The standards in object have been recently promoted from the "Committee Draft" (CD) to the "Draft International Standard" (DIS) status and, although still under development and at an inquiry stage ("40.60 - Voting summary dispatched"), they are now available for public purchase (with a price of 64 CHF each). However,we have recently worked with one of our customers to achieve CC2 with tightness class B on a control valve, with quite a high temperature. For block gate valves then again a reasonable result should easily be possible with care in set-up. I have recently seen customers / constructors request test data based upon this standard but with "extensions" and modifications to the requirements (everyone is suddenly an expert...) and that rather ruins the point of the standard in the first place. Another thought - you mention chlorine valves - remember that with fugitive emissions we are looking at VOC's (hydrocarbons) - I don't know whether the Eurochlor folks have any similar requirements in terms of leak measurement. Also, most refinery valves are below 3" N.B., but the larger valves are statistically more likely to be found leaking - think of stem tapering effects during thermal cycling etc. (I have done quite a lot of LDAR work over the years as well...) Thus, choose your sizes carefully.

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