Iranian Classification Society Rules
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Section 2 Hatchway Openings
201 Height of Hatch Coamings
1. The height of hatch coamings above given in Table 16.1.
the upper surface of deck laminates is not to be less than
Table 16.1 Height of Hatch Coamings
Position of hatchway openings | Ã ≤ ĪL m | ĪL m P Ã ≤ ĮL m | ĮL m P Ã ≤ ĮJ m | |
Exposed hatchway openings | On the upper deck | 380 mm | 450 mm | 600 mm |
On the superstructure decks for 0.25Ã from the fore end | 380 | 450 | 600 | |
On the superstructure decks other than the above | 300 | 300 | 450 | |
Un-exposed hatchway openings | On the decks in the unenclosed superstructures except for specified below | 380 | 380 | 450 |
On the decks in superstructures without front bulkheads | 380 | 450 | 600 | |
2. With respect to hatchway opening which are maintained weathertight by clamping devices and closed with substantial weathertight covers, the height
means of gaskets and of hatch coamings may
be reduced from required in the preceding 1, subject to the approval by the Society.
202. Wooden Covers
Wooden covers are to be in accordance with the requirements in the following:
1. The finished thickness of wooden covers is not to be less than obtained from the following formula. Wooden covers intended to carry cargoes thereon are to be increased in thickness in direct proportion either where the tween deck height exceeds 2.6 m or where the weight per unit area of cargoes to be carried on the hatchway exceeds 18 tÕm Ī. In no case, however, is the finished thick- ness to be less than 48 mm .
ᾼ Ņ ĮL Ċ Nmm Ń
where,
Ċ : Spacing of hatch beams (m ).
2. Materials for wooden covers are to be of good quality, straight grained and reasonably free from knots, sapwood and shakes.
3. The ends of wooden covers are to be protected by circling steel bands.