CSR
Ref. SOLAS Reg.II-1/3-6 .5.1 (Resolution MSC.151(78)) and IACS UI SC191
For access through horizontal openings, hatches or manholes, the dimensions are to be sufficient to allow a person wearing a self-contained air-breathing apparatus and protective equipment to ascend or descend any ladder without obstruction and also provide a clear opening to facilitate the hoisting of an injured person from the bottom of the space. The minimum clear opening is to be not less than 600 mm × 600 mm, with corner radii up to 100 mm maximum.(请注意红色字体文字内容)
问题1:为了保证穿戴自呼吸装置的人或者伤员的担架通过,至少净600mm。
问题2:安装这种直梯应该按照船级社认可的国际或国家标准,但我没有找到。我个人理解:假如往里移进去100mm(尽管允许的可能性很低),虽然满足了600mm的要求,但是由于最上面的一档踏步离甲板距离很小,估计只有150mm左右,而后面任然有那根障碍纵骨,估计此处净开口还是达不到600mm;而且按照上面红色字体的要求,也无法保证保证穿戴自呼吸装置的人或者伤员的担架通过的。