Sizing Of A Plastic Chamber With
Air-filled Balls For Water Hammer Control
Author(s)
A. Al-Khomairi & S. Ead
Abstract
Water hammer in pipelines and pipe networks can result in pipe and equipment
failures and economical/environmental losses. The use of a piece of flexible
plastic pipe for water hammer control is discussed and experimental data for the
use of such a device are presented. The device, referred to as a plastic chamber,
reduces pressures resulting from water hammer. The flexibility of the plastic
chamber allows radial expansion of its walls under pressure to accommodate the
excess fluid and thereby reduce water hammer-induced pressure spikes. To
enhance the performance of the plastic chamber, air-filled balls are inserted into
the chamber. When a sudden pressure increase takes place, the air-filled balls
shrink to reduce the pressure surge. Previous experimental data on the use of the
plastic chamber and the air-filled balls (inserted in a rigid chamber) are analyzed.
The effect of the plastic chamber on the reduction of water hammer was
formulated as a function of a dimensionless parameter related to the plastic
chamber and the pipe for which water hammer is to be controlled. Furthermore,
the effect of the air-filled balls was formulated and found to be a function of an
analogous dimensionless parameter related to the volume/inside pressure of the
balls and pipe parameters. The two effects were combined in an empirical
formula for the total reduction of water hammer when using a plastic chamber
with air-filled balls. The procedure allows the required water hammer reducing
device to be sized to achieve a target reduction of water hammer based on the
parameters of the pipe, the plastic chamber and the air-filled balls.
Keywords: unsteady pipe flow, water hammer control, surge pressure control,
water hammer damping.
Keywords
unsteady pipe flow, water hammer control, surge pressure control,
water hammer damping
Related Book
Other papers in this volume
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