对于无人机舱的船舶,有另一个要求涉及到阀的操纵杆的高度问题的规定是:
The controls of sea inlet and discharge valves shall be sited so as to allow reaching and operating sea inlet and discharge valves in case of ingress of water within 10 minutes after triggering of the bilge alarm. 因此,船检时常会要求提供一个计算,机舱淹水10分钟后的水位高度,海水进排口的阀,如果是手动阀,其阀杆应高于此计算高度;如果是液压启闭的,该阀的操纵位置要高于计算高度。