CCS updates hydrogen-fuelled ship safety guidance ahead of October rollout

China Classification Society (CCS) has issued its Guidelines for Ships Using Hydrogen Fuel, 2026 Edition, which will take effect on October 1, 2026. The guidelines establish requirements for the safe design, construction and operation of hydrogen-powered and fuel-cell vessels, covering areas including hydrogen bunkering, storage, supply and onboard use.

Published on the society’s website on September 3, the guidelines replace CCS’s 2022 guidance on marine fuel-cell power installations. The revised framework incorporates hydrogen fuel systems and fuel-cell installations into a two-part technical document.

Which vessels do the hydrogen guidelines cover?

Part One applies to ships measuring 20 metres or more in length, constructed from steel or equivalent materials, that use hydrogen as fuel or are designed with provisions for hydrogen fuel systems.

It sets requirements for the arrangement, installation, control and monitoring of machinery, equipment and associated systems, with the objective of reducing risks to vessels, crew and the environment.

Part Two covers ships meeting the same minimum length and material requirements that are fitted with fuel-cell power installations. Its provisions address the arrangement and installation of these systems to support safe and reliable production of electrical energy, thermal energy, or both.

How were the safety requirements developed?

The publication follows an expert review organised by CCS in Wuhan, which the classification society reported on May 15, 2026. Representatives from 34 organisations participated, including maritime authorities, universities, research institutes, ship designers, shipping companies, shipbuilders, equipment manufacturers and ship inspection bodies.

The development formed part of a Chinese national research programme examining key technologies for hydrogen-powered ships. CCS led the associated work on risk assessment and design standards for maritime hydrogen applications.

The research examined different hydrogen storage technologies and propulsion configurations, as well as risks across the fuel system, factors contributing to accidents and protective measures at critical stages of operation.

According to CCS, the resulting guidance provides a technical basis for the design, construction and inspection of inland and coastal hydrogen-powered vessels. The review also considered industry feedback and how it was incorporated into the draft.

How does the release fit into international hydrogen safety work?

The CCS publication comes amid wider efforts to develop international safety provisions for alternative marine fuels.

At its 111th session in London, held from May 13 to 22, 2026, the International Maritime Organization’s (IMO) Maritime Safety Committee approved interim guidelines for the safety of ships using hydrogen as fuel.

The committee also advanced other alternative-fuel safety and training measures, reflecting the need to address fuel-specific hazards alongside the introduction of new propulsion technologies.

The CCS document and the IMO interim guidelines are separate instruments. Their development reflects parallel work by classification societies and international regulators to establish technical frameworks for hydrogen use aboard ships.

What is hydrogen’s role in shipping decarbonisation?

Hydrogen is among the alternative energy options identified by the IMO for reducing shipping emissions, alongside ammonia, methanol, biofuels, electricity and wind-assisted propulsion.

Its environmental performance needs to be assessed across the full fuel lifecycle. The IMO’s lifecycle assessment framework considers emissions from production and delivery as well as onboard use. Consequently, the emissions benefit of hydrogen depends on its production pathway and supply chain.

The IMO’s 2023 greenhouse gas strategy calls for zero or near-zero emission technologies, fuels and energy sources to account for at least 5%, striving for 10%, of international shipping’s energy use by 2030.

Alongside these environmental objectives, the organisation identifies safety, infrastructure, pricing and supply constraints as considerations for alternative-fuel deployment. The new CCS guidance establishes technical safety requirements for hydrogen systems and fuel-cell installations.