Section 10 Hull Equipment

1001. Mooring systems for temporary mooring

1. The mooring systems for temporary mooring specified in Rules for Classification of Mobile Offshore Drilling Units need not be fitted. In cases where the Society deems such necessary in consideration of the form of unit operations, the mooring systems for temporary mooring specified in Rules for Classification of Mobile Offshore Drilling Units are required.

2. In the case of single-point mooring systems to moor shuttle tankers, the chafing chain used ends for mooring lines are to be fitted and are to comply with the following:

(1) The chafing chain is to be the offshore chain specified in Pt 4 of Rules for the Classification of Steel Ships, and the chain standard is short lengths (approximately 8 m ) of 76 mm diameter.

(2) The arrangement of the end connections of chafing chains is to comply with any standards

deemed appropriate by the Society.

(3) Documented evidence of satisfactory tests of similar diameter mooring chains in the prior six month period may be used in lieu of breaking tests subject to agreement with the Society.

3. Equipment used in mooring systems to moor at jetty etc. in order to install plant or mooring equipment for the mooring support ships and shuttle tankers, except for the equipment specified in Par 2 above, is to be as deemed appropriate by the Society.

1002. Guardrails

1. The guardrails or bulwarks specified in Pt 4 of Rules for the Classification of Steel Ships are to be provided on weather decks. In cases where guardrails will become hindrances to the tak- ing-off and landing of helicopters, means to prevent falling such as wire nets, etc. are to be provided.

2. Freeing arrangements, cargo ports and other similar openings, side scuttles, rectangular windows, ventilators and gangways are to be in accordance with the requirements for tankers specified in Pt 4 of Rules for the Classification of Steel Ships.

3. Ladders, steps, etc. are to be provided inside compartments for safety examinations as deemed ap- propriate by the Society.

1003. Fenders

1. Suitable fenders fore contact with the gunwales of other ships such as support ships, tug boats, shuttle tankers, etc. are to be provided.

2. The most common fender used for side-by-side transfer operations is the high pressure pneumatic type. These fenders are generally favoured for their robustness and longevity. The low pressure pneumatic type have been found useful for emergency situations where ease of transport is a first priority. However, they can have the disadvantage of much shorter life in service. Foam filled fend- ers are not commonly used but owing to lighter construction they can have advantages when used as secondary fenders.

3. Fender size will also be dictated by the freeboard of the ships, and the diameter of each floating fender should be no more than half the minimum freeboard of the smaller ship.

4. Fenders used in side-by-side transfer operations offshore are divided into two categories:

(1) Primary fenders which are positioned along the parallel body of the ship to afford the maximum possible protection during mooring and unmooring.

(2) Secondary fenders which may be used to protect bow and stern plating from inadvertent contact during mooring and unmooring.

5. For the details, Ship to Ship Transfer Guide(Liquefied Gases) issued by OCIMF is to be referred.