Section 2 Centre Girders

201. Construction and Scantlings

1. Centre girders are to extend from the collision bulkhead to the aft peak bulkhead as far as practicable.

2. The thickness of web of centre girders is not to be less than obtained from the following formula.

However, beyond the midship part, the thickness may be gradually reduced toward the ends and to

may be 0.85 times the midship value for the end parts:

ᾼ Ņ LǾĨÃ Ñ ĨǾK Nmm Ń

3. The breadth and thickness of the face plates are not to be less than obtained from the following formulae respectively. However, beyond the midship part, the sectional area of the face plates may be gradually reduced toward the ends and it may be 0.8 times the midship value of the end parts:

Thickness : LǾĨ Ã Ñ ĨǾK Nmm Ń

Breadth : ĨÃ Ñ ĮL Nmm Ń

4. The webs of centre girders are to extend to the top of floors of bottom transverse girders.

5. In the engine room, the thickness of webs and face plates of centre girders are not to be less then

1.25 times the values specified in the preceding 2 and 3, respectively.

6. For ships with hat-type keel of suitable height, the centre girder may be omitted.