6EM Thru 18GM - 1100 Vertical Turbine Pumps 9
SECTION 2
INTRODUCTION
General Description
A vertical line shaft turbine pump consists of
five basic components. These components
are the pump bowl assembly, column pipe,
line shafting, discharge head, and driver.
Refer to the drawing section for general
arrangement drawings.
Bowl Assembly
The 1100 series single stage bowl assembly
is made up of a suction bell (or suction
case), a top intermediate bowl and impeller,
and a discharge case. Units of two or more
stages include a suction bell (or suction
case), multiple intermediate bowls and
impellers. Multiple stage open line shaft
construction does not require a discharge
case. Refer to the assembly drawing found
in the drawing section of this manual for
your specific configuration.
Column Pipe
Column pipe for pumps covered in this
manual can be either threaded or flanged.
Threaded column features straight threads
on both column ends and butt solidly
together within the coupling. Standard
nominal column lengths for threaded column
are 5 foot, 10 foot or any special length up
to 10 foot.
Flanged column includes registered fits for
accurate column alignment and are bolted
together. Flanged column pipe is available
in standard lengths of 10 foot or 5 foot; or
can be provided in any special length up to
10 foot.
Line Shafting
The turbine line shaft transmits torque from
the pump driver to the pump bowl assembly
and rotates inside the column pipe. Both
ends of the shaft are precision machined,
and are secured together with couplings.
This shafting is supported by bearings at
specific intervals; the types of bearings used
and how they are lubricated are described
as follows:
A. Open Line Shaft - Product Lubricated
This design is such that the line shaft
and bearings are exposed to and
lubricated by the liquid being pumped.
The line shaft is supported at intervals of
not more than 10' by bearings that run
on shaft sleeves. Support for these
bearings is supplied by bearing retainers.
The outer hub of the retainer is seated
between the two column ends. Refer to
the specific assembly drawings found in
the drawing section of this manual.
B. Enclosed Line Shaft
In the enclosed line shaft design shafting
is surrounded by tubing. This tubing
protects both the shaft and bearings
from the pumped liquid and provides a
channel for lubricating the shaft
bearings. The bearings have machined
grooves on their I. D. to allow lubrication
to flow from one bearing to the next.
These bearings are also threaded on the
outside diameter and are used to
connect the five foot enclosing tube
sections. Lubrication is normally oil from
a separate source. The enclosing tube
may be supported by spiders unequally
spaced to reduce the risk of vibration.
(See the Technical Data Section.)
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