Section 1 General

101. Application

1. This Guidance is to apply to fuel cell systems on board of ships used as auxiliary or main source of power.

2. IfuneltshiswiGthuifdlasnhce,poointlybethloewga6s0e℃ous afrueelrseglairgdhetder atsha"nFCairfuienl",amrebgieanrdtlecsosndoiftioPnts 8asChw2ell10a1s. l1iqu(1id) of the Rules for the Classification of Steel Ships(hereafter referred to as "the Rules for Steel Ships"). Gas may be stored in gaseous or liquid state. Typical fuels that may be relevant are natu- ral gas, methanol, hydrogen or diesel fuels. Liquid fuels with flash point above 60℃are to follow the requirements for normal fuel in the Rules for Steel Ships, Pt 5 Ch 6. Sec.9 and Pt 8 Ch 2 101.

Items not specified in this Guidance are to be in accordance with each relevant requirement in the

3. Rules for Steel Ships except for the requirements inapplicable to fuel cell systems in ships.

Items not included in this Guidance may comply with ISO, IEC, KS or equivalent recognized

4. standards by the appropriate consideration of the Society.

Additional requirements to this Guidance may be required.

5.

Where installations of fuel cell systems on board of ships are intended, those are to be accepted

6. by the flag state in advance.

102. Definitions

The definitions of terms are to follow the Rules for Steel Ships, unless otherwise specified in this Guidance.

1. "Accidents" means uncontrolled events that may entail the loss of human life, personal injuries, environmental damage or the loss of assets and financial interests.

2. "Certified safe type" means electrical equipment that is certified safe by the Society based on a recognized standard(refer to IEC 60079 series, explosive atmospheres and IEC 60092-502 Electrical Installations in Ships-Tankers-Special Features). The certification of electrical equipment is to corre- spond to the category and group for the gas used.

3. "Breadth(B)" means the breadth defined in Pt 7 Ch 5. 106. 5 of the Rules for Steel Ships.

4. "Control stations" means those spaces defined in Part 8 of the Rules for Steel Ships and addi- tionally includes for this Guidance, the engine control room.

5. "Double block and bleed valve" means a set of three automatic valves located at the FC fuel supply to each of the FC fuel utilization units.

6. "Enclosed space" means any space within which, in the absence of artificial ventilation, the ven- tilation will be limited and any explosive atmosphere will not be dispersed naturally(See also defi- nition in IEC 60092-502).

7. "ESD" means emergency shutdown.

8. "Explosion" means a deflagration event of uncontrolled combustion.

9. "Explosion pressure relief" means measures provided to prevent the explosion pressure in a con- tainer or an enclosed space exceeding the maximum overpressure the container or space is designed for, by releasing the overpressure through designated openings.

10. "Fuel cell(FC)" means a source of electrical power in which the chemical energy of a fuel is converted directly into electrical energy by electrochemical oxidation.

11. "Fuel cell stack(FC stack)" means a assembly consisting of several fuel cells that are electri- cally connected in series, with internal interconnections for electricity and gas/liquid. An FC stack

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12.

13.

in the terms of these Guidance also includes the pipe connection fittings as well as the connections required to supply the electrical energy.

"Fuel cell system (FC system)" means a complete installation, in general, comprising the fol lowing components:

(1) fuel cell stacks

(2) storage, transfer and processing system of fuel

(3) storage and processing system of the oxidants (air or oxygen)

(4) processing system of residual gas and exhaust gas

(5) thermal management system

(6) water treatment system

(7) power interconnections between the systems

(8) control, monitoring and safety system

"Fuel cell installation" means all the components required for the production of energy by the fuel cell.

14. "Fuel cell space" means a space used for machinery spaces containing fuel cell installations.

15.

16.

"FC fuel" means the fuels which are gases lighter than air in ambient conditions or liquids with low flash point(below 60 °C) and used at fuel cell. The special requirements specified in this Guidance for FC fuel are to be applied to only the FC fuels. FC fuels are, for example, natural gas, methanol, hydrogen or diesel fuels. Liquid fuels with flash point above 60℃ are to follow the requirements for normal fuel in the Rules for Steel Ships, Pt 5 Ch 6. Sec.9 and Pt 8 Ch 2 101.

"Fuel processing system" means the system that converts, if necessary, or conditions the fuel as stored in the onboard fuel storage into fuel suitable for operation in the fuel cell stack.

17. "Fuel reformer system" means a chemical process system necessary for changing supply fuel to suitable composition for fuel cell stack, including relevant heat exchangers and controls.

18.

19.

20.

21.

"Gas" means a fluid having a vapour pressure exceeding 0.28 MPa absolute at a temperature of

37.8 °C.

"Hazardous area" means an area in which an explosive gas atmosphere or a flammable gas (flash point below 60 °C) is or may be expected to be present, in quantities such as to require spe- cial precautions for the construction, installation and use of electrical apparatus. Hazardous areas are divided into zones 0, 1 and 2 as defined below(refer also to the area classification specified in Sec. 2.5 of IEC 60079-10-1, Part 10-1) :

(1) Zone 0 is an area in which an explosive gas atmosphere or a flammable gas with a flash point below 60 °C is present continuously or is present for long periods.

(2) Zone 1 is an area in which an explosive gas atmosphere or a flammable gas with a flash point below 60 °C is likely to occur in normal operation.

(3) Zone 2 is an area in which an explosive gas atmosphere or a flammable gas with a flashpoint

below 60°C is not likely to occur in normal operation and, if it does occur, is likely to do so only infrequently and will exist for a short period only.

"Non-hazardous area" means an area which is not considered to be hazardous, i.e. gas safe, provided certain conditions are being met.

"High-pressure piping" means FC fuel piping with maximum working pressure greater than 1.0 MPa.

22. "IEC" means the International Electro-technical Commission.

23. "LEL" means the lower explosive limit.

24. "Low flash point liquids" means liquids with a flash point below 60°C.

25. "Main tank valve" means a remote operated valve on the FC fuel outlet from a FC fuel storage tank, located as close to the tank outlet point as possible.

26. "MARVS" means the maximum allowable relief valve setting.

27. "Master fuel valve" means an automatic valve in the FC fuel supply line to each fuel cell lo- cated outside the FC space and as close to the FC fuel heater (if fitted) as possible.

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28. "Open deck" means a deck that is open on both ends, or is open on one end and equipped with adequate natural ventilation that is effective over the entire length of the deck through permanent openings distributed in the side panels or in the deck above.

29. "Oxidant processing system" means a system that meters, conditions, processes and pressurizes the incoming oxidant (generally air) supply for use within the fuel cell system, with pressure, tem- perature, hygrometry, purity and flow rate within the ranges accepted by the fuel cell system.

30.

31.

"Risk" means the expression of the danger that an undesired event represents to persons, to the environment or to material property. The risk is expressed by the probability and consequences of an accident.

"Recognized standards" means applicable international or national standards acceptable to the Society or standards laid down and maintained by an organization which complies with the stand- ards adopted by the Organization and which is recognized by the Society.

32. "Safety management system" means the international safety management system as described in the ISM Code.

33.

"Second barrier" means a technical measure which prevents the occurrence of a hazard if the first barrier fails, e.g., second housing of a tank protecting the surroundings from the effect of tank leaks.

34. "Semi-enclosed space" means a space limited by decks and/or bulkheads in such manner that the natural conditions of ventilation are notably different from those obtained on open deck (refer also to IEC 60092-502 Electrical Installations in Ships-Tankers-Special Features).

35. "Source of release" means any valve, detachable pipe joint, pipe packing, compressor or pump seal in the FC fuel system.

36.

37.

38.

103.

1.

"Tank room" means the gastight space surrounding the FC fuel tank, containing all tank con- nections and all tank valves.

"Thermal management system" means a system that provides cooling and heat rejection to maintain thermal equilibrium within the fuel cell system, and may provide for the recovery of ex- cess heat and assist in heating the power train during start-up.

"Water management system" means a system that provides the treatment and purification of recovered or added water for use within the fuel cell systems.

Class notations

Ships satisfying the requirements of this Guidance may be given a notation as additional special feature notations as follows:

(1) Where the fuel cell power is used for propulsion, essential or emergency services, a notation "FC-PWR" may be assigned.

(2) Where the fuel cell power is not used for propulsion, essential or emergency services, a nota-

tion "FC" may be assigned.

104. Equivalence

Special equipment, which is not appropriate to apply the requirements of this Guidance or not specified in this Guidance, may be accepted by the Society provided that the Society is satisfied that such equipment is equivalent to or above those complying with the requirements of this Guidance.

105. Exclusion from the Guidance

The Society cannot assume responsibility for other technical characteristics for fuel not covered by this Guidance. However, the Society may advise on such matters upon

cell systems application.

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