ADR tank special provision TU4
Cargo kept under an inert gas blanket of 50 kPa (0.5 bar) gauge or more; uncleaned empty tanks likewise charged with inert gas.
While being carried the substance must sit beneath an inert gas layer kept at no less than 50 kPa (0.5 bar) gauge. An emptied, uncleaned tank handed over for carriage must be charged with inert gas to at least the same gauge pressure.
| Value | Applies when |
|---|---|
| 50 kPa | minimum gauge pressure of the inert gas layer, loaded tank and uncleaned empty tank |
| 0.5 bar | same minimum gauge pressure expressed in bar |
Carried by 14 Table A entries
UN 1402 · UN 1928 · UN 2813 · UN 2965 · UN 3131 · UN 3391 · UN 3392 · UN 3393 · UN 3394 · UN 3395 · UN 3396 · UN 3398 · UN 3399
Source: ADR 2025 (ECE/TRANS/352), Volume II, section 4.3.5, TU4, page 223.
Paraphrase in FreightUtils' own words, not the official text. Not yet reviewed.
ADR 2027 amendments (accepted, applying from 1 January 2027) are not yet reflected on this page.