Section 4 Subdivision and Arrangement

401. General

1. The hull is to be subdivided into watertight compartments as required for the requested service and type notation.

2. The accommodation is to be designed and arranged so as to protect the persons onboard from un- favourable environmental conditions and to minimize the risk of injury during normal and emer- gency conditions.

3. Controls, electrical equipment and other items from which injury to person could result, are to be adequately shielded, isolated, or otherwise protected.

4. Operating controls in the accommodation are to be located and protected so that their operation is unlikely to be impeded by person not concerned during emergency.

5. An intercommunication system and a general alarm system are required between the bridge and main accommodation area.

6. All furniture items are to be permanently attached to the structure of the Yacht.

7. The furniture and it's attachments are to be designed to withstand corresponding to the design acceleration.

8. Seating furniture is to be arranged to provide safety for the persons onboard during operation at high speed.

9. In Yacht with a design acceleration exceeding 2.5 g, safety belts are to be provided for all seats or supports from where the Yacht can be operated.

10. Safety belts are to be considered for seats in open deck areas for Yacht with design acceleration

1.5 g if these are used at sea at high speed.

11. Provisions are to be made to prevent shifting of baggage, trunks, suitcase, stores etc.

12. Controls, electric equipments or other items, the damage or failure of which could affect are not located in baggage or store compartments unless such items are adequately protected so that they cannot be damaged or inadvertently operated by movement of the contents of the compartment.

13. Decks, walkways, stairs etc. may be required to be of non-skid type. However, wood, vanish, paint etc will be accepted when normal passageway is arranged to prevent falling overboard.

14. Areas on deck intended for normal use and operation of the Yacht are to be arranged with ad- equate railing of sufficient height.

15. Entrance, stair, gangway etc. are to have handholds on one side at least.

402. Transverse watertight bulkheads

1. The following transverse watertight bulkheads are to be fitted in all yacht :

(1) A collision bulkhead

(2) A bulkhead at each end of the machinery space(s)

2. The watertight bulkheads are in general to extend to the freeboard deck. Afterpeak bulkheads may, however, terminate at the first watertight deck above the load line.

3. The watertight bulkheads in way of the raised quarter or sunken forecastle deck is to extend to the side deck.

4. For yacht with two continuous decks and a large freeboard to the uppermost deck, the following provisions apply.

(1) When the draught is less than the depth of the second deck, only the collision bulkhead need extend to the uppermost continuous deck. The remaining bulkheads may terminate at the second deck.

(2) When the draught is greater than the depth to the second deck, the machinery bulkheads, with the exception of the afterpeak bulkhead, are to be watertight to the uppermost continuous deck.

5. In yacht with a raised quarter deck, the watertight bulkheads within the quarter deck region are to extend to this deck.

403. Collision bulkhead

1. The distance from the forward perpendicular to the collision bulkhead is to be taken between the limits. However, for the wave piercer, the distance shall be in accordance with Society satisfactions.

minimum m

= length (m ) of the yacht

2. Minor steps or recesses in the collision bulkhead are to be accepted, provided the requirements to minimum and maximum distances from the forward perpendicular comply with Par 1.

3. For yacht having complete or long forward superstructures, the collision bulkhead is to extend to the deck above the freeboard deck. The extension need not be fitted directly over the bulkhead be- low, provided that the requirements to distances from the forward perpendicular are complied with, and that the part of the freeboard deck forming the step is watertight.

4. For Yachts with a long bow overhang (minimum), see Par 1, may be taken as zero provided that no part of the bulkhead forward of 0.05 (m ) is closer to the stem profile line than 0.03

measured perpendicular to the stem line.

404. Openings and closing appliances

1. Openings may be accepted in watertight bulkheads except in that part of the collision bulkhead sit- uated below the freeboard deck.

2. Openings situated below the freeboard deck are to have watertight doors with signboards fitted on each door stipulating that the door be kept closed while the yacht is at sea.

3. Openings in collision bulkhead above the freeboard deck are to have watertight doors or an equiv- alent arrangement. The number of openings in the bulkhead are to be the minimum that are com- patible with the yacht design and normal operation.

4. Doors in watertight bulkheads are to be complied with the followings :

(1) Doors may be hinged or sliding.

(2) They are to be shown by suitable testing to be capable of maintaining the watertight integrity of the bulkhead.

(3) Such testing is to be carried out for both sides of the door and shall apply a pressure head 10

% greater than that determined from the minimum permissible height of a down flooding opening.

(4) Testing may be carried out either before or after the door is fitted into the yacht but, where shore testing is adopted, satisfactory installation in the yacht is to be verified by inspection and

hose testing.

5. Type approval may be accepted in lieu of testing individual doors, provided the approval process includes pressure testing to a head equal to, or greater, than the required head (refer to above 4.).

6. All watertight doors are to be capable of being operated when the yacht is inclined up to 15° and fitted with means of indication in the operating compartment showing whether they are open or closed. All such doors are to be capable of being opened and closed locally from each side of the bulkhead.

7. Watertight doors are to remain closed when the yacht is at sea, except that they may be opened for access. A notice shall be attached to each door to the effect that it is not to be left open.

8. Watertight doors are to be capable of being closed by remote control from the operating compart- ment in not less than 20 s and not more than 40 s, and are to be provided with an audible alarm, distinct from other alarms in the area, which will sound for at least 5 s but no more than 10 s be- fore the doors begin to move whenever the door is closed remotely by power, and continue sound- ing until the door is completely closed.

9. The power, control and indicators are to be operable in the event of main power failure, as re- quired by Pt 6 of the Rules. In passenger areas and areas where the ambient noise exceeds 85 dB A the audible alarm is to be supplemented by an intermittent visual signal at the door.

10.

11.

12.

If the Administration is satisfied that such doors are essential for the safe work of the yacht, hinged watertight doors having only local control may be permitted for areas to which crew only have access, provided they are fitted with remote indicators as required by above mentioned 6.

Where pipes, scuppers, electric cables, etc. are carried through watertight divisions, the arrange- ments for creating a watertight penetration are to be of a type which has been prototype tested under hydrostatic pressure equal to or greater than that required to be withstood for the actual location in the yacht in which they are to be installed. The test pressure is to be maintained for at least 30 min with 10 % greater than that determined from the minimum permissible height of a downflooding opening and there should be no leakage through the penetration arrangement during this period.

Watertight bulkhead penetrations which are effected by continuous welding do not require proto- type testing. Valves on scuppers from weathertight compartments, included in the stability calcu- lations, are to have arrangements for remote closing from the operating station.

13. Where a ventilation trunk forms part of a watertight boundary, the trunk is to be capable of with- standing the water pressure that may be present taking into account the maximum inclination an- gle allowable during all stages of flooding.

405. Cofferdams

The installation of cofferdams is to be carried out in accordance with the Rules for Classification of Steel ship, Pt 3, Ch 15, 304.

406. Hydrostatic and watertight tests

In the Classification Survey during Construction, hydrostatic and watertight tests are to be carried out in accordance with the Rules for Classification of Steel Ship, Pt 3, Ch 1, 209.

407.

Hull side and stern doors

1. These requirements cover service doors in the Yacht's sides and stern below the bulkhead deck, in- tended for use in harbour and at anchor.

2. In general the side and stern doors are to ensure tightness and structural integrity with the sur- rounding structure.

3. Openings in the hull are to have well rounded corners and adequate compensation is to be ar- ranged with Web frames at the sides and equivalent structures above and below.

4. Local reinforcements are to be provided where arms and hinges are attached to the hull.

Large doors are normally to be arranged in such a way that the sea pressure is transferred di- rectly to the hull coaming. Means to be provided to prevent movement of the closed door relative to the structure of the Yacht.

5. Where the sill of a door in the sides or in the stern is close to the deepest waterline, consideration is to be given to prevent ingress of water to the hull compartment or spreading water on the deck in the opened compartment when the door is being used. Normally the sill height of door openings

in the sides or in the stern are

to be 380 mm above the deepest waterline. Any side and stern

door is to open a water sluice, i.e. a watertight compartment which is properly

Openings in the sluice leading into the Yacht are to be have watertight closing hight not less than 230 mm .

drained overboard.

appliance with sill

6. Where the sill of a door in the sides or in the stern is below the deepest waterline, i.e. where for a special basin direct entrance from the sea level etc. is arranged into hull, the arrangement will require a special consideration to ascertain that the safety of the Yacht is no way impaired.

408. Integrity of superstructure

1. Where entry of water into structures above the datum would significantly influence the stability and buoyancy of the yacht, such structures are to be one of the followings:

(1) of adequate strength to maintain the weathertight integrity and fitted appliances; or

(2) provided with adequate drainage arrangements; or

(3) an equivalent combination of both measures.

2. Weathertight superstructures and deckhouses located above the datum are to have means of closing openings with sufficient strength such as to

with weathertight closing

in the outside boundaries maintain weathertight in-

tegrity in all damage conditions where the space in question is not damaged. Furthermore, the

means of closing are to be such as to maintain weathertight integrity in all operational conditions.

409.

Doors, windows, etc., in boundaries of weathertight spaces

1. Doors, windows, etc., and any associated frames and mullions in weathertight superstructures and deckhouses are to be weathertight and are not to leak or fail at a uniformly applied pressure less than that at which adjacent structure would experience permanent set or fail.

2. For doors in weathertight superstructures, hose tests are to be carried out with a water pressure which is in accordance with Table 3.1.1 in Pt 3, Ch 1 of the Rules for Classification of Steel Ship.

3. The height above the deck of sills to doorways leading to exposed decks are to be as high above the deck as is reasonable and practicable, particularly those located in exposed positions. Such sill heights are to in general not be less than 100 mm for doors to weathertight spaces on decks above the datum, and 250 mm elsewhere. For yacht of 30 m in length and under, sill heights may be re- duced to the maximum which is consistent with the safe working of the yacht.

4. Windows are not to be permitted in the boundaries of special category spaces or ro-ro spaces or below the datum. If required by restrictions in the Permit to Operate, forward facing windows, or windows which may be submerged at any stage of flooding shall be fitted with hinged or sliding storm shutters ready for immediate use.

5. Side scuttles to spaces below the datum are to be fitted with efficient hinged deadlights arranged inside so that they can be effectively closed and secured watertight.

6. No side scuttle is to be fitted in a position so that its sill is below a line drawn parallel to and one metre above the design waterline.

410. Indicators and surveillance

1. Indicators are to be provided in the operating compartment for all shell doors, loading doors and other closing appliances which, if left open or not properly secured, could lead to major flooding in the intact and damage conditions.

2. The indicator system is to be designed on the fail-safe principle and shall show by visual alarms if the door is not fully closed or if any of the securing arrangements are not in place and fully locked, and by audible alarms if such door or closing appliance becomes open or the securing ar- rangements become unsecured. The indicator panel in the operating compartment is to be equipped with a mode selection function 'harbour/sea voyage' so arranged that an audible alarm is given in the operating compartment if the yacht leaves harbour with the bow doors, inner doors, stern ramp or any other side shell doors not closed or any closing device not in the correct position.

3. The power supply for the indicator systems is to be independent of the power supply for operating and securing the doors.

4. Television surveillance and a water leakage detection system are to be arranged to provide an in- dication to the operating compartment and to the engine control station of any leakage through in- ner and outer bow doors, stern doors or any other shell doors which could lead to major flooding.