Regulations for Scavange spaces & Crankshaft: Regulation Requirement Series

Regulation Requirement Series

"DESIGN AND CONSTRUCTION"

2. DESIGN AND CONSTRUCTION OF ENGINES

2.3 Crankshaft materials

In general, crankshafts are to be of forged steel having a tensile strength not less than 400 N/mm2 and not greater than 1000 N/mm2.

The use of forged steels of higher tensile strength is subject to special consideration by the Society in each case.

The Society, at its discretion and subject to special conditions (such as restrictions in ship navigation), may accept crankshafts made of cast carbon steel, cast alloyed steel of appropriate quality and manufactured by a suitable procedure having a tensile strength as follows:

between 400 N/mm2 and 560 /mm2 for cast carbon steel

between 400 N/mm2 and 700 N/mm2 for cast alloyed steel.

2.4 Cylinder overpressure gauge

Means are to be provided to indicate a predetermined overpressure in the cylinders of engines having a bore exceeding 230 mm.

2.5 Scavenge manifolds

2.5.1 Fire extinguishing 
For two-stroke crosshead type engines, scavenge spaces in open connection (without valves) to the cylinders are to be connected to a fixed fire-extinguishing system, which is to be entirely independent of the fire-extinguishing system of the machinery space.

2.5.2 Blowers 
Where a single two-stroke propulsion engine is equipped with an independently driven blower, alternative means to drive the blower or an auxiliary blower are to be provided ready for use.

2.5.3 Relief valves
Scavenge spaces in open connection to the cylinders are to be fitted with explosion relief valves in accordance with,

The free area of each crankcase explosion relief valve is not to be less       than 45 cm2. The aggregate free area of the valves fitted on an engine is     not to be less than 115 cm2 per cubic metre of the crankcase gross                 volume.Subject to the above provisions, each relief valve may be replaced     by not more than two relief valves of smaller area, provided the free area       of each valve is not less than 45 cm2.

Watch out for the next post on Regulation Requirements for...
Starting, Fuel and Charge air Systems Requirements

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