ADR tank code L21DH
ADR tank code for Classes 1 and 3–9: liquid tank, 21 bar, openings D, hermetically closed.
L21DH is decoded part by part from the 4.3.4.1.1 table for Classes 1 and 3–9. Part 1 "L" is a tank for liquid-state substances (liquids, or solids handed over molten); part 2 "21" is minimum calculation pressure of 21 bar (see 6.8.2.1.14). Part 3 "D" (openings): filled and discharged from the top; nothing opens below the liquid surface. Part 4 "H" (safety valves/devices): the tank is hermetically closed (see 1.2.1). The code gives the least stringent tank accepted; others may be used under the hierarchy in 4.3.4.1.2.
| tank type: L | tank for liquid-state substances (liquids, or solids handed over molten) |
|---|---|
| calculation pressure: 21 | minimum calculation pressure of 21 bar (see 6.8.2.1.14) |
| openings: D | filled and discharged from the top; nothing opens below the liquid surface |
| safety valves: H | hermetically closed (see 1.2.1) |
Note. Tank codes permitted in place of this one: see the rationalized approach and hierarchy in 4.3.4.1.2 (Volume II pages 217–222); not computed here.
Refers to: 4.3.4.1.1; 4.3.4.1.2; 6.8.2.1.14; 6.8.2.2.2; 6.8.2.2.6; 1.2.1.
Carried by 8 Table A entries
UN 1380 · UN 2845 · UN 2870 · UN 3194 · UN 3391 · UN 3392 · UN 3393 · UN 3394
Source: ADR 2025 (ECE/TRANS/352), Volume II, section 4.3.4.1.1, tank code L21DH, page 220.
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.