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发表于 2007-11-21 21:56
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来自： 中国上海
class不关心放水塞，船东意愿，他想有就有，想没就没。如果你非要有，形势一般有A, B两种。事实上审图不会看放水塞。
请看下面规范如何说
Section 11 Drain plugs
11.1 General
11.1.1. Drain plugs are not normally a classification matter, but if they are fitted Surveyors should be guided by the following. （说了，不是class项目）
11.1.2. Drain plugs are acceptable in double bottoms or other tanks, but should not be fitted in open spaces such as bilges or wells. （可以在双层底或其他舱里，没说只有液舱才能有）
11.1.3. Where the shell plating is greater than 12,5 mm, then plugs of type A may be fitted, see Fig. 6.11.1.
11.1.4. Where the shell plating is less than 12,5 mm, then an adequate pad or doubling is to be fitted in way of plugs, so that the maximum number of threads is obtained with screwed plugs, Type B, see Fig. 6.11.1.
11.1.5. Where the plugs stand proud of the shell plating, then some form of tapered chafing or protection ring should be fitted externally. Where the underside of the pad is recessed to ensure the plug head is flush with the shell, the minimum thickness of the pad is not to be less than the shell thickness.
11.1.6. All welds in way of drain plugs are to be inspected visually and checked with a suitable NDE method.
11.1.7. For identification purposes, plugs with square heads are often fitted to oil tanks and hexagonal heads for water tanks. （请记住一般4角油舱，6角水舱）
11.1.8. Drain plugs should be kept clear of docking blocks, welded seams or butts, flat of keel, suction strums or any other arrangements inside tanks.
11.1.9. Tank numbers, etc. may be welded adjacent to each plug for identification purposes.
11.1.10. Where pads are to be fitted on higher tensile steel, then the pads should be of the same grade of steel.
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