46 CFR 179.220 - Location of watertight bulkheads for subdivision
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CFR > Title 46 > Chapter I > Part 179 > § 179.220. Location of watertight bulkheads for subdivision
Current as of: Oct. 2009
(a) The maximum distance between adjacent main transverse watertight bulkheads on a vessel, required by Sec. 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:
[GRAPHIC] [TIFF OMITTED] TR10JA96.009
where:d=the maximum length of the bulkhead deck in meters (feet) between adjacent main transverse watertight bulkheads;F=the floodable length factor from Table 179.220(a);f=the effective freeboard in meters (feet) calculated for each pair of adjacent bulkheads in accordance with paragraph (b) of this section;L=Length Over Deck in meters (feet) measured over the bulkhead deck; andD=the depth in meters (feet), measured amidships at a point one-quarter of the maximum beam out from the centerline, from the inside of the bottom planking or plating to the level of the top of the bulkhead deck at side as shown in Figure 179.220(a).
Table 179.220(a)--Table of Floodable Length Factors------------------------------------------------------------------------
(d/L) x 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: d=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. [GRAPHIC] [TIFF OMITTED] TC01MR91.037
(b) The effective freeboard for each compartment is calculated by the following equation:f=(a+b)/2where:f=the effective freeboard in meters (feet).a=the freeboard in meters (feet) measured:
(1) At the forward main transverse watertight bulkhead; and
(2) From the deepest waterline to:(i) The top of the bulkhead deck on a flush deck vessel; or(ii) If a vessel has a stepped bulkhead deck, the line shown in Figure 179.220(b); or(iii) If a vessel has an opening port light below the bulkhead deck, the line shown in Figure 179.220(c).b=the freeboard in meters (feet) measured:
(1) At the aft main transverse watertight bulkhead; and
(2) From the deepest waterline to: (i) The top of the bulkhead deck on a flush deck vessel; or(ii) If a vessel has a stepped bulkhead deck, the line shown in Figure 1 to Sec. 179.220(b); or[GRAPHIC] [TIFF OMITTED] TC01MR91.038 [GRAPHIC] [TIFF OMITTED] TC01MR91.039(iii) if a vessel has an opening port light below the bulkhead deck, the line shown in Figure 2 to Sec. 179.220(b).
[CGD 85-080, 61 FR 971, Jan. 10, 1996; 61 FR 20557, May 7, 1996]________________________________________________________________________
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