Table of Contents
Advertisement
10
___________________________________________________________________________________________
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 Technical Data section for
general arrangement drawings.
Bowl Assembly
The 7000-NSF series single stage bowl assembly is made up of a suction bell, a top intermediate bowl and
impeller, and a discharge case. Units of two or more stages include a suction bell, multiple intermediate
bowls and impellers and 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 20 foot (enclosed lineshaft only).
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 water 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.)
For pumps used in potable water service, water flush source must be compatible with potable water
application.
Fairbanks Nijhuis™
6M-44GB 7000-NSF, 7100-NSF Vertical Turbine Pumps
CAUTION
Installation, Operation, and Maintenance
03/2018
Advertisement
Table of Contents
