Loading conditions including ice load are to satisfy the applicable stability requirements.
202 The ice weight distribution is to be taken at least:
― 300 kg/m2 on forecastle deck and exposed cargo deck
― 200 kg/m2 on top of containers carried on cargo deck
203 The weight of ice on vertical surfaces has been taken into account and included in 202 and need not be calculated separately.
C. Anti-icing and Deicing Arrangements and Equipment.
C 100 General.
101 Arrangements and methods for anti-icing and deicing will be considered for approval in each case. Manual deicing may be accepted to a limited extent when such procedure is found to be capable of serving its purpose satisfactorily.
102 For category I equipment/areas anti-icing arrangements are required with sufficient to keep the equipment/ereas free from ice (generally be means of heating or cover) at all times in the service areas and under icing conditions specified (see A 100 and A 200).
103 For category II equipment/areas deicing arrangements are required with sufficient capacity for removal of accreted ice within a reasonable period of time (normally 4-6 hours) under icing conditions specified.
104 Heating power capacity for anti-icing and deicing is not to be less than:
― 300W/m2 for open deck areas, helicopter decks, gangways, stairways, etc.
― 200 W/m2 for superstructures.
― 50 W/m for railings with inside heating.
Heating capacities for other areas will be considered in each individual case.
105 In arrangement with electric heating cables or heating pipes with fluids as heating medium, special attention is to be paid to the heat transfer from the cables or pipes to the equipment/structure to be heated. The spacing of cables or pipes is to be appropriate for efficient heating. The fastening of cables or pipes is to be such that the heat will be readily dissipated to the equipment/structure to be heated.
106 Switchboard for anti-icing and deicing is to be arranged as required for distribution switchboards. A wattmeter or amperemeter, indicating the total load is to be installed on the switchboard. Marking on the switchboard is to state the load on each circuit, as well as the total load.
All circuits are to have earth failure monitoring with alarm. Energized circuits are to be indicated by means of a signal lamp for each circuit.
Heating cables with two conductions are to have overcurrent protection, set to release at max. 125% of the rated current of the circuit. It self-limited cables are used, the overcurrent protection may be omitted.
Motors on open deck, being part of Category I or Category II equipment, are to be naturally cooled, i.e. without external fan.
The electrical installation is also to comply with the Rule requirements for main class Pt.4 Ch.4《Electrical Installation》.
107 For anti-icing and deicing arrangements applying heating by fluids in pipes, the valves are to be marked with equipment/area to be heated, and open/closed position of the valves is to be indicated. Pumps applied for anti-icing purpose (Category I equipment/areas) are to be arranged with redundancy. The piping systems for anti-icing and deicing purposes are also to comply with the Rules for main class PT.4 Ch.1《Machinery and Systems Design, General》.
C 200 Class notation DEICE.
201 The equipment/areas specified below, which by definition (see A 500) are of Category I , are to have anti-icing arrangements, normally by heating or cover. Other means for anti-icing may be accepted upon special consideration, if not interfering with the proper functioning of the vessel.
― Communication equipment (i.e. antennas).
― Scanning equipment (Rader).
― Window in wheelhouse necessary for safe navigation and steering.
― Navigation lights.
― Equipment necessary for maintaining propulsion (i.e. cooling water sea chests).
― Water distribution system for fire extinction.
― Special equipment essential for safety, depending on type of vessal
― Fire fighting lines monitors (if arranged for fighting fires in other vessels and offshore structures, e.g. class notation Fire Fighter).
― Anchors including windlass, chain and hawse pipe.
― Air pipe vent heads for tanks.
― Lifeboats with davits.
― Pick-up boats including launching area.
― Rafts.
― Escape exits.
― Storage facilities for lifesaving outfit, e.g. rescue suits, lines, etc., and for picks and similar equipment for deicing purpose.
202 The equipment/areas specified below, which by definition (see A 500) are of Category II, are to have deicing arrangement:
― Open deck areas.
― Gangaways and stairways.
― Helicopter deck (if any).
― Superstructure.
― Railings.
― Outdoor piping.
― Winches, also for anchor handling.
― Shark jaw and guide pins.
― Stern roller.
― Deck lighting equipment.
In addtion to the above, other operational equipment may be required to have deicing arrangement as found necessary.
C 300 Class notation DEICE/C for supply vessels.
301 The requirements given in 200 are to be complied with as applicable. In addition, the cargo deck area is to be arranged for proper handling of cargo under icing condtions.
302 The arrangement for deicing may be by heating or by appropriate removables/sliding covers for the cargo, or other suitable means. The cargo deck-lighting is also to be provided with deicing facilities.
C 400 Special equipment.
401 Protective clothing, safety lines, hand tools and similar equipment for deicing purposes are to be kept onboard. The quantity of the equipment is to be sufficient for the assumed extent of manual deicing.
402 The equipment for manual deicing is to be kept in storage facilities and at locations protected from accretion of ice by covers or other anti-icing arrangements.
C 500 Electric power generator capacity.
501 For calculation of required generator capacity (see rules for main class Pt.4 Ch.4 Sec.3 B 100), the power requirements for the heating arrangements are to be included as specified below:
― 100% of electric power needed for anti-icing purposes.
― 50% of electric power needed for deicing purposes.
