Marine Engineering

According to SOLAS chapter 3, section 3 of regulation 31 in cargo ships when the horizontal distance from the extreme end of the stem or stern of the ship to the nearest end of the closest survival craft is more than 100m shall carry, in addition to the normal liferaft requirements a liferaft stowed as far as forward or aft as is reasonable and practicable. Such liferaft or liferafts may be securely fastened so as to permit manual release.

1.Any IC engine of cylinder diameter of 200 mm or a crankcase volume of 0.6 m3 and above shall be provide with crankcase relief valve of a suitable type with sufficient relief area. 2.In large engine, cylinder diameter more than 300mm, require one relief valve to be placed on each crankcase door. 3.In small engine, cylinder diameter not more than 300mm, crankcase door of which are usually very strong. It may have relief valve or valves at its end. 4.Its free area should not be smaller than 45cm2 and there shall be minimum of 115cm2 /m3 of the gross crankcase volume. 5.Spring setting for opening pressure is 0.07 bar at an internal pressure and will close when the pressure has been relieved. 6.The valves should open smartly and close positively and rapidly. 7. The relief valves shall be arranged or provided with means to ensure that discharge from them is so directed as to minimize the possibility of injury to personnel.