Seals

Latest Seals Articles

Mechanical seals consist of a rotating element and a stationary element, each with a lapped, precision-smooth mating face (see Figure 1). Seal performance is determined primarily by the condition of the faces and the pressure applied to them. Other key factors are vibration, heat and pumpage characteristics.

Sealing systems can play a vital role in equipment performance and are considered critical components in the validation process of a design. Engineers should closely examine the sealing systems used in their equipment, because they do everything from preventing seal leakage and extending hydraulic cylinder life to lowering dynamic friction and controlling hydraulic motor position.

The addition of five new styles of rubber expansion joints (REJs) within the Fluid Sealing Association (FSA) technical handbook has increased the opportunities for the selection and application of REJs.

Persistent maintenance and unacceptable odor prompted a Southwest wastewater treatment plant to replace its sludge-handling system with progressive cavity (PC) pumps.

The Gasket Division of the Fluid Sealing Association (FSA) and the Flange Gasket Division of the European Sealing Association (ESA) have been jointly working on a complete revision to existing gasket handbooks and associated documents for the past three years.

Compression packing has been around since the beginning of the industrial revolution and is still used extensively in types of equipment in which a stuffing box seal is required to prevent loss of process fluids to the environment. While advanced sealing solutions for rotary applications, such as mechanical seals, emerged over time, compression remains an important industrial tool.

Q. What principles drive the pumping action in a controlled-volume metering pump?

A. The pumping action is developed by a reciprocating piston. This reciprocating motion develops a flow profile represented by a sine wave. Actual rate of flow is determined by the following formula:

The phrase “It’s just a small leak” is rarely found in the vocabulary of any maintenance manager, pump operator or pipefitter.

A fact of life is that equipment operators spend more time with pumps than mechanics do. Leveraging this familiarity with equipment, operator-driven reliability (ODR) programs focus on maximizing plant reliability by enhancing the techniques operators use to monitor the equipment for which they are responsible.

Rubber expansion joints are used in piping installations to compensate for thermal growth, relieve piping stress during operation, and reduce vibration and noise caused by rotating equipment. While a rubber expansion joint can compensate for pipeline misalignment, this compliant product has installation and operational limitations.

Columns

For those of you old enough to remember Lawrence Welk, you’ll notice that the title of this brief column is the final quote from his show’s closing song. I am still a loyal fan of his reruns today.

A reciprocating power pump, as depicted in Figure 1, is a displacement machine. It has characteristics that are different than a centrifugal pump.

Blogs

Cahaba Media Group

See also:

Upstream Pumping

© Copyright Cahaba Media Group 2015. All Rights Reserved. Privacy Policy