Differences between ISO 15848 and TA-Luft

TA-Luft

TA-Luft only deals with stem sealing area. Also, no third party witness is needed.

The TA-Luft test qualifies only a “high-quality sealing system”. TA-Luft is considered to be complied with if metal bellows with a safety energised packing or similar sealing systems are used; as per VDI 2440.

TA-Luft does not specify the number of mechanical cycles nor the number of thermal cycles.

Many valve manufacturers like to publish the TA-Luft logo but it often only means the seals themselves they use were TA-Luft certified! Simply using “TA-Luft packings” does not ensure long-term leak tightness. Many other factors play a role in sealing system, such as the stem surface finish and the tolerances dimensions between the gland and the stem.

ISO 15848

ISO 15848 is much more stringent.

ISO 15848 “Measurement, test and qualification procedures for fugitive emissions” the complete valve, and all seals, requires type testing.

The requirements of the type tests are very detailed: -

1: A distinction is made here between three tightness classes, namely A, B and C (Class A having the lowest environmental leakage).

2: Leakage is tested at room temperature without mechanical effects (helium leak detection test). Pressure, temperature, endurance & tightness parameters must be met.

Australian Pipeline Valve has a full range of ISO 15848 certification. To view Australian Pipeline Valve Fugitive Emission certificates click here.

Australian Pipeline Valve - short lead time, high quality oil and gas valve manufacturer. Specialising in short runs and supplying high specification valves. Click here to view and bookmark our catalogues. Click here to join the APV Group. Click here to follow our APV company page for frequent updates.

Global Supply Line - With $60 million inventory, we keep the world's largest valve and actuator stock range. Click here to view and bookmark our full stock list. Click here to view and bookmark our catalogues. Click here to join the GSL Group. Click here to follow our GSL company page for the latest updates.

Click here to subscribe to our newsletter.

Click here for all valve and piping technical references.