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.

You have asked a question that is too broad to answer here.
This is not some new requirements, though depending on your location they may just be coming into play.

We had fugitive emission test that were require by the Federal, State and Local Authorities.
If you could come back with some more specific areas of interest I'm sure someone will steer you in the right direction.
A case in point at my plant is we use cyclohexane and for several years there were no measurements of emissions so we counted flanges and valves using an assigned value for each. This went on until they raised emissions per flange or valve and lowered the allowables.  There was a concerted effort to actually measure the emissions to argue for a reduced penalty.  Though not directly involved I know there was considerable discussion as to whether any method was acceptable to all parties.

If you could come back with some more specific, piping, tanks, etc/ball vave., areas of interest I'm sure someone will steer you in the right direction.

If this Fugitive emmision test is to detect leak from the flange connections and from gland area of the valve, is it prudent to carry out this test at the manufacturer's place.

Would it not be a dangerous assumption to think that once it is tested at the manufacturer's works it would not leak (give Emmissions) during service. While installing if the person does not tighten the flanges to Helium teight instead, if he tightens upto hydro leak tightness, then do we not defeat the whole purpose.

From what i have gathered here, while procuring the flanges we need not insist for this test as a specification requirement, but should check for (some thing like type test) proof that the design of the vlave and the manufacturing facility/method and also get a compliance/guarantee from the manufacturer that the valves will pass the emmisision requirement or specify the flange face flatness requirement along with strict face finish requirement instead of asking for He leak test. 

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