11 | IM-112 DECEMBER 2019
Vertical Turbine Pumps
2001299 - VTP- IOM
11 | IM-112 DECEMBER 2019
Vertical Turbine Pumps
2001299 - VTP- IOM
11 | IM-112 DECEMBER 2019
Vertical Turbine Pumps
2001299 - VTP- IOM
Vertical Turbine Pumps
General Information and Description
Document Name: 2001299-VTP-IOM-EN Page 11 of 67
Revision 3 Copyright © 2014, Weir Floway, Inc. All Rights Reserved. Issue Date: December 12, 2014
3.3.1 Drivers
A variety of drivers can be used; however, electric motors are most common. In this manual, electric motor
drivers are grouped into two categories:
1. Hollow Shaft Drivers: where the pump shaft extends through a tube in the center of the motor shaft and
is connected to the driver by a clutch assembly at the top of the driver.
2. Solid Shaft Drivers: where the motor shaft is solid and projects below the driver mounting base. This
type of driver requires an adjustable coupling to connect to the pump.
3.3.2 Discharge Head Assembly
• The discharge head supports the driver, column, and bowl assemblies in addition to providing a
discharge connection (the type VU discharge connection is located on one of the column pipe sections
below the discharge head).
• A shaft sealing arrangement is located in the discharge head to seal the rotating shaft where it passes
from the stationary housing (liquid chamber). Typically, the shaft seal is either a mechanical seal
assembly or a packing box.
3.3.3 Column Assemblies
Column assemblies are of two basic types, either of which can be used on vertical turbine pumps:
1. Open Lineshaft Construction: utilizes the liquid being pumped to lubricate the lineshaft bearings.
2. Enclosed Lineshaft Construction: has an enclosing tube around the lineshaft and utilizes oil, grease or
injected liquid (usually clean water) to lubricate the lineshaft bearings (not used on barrel pumps).
Column assemblies consist of the following:
• Column Pipe: which connects the bowl assembly to the discharge head and carries the pumped liquid
to the discharge head. Column pipe is either threaded or flanged.
• Shaft: which connects the bowl shaft to the driver; and may contain bearings if required for the
particular unit.
• Enclosing Tube (if applicable): surrounds the lineshaft to contain the supplied lubrication.
3.3.4 Bowl Assemblies
The bowl assembly consists of the following:
• Impellers rigidly mounted on the bowl shaft which rotate and impart energy to the fluid.
• Bowls to contain the increased pressure and direct the fluid.
• Suction bell or case which directs the fluid into the first stage impeller.
• Bearings located in the suction bell (or case) and each bowl.
A separate instruction manual is available which provides construction details and repair instructions for
Floway bowl assemblies.
3.3.5 Suction Vessel
The suction vessel may consist of a barrel with or without suction fitting, to connect to customers piping
arrangement, or a storage tank with suitable opening to mount the pump.
Whatever the arrangement may be, it must provide:
• Adequate support for the unit
• A means of supplying the pump with liquid
NOTICE
Some units do not require a column assembly, as the bowl assembly is connected directly
to the discharge head.
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