This month's "Sealing Sense" was prepared by FSA member Larry Sheffield.
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Gasket stress is a term commonly used to describe the unit load on its surface. It is one of the most important parameters of a bolted joint because it directly impacts the ability of the gasket to seal.
Typical operating environments create unique challenges for plant maintenance personnel when meeting their goals of reliably sealing bolted flange connections.
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.
For months, the focus of the Pumps & Systems "Efficiency Matters" column has been on pump design, installation and operation, factors that directly affect the energy consumption of the pump itself. For example, the April and May 2010 articles on pump performance bands discussed how normally, when a positive displacement pump has less slip, it will more efficiently pump the fluids. The amount of product pumped per unit of energy used would be considered a direct measure of efficiency.
The purpose of this article is to show the importance in selecting the appropriate fastener standard and specification.
Why don’t my PTFE gaskets seal FRP, plastic and other light load flanges?
As we learned last month, carbon/graphite fiber packings have proven to be effective solutions to many common sealing applications. This time, we have learned that flexible graphite packings appear to have become the packings of choice when sealing fugitive emissions, high heat media, and rotating equipment with limited cooling or flush available.
"How long will I be able to run my equipment before it has to be taken down for servicing?" is a question often asked when a buyer or user decides to purchase a new pump, agitator, or other type of rotating equipment.
Latest Seals Articles
The focus has been on the main source of the emissions—valve stem packing. Several companies have evaluated current industry standards and have crafted testing protocols specific to their application requirements.
How does FSA’s role in standards development affect the pump and seal industries?
Dry fasteners provide secure attachment without personnel safety and
environmental issues.
Why are mechanical seals still the preferred choice in the process industries?
Many factors must be considered when making this important decision. Third of Six Parts
Proper seal choice is critical for optimal compressor operation.
What should be considered for the selection of expansion joints for pumps?
Power plant slashes maintenance time and labor costs dramatically by switching to split design mechanical shaft seal.
Why don’t my PTFE gaskets seal FRP, plastic and other light load flanges?
Find a reliable dry gas seal system for any application.
First of Six Parts
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Columns and Blogs
The performance of a centrifugal pump with a trimmed impeller will follow the affinity laws as long as that trim is relatively small.
Standards for repair will begin with a standard for vertical turbine pumps.The pump industry is undergoing renewed interest in the technical aspects and quality of repairs.
Charlie Jackson was unaware of any centrifugal pump manufacturer that knew how to calculate hydraulic axial thrust produced within liquid ends of their pumps.
