Section 2 Internal Combustion Engines

201. General construction

1. The frames and bedplates are to be of rigid and oiltight construction and bedplates are to be fixed securely to the engine seatings.

2. Ventilation of crankcase and any arrangement which could produce a flow of external air within the crankcase, is forbidden except case of (1) and (2).

(1) Where vent pipes are provided to crankcase: In this case, the diameters of these pipes are. to be as small as practicable.

(2) Where a forced extraction of the gases from the crankcase is provided: In this case, the vacuum in the crankcase is not to exceed 25 mm of water head.

3. Crankcase and its doors are to have sufficient strength, and the doors are to be securely fastened, so that they will not be readily displaced by an explosion.

202. Safety devices 【See Guidance】

1. Where risk from over-speeding of machinery exists, means are to be provided to ensure that the safe speed is not exceeded.

2. Engines having cylinder of large bore size are to be provided with a relief valve or warning device of an approved type for prevention of overpressure in the cylinder, and also to be provided with crankcase explosive relief valve of an approved type.

203. Installation

1. Where the structures above engines and their surroundings are constructed with combustible materi- als, adequate measures are to be taken in protection against fire.

2. Engines located on the weather deck are to be provided with ventilated metal hoods or to be in-

Rules for the Classification of Steel Barges 2015 73

stalled in well ventilated deckhouses of steel.

204. Exhaust gas pipe arrangement

1. Exhaust gas pipes and silencers are to be water cooled or are to be effectively insulated.

2. Silencers are to be so arranged that they may be easily cleaned.

3. In principle, exhaust gas pipes of several engines are not to be connected together.

4. Exhaust gas pipe is to extend not less than 2.4 m above deck on barge intended to carry liquid cargo having a flash point 60 ℃ or below and to be provided with a suitable spark arrestor.