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发表于 2010-4-27 12:42
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来自： 中国山东济南
Scuppers and discharge pipes originating at any level and penetrating the shell either more than
450 mm (17.5 in.) below the freeboard deck or less than 600 mm (23.5 in.) above the summer load
waterline are to be provided with a non-return valve at the shell. This valve, unless required by 4-2-2/23.1,
may be omitted if the piping has a wall thickness at least equal to the thickness of the shell plating or
extra-heavy pipe (see 4-2-1/7.21), whichever is less.
4-2-2/23.1如下
Where, however, the vertical distance from the load water-line to the inboard end of the
discharge pipe exceeds 0.01L, the discharge may have two automatic non-return valves
without positive means of closing, provided that the inboard valves are always accessible for
examination under service conditions. The inboard valve is to be above the deepest load
waterline. If this is not practicable, then, provided a locally controlled stop valve is interposed
between the two non-return valves, the inboard valve need not be fitted above the deepest
load waterline.
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