Latest Seals Articles

Maintenance personnel usually dislike rotary seals. This is because replacing a low-cost oil seal requires dismantling a whole piece of equipment.

Pump manufacturing companies have made strides in improving design, efficiency and energy usage in recent years through developments in impeller profile and the use of optimized motors and variable frequency drives. All of these changes enhance end users' bottom lines by reducing energy costs.

In the U.S. and abroad, governments, regulators and third-party activist groups are considering policies and actions that could have implications for the sealing device industry. The passing of the Clean Air Act in the early 1990s was a watershed moment for the industry.

Dry containment seals provide enhanced safety and control of emissions. When coupled with the appropriate piping plans, they can provide early detection of sealing performance deterioration and trigger an alarm if the seal fails.

Climate has an often ignored impact on sealing systems. Damage from harsh weather conditions, such as intermittent storms or humidity, can be effectively managed. But daily exposure to the outdoors, especially where extreme temperatures are the norm, can wreak havoc on seals.

Gaskets are crushed more frequently than many end users realize. Some maintenance professionals claim that is all they see when they separate a leaking flange. Many simply replace the gasket rather than investigating the cause of the failure in depth.

Performing maintenance tasks correctly the first time has become increasingly important to end users. Today’s end users are tasked with doing more work with less time, fewer resources and smaller staffs while responding to the increase in environmental and other equipment-related pressures.

The criteria for expansion joint selection for fluid piping applications focuses on the expansion joint’s quality, durability and capabilities. To ensure that the rubber expansion joint’s installation provides optimal service life, operators and maintenance personnel must consider specific conditions and take a systematic approach.

Many associations, societies and regulatory agencies have rewritten and redeveloped emissions and leakage standards and controls year after year.

Many associations, societies and regulatory agencies have rewritten and redeveloped emissions and leakage standards and controls year after year.


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.

Part 1 of this series (Pumps & Systems, March 2015) discussed what happens to a boiler feedwater (BFW) pump during plant transients.

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


In today’s high-volume pumping applications, energy efficiency and cost control are more important than ever.

Last month's column (Pumps & Systems, February 2014) reviewed the pump selection process and described how many users oversize pumps by adding design margins to account for unknown conditions present during the pump specification process.

Cahaba Media Group

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Upstream Pumping

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