Section 7 Cooling Water System

701. Cooling water system

1. Where main engines and essential auxiliary engines are cooled with water, the cooling system is to be so arranged that the stand-by cooling water pumps can be used even if one of the cooling wa- ter pumps is out of use.

2. Where two or more main engines operating respectively are provided, and where it is possible to give a navigable speed even if one of the engines attached with their own cooling water pumps is out of order, the stand-by cooling water pumps may be omitted.

3. In case of engines attached with their own cooling water pumps, the stand-by cooling water pumps may be omitted.

4. The sea inlet lines are to be provided with strainers which can be cleaned without interruption to the sea water supply. In application to "strainers which can be cleaned without interruption to the sea water supply", following may be accepted as complied system.

(1) For multi propeller ships and where single strainer is fitted between the sea water suction valves and the cooling water pump of internal combustion engine which coupled with each shafting system

(2) Where two or more the independent driven engines are coupled with one shafting system and single strainer is fitted in the individual engine

(3) Where two or more internal combustion engines driving essential auxiliary machinery are in-

stalled and single strainer is fitted in the individual engine.

5. In following small crafts, these strainers may be omitted with approval of the Society.

(1) for a yacht of less than 30 m in length

(2) for a yacht of 30 m and more but less than 50 m in length subject to an internal combustion engine used for driving essential auxiliaries.

6. Sea water cooling systems for main engines and essential auxiliary engines are to be connected to two sea inlets parted respectively as far as practicable.