SOLAS requirements for crankcase doors are as follows12:
- An IC engine of over 200-mm bore or crankcase volume of 0.6 m³ and above, shall be provided with crankcase relief door with sufficient relief area.
- Opening pressure = 1/15 bar (0.07 bar) above Atmospheric pressure, but ≯ 3∼7 bar of explosion pressure.
- Free area of each relief valve ≮ 45 cm².
- In large engine, cylinder dia. over 30cm, It required one relief valve to be placed on each crankcase door.
- Its free area should not smaller than 45cm2and there shall be minimum of 115cm2/m3of the gross crankcase volume.
- Spring setting for opening pressure is 0.07 bar at an internal pressure and will close when the pressure has been relieved.
