Section 5 Machinery casings and fuel oil bunkers

5.1.1 The scantlings and arrangements of exposed casings protecting machinery openings are to be in accordance with Pt 3, Ch 8, 2 Scantlings of erections other than forecastles.

5.1.2 The minimum scantlings of protected casings are to be in accordance with Table 7.5.1 Protected machinery casings.

Table 7.5.1 Protected machinery casings

Item	Minimum scantlings
Plating:
In way of cargo hold spaces
In way of accommodation spaces
Stiffeners
Symbols
k = higher tensile steel factor, see Pt 3, Ch 2, 1.2 Steel
= effective length of stiffening member, in metres, see Pt 3, Ch 3, 3.3 Determination of span point
s = spacing of stiffeners, in mm
t = thickness, in mm
Z = section modulus of stiffening member, in cm3, see Pt 3, Ch 3, 3.2 Geometric properties of section
Note In no case is the depth of the stiffener to be less than 60 mm.

5.1.3 Where casing stiffeners carry loads from deck transverses, girders, etc. or where they are in line with pillars below, they are to be suitably increased, see also Pt 4, Ch 1, 4 Deck structure.

5.1.4 Where casing sides act as girders supporting decks over, care is to be taken that access openings do not seriously weaken the structure. Openings are to be effectively framed and reinforced if found necessary. Particular attention is to be paid to stiffening where the casing supports the funnel or exhaust uptakes.

5.2.1 Fuel oil bunkers situated within the machinery space are generally to comply with the requirements given in Pt 4, Ch 1 General Cargo Ships or Pt 3, Ch 9 Special Features, as appropriate.