As part of investigations into a bus accident involving CNG container ruptures, the Netherlands would like to know whether other countries have experienced fires in CNG vehicles and what measures have been taken to reduce the potential risks.

Document prepared by the Chairman of the LNG Task Force (Netherlands) to respond to questions raised by France concerning the proposed LNG amendments to UN R110 (document GRSG/2013/7).

This compendium of case studies is provided in response to a question raised by the French delegation to the Amendments proposed to Regulation 110 pertaining to the use of LNG as a vehicular fuel.

Text prepared by the Chairman of the LNG Task Force (Netherlands) in response to concerns raised by France regarding the possibility of overfilling an LNG system. This amendment to the proposal to introduce LNG provisions into UN R110 (document GRSG/2013/7) matches ISO requirements covering the same issue.

Text prepared by the Chairman of the LNG Task Force (Netherlands) in response to questions raised by France concerning the proposed amendment to introduce LNG provisions into UN R110 (document GRSG/2013/7). The amendments aim to improve the internal consistency of the proposed amendments.

Proposal to clarify the text concerning automatic valves in the draft Supplement 1 to the 01 series of amendments to Regulation No. 110 (document WP.29/2013/101).

Copy of the proposal to clarify the text concerning automatic valves in the draft Supplement 1 to the 01 series of amendments to UN R110, submitted to the Working Party on General Safety as document GRSG/2013/28 for consideration at their October 2013 session.

In response to a bus accident where a pressure relief device produced a horizontal jet flame lasting several minutes, the Netherlands offers possible changes to CNG component and bus safety regulations.

Paper submitted to the UN Working Party on the Transport of Dangerous Goods to open discussions on the use of gaseous fuels in ADR vehicles.

Draft text of amendments to UN R110 to introduce provisions for liquefied natural gas systems pursuant to the 15th LNG Task Force session.

Since the 1960’s diesel has been the predominant fuel used for the propulsion of heavy goods vehicles. Fuel-related requirements for dangerous goods (ADR) vehicles have been based upon this prevalence; however, duel fuel vehicles using CNG and LNG have raised issues concerning the use of such fuel systems on ADR vehicles. This paper discusses ADR vehicles and such gaseous fuels.

Proposal to regulate the discharge direction of pressure relief devices (PRD) on CNG containers in response to a fire accident in the Netherlands in which the PRD produced a long horizontal jet flame for several minutes posing a risk to other road users and surrounding buildings.

Supplement 1 to the 01 series included requirements for the positioning of LNG tanks. While the Netherlands believes that mounting the LNG fuel tank 200mm above the road surface is broadly adequate; this proposal aims to ensure that the fuel tank cannot, under any normal driving or stationary working situations, come into contact with the ground. The new wording provides more definitive conditions, including the possibility of a vehicle having one or more flat tires as well as for those vehicles that have ‘kneeling’ capability or variable suspension, both of which lower the frame of the vehicle closer to the ground.

Proposal to introduce a new class of CNG components (Class 6) operating at a higher pressure.

Text prepared by the Netherlands and the International Association for Natural Gas Vehicles (IANGV/NGV Global) to clarify the provisions of Chapter 18 following the introduction of automatic valves (see report GRSG/84, para. 38).

Corrections to the proposal to clarify the provisions of Chapter 18 following the introduction of automatic valves (see report GRSG/84, para. 38).

Proposal to correct the numbering of chapter 18 following the introduction of provisions for automatic valves.

Proposal to regulate the direction of discharging the pressure relief devices of CNG containers.

Proposal to allow the use of Class 0 hoses with couplings using sealing technologies other than those with a 45° cone. Currently, non-seamless double and single wall tubes are used in brake and fuel tubing applications, allowing for the use of a variety of end forms and coupling techniques. Provided the hose assembly can withstand the impulse test of paragraph 1.7. and the tests of Annexes 5A (overpressure test) and 5B (external leakage test), such configurations should be permitted under UN R67 in order to remove an unwarranted design restriction. In cases where a soft seal body (e.g. O-ring) is used, the compatibility of the material with use conditions must be demonstrated by testing according to Annexes 5D (CNG/LNG compatibility test), Annex 5F (resistance to dry heat) and Annex 5G (ozone aging).

Proposal to include the liquefied natural gas (LNG) fuel connector provisions as specified in ISO 12617:2015.

Proposal to correct a typographical error in paragraph 7.1. where the reference should be to paragraph 8.22 rather than 8.21, to remove a duplicate and contradictory reference in Annex 4A to the requirements of Class 1 pressure relief valves, and to align paragraph 2.2. of Annex 4H with paragraph 18.6.1.2. limiting the delay in switching-off of the automatic valve after stalling of the engine to two seconds (rather than five as presently in the text).

Editorial amendment to document GRSG/2016/8 for clarity. The original proposal would allow the use of Class 0 hoses with couplings using sealing technologies other than those with a 45° cone provided that the hose assembly can withstand the impulse test of paragraph 1.7. and the tests of Annexes 5A (overpressure test) and 5B (external leakage test). This proposal clarifies that the original sealing-cone specification or other compliant couplings, including designs with soft seals (e.g., O-ring) provided they pass testing described in Annexes 5D, 5F, and 5G.

Proposal to correct the definition of “manual valve”, including deletion of the phrase “rigidly fixed to the cylinder or tank”.

Proposal to correct the definition of “manual valve”, including deletion of the phrase “rigidly fixed to the cylinder or tank”. The definition of the manual valve as part of the accessories fitted to the container or tank (para. 4.16.) is different from the definition specified in paragraph 4.22. The proposed editorial change aims at clarifying the text of these definitions.

Proposal for further discussion concerning technical advances in the use of CNG accumulators as an intermediate technology for promoting high, stable pressure in CNG engine injection systems. The CNG accumulator is used to stabilize the gas pressure and to allow engine operation whenever the LNG supply system is not able to deliver fuel. This proposal would define requirements to enable the certification of these components.

Proposal for discussion to enable the certification of CNG compressor components. Due to density and temperature constraints, LNG fuel systems require technologies to warm the LNG fuel to reach temperatures and pressures suitable for the engine. In some configurations, this involves the use of CNG compressors. Therefore, this proposal seeks to enable use of this technology through establishment of requirements to ensure safety.

Proposal to clarify the test procedure to be applied in assessing compliance with the requirement for “compatibility with heat exchange fluids of non-metallic parts” Annex 5Q is part of UN Regulation No. 110. In Annex 4D, the wording “Compatibility with heat exchange fluids” is used but there is no reference to the applicable tests. The proposal clarifies that the “LNG heat exchanger – vaporizer” falls within Annex 5Q. The proposal correspondingly clarifies the general overview Figure 1-2, with all tests from Annex 5, and Table 5.1 in Annex 5.

Proposal to introduce requirements for CNG compressor and CNG accumulator components designed to maintain stable pressure in fuel systems. See also documents GRSG-113-24 and 25 from the previous GRSG session.

Proposal to allow the use of a generator fueled by the vehicle gaseous fuel system that provides electricity to run accessories (e.g., overnight power in sleeper cabs, to maintain battery charge during high electrical power use with loading or lifting equipment). This proposal would allow for the use of LNG/CNG from vehicle fuel tanks and thereby reduce the potential need to vent gas into the air in response to pressure buildup due to warming over time by using the gas to power other devices and equipment.

Proposal to introduce requirements for CNG compressor and CNG accumulator components designed to maintain stable pressure in fuel systems.

Proposal to allow the use of a generator fueled by the vehicle gaseous fuel system that provides electricity to run accessories (e.g., overnight power in sleeper cabs, to maintain battery charge during high electrical power use with loading or lifting equipment). This proposal would allow for the use of LNG/CNG from vehicle fuel tanks and thereby reduce the potential need to vent gas into the air in response to pressure buildup due to warming over time by using the gas to power other devices and equipment.

Proposal for clarifications and editorial improvements to the draft amendment to require, in instances where that ogive covers be removed before conducting the impact damage (drop) test.

Proposal to adapt to technological progress and align UN R110 with ISO 15500 and NGV 3.1.

Proposal to update the vehicle-fuel identification symbols in line with ISO 17840-4, Part 4 (Propulsion energy identification) and to extend the scope of the identification requirements to N_/2 and N₃ vehicles.

Proposals to update the existing requirements for compressed natural gas/liquified natural gas (CNG/LNG) fuelled components.

Text corrects errors/mistakes in the current regulation and update text to be in line with the requirements coming from ISO15500 and NGV3.1 (industry standards for CNG)

Proposes the addition of design qualification tests also will harmonize with ISO 15500-13:2012, and the North American CSA/ANSI PRD 1 (2020).

Update paragraphs to be in line with the requirements of ISO15500 and NGV3.1 (industry standards for CNG).

Proposal to correct references to paragraphs 1.3.2. instead of 3.1.2. and 1.3.1. instead of 3.1.

Proposal from the GRSG task force on Automated Vehicles Regulation Screening to enable application of UN R110 to ADS vehicles, including exemption of vehicles of subcategories X and Y from provisions that concern manual driving controls, and to clarify the provisions for vehicles in case of separate driver´s compartment.

Proposal prepared by the Task Force on Automated Vehicles Regulatory Screening (TF-AVRS), with the aim to amend and supersede document ECE/TRANS/GRSG/2025/31.

Proposal to enable the application to ADS vehicles, including exemptions of vehicles of subcategories X and/or Y from certain provisions concerning manual driving, attention to non-DDT tasks otherwise performed by the driver, introduction of provisions for “ADS features of type 1 and type 2”, and to update provisions concerning the running mass and occupants.