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发表于 2015-9-8 17:25
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来自: 中国山东青岛
两回事吧,前面说的是所有情况都必须装防火闸,后面说的是ducts穿越某些处所的允许条件。不矛盾
7.2.1 The ventilation systems for machinery spaces of category A, vehicle spaces, ro-ro spaces, galleys,special category spaces and cargo spaces shall, in general, be separated from each other and from theventilation systems serving other spaces. Except that the galley ventilation systems on cargo ships of less than 4,000 gross tonnage and in passenger ships carrying not more than 36 passengers, need not be completely separated, but may be served by separate ducts from a ventilation unit serving other spaces.In any case, an automatic fire damper shall be fitted in the galley ventilation duct near the ventilation unit.Ducts provided for the ventilation of machinery spaces of category A, galleys, vehicle spaces, ro-ro spaces or special category spaces shall not pass through accommodation spaces, service spaces or control stations unless they comply with the conditions specified in paragraphs 7.2.1.1.1 to 7.2.1.1.4 or 7.2.1.2.1 and 7.2.1.2.2 below:
..............
or
.2.1 the ducts are constructed of steel in accordance with paragraphs 7.2.1.1.1 and 7.2.1.1.2;
and
.2.2 the ducts are insulated to "A-60" class standard throughout the accommodation spaces,
service spaces or control stations;
except that penetrations of main zone divisions shall also comply with the requirements of paragraph
4.1.1.8.
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