4. DET NORSKE VERITAS DEICING/ANTI-ICING SYSYTEM
SECTION 5
DEICING/ANTI-ICING SYSTEMS―TENTATIVE RULES
Contents.
A General
A 100 Application.
A 200 Assumption.
A 300 Classification.
A 400 Scope.
A 500 Definitions.
A 600 Documentation.
A 700 Testing.
B. Stability and Watertight Integrity.
B 100 General.
B 200 Icing stability.
C. Anti-icing and Deicing Arrangements and Equipment.
C 100 General.
C 200 Class notation DEICE.
C 300 Class notation DEICE/C for supply vessels.
C 400 Special equipment.
C 500 Electric power generator capacity.
A General
A 100 Application.
101 The requirement in this Section apply to vessels intended for operation in cold climate areas.
102 The requirements are supplementary to those given for the main class.
A 200 Assumption.
201 The icing as caused by sea spray and/or atmospheric water (snow, rain and fog) is asuumed to be moderate, corresponding to an ice layer accretion of 6cm per hour.
A 300 Classification.
301 Vessels with systems and equipment complying with the relevant requirements specified in the following may be given the class notaiton DEICE or DEICE/C as appropriate.
A 400 Scope.
401 The requirements for the class notation DEICE are aimed at maintenance of the following functions and properties of the vessel and its equipment under icing conditions:
― main functions ( see Pt. 1 Ch. 1 Sec.2),
― manoeuvability,
― stability,
― crew safety (rafts, lifeboats, ganways, etc.).
402 The requirements for the class notation DEICE/C have the same basic scope as given in 401. In addtion, it is aimed at facilitation of deck cargo handling under icing conditions (offshore supply vessels).
A 500 Definitions.
501 The equipment and areas requiring measures against ice acceretion are divided into the two categories:
― Category I.
― Category II.
502 Category I equipment areas are defined as equipment/areas necessary for:
― Navigation.
― Steering.
― Propulsion.
― Anchoring.
― Lifesaving.
503 Category II equipment/areas are defined to comprise:
― Decks and superstructures.
― Helicopter decks.
― Railings.
― Cargo deck area (class natation DEICE/C).
A 600 Documentation.
601 The following plans and particulars are to be submitted for approval:
― Arrangement of anti-icing and deicing equipment for the various areas. Heating capacities are to be specified.
― Electrical single line distribution diagrams for anti-icing and deicing equipment with information about:
― full load.
― cable type and cross section.
― make/type/rating of fuse and switch gear.
― make/type/rating of heating cable.
― Electical schematic diagram, for all control and instrumentation circuits, with information on make/type/rating of all equipment.
― Fastening arrangement and spacing of electrical cables and fluid pipes for heating purposes.
― Mechanical deicing arrangements, methods and location.
― Storage facilities and specification of hand tools for manual ice removing, protective clothing, lines, etc., to be carried onboard.
― Test program for anti-icing and deicing sysytems.
602 The following manuals are to be submitted for approval and are to be kept onboard:
― Manual for anti-icing precautions and deicing procedures.
― Stability manual (see also B) including load conditions with ice acceretion.
A 700 Testing.
701 After completed installation the anti-icing and deicing systems are to be tested to the satisfaction of the Society. A test program is to be proposed by the builders for approval by the Society.
B. Stability and Watertight Integrity.
B 100 General.
101 The vessels are in any intended service condition, including additional weights due to accretion of ice as specified in 200 below, to be able to satisfy the intact and damage stability criteria given in Pt.5 Ch.7 Sec.3 D (for the class notation SF ), as far as applicable.
B 200 Icing stability.
201 The ice load as calculated according to 202-203 is to be included in the loading conditions.
