manhole gasket

Manhole gaskets are among the most frequently used components of boilers to ensure proper sealing. This mechanical seal is placed between two or multiple mating surfaces to prevent leakage risk. Leakage is the biggest concern in the boilers industry. Thus, no compromise in gasket quality should be tolerated. An ideal manhole gasket is expected to be resistant from:- 

  • Extremely fluctuating temperature levels 
  • Chemical impact 
  • Acid damage 
  • Alkaline reaction

A boiler comes with multiple manhole doors to gain inside access. Their size vary among residential and commercial models. They are usually located on steam and water drum. Both of these areas are prone to high pressure. In order to provide superior level leakage protection, manhole gaskets are manufactured with three different types of materials mainly. We will elaborate on their properties below. 

Ideal materials for manhole gaskets 

  • PTFE

This gasket’s material features a unique fibrous structure. This gives outstanding chemical and thermal resistance. Because the material is steam-resistant, these gaskets are ideal for use in steam boilers. The possibilities with PTFE manhole seal are unlimited.

  • Rubber 

Any rubber grade can be used to create rubber manhole gaskets. Different shapes of gaskets are available. Also available in huge sizes. The manhole seals can be used in a variety of industries, including nautical and offshore. However, heated water installations, dryers, and hot air systems are also examples.

  • Graphite

This gasket is constructed entirely of braided stretched pure graphite, free of binders and fillers. This gasket performs well in high-temperature applications (up to 450°C). The material is also chemically resistant. Moreover, gasket of this material  is inexhaustible.

These materials are customized into gasket with the help of die cutting and digital cutting processes. While buying gaskets for your boiler inventory stock or immediate replacement, keep some important things in mind. Have a look below. 

Buying Guide

  • Temperature resistance 

The kind and substance of a gasket are directly affected by extremely low or high temperatures. As a result, temperature fluctuations should be determined as well. All materials will be subjected to additional stresses as a result of contraction and expansion.

  • Compatibility

The size and number of bolts in the gasket, as well as the gasket’s dimensions, are some of the basic aspects such as thickness, pipe size, diameter, etc.. All of these can be provided by your engineering team, and the gasket maker will request any further necessary specifications.

  • Pressure endurance 

The level of stress acting on gaskets is crucial in determining the material to be utilized. The materials utilized and whether the gasket need to deform are both determined by the downward pressure. Still, the level of stress applied to the equipment/pipe from the outside (or inside) is more essential.

  • Longevity 

A gasket for a part that is periodically serviced is not the same as a gasket for a part that is sealed and completely operational over several years. As a result, the longevity of gaskets is critical.

Now that every aspect of manhole gaskets is clear, you can make the best buying decision clnveniently. Just do your research on brands carefully.