Seals

A major concern of U.S. petroleum refineries and chemical process plants is regulatory compliance.
Understanding how labyrinth seals function is imperative to ensure the appropriate seal technology is specified. Seal selection, when matched appropriately to the expected application and environment to which the equipment will be exposed, will directly impact seal life, productivity and total maintenance costs. Armed with this knowledge, users are encouraged to work with seal manufacturers to match seal technologies appropriately with application needs.
As we learned last month, carbon/graphite fiber packings have proven to be effective solutions to many common sealing applications.
Many factors must be considered when making this important decision. Third of Six Parts
This discussion opens a three-part series covering mechanical seal piping plans that provide guidelines for various seal arrangements, fluids and control equipment to help you determine what support system requirements will maximize the performance reliability of your application.
Conclusion of our series covering applications in which they are used, why they are used, how they fail and things operators can check/do to maintain the performance of the seal flush plan.
Plan 12 is similar to a Plan 11. The flush is taken off of the pump discharge, or and intermediate stage in the case of multiple stage pumps, through a strainer or filter to remove solids, and then through an orifice to control flow, before being introduced into the seal chamber.
Couplings play a critical role in wastewater processing. Take a look at how one wastewater facility combated coupling failure from exposure to UV radiation.
Whoever coined the phrase "Don't sweat the small stuff" was likely not an engineer. Everything engineers do is ultimately defined by the success of "the small stuff" that comprises the larger design projects.
Advances in diamond are bringing the well-known properties of the world's hardest material to mechanical shaft seals. Diamond has long been sought after as a seal face material because of its unsurpassed hardness, high thermal conductivity, chemical inertness and low friction. Due to the processing limitations of synthetic diamond, however, early applications were relegated to abrasives and tooling that do not require the same high quality surface finishes and tolerances as those found in mechanical shaft seals.
Most shaft seals are typically placed in bores made of steel, cast iron or other common ferrous metallic material. These ferrous, or iron-containing materials, are compatible with both metal cased and rubber covered seals.
Find a reliable dry gas seal system for any application. First of Six Parts
The mechanical seal industry, like the pump industry, will continue to face significant opportunities as well as challenges as we progress further into the globalized 21st century.
The amount of product pumped per unit of energy used would be considered a direct measure of efficiency.
Avoiding seal leakage or failure is a complex task for pump designers and one that must be taken seriously in difficult economic times when reducing downtime is critical. New developments in elastomer materials and seal design techniques mean that pump engineers can avoid seal leakage and ensure optimum performance in demanding operating environments involving high and low pressures and temperatures.
Since metal bellows products vary greatly in what they are able to offer, it is important to understand the benefits and trade-offs as they apply to your particular operation. Be sure to review your applications and select the metal bellows seal best suited to help you extend meantime between repair, standardize inventory and increase reliability.
The FSA is actively participating in the task groups on the fourth edition of the API-682/ISO 21049 and 3A Sanitary Standards for mechanical seals.
Using an evaluation and selection process, plant operators have been able to increase their mean time between repairs (MTBR) from less than one year to more than three years.
How does FSA’s role in standards development affect the pump and seal industries?
Initial costs and life cycle costs affect which sealing method is chosen for an application.
All three API Plan 53 versions are intended to isolate the pumped product from the atmosphere and create a favorable artificial environment for the mechanical seal.
How can I apply expansion joints to plastic and fiberglass reinforced piping?
How do I evaluate and control my fluid sealing costs?
When seal designs are applied to abrasive slurry applications that properly address the five design considerations noted above, mechanical seals can provide very reliable sealing performance.

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