What kind of fugitive emission testing are you doing? testing a packing, testing a gasket? or testing packing in a ball valve?
API 622 provides details on how to build a test fixture to test packing.
As far as testing valves unfortunately there is no one standard. I would try and get a copy of either chevron's fugitive emission testing procedure Or Lion Oil's those two specs are the most harsh I've seen and if you pass those you many companies (not all) will accept it.
API 622 is currently in revision and one of the items on the agenda was to add a method for testing valves. However at the last API meeting this section was removed. They may release as a separate API standard but I have no idea what time frame that would be.

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