FRBH, FRBHX AND FRBHS USER INSTRUCTIONS ENGLISH 71569178 20-08
Page 13 of 60
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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.
8FRBH182
Nominal discharge branch size.
Configuration
–
see below.
Nominal maximum impeller diameter.
Frame size
FRBH
–
standard construction
FRBHS
- recessed impeller
FRBHX
–
expeller seal installed
Suffix codes after the pump name generally describe
hydraulic variations, special impeller or casing volute
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 however, the “S”
configuration utilizes straight radial vanes to reduce
blockage. The impeller of the FRBHS pump is recessed
away from volute to reduce shear.
3.3.3
Shaft
The large diameter stiff shaft, mounted on bearings,
has a keyed drive end and impeller mount.
3.3.4
Pump bearings and lubrication
Ball bearings are fitted as standard and may be either
oil or grease lubricated. Special bearing configurations
may be provided.
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. The “FRBHX”
model is fitted with an optional dynamic or expeller seal
for certain applications.
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)
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
