Tag Archives: Sealing Sense

Mechanical Seals Division – FSA Annual Meeting 2017

The Mechanical Seals Division will be meeting on October 26 in Fort Worth, Texas. Discussion topics include upgrades to the Life Cycle Cost tool, including a new pump version. Updates will be given on the new KnowledgeBase and development of new content. This division is involved in activities in the STLE, BHRG, KCI Pump Summit, and the Turbomachinery Technical Conference. The FSA’s Technical Director, Henri Azibert, will lead a discussion on FSA and Hydraulic Institute joint webinars, Pump Summit presentations, Texas A&M Pump Symposium short courses, and opportunities to partner with API. Mr. Azibert will also present updates on other industry standards related to this division.

Overview of Multiple Lip Seals

Multiple lip seals are commonly used in centrifugal pumps and positive displacement pumps. There are many variations, but one version that has been particularly effective is a triple lip seal arrangement. The key feature is the third outboard lip seal element, which can be used for several functions.

Sealed media can be compartmentalized, providing the opportunity to apply any of the API piping plans based on the type of media being sealed. For instance, it can serve as an excluder or a secondary seal in a quench gland design for media that crystallizes or hardens with exposure to ambient temperature and pressure. Unlike a mechanical face seal, there are no rotating parts, and all internal components are not just replaceable, but replaceable on-site by in-house or field maintenance staff.

Click here to read more.

Back to Basics: Semi-Metallic Gaskets

This is the second of two articles in this “Back to Basics” series that discusses gasketing. While the first article was on soft gaskets, this article will focus on semi-metallic gaskets.

Many variations of semi-metallic gaskets are available. In general, the combination of metal and a soft material merges the structural integrity of the metal with the sealing ability of the soft material. Common variations include corrugated, jacketed, kammprofile and spiral-wound gaskets.

Corrugated gaskets consist of a thin metal that is corrugated or embossed with concentric rings and faced with a soft material such as flexible graphite.

Corrugated gaskets use the substrate’s geometry to achieve conformability to flange irregularities and promote recovery over the life of the seal; they are essentially a line contact seal.

Click here to read more.

What to Consider When Upgrading or Changing Pre-Specified Gaskets

Users at some point in their gasketing careers will have to consider alternative gaskets (styles and/or manufacturers) to replace those currently approved and installed at their facilities.

Before they can evaluate the gaskets, they must ask, “Why do I need or want to change my gaskets?” The answers will vary depending on the person, department, facility and corporate environment.

One individual’s specific “why” may be different from another’s within the same company, even if they have access to the same information. But only once the “why” has been established can the “what” to change be considered.

Click here to read more.