Flowserve WUC Worthington - Manual (Page 14)

WUC USER INSTRUCTIONS ENGLISH - 07/14
Page 14 of 52
3.2 Nomenclature
Example:
200WUC-2M-5+I
200
Flow at BEP
WUC Pump type - Can
WUJ = without Can
2
indicates speed 2–poles
4 = 4-poles
M
indicates hydraulic Medium Head
L = Low Head
H = High Head
R = Radial Flow
5 Number of stages
I
indicates Inducer as option
D Dummy stage as option
3.3 Design of major parts
3.3.1 Motor stool
The motor stool supports the thrust bearing. On top
the driver is mounted.
3.3.2 Headstock
Headstock has inline suction and discharge nozzle,
including all the necessary vent and drain
connections. It is a major part of the pump unit, which
supports the column pipes with the hydraulics as well
as the motor stool and driver.
3.3.3 Can
The Can is subjected to suction pressure and guides
the fluid to the first stage impeller.
3.3.4 Hydraulics
3.3.4.1 Radial flow hydraulics
This are ring section type hydraulics. Suction, stage
and discharge casing are hold together by strong tie
bolts, which allows a very compact and short design.
The radial impellers are hydraulically balanced by
back wear rings and balancing holes. The diffusers
are designed with 7 to 11 vanes to minimize the
radial forces at part load operation. All impellers are
slipped on the shaft and axially fixed by the impeller
nut. The shaft is supported in the suction casing, in
every diffuser and in the discharge casing.
Optional the hydraulics can be fitted with an inducer
for low NPSH requirement.
3.3.4.2 Mixed flow hydraulics
The hydraulics consists of flanged bowls and a
suction casing. The impellers are hydraulically
balanced by back wear rings and balancing holes.
The diffusers are designed with 7 to 11 vanes to
minimize the radial forces at part load operation. All
impellers are slipped on the shaft and axially fixed by
the impeller nut. The shaft is supported in the suction
casing and in each bowl.
Optional the hydraulics can be fitted with an inducer
for low NPSH requirement.
3.3.4.3 10WUC-2H
The hydraulic consists of bowls, which are pushed
together and hold by strong tie bolts. The impellers
are secured to the shaft by split rings. Due to the
small size, the impellers are only equipped with front
wear rings and therefore unbalanced.
Optional the hydraulics can be fitted with an inducer
for low NPSH requirement.
3.3.4.4 20WUC-2L, 45WUC-2L, 80WUC-2L
The hydraulics consists of flanged bowls and a
suction casing. The impellers are secured to the shaft
by split rings. Due to the small size, the impellers are
only equipped with front wear rings and therefore
unbalanced.
Optional the hydraulics can be fitted with an inducer
for low NPSH requirement.
3.4 Performance and operating limits
In the interest of operator safety
the unit must not be operated above the nameplate
conditions. Such operation could result in unit failure
causing injury to operating personnel. Consult
instruction book for correct operation and
maintenance of the pump and its supporting
components.
4.0 INSTALLATION
Equipment operated in hazardous locations
must comply with the relevant explosion protection
regulations, see section 1.6.4, Products used in
potentially explosive atmospheres.
4.1 Location
The pump should be located to allow room for
access, ventilation, maintenance and inspection with
ample headroom for lifting and should be as close as
practicable to the supply of liquid to be pumped.
Refer to the general arrangement drawing for the
pump set.