A Closer Look at Different Types of Gaskets and Their Shapes and Construction
Gaskets work as a mechanical seal that is utilized for filling the space between two surfaces and prevent leakages. The type, as well as the gasket's structure, varies as per operating conditions of the heat exchanger. Let us delve deeper and understand other details about gaskets in the following sections.
Gaskets – Types, Shapes, Construction
Gaskets can be of different types ranging from double/single jacketed to plain metal, corrugated, soft and several others. In addition to it, since these are available in different materials, it allows the heat exchanger to function at higher temperatures.
Let us now go through some of the advantages of using gaskets
Advantages of Using Gaskets
- Most of these are custom made, which means there are hardly any limitations with respect to their shape and size.
- There are metal jacketed ones that apart from providing mechanical strength for containing the filler also help in improving chemical resistance.
- Their unique construction provides them required stability as well as ensures a hassle-free installation.
You will find them being used mostly in heat exchangers of shell and tube type as well as constructed without or with bars. The primary seal is present within inner diameter while external diameter functions like a secondary seal. The purpose of the bars is to seal the passages in the heat exchanger. Oftentimes, gaskets are also manufactured in alloy or metal with a soft core that is present in a metallic jacket.
In the following sections let us check the different types of gaskets that you can choose from.
Types of Gaskets
Gaskets Having Integrated Bars: Normally, double jacketed gaskets used in heat exchangers have integrated bars.
Gaskets Having Welded Bars: The good thing about these gaskets is that they are able to eliminate the main problem conventional gaskets face of cracks in radius. Here, the secondary, as well as primary seals, tend to be continuous and fully encompass the gasket. Additionally, these have excellent sealability which means there are fewer chances of a leak. Moreover, bars that serve the purpose of sealing between the passages are TIG or plasma welded having spot welds at all the ends. Additionally, the welds are kept small and soft so as to avoid locations with increased resistance to sealing.
It is worth mentioning here that if it is a gasket having 1000mm of external diameter then it is manufactured with integrated bars. On the other hand, if the external diameter is more than 1000mm then such gaskets are constructed with welded bars.
Spiral Wound Gaskets: These are manufactured to have one or higher number of metal jacketed bars of different shapes. In addition to it, these metal jacketed bars are of the same material that spiral windings are made up of. They have a standard thickness of 6.5mm, 4.5mm, and 3.2mm.
As we can see, there are different types of gaskets
you can choose from depending on your requirements and kind of heat exchanger they are to be used in.