Continuous measurement of flange connection leakage rate with seal to atmosphere e.g. for gas pipes

摘要

The method has the leakage fluid flow entering a measuring chamber, which is formed by a ring mounted around the flange or a collar positioned around the flange. In addition an inert gas flow is introduced and mixes with the leakage fluid flow. Also the vol. flow of the inert gas/leakage fluid mixture and the concn. of the leakage fluid in the mixture or in a part amount of the mixture is measured, and from this the rate of leakage. With the measurement in an atmosphere loaded with the measurement gas, an encapsulation is provided for the flange connection, to which the inert gas with a small gauge pressure is supplied. A complete sealing of the capsule is not necessary.