![]() The positions differentiate between regions which are more exposed than others. Hatch coamings Heights of coamings and cover closing arrangements in some instances depend on the hatch position. ![]() This means that most ships are fitted exclusively with the stronger stiffened self-supporting steel covers. Where portable beams are fitted with wood or light steel covers and tarpaulins, then the ship has an increased Type B freeboard, i.e. if steel pontoon type covers which are self-supporting and have no direct securing arrangements are fitted, then the standard Type B freeboard only is assigned. Under these regulations ships fitted with approved steel covers having direct securing arrangements may have reduced B-100 or B-60 freeboards if they meet the subdivision requirements, but in general they are assigned standard cargo ship Type B freeboards. Only the maximum permitted stresses and deflections of covers under specified loadings are given by the Load Line Rules. ![]() Lloyd's Register provides formulae for determining the minimum scantlings of steel covers, which will be within the requirements of the Load Line Rules. The basic regulations covering the construction and means of closing hatches in weathertight decks are contained within the Conditions of Assignment of Freeboard of the Load Line Rules 1968 (see Chapter 31).
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