Gases of fluid group 1

Pipelines according to Article 3 Number 1.3 Letter a) First dash

Exception: Unstable gases (e.g. acetylene and ethylene) belonging to Categories I and II, must be included in Category III

Gases of fluid group 2

Pipelines according to Article 3 Number 1.3 Letter a) Second dash

Exception: Liquids and steam, at temperatures > 350 °C belonging to Category II must be included in Category III.

Liquids of fluid group 1

Pipelines according to Article 3 Number 1.3 Letter b) First dash

Liquids of fluid group 2

Pipelines according to Article 3 Number 1.3 Letter b) Second dash