Flowserve MJ Slurry - Manual (Page 13)

MJ SLURRY USER INSTRUCTIONS ENGLISH 71569294 - 02/08
Page 13 of 54
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MAXIMUM WORKING PRESSURE
TEMPERATURE STANDARD DUTY
(ºF) (ºC.) Bar (PSIG.)
-20 TO
100 -7 TO 38 7.6 (110)
150 65 7.6 (110)
High Chrome Iron is standard for all pumps, special
materials are available upon request.
Consult a Flowserve Sales Office or a Distributor for
material selection and compatibility with the slurry
product.
bearings contained in a stainless sleeve and mounted
in a bearing housing. Intermediate bearings are located
to ensure shaft critical speeds are above the operating
speed.
3.3.5 Bearing housing
Grease nipples enable grease-lubricated bearings to be
replenished between major service intervals.
3.3.6 Lower and Intermediate bearing housing
The bearing housings below the top plate have a spigot
(rabbet) fit between the pump casing and column pipe
or between column pipes for optimum concentricity.
3.3.7 Driver
The driver is normally an electric motor. Due to the
hardness of the impeller the norm is to use multi-v-
belts.
3.3.8 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 +66 ºC (150 ºF)
Maximum ambient temperature up to +50 ºC (122 ºF)
Maximum soft solids in suspension up to 7 % by volume
Maximum pump speed Refer to the nameplate
Maximum Water Flush temperature up to +38 ºC (100 ºF)
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
Torque (lbfx ft) = 5250 Shutoff Power (hp)
r/min
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 percent
torque on the design power of the driver and
consequently the speed-torque curves should be
plotted in torque units (e.g. Nm) instead of percentage
torque to avoid confusion.
3.4.3 MAXIMUM WORKING PRESSURES -bar (psi).