UN R134 — 03 series of amendments

The CHSS definition in paragraph 2.3. now includes supply lines for additional TPRDs (if any). Footnote 1 now excludes supply lines for additional TPRDs made of materials other than metal, until specific requirements for such materials have been defined. Paragraph 2.1. now defines “appropriate adaptor” instead of “burst disc”. A new note in paragraph 2.5. considers some parts as container attachments. These are non-pressure bearing parts attached to the container that provide additional support or protection to additional TPRDs and their supply lines. Item (c) of paragraph 2.29. adds supply lines for additional TPRDs to the sorts of component.

Under paragraph 5., item (b), manufacturers may choose to locate additional TPRDs in alternative locations on the container, if needed. Any high-pressure supply lines for such additional TPRDs must have demonstrated mechanical integrity and durability as part of qualification tests for the container. These tests are the verification tests for baseline metrics in paragraph 5.1. and the hydraulic sequential test in paragraph 5.2., excluding the drop test. A new note says that the post-crash fuel system integrity requirements in paragraph 7.2. also apply to supply lines for additional TPRDs. In the first two rows of Table 2, the test article now includes supply lines for additional TPRDs, as applicable. New Annex 9 is a table that describes the test articles for the performance requirements in paragraphs 5.1. to 5.4.

Paragraphs 5.1.1., 5.1.2., 5.2.1., 5.2.3. to 5.2.8., 5.3.1., 5.3.4. and 5.3.5. now include supply lines for additional TPRDs (if any) through appropriate adaptors. Unless otherwise specified, the paragraph 5.2. tests now also include these supply lines (if any) through appropriate adaptors. In paragraphs 5.2. and 5.3., the worst-case approach may be applied to these lines at the discretion of the Technical Service and Type Approval Authority. During the entire fire test of paragraph 5.4., additional TPRDs must remain connected to the container by at least one attachment point. Annex 3, paragraphs 2.1., 2.2., 3.1., 3.4. and 5.1., and paragraphs 9.2., 9.2.1. and 9.2.3.2. on production control, also include these supply lines (if any).

The drop (impact) test in paragraph 5.2.2. does not apply to supply lines for additional TPRDs. In Annex 3, paragraph 3.2., the container and its container attachments (if any) are drop tested without internal pressurization, attached valves or these supply lines. A new note: the manufacturer applying for approval must provide handling procedures so that these lines do not suffer damage or contamination during handling. The handling procedure must require the removal from service of supply lines that have unacceptable damage.

Annex 7, table 1 has new rows for supply lines for additional TPRDs. The new rows cover a changed location of the additional TPRD, diameter, bend radius, length, line routing and number of fittings. Under new note 8, the tests in these rows are not required if the tested worst-case configuration covers the supply line parameters.

The geometry of the fuelling receptacle must now be in accordance with ISO 17268:2020 or ISO 17268-1:2025. Depending on its nominal working pressure and specific application, it must be compatible with specification H35, H35MF or H70. Before, the receptacle had to conform to ISO 17268:2020, and the specifications were H35, H35HF or H70.

New paragraph 13.1. is “General”, and new paragraphs 13.2., 13.3. and 13.4. give transitional provisions for the 01, 02 and 03 series. As from 1 September 2028, Contracting Parties are not obliged to accept type approvals to any preceding series first issued after that date. As from 1 September 2029, they are not obliged to accept type approvals issued to any of the preceding series. Paragraph 13.4.5. sets an exception to paragraph 13.4.4. for vehicles or vehicle systems not affected by the changes introduced by the 03 series. For them, Contracting Parties must also continue to accept approvals to the preceding series, provided the transitional provisions of those series foresee this possibility. In the Annex 2 approval mark examples, the series number changes from 02 to 03.