![]() ![]() The reason for this is that thinner materials present a surface area (the smallest ID, or inner diameter) for pressure to act upon, and so are less likely to fail. Gasket Material Thickness & PressureĪs a general rule, the thinnest possible gasket material for the application should be chosen. Where required we can supply material or parts with batch and cure dates, so that customers can be sure to only install gaskets that will not fail due to perishing material. In critical application it is important to ensure that rubber based material is used within its shelf life. Generally, rubber based materials have a shelf-life of seven years. As a material decays or becomes brittle or soft, the stress relaxation of the material is compromised and so is its ability to withstand pressure. The performance of the gasket is directly related to the stress retention of the gasket material. Below are some of the conditions affecting the pressure to which a gasket will be subject and how the gasket is likely to act under load. The main factors that need to be considered when specifying a gasket are temperature, chemical resistance, and pressure.Įven in the same environment, gaskets can be subject to different operating conditions. Gaskets need to perform in many different conditions, which is why there are a huge number of gasket materials and configurations to choose from. To continue to maintain a seal the pressure from compression on the gasket must be greater than the internal pressure by some multiple, depending on the gasket type and level of tightness required. The gasket itself is also subject to a side loading, where the internal fluid pressure can cause the gasket to extrude through the flange clearance space. Under operating conditions this pressure is relieved by internal pressure which acts to separate the flanges. To maintain seal integrity pressure must remain on the gasket surface to prevent leakage. The gasket either encompasses the bolts (called a full faced gasket) or sits inside the bolts (known as an IBC or ring type gasket). Gaskets are typically fixed by bolts under load around the flange face. Pipe and Flange Construction and Gasket Pressure The selection of suitable gasket materials must be considered together with the flange design bolting and materials of construction. Conversely, as the pressure decreases a higher temperature can be maintained. As pressure increases the temperature that the flange will maintain falls. ![]()
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