Section 2 Hatchways

201. Height of hatchway coamings

The height of coamings above the upper surface of deck is to be at least 600 mm in Position I and 450 mm in Position II. But, for barges of less than 30 m in length, the height of coamings may be as given in Table 17.1.

Table 17.1 Height of coamings for barges of less than 30 m in length (mm)

202. Construction of hatchway coamings

1. The thickness of hatchway coamings is not to be less than obtained from the following formula, but neednot exceed 11 mm.

ᾼ Ņ LǾLJ Ã Ñ ĴǾL (mm)

2. On the hatchway coamings, horizontal stiffeners are to be provided at an appropriate position, and the upper edges of the hatchway coamings are to be stiffened by half round bars or other suitable means.

3. The hatchway coamings are to be stiffened with efficient brackets or stays fixed with the horizontal

stiffeners specified in Par 2 and the deck at an interval of not greater than 3.0 m.

4. Where hatch covers of sliding type are provided, the hatchway coamings are to be suitably strengthened according to the weight of hatch covers.