Standards commonly specified for marine HVAC&R
Ship specifications and makers' lists often call up the standards below. Which ones apply depends on the vessel, the flag, the classification society and the owner's specification. List the ones that apply to your project in the enquiry.
Design conditions and calculation
| Standard | What it covers | In your enquiry |
|---|---|---|
| ISO 7547:2022Ships and marine technology — Air-conditioning and ventilation of accommodation spaces and other enclosed compartments on board ships — Design conditions and basis of calculations | Sets outdoor and indoor design conditions and the calculation method for heat load and air quantities in accommodation spaces of seagoing merchant ships. The 2022 edition replaces ISO 7547:2002 and also absorbs the former ISO 8862 (machinery control rooms), ISO 8863, ISO 8864 (wheelhouse) and ISO 9099 (dry provision stores); many specifications still cite ISO 7547:2002. | State whether cabin, control-room and wheelhouse design conditions follow ISO 7547, and which edition, or the owner’s specification with its own summer and winter design values. |
| ISO 8861:1998Shipbuilding — Engine-room ventilation in diesel-engined ships — Design requirements and basis of calculations | Gives design requirements and a calculation method for engine-room supply air, based on combustion air demand and the heat emitted by machinery, for diesel-engined ships in normal conditions in all waters. | State whether engine-room fan capacities are to be calculated to ISO 8861, and supply the engine and generator combustion-air and heat-emission data the calculation needs. |
| ISO 9943:2009Shipbuilding — Ventilation and air-treatment of galleys and pantries with cooking appliances | Sets design requirements for supply and exhaust ventilation and air treatment of galleys and pantries with cooking appliances on seagoing merchant ships, where the shipowner specifies it. | State whether galley and pantry ventilation is to follow ISO 9943 and list the cooking appliances with their rated power. |
Refrigerating system safety
| Standard | What it covers | In your enquiry |
|---|---|---|
| ISO 5149-1 to -4Refrigerating systems and heat pumps — Safety and environmental requirements (Part 1: Definitions, classification and selection criteria; Part 2: Design, construction, testing, marking and documentation; Part 3: Installation site; Part 4: Operation, maintenance, repair and recovery) | Covers refrigerant classification and charge limits, design and pressure testing of the refrigerant circuit, machinery-room ventilation and detection, and servicing and refrigerant recovery. Parts 1 to 3 are the 2014 editions with amendments (Part 1 Amd 2:2021, Part 2 Amd 1:2020, Part 3 Amd 1:2021); Part 4 is ISO 5149-4:2022. | State whether the refrigerating plant is to be designed to ISO 5149 and name the refrigerant and the space where the refrigerating machinery will be installed. |
| EN 378-1 to -4Refrigerating systems and heat pumps — Safety and environmental requirements (Part 1: Basic requirements, definitions, classification and selection criteria; Part 2: Design, construction, testing, marking and documentation; Part 3: Installation site and personal protection; Part 4: Operation, maintenance, repair and recovery) | The European counterpart to ISO 5149, often named in specifications from European owners and yards. Current parts are EN 378-1:2016+A1:2020, EN 378-2:2016, EN 378-3:2016+A1:2020 and EN 378-4:2016+A1:2019; a revision (prEN 378:2025) is at draft stage. | State whether EN 378 applies in place of, or in addition to, ISO 5149, and which part editions your specification refers to. |
| ANSI/ASHRAE Standard 15-2024Safety Standard for Refrigeration Systems | Sets requirements for the safe design, construction, installation and operation of refrigeration systems, including machinery-room requirements. It is used together with ANSI/ASHRAE Standard 34-2024, which assigns refrigerant designations and safety classifications; US-flag and North American specifications tend to cite it. | State whether ASHRAE 15 is required and which edition, since 2019 and 2022 editions are still cited in some specifications. |
Electrical equipment and hazardous areas
| Standard | What it covers | In your enquiry |
|---|---|---|
| IEC 60092-101:2018Electrical installations in ships — Part 101: Definitions and general requirements | Gives definitions and general requirements for shipboard electrical installations, including supply-system characteristics and design ambient temperatures, up to 1 000 V AC and 1 500 V DC. Other parts of the IEC 60092 series cover cables, switchgear and rotating machines. | State the ship’s supply voltage, frequency and earthing system, and the design ambient temperature for motors and control panels. |
| IEC 60092-502:1999Electrical installations in ships — Part 502: Tankers — Special features | Covers electrical installations in tankers carrying flammable liquids or liquefied gases, including hazardous-area zones around cargo tanks, pump rooms and vents and the equipment permitted in each. | For tankers and gas carriers, state which fans or units are located in or serve hazardous areas and the zone assigned to each location. |
| IEC 60079-0:2026Explosive atmospheres — Part 0: Equipment — General requirements | Sets general construction, testing and marking requirements for Ex equipment, such as explosion-protected fans and motors for pump rooms, paint stores and offshore hazardous areas; specific protection types are covered by other parts of IEC 60079. Edition 8.0 was published in June 2026 and replaces IEC 60079-0:2017, which many current specifications still cite. | State the hazardous zone, gas group and temperature class for each Ex item, and whether IECEx, ATEX or another scheme is required. |
| IEC 60529:1989+AMD1:1999+AMD2:2013Degrees of protection provided by enclosures (IP Code) | Defines the IP code that grades enclosure protection against solid objects and water, used to specify motors, control panels and outdoor units according to where they are installed on board. | State the IP rating required for each location, for example open deck, machinery space or accommodation. |
Fire safety
| Standard | What it covers | In your enquiry |
|---|---|---|
| SOLAS Chapter II-2, Regulation 9.7International Convention for the Safety of Life at Sea, 1974 — Chapter II-2 Construction — Fire protection, fire detection and fire extinction — Regulation 9 Containment of fire, paragraph 7 Ventilation systems | Sets requirements for ventilation ducts and fire dampers where ducts pass through fire divisions, separate ventilation of machinery and galley spaces, and galley exhaust ducts. IACS unified interpretations and class rules add detail to these provisions. | Confirm which ducts penetrate A-class or B-class divisions so that fire dampers and duct sleeves can be included in the scope. |
| IMO Res. MSC.307(88) — 2010 FTP CodeInternational Code for Application of Fire Test Procedures, 2010 (2010 FTP Code) | Sets the fire test procedures used for approval of products required by SOLAS Chapter II-2. Part 3 covers tests for A, B and F class divisions, and its Appendix 2 includes the testing of fire dampers and duct penetrations. | State whether fire dampers are in our scope and whether they must carry type approval tested under the 2010 FTP Code, Part 3. |
Crew accommodation and noise
| Standard | What it covers | In your enquiry |
|---|---|---|
| MLC, 2006 — Regulation 3.1, Standard A3.1Maritime Labour Convention, 2006, as amended — Regulation 3.1 Accommodation and recreational facilities | Standard A3.1, paragraph 7 requires adequate ventilation of sleeping rooms and mess rooms and air conditioning for seafarer accommodation, any separate radio room and any centralized machinery control room, except on ships regularly trading where temperate climatic conditions do not require it. Guideline B3.1 adds recommendations on heating and ventilation. | State the ship’s trading area and whether the air-conditioning scope is to cover accommodation, radio room and machinery control room as described in MLC Standard A3.1. |
| IMO Res. MSC.337(91)Code on Noise Levels on Board Ships | Mandatory under SOLAS regulation II-1/3-12 for new ships of 1,600 gross tonnage and above, it sets maximum noise levels for machinery spaces, control rooms, accommodation and service spaces. Measurements are taken with ventilation, heating and air-conditioning equipment in normal operation, so HVAC fan and outlet noise counts toward cabin limits. | State the noise limits that apply to cabins, mess rooms and the wheelhouse, and whether your owner’s specification sets lower values than the Code. |
| ISO 2923:1996Acoustics — Measurement of noise on board vessels | Describes techniques and conditions for measuring noise on board vessels, for comparison between ships, acceptance tests against national and international requirements, and monitoring. A technical corrigendum was issued in 1997. | State whether sea-trial noise measurements are to follow ISO 2923 or the procedure in the IMO Noise Code, and which spaces will be measured. |
Refrigerants and environment
| Standard | What it covers | In your enquiry |
|---|---|---|
| MARPOL Annex VI, Regulation 12MARPOL Annex VI — Regulations for the Prevention of Air Pollution from Ships — Regulation 12: Ozone-depleting substances | Prohibits deliberate emissions of ozone-depleting substances and prohibits new installations containing them: installations containing ozone-depleting substances other than HCFCs from 19 May 2005, and installations containing HCFCs (such as R22) on ships constructed, or equipment delivered to ships, on or after 1 January 2020. Ships must keep a list of equipment containing such substances, and those with rechargeable systems must keep an ozone-depleting substances record book. | State the refrigerant you require or accept, and for retrofits on existing ships, the refrigerant in the equipment being replaced. |
| Kigali Amendment (2016) to the Montreal ProtocolThe Kigali Amendment (2016): The amendment to the Montreal Protocol agreed by the Twenty-Eighth Meeting of the Parties (Kigali, 10-15 October 2016) | Adds hydrofluorocarbons (HFCs) such as R134a, R404A and R407C to the Montreal Protocol for a phase-down of production and consumption, in force since 1 January 2019. National phase-down schedules affect the future availability and price of HFC refrigerants for service. | State whether the owner has a policy on HFC refrigerants or prefers lower-GWP or natural refrigerants for the vessel’s service life. |
| Regulation (EU) 2024/573Regulation (EU) 2024/573 of the European Parliament and of the Council of 7 February 2024 on fluorinated greenhouse gases, amending Directive (EU) 2019/1937 and repealing Regulation (EU) No 517/2014 | The EU F-gas Regulation. Refrigeration and air-conditioning equipment on ships is not among the mobile equipment listed for mandatory leak checks in Article 5(3); the recitals state that ship operators should take precautions against leakage, and the Commission is to assess extending containment requirements to ships. | If the vessel is EU-flagged or will be serviced in EU ports, state whether the owner applies F-gas containment practice or GWP limits to shipboard systems. |
| Hong Kong Convention, 2009The Hong Kong International Convention for the Safe and Environmentally Sound Recycling of Ships | In force since 26 June 2025. It prohibits or restricts the installation of listed hazardous materials, including ozone-depleting substances, and requires ships to carry a ship-specific inventory of hazardous materials (IHM), which records refrigerants and insulating materials in HVAC and refrigeration equipment. | State whether material declarations for the inventory of hazardous materials are required with the delivered equipment. |
This list is for reference. It is not a statement that any JOSUN product has been certified or approved to a particular standard. Class approval and certificates are confirmed per project.
Send the specification
Send the vessel type, the cabin or space heat load and the classification society involved.