UN R95 — 06 series of amendments

New paragraph 5.3.7. says that, in the case of a compressed hydrogen-fuelled vehicle, compliance with paragraphs 5.3.7.1. to 5.3.7.3. must be shown. The hydrogen leakage rate must not exceed an average of 118 NL per minute for the time interval, Δt minutes, after the crash (paragraph 5.3.7.1.). Under paragraph 5.3.7.2., the gas concentration by volume in air in the passenger and luggage compartments “shall not exceed 4.0 per cent for hydrogen or 3.0 per cent for helium, at any time throughout the 60 minute post-crash measurement period”. This requirement is satisfied if it is confirmed “that the shut-off valve of each compressed hydrogen storage system has closed within five seconds of first vehicle contact with the barrier and there is no leakage from the compressed hydrogen storage system(s)”. The container(s) (for hydrogen storage) must remain attached to the vehicle at a minimum of one attachment point (paragraph 5.3.7.3.). Paragraphs 5.3.7.1. and 5.3.7.2. refer to “Annex 12”; a new RegVault Note says that this Regulation has no Annex 12 and points to Annex 10.

New Annex 10 gives the test conditions and procedures for the assessment of post-crash hydrogen fuel system integrity, to determine compliance with paragraph 5.3.7. Before the crash test, the container is filled to a minimum of 95 per cent of the targeted fill pressure and allowed to settle. Sensors in the passenger and luggage compartments measure the build-up of hydrogen or helium gas, or the reduction in oxygen. For the leak test, the gas pressure and temperature are measured immediately before the impact and again after a time interval, Δt. This time interval starts when the vehicle comes to rest after the impact and continues for at least 60 minutes. In enclosed spaces, sensor data are collected at least every five seconds for 60 minutes after the test.

In the definition of “Vehicle type” (paragraph 2.2.), the words “in so far as they have an adverse effect on the result of the impact test prescribed in this UN Regulation” now come before the list of essential respects. Before, each listed respect had its own condition, such as “in so far as they have a negative effect on the performance prescribed in this Regulation”. New item (i) is “The basic configuration and main characteristics of the compressed hydrogen storage system”. Paragraph 2.3.2. now defines “Passenger compartment for electric safety and/or hydrogen safety assessment” instead of “Passenger compartment for electric safety assessment”, and says “back door” instead of “rear gate”. New paragraphs 2.49. to 2.53. define “Compressed hydrogen storage system (CHSS)”, “Container” (for hydrogen storage), “Container Attachments”, “Hydrogen-fuelled vehicle” and “Shut-off valve (for hydrogen-fuelled vehicles)”. Under paragraph 2.52., hydrogen fuel for the vehicles is specified in ISO 14687:2019 and SAE J2719_202003.

Former paragraphs 5.3.7. to 5.3.8. are renumbered as paragraphs 5.3.8. to 5.3.9. In paragraph 5.2., the references to paragraph 5.3.7. are now references to paragraph 5.3.8. A new RegVault Note says that the 06 series renumbered these paragraphs without updating the references to them. The note says that a reference to a former number (5.3.7.…) corresponds to the new number (5.3.8.…).

As from the official date of entry into force of the 06 series, no Contracting Party may refuse to grant or accept 06 series type-approvals. As from 1 September 2027, Contracting Parties need not accept type-approvals of vehicles to the preceding series first issued after 1 September 2027 (paragraph 11.2.). Before, the date in paragraphs 11.2. and 11.3. was 1 September 2023. Contracting Parties must continue to accept these approvals first issued before 1 September 2027, provided the transitional provisions in the previous series foresee this possibility. Paragraph 11.4. now says that Contracting Parties may grant type approvals according to any preceding series; before, it said they “shall not refuse to grant” them “or extensions thereof”. New paragraph 11.5. says that they must continue to grant extensions of existing approvals to any preceding series, and former paragraph 11.5. becomes paragraph 11.6.

In Annex 2, the texts under the approval mark examples now refer to the 06 series of amendments instead of the 04 series. In one example text, the approval number is now 061424 instead of 041424. The two approval mark drawings are also updated. Three footnotes that refer to the Consolidated Resolution on the Construction of Vehicles now refer to document ECE/TRANS/WP.29/78/Rev.7. Before, two of them referred to Rev. 3 and one to Rev.6. They also give a new web address.

Each of Figures 2a to 2e in Annex 5, Appendix 2 now has a legend table. Each table gives, for each letter, a deflection in mm and a force in kN. Figures 2a to 2e have updated drawings. In Figure 2a, “Blocks 1 & 3” now reads “Blocks 1 and 3”. In Figure 2d, “Blocks 5 & 6” now reads “Blocks 5 and 6”.