Which Valve Manufacturers have been qualified in accordance with Shell SPE 77/312 Fugitive emissions specification?  And for which ball valves have they been qualified?
The Shell MESC SPE 77/312 "additional requirement" specification has been revised frequently in the last years(I collected 8 different revisions between 2000 and 2002). The Thightness Classes (A, B and C) and the relevant limits remained substantially untouched, while the Endurance and Temperature Classes, test pressures, archiving and range qualification rules, etc. slightly changed each time (resulting sometimes in sensible changes, at the end.
The latest and apparently more "stable" version is dated November 26th, 2002: although this type of testing (both "production" and "prototype") is becoming almost a "routine" for us, even if only on demand, for specific orders, we are thinking about qualifing our standard products range by a series of Prototype Tests... also because it seeems that this certification is going to be mandatory for valves sold to Shell all over the world.

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