规定了焊接到船舶结构上的一系列成型环形成的钢制狗形阶梯的尺寸、设计和结构、材料和饰面质量。这些梯子用于树干、深舱、货油舱底部等。交叉参考:BS 499:第2部分*BS 729*BS 1856*BS 4360*

Specifies the dimensions, design and construction, materials and quality of finish for steel dog-step ladders formed from a series of shaped rings welded to the ships' structure. These ladders are intended for use in trunks, deep tanks, cargo oil tank bottoms, etc.Cross References:BS 499:Part 2*BS 729*BS 1856*BS 4360 *