Abstract
Gaskets have been used for many years to disrupt the electrochemical pathway between anodes and cathodes in bolted joints. However, the gasket must maintain its primary objective which is providing a leak tight seal, while being electrically insulating.
Many of the most commonly used gaskets for critical service are semi metallic, that is, spiral wound gaskets, Kammprofile gaskets etc. These products are excellent at providing a leak tight seal, when well designed, but being largely metallic they allow charges to conduct between flanges in the bolted joint.
Non-metallic gaskets such as those based on phenolic and glass reinforced epoxy (GRE) have been used since the 1930s, but have some downsides. Especially their reliance on the non-metallic material for mechanical strength. Also, the common reliance on a narrow line seal. This particular characteristic can be an issue on flanges that are not new and may have some signs of damage.
This paper will introduce a new type of electrically isolating gasket that does not compromise sealing best practices. Its design will allow some interchangeable compounds that will ensure good resistance to various types of media, all while retaining the tightest of seals and electrical integrity.
Data will be presented from a range of sealing tests and common industry standard tests such as the API 6FB fire test demonstrating the suitability of this gasket in a wide variety of situations.
