46 CFR § 179.220 - Location of watertight bulkheads for subdivision.
(a) The maximum distance between adjacent main transverse watertight bulkheads on a vessel, required by § 179.212(a) of this part to comply with this section, must not be more than the smaller of the following:
(1) One third of the length of the bulkhead deck; or
(2) The distance given by the following equation:
Table 179.220(a)—Table of Floodable Length Factors
(x/L) × 100 | F |
---|---|
0-15 | 0.33 |
20 | 0.34 |
25 | 0.36 |
30 | 0.38 |
35 | 0.43 |
40 | 0.48 |
45 | 0.54 |
50 | 0.61 |
55 | 0.63 |
60 | 0.58 |
65 | 0.53 |
70 | 0.48 |
75 | 0.44 |
80 | 0.40 |
85 | 0.37 |
90-100 | 0.34 |
Note 1: Where: x = distance in meters (feet) from the midpoint of the compartment to the forward-most point on the bulkhead deck excluding sheer; and L = length over deck in meters (feet) measured over the bulkhead deck.
Note 2: Intermediate values of floodable length factor may be obtained by interpolation.
(b) The effective freeboard for each compartment is calculated by the following equation:
(c) Calculations needed to demonstrate compliance with paragraphs (a) and (b) of this section must be submitted to, and approved by, the Commanding Officer, Marine Safety Center.