RTJ Gaskets

The principle applied in the leaktest is based on pressurizing the annual space above and below the seal ring, using nitrogen gas. If no pressure loss is experienced in this pressurization, the seal is deemed tight. The test pressure is applied to the annular space by drilling a hole trough the flange into one of the annular spaces. Pressure can be equilibrated between the annular spaces by drilling a hole through the seal ring from the upper to the lower annual space.

Also, there will be savings in the volumes of nitrogen/helium used since the test requires only a tiny amounts of gas. 

The method is new and will be able to provide a quick and effective control as to whether the flange connection is intact before the flange receives system pressure. This will offer large safety benefits. The risk of leaks after maintenance actions will be reduced. Experience shows this to have been a safety problem. It will also offer major economic savings since the test method is significantly faster than traditional leak testing. Production can recommence faster after a maintenance action.