{"id":13539,"date":"2023-01-23T08:43:29","date_gmt":"2023-01-23T07:43:29","guid":{"rendered":"https:\/\/blog.wika.com\/en\/?p=13539"},"modified":"2023-08-17T10:04:57","modified_gmt":"2023-08-17T08:04:57","slug":"ta-luft-now-follows-iso-15848-1-for-fugitive-emissions","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/en\/knowhow\/ta-luft-now-follows-iso-15848-1-for-fugitive-emissions\/","title":{"rendered":"TA Luft now follows ISO 15848-1 for fugitive emissions"},"content":{"rendered":"

TA Luft has been revised. For the prevention of fugitive emissions, the new version of the German directive now follows the international standard ISO 15848-1. Correspondingly, tests in accordance with TA Luft follow the same test parameters as those in the ISO standard. However, the change in TA Luft has no consequences for WIKA valves in fugitive emission design that are already installed in applications. They were tested in accordance with both directives before delivery anyway.<\/strong><\/p>\n

A test to determine the emission rate of an instrumentation valve proceeds as follows: The valve undergoes artificial ageing under normal process conditions as well as using an inert trace gas, for example helium. After the test, a certificate is issued. The document states the emission rate determined. It also states the type of test item, temperature range and pressure, as well as the number of opening and closing cycles in the course of the test.<\/p>\n

TA Luft prevented a comparison of valves from different manufacturers<\/h2>\n

The basis for such testing for industry in Germany is primarily the Technical Instructions on Air Quality Control (TA Luft), first published in 1964. The 2002 version finally instructed the manufacturers of valves to proceed in accordance with VDI guideline 2440 and its permissible values when testing for fugitive emissions. However, they could determine the test parameters themselves. Users were therefore unable to make a direct comparison of valves from different manufacturers.<\/p>\n

Three emission classes and a definition of important test parameters<\/h2>\n

The 2021 revision of TA Luft has therefore ensured clear conditions by taking the internationally recognised DIN ISO 15848-1 as a basis for testing. Its strict requirements meet the market’s need for safe valves with a proven, minimised emission rate. The 2015 version of the standard defines three classes of permissible emissions: AH, BH, CH (\u201cH\u201d stands for helium). It also specifies important test parameters such as thermal and mechanical cycles, the type of measuring equipment and other technology, and the test methods.<\/p>\n

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New revision of TA Luft<\/h2>\n

(valid from 12\/2021)
\n<\/strong><\/td>\n

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Old version of TA Luft<\/h2>\n

(valid from 07\/2002)
\n<\/strong><\/td>\n<\/tr>\n

Para. 5.2.6.4.: Reference to DIN ISO 15848-1; tightness class B (LB) or C (LC) as specified in TA Luft<\/td>\nPara. 5.2.6.4.: Reference to VDI 2440 leakage rate 10-3 mbar*l\/s specified in the VDI 2440<\/td>\n<\/tr>\n
\n
    \n
  • Test method specified<\/li>\n
  • Mechanical and thermal cycles specified<\/li>\n
  • Performence classes specified<\/li>\n
  • Consideration of static seals with specified leakage rate<\/li>\n<\/ul>\n<\/td>\n
\n
    \n
  • No test methods specified<\/li>\n
  • No thermal or mechanical cycles specified<\/li>\n
  • No performance classes<\/li>\n
  • Static seals not included<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
-> Verification through independent third party<\/strong><\/td>\n-> Self-declaration<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00a0<\/h2>\n

VDI 2440 has also been revised<\/h2>\n

In addition to TA Luft, VDI 2440 has also been revised: In its paragraph 6.3.1.3, the ISO standard is now included as a test and evaluation basis and as tightness class B (LB). As a result, both directives focus on the international standard for the qualification of valves for the reduction of fugitive emissions. This therefore means:<\/p>\n