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fugitive emission testing for ball valves

fugitive emission testing for ball valves


Can anybody tell me what is Fugitive emission testing (FET test)? Why it is required & at what temp.? What is Production type & prototype FET testing? Which one is more stringent requirement production type test or prototype test?

Thanks in advance.


RE: fugitive emission testing for ball valves

Hello plu,

The paper below from 2006 should point you in the right direction, googling the different tests described, or using internal this site's search motor ought to give you more details.

RE: fugitive emission testing for ball valves

    for the definition of "type" and "production" tests you may refer to EN 736 valve terminology standard, Part 3, for instance.

    Some references about fugitive emissions TYPE testing may be:

        -    ISO 15848 std., Part 1

        -    German "TA-Luft" Regulation (Technische Anleitung zur Reinhaltung der Luft) and VDI 2440 guideline, Annex Test method
        (see and;     

        -    USA Clean Air Act and EPA "Method 21"
        (see and;     

        -    Shell MESC SPE 77/300 specification

    About fugitive emissions PRODUCTION testing, instead:

        -    ISO 15848 std., Part 2

        -    Shell MESC SPE 77/312 specification

    You may try to search the web, as well as within this Forum, using those keys.    Maybe you can start from:

        -    thread408-286731: FE Testing;

        -    thread408-283755: What is the diffeence between 77/300 and 77/312;

        -    thread408-268309: cm^3/s to ppmV;

        -    thread408-244396: Shell MESC SPE 77/312 vs ISO 15848-1 Class B for Low Fugitive Emission;

        -    thread408-261665: Additional Cost for Fugitive Emission Requirment;

        -    thread408-115884: ISO/DIS 15848-1 & -2 std's for Fugitive Emissions testing;

        -    thread408-155734: API 622 about Valve Packing type testing...

Hope this helps,




RE: fugitive emission testing for ball valves

FET measures leaks from stem seal and body joints of a valve.

There are two types of testing as mentioned by NGL: prototype testing and production testing.

In order to perform the production testing on valves, a manufacturer shall have the certificate from the prototype testing and the valves subjected the production testing shall be within the qualification range of the prototype testing.

The pressure class rating and the temperature range are for you to decide based on the design temperature of the valve. There is not set guideline as long as you can demostrate that P/T conditions can be prepared for the test.

The standards NGL listed are all different from each other in terms of details. You have to read them all and design the test jig to perform each of them.

FYI, there will be a new API FET standard coming up so look out for it.

I hope this helps.  

RE: fugitive emission testing for ball valves

       if I may ask: when You mention "a new API FET standard coming up", do You refer to a new revision of the existing API 622 (applicable to stem packing only, as a single component to be tested on a special fixture)?
       Or to a brand new standard with a new number, possibly applicable to complete valves?

Many Thanks in advance and Best Regards,

RE: fugitive emission testing for ball valves

No revision. It is a different number.

RE: fugitive emission testing for ball valves

 Good to know!  winky smile

RE: fugitive emission testing for ball valves

FYI, 622 was meant for the packing manufacturer not for the valve manufacturer.

RE: fugitive emission testing for ball valves

Yes, I know (and I agree)... but many Customers & Specifiers don't   ;-P  


RE: fugitive emission testing for ball valves

The new Standard will be to qualify a set valve range used in conjunction with API 622.  We are working on multi-turns only currently and thus far looking to be a pass or fail standard.  Hopefully this will set an industry standard to which both end-users and manufactures can agree to spec to. Lots of exciting stuff being worked on =)  

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