Flowserve VTP Wet Pit - Manual (Page 18)

VERTICAL TURBINE PUMPS (VTPS) CENTRIFUGAL PUMPS ENGLISH 71569224 – 10-13
Page 18 of 76 flowserve.com
A shaft sealing arrangement is located in the
discharge head to seal the shaft at its exit from the
liquid chamber.
The shaft seal will usually be either a mechanical
seal assembly or stuffing box with an open lineshaft
or a tube-packing box with an enclosed lineshaft.
Column assembly 3.3.3
The column assembly consists of column pipe, which
connects the bowl assembly to the discharge head
and carries the pumped fluid to the discharge head.
Houses and supports the shaft and may contain
bearings. Typical column assemblies are:
a) flanged column assembly
b) threaded column assembly: from 100 mm~355
mm (4~14 in.) sizes only.
The column supports shaft assembly, that is either
a) Open lineshaft construction utilizing the fluid being
pumped to lubricate the lineshaft bearings.
Or
b) Enclosed lineshaft construction has an enclosing
tube around the lineshaft and utilizes oil or other
fluid to lubricate the lineshaft bearings.
The shafts are threaded or key coupled with thrust
stud design or clamp ring design.
See sectional drawings supplied with the pump for
exact column assembly details as per the order. The
size and configuration vary depending upon the
specific order requirements and application criteria.
Bowl assemblies 3.3.4
The bowl assembly consists of impellers rigidly
mounted on the pump shaft coupled to an electric
motor. Impellers are cast wheels with multiple diffuser
vanes and are generally coated to meet the hydraulic
requirements. See section 8.0 for cross sectional and
part details.
Suction strainers 3.3.5
VTPs can also be fitted with strainers [316] to prevent
foreign particles from entering the pump. The type of
strainers and the mesh size depends on the
application. Examples are shown below. Strainers
are fastened [422] directly to the suction bell [55] or
attached using clips [421]. Cone shaped strainers
are provided with internal or external threads to
attach it to the main assembly.
a) Slip-on strainer
b) Clip-on strainer
c) Cone (threaded) strainer
SUCTION BELL (55)
CLIP
(421)
CAP SCREW (422)
STRAINER (316)