Flowserve LR Worthington - Manual (Page 11)

LR, LRV, LLR and LR-S USER INSTRUCTIONS ENGLISH 71569088 08-10
Page 11 of 48 flowserve.com
3 PUMP DESCRIPTION
3.1 Configurations
The LR range of pumps are horizontal split casing
volute type centrifugal pumps designed for water
works, drainage, general service and circulating
applications. They can be used with motor, steam
turbine and gasoline or diesel engine drives.
The range can have the following configurations:
LR single-stage horizontal suction and discharge nozzles.
LLR two-stage horizontal suction and discharge nozzles.
LR-S single stage horizontal suction and discharge nozzles.
LRV single-stage LR horizontal suction/discharge nozzles,
with vertical pump shaft.
3.2 Name nomenclature
The pump size will be engraved on the nameplate
typically as below:
6LR-18S
Nominal discharge branch size
Configuration – see 3.1 above
Nominal maximum impeller diameter
Tongue and groove casing rings fitted
The typical nomenclature above is the general guide
to the LR configuration description. Identify the
actual pump size and serial number from the pump
nameplate. Check that this agrees with the
applicable certification provided.
3.3 Design of major parts
3.3.1 Pump casing
The pump has its main casing gasket axial to the
shaft allowing maintenance to the rotating element by
removing the top half casing. Suction and discharge
branches are in the bottom half and therefore remain
undisturbed.
3.3.2 Impeller
The impeller is fully shrouded and may be fitted with
optional hub rings.
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.
Bearing isolators or stationary labyrinths may be fitted
as an option in the bearing covers to protect the
bearings.
The LRV as standard has a liquid lubricated journal
bearing fitted at the non-drive end. This bearing is
lubricated by pumped product or from an external
clean source.
3.3.5 Bearing housing
Two grease nipples enable grease lubricated bearings
to be replenished between major service intervals.
LR-S pumps have sealed for life bearings and cannot
be re-greased.
For oil lubricated bearings, a constant level oiler is fitted.
3.3.6 Seal housing
The design enables one of 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 on the LR, LR-S, and LLR.
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.