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So called ‘TA Luft’ is a German national control regulation with the associated test procedure VDI 2200 and VDI 2440. The German Fugitive Emission Control Legislation refers in TA-Luft regulation to VDI 2440 for defining leakage rates, test and measuring methods. This regulation was originally established in 1964 and until 2006 it was the only acknowledged industry standard used to classify fugitive emissions leakage to atmosphere. This document specifies how much a flange connection or a stem /gland is allowed to leak, though it is not specified under which circumstances. Instead, it is up to the manufacturer to test the parts under the conditions that they think the product is manufactured for. This can be considered by many to be arbitrary as it will then be up to each individual manufacturer to decide under which conditions leak tests are performed – effectively TA-Luft does not specify for how many mechanical or thermic test cycles the joint have to undergo in order to pass testing. According to TA-Luft and VDI 2440 flange connections must comply with maximum leakage rate of 10- mbar × l (s × m) at test pressure of 1 bar. VDI 2200 defines the selection, calculation, design and assembly of bolted flange connections as well as test procedures and refers to VDI 2440 regarding permissible leak rates. VDI 2200 also defines criteria for “Blowout” safety test for gaskets. Aim of this Blow-out test is to avoid a sudden leakage through seal burst