Thicker gaskets, in general, are not better, and I would recommend using thinner gaskets whenever possible. There are several reasons for this recommendation.
Firstly, thinner gaskets can improve the performance of a joint by reducing emissions. Thicker gaskets may not conform as well to the mating surfaces, leading to gaps and leaks. Thinner gaskets, on the other hand, have a better chance of conforming tightly to the surfaces, minimizing the potential for leakage and reducing emissions.
Secondly, thinner gaskets can help lower product loss. In applications where the joint is used to contain fluids or gases, a thicker gasket may require more torque to achieve the required compression. This increased torque can result in deformation or damage to the gasket, leading to potential leaks and product loss. Thinner gaskets, requiring less torque, are less likely to suffer from such issues and can help minimize product loss.
Furthermore, thinner gaskets often exhibit better blowout resistance. Thicker gaskets can be prone to blowouts under high-pressure conditions due to their increased volume and potential for deformation. Thinner gaskets, with their lower volume and better ability to conform to the joint, can offer improved blowout resistance and prevent costly failures.
It is important to note that the suitability of gasket thickness depends on the specific application and the operating conditions involved. Thicker gaskets may be necessary in certain cases, such as when sealing large gaps or in applications requiring higher levels of compression. However, in general, thinner gaskets offer several advantages that make them preferable whenever possible.
In my experience, I have come across instances where the use of thicker gaskets has led to issues such as leaks and blowouts. In one particular situation, a thicker gasket was chosen for a high-pressure joint, assuming it would provide better sealing. However, during operation, the gasket deformed under the pressure, leading to a blowout and significant downtime for repairs. This experience reinforced the importance of considering the appropriate gasket thickness for each application and the benefits of opting for thinner gaskets where feasible.
To summarize, while thicker gaskets may have specific uses, in general, I recommend using thinner gaskets whenever possible. Thinner gaskets offer improved performance, including reduced emissions, lower product loss, and increased blowout resistance. However, it is crucial to assess the specific requirements of each application to determine the most appropriate gasket thickness.