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A Basic Introduction to The Spiral Wound Gaskets
Posted: Aug 10, 2021
The spiral wound gasket is one of the most common metallic gaskets that is used in industrial plants. Basically, it is used as a type of seal placed between the two surfaces that helps in reducing the risk of leakage. This gasket was first developed in the early 20th century. The main reason behind developing it was the challenging conditions people were encountering in oil refinery operations.
Basically, there are different types of gaskets available out there, such as metallic ones, non-metallic, and semi-metallic. Spiral wound gaskets are made to be used in high pressures, chemical attacks, and extreme temperatures. These gaskets are flexible and can recover if there are temperature and pressure changes across the flange face. The spiral wound gaskets are used in a number of industries, including pharmaceuticals, engineering sectors, aerospace, and brewing.
Elements of a spiral wound gasket
There are basically three major elements of a spiral wound gasket - outer ring, inner ring, and sealing element.
Outer ring
The outer ring of the spiral wound gasket is sometimes also called the guide ring or centering ring and is made using carbon steel. It gets its name from the function it performs. When you insert it into a bolted flange joint, it helps to center the gasket.
Inner ring
An inner ring holds great significance for the gasket because it is used to prevent any kind of buckling of windings inside the pipe.
The parts of a gasket are sucked into the pipe it buckles. Then, the pieces of the gasket will keep flowing through the pipelines as long as they are not caught on something. The chances are that they will get wrapped around a pump or other rotating equipment. All of this leads to the mess, which is called a "bird’s nest." The main function of inner rings is to help in avoiding this problem.
Sealing element
As the name suggests, a sealing element is used to create a seal to prevent any leaks. It surrounds the windings as well as the filler material. Most often, a flexible graphite filler material that can tolerate high temperatures is used in spiral wound gaskets in oil and gas refineries.
So, here you have it, a basic guide to spiral wound gaskets. These gaskets are mainly helpful in preventing any form of leakages in the refineries. The biggest advantage of these gaskets is that they can withstand high pressure.
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