AWWA E101:1988 pdf download.VERTICAL TURBINE PUMPS- LINE SHAFT AND SUBMERSIBLE TYPES
A-2.2.1 The pump bowl assembly is either a single or multistage, centrifugal or mixed-flow vertical pump with discharge coaxial with the shaft. It has open, semi- open, or enclosed impellers. Assemblies are constructed for use with either open or enclosed line shafts.
A-2.2.2 The column-and-shaft assembly consists of the column pipe that suspends the pump bowl assembly from the head assembly and serves as a conduc- tor for the fluid from the pump bowl assembly to the discharge head. Contained within the column pipe is the line shaft, which transmits the power from the driver to the pump shaft. The line shaft is maintained in alignment throughout its length by means of bearings and may be enclosed in a shaft-enclosing tube and generally lubricated with oil, or it may be open and lubricated with the fluid that is being pumped.
A-2.2.3 The head assembly consists of the driver, the base from which the column-and-shaft assembly and the bowl assembly are suspended, and may include the discharge head, which directs the fluid into the desired piping system.
A-2.2.3.1 The driver is the mechanism mounted on the head assembly that transmits or furnishes the power to the top shaft. It may contain the means for im- peller adjustment, and it provides a bearing to carry the thrust load. It may or may not be a prime mover.
A-2.2.3.2 The discharge tee, in a discharge-below-base installation, is separated from the head assembly and installed in a column pipe at a desired distance below the head assembly.
A-2.3 Driver: For purposes of this standard, a driver may be defined as a device used to provide mechanical energy for the operation of a pump. Types of drivers are defined as follows:
A-2.3.3 The vertical hollow-shaft right-angle gear drive is a gear mechanism having a shaft that has been bored on the center of its axis to receive the top shaft of the pump. The horizontal shaft of the gear drive receives its power from the prime mover and, through a pair of bevel gears, transmits it to the top shaft. Im- peller adjustment is made at the upper end of the gear drive, and a means to carry the thrust on a bearing within the gear drive is provided.
A-2.3.4 The vertical hollow-shaft belted drive is a flat- or V-belt-driven mechanism having a shaft that has been bored on the center of its axis to receive the top shaft of the pump. Impeller adjustment is made at the upper end of the belted drive, and a means to carry the thrust on a bearing within the belted drive is provided.AWWA E101 pdf download.