ADR special provision 652
Aviation-approved hot-air balloon fuel receptacles in service before 1 July 2004 may go by road under listed conditions without Chapter 6.2.
Austenitic stainless steel, duplex steel and welded titanium receptacles built and approved under national aviation rules as hot-air balloon or airship fuel receptacles, first inspected before 1 July 2004, may be carried by road even though they do not meet Chapter 6.2. The 6.2.1 general provisions apply and an air transport authority must have approved the design. A reduced reference temperature of +40 °C may be used for the calculation pressure, with relaxations for titanium and steel and a 26 bar relief device and at least 30 bar test pressure; otherwise 65 °C design with authority-set relief pressure. They need a water-resistant foam cover at least 25 mm thick, secure crating, a label restricting use to hot-air balloons and airships, and a service life of no more than 25 years.
| Value | Applies when |
|---|---|
| 1 July 2004 date | brought into service (initial inspection) before this date |
| 40 °C | reduced maximum ambient temperature for calculation pressure under (c) |
| 450 MPa | titanium Rm must exceed this under (c)(i) |
| 20 % | titanium elongation after fracture must exceed this under (c)(i) |
| 85 % of minimum guaranteed yield strength | maximum stress level for steel cylinders under (c)(ii) |
| 26 bar | nominal set pressure of relief device under (c)(iii) |
| 30 bar | minimum test pressure under (c)(iii) |
| 65 °C | reference design temperature when (c) is not used |
| 25 mm | minimum thickness of protective outer layer |
| 25 years | maximum service duration from initial inspection |
Conditions
- (a) The general provisions of 6.2.1 are met.
- (b) A national air transport authority has approved the receptacle design and construction for aviation.
- (c) Optionally, calculation pressure from a +40 °C maximum ambient (exempting 6.2.3.1.2): (i) commercially pure titanium allowed with Rm > 450 MPa and A > 20 %; (ii) steel cylinders stressed up to 85 % of minimum guaranteed yield; (iii) relief device set at 26 bar and test pressure of at least 30 bar.
- (d) If (c) is not used, design for 65 °C with relief devices at a set pressure fixed by the country-of-use authority.
- (e) Water-resistant outer layer of structural cellular foam or similar, at least 25 mm thick.
- (f) Firmly secured in a crate or other safety device during carriage.
- (g) Clear visible label stating use only in hot-air balloons and airships.
- (h) Service life from initial inspection no more than 25 years.
Note. Text continues onto page 651.
Refers to: 6.2.1; 6.2.3.1.2; 6.2.5.1.
Carried by 3 Table A entries
Source: ADR 2025 (ECE/TRANS/352), Volume I, section 3.3.1, special provision 652, page 650.
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.