Can some one provide the standard/Spec which specifies Fugitive Emmission Test Requirement and Test Method?

Also i would like to know under what circumstances the above test is called for.

Is this test a recent development. Some how in the last 13 years of my inspection experience i have not come accross and now suddenly many people are talking about this.

Basic/simple Emmission tests on Valves(gate valve) are usually tested after all other tests have been carried out i.e. Body, seat etc
 The test media is usually helium and a sniffer (mass spectrometer) is used to detect any leaking helium.
This is generally treated as a QC function as you imply.

TUV have an emmission test namely LUFT which can be witnessed and certified against.
 There are other more stringent commercial standards and specifications, especially within the petrochemical industry 'Shell' have a very difficult test as it involves cycling the valve and temperature cycling as well.
 I won't go into further detail as it is probably unnecessary to do so.

Just to make sure we all have not misled you.
Shell 77/312 has a title of 'INDUSTRIAL VALVES:FUGITIVE EMISSIONS MEASUREMENT,CLASSIFICATION SYSTEM,QUALIFICATION PROCEDURES AND PROTOTYPE AND PRODUCTION TESTS OF VALVES'.
 This specification involves not only emmission testing but temperature and valve cycling.  The spec exists for 'proto-type approval' and 'production acceptance' testing. Therfore no one part can be taken on its own i.e. leakage rate. As the specification is far more involved and compliance is with the specification as a whole not any of part thereof.

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