open impeller
3.3 Design of major parts
3.3.1 Pump casing
The pump casing is a volute type casing with
integrally cast feet and top centerline discharge
nozzle. It is a one piece pressure retaining casting
with gasket connections to the stuffing box head and
the suction and discharge flanges.
3.3.2 Impeller
The impeller is semi-open design, keyed to the shaft
and secured with a contoured impeller nut. The
vanes of the impeller are Francis type.
3.3.3 Shaft
The large diameter stiff shaft, mounted on bearings,
has a keyed drive end.
3.3.4 Pump bearings and lubrication
Ball bearings are fitted as standard and may be
either oil or grease lubricated. Oil lubrication is only
available where the pump shaft is horizontal.
3.3.5 Bearing housing
For oil lubricated bearings, a bulls eye level gauge is
supplied. Constant level oilers can also be fitted. Two
grease nipples enable grease lubricated bearings to
be replenished between major service intervals.
3.3.6 Stuffing box housing
The stuffing box housing has a spigot (rabbet) fit
between the pump casing and bearing housing for
optimum concentricity. The design enables a
number of sealing options to be fitted.
3.3.7 Shaft seal
The mechanical seal(s), attached to the pump shaft,
seals the pumped liquid from the environment.
Gland packing may be fitted as an option.
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, drive shafts
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.
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 (350 ºF)
Minimum ambient temperature -20 ºC (-4 ºF)
Maximum ambient temperature +50 ºC (122 ºF)
Maximum soft solids in suspension up to 7 % by volume
Maximum pump speed Refer to the nameplate
3.4.2 Speed torque curves
To bring a centrifugal pump up to rated speed, the
driver must be capable of providing more torque at
each speed than required by the pump. 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. Normally, this is not a
problem with standard induction or synchronous
motors provided the proper voltage is supplied at the
motor.
For pumps started at shut valve conditions, 100
percent full speed torque can be calculated by using
the formula:
Torque (Nm) = 9545 Shutoff Power (kW)
r/min