Water Conservation on Rotating Equipment, 1998 Engineering Conference Proceedings

Current packing and flush water control arrangements on rotating equipment typically use large quantities of water. These flow rates are often uncontrolled. Studies done illustrate flush water use on two different types of packing arrangements.

Reducing water use on rotating equipment can negatively impact equipment reliability. High flow rates will mask any inadequacies in the packing currently used. Packing material and construction becomes much more critical when flush flow rates are reduced or eliminated. Quick break in and long term leakage control are two critical attributes packing requires to function well at reduced or zero flush rates. Tests were developed to easily illustrate these two attributes.

New braided packing fibers and construction allow for reduced water consumption. Injectable packing with low heat generation allows for zero water consumption. Testing methods are used to illustrate their performance and field testing is described. Use of a centrifugal force device as an ancillary device is also discussed.

Single mechanical seals have been developed to run flush-free in stock service up to 3%. The use of single or split mechanical seals with an advanced throat bushing / expulsion device offers reduced or zero water consumption in a variety of mill applications. Dual mechanical seals with proper environmental controls offer water conservation in more severe services.