[Code of Federal Regulations]
[Title 46, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR45.65]
[Page 80]
TITLE 46--SHIPPING
CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
PART 45_GREAT LAKES LOAD LINES--Table of Contents
Subpart C_Freeboards
Sec. 45.65 Excess sheer limitations.
The decrease in freeboard allowed in Sec. 45.63 is limited as
follows:
Sheer Calculation--Table 4
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Station Actual ordinate S. M. Product
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After Half:
AP.................................... ........................... 1 ................................
L/6-AP................................ ........................... 3 ................................
L/3-AP................................ ........................... 3 ................................
Midship............................... ........................... 1 --------------
Sum of Aft Products
After Standard Sheer .2665L+26.65\1\.. ........................... ....... --------------
Difference: Sum-STD................... ........................... ....... -------------- +Excess/-
Deficiency
AFT Sheer: Diff/8..................... ........................... ....... -------------- Excess/Deficiency
Fwd. Half:
FP.................................... ........................... 1 ................................
L/6-FP................................ ........................... 3 ................................
L/3-FP................................ ........................... 3 ................................
Midships.............................. ........................... 1 --------------
Sum of Fwd Products
Fwd Standard Sheer .5330L+53.30\1\... ........................... ....... --------------
Difference: Sum-STD................... ........................... ....... -------------- +Excess/-
Deficiency
FWD Sheer: Diff/8..................... ........................... ....... -------------- Excess/Deficiency
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\1\ L in Standard Sheer=L or 500 whichever is less.
Sheer Summation
Aft Sheer --------------
Fwd Sheer --------------
Net Sheer --------------
Mean: Net-2 -------------- Excess/
Deficiency
(a) In vessels having no enclosed superstructure from 0.1 L abaft
amidships to 0.1 L forward of amidships, no decrease is allowed.
(b) In vessels having enclosed superstructures amidships less than
0.1 L before and abaft amidships, the decrease must be reduced by linear
interpolation.
(c) If excess sheer exists in the forward half, and the after half
is at least 75 percent of standard sheer, the full decrease is allowed.
If the after sheer is between 50 percent and 75 percent of standard
sheer an intermediate decrease, determined by linear interpolation, is
allowed for the excess sheer forward. If the after sheer is 50 percent
of standard or less, no decrease is allowed for the excess sheer
forward.
(d) Where an enclosed poop or forecastle is of standard height with
greater sheer than that of the freeboard deck, or is greater than
standard height, an addition to the sheer of the freeboard deck may be
made using the following formula:
S=vL'/3L
Where
s=sheer credit, to be deducted from the deficiency or added to the
excess of sheer.
v=difference between actual and standard height of superstructure at the
end ordinate.
L'=mean enclosed length of poop or forecastle up to a maximum length of
0.5 L.
The superstructure deck must not be less than standard height above this
curve at any point. This curve must be used in determining the sheer
profile for forward and after halves of the vessel.
(e) The maximum decreased for excess sheer must be no more than 1\1/
2\ inches per 100 feet of length.
(f) Where the deck of an enclosed superstructure has at least the
same sheer as the exposed freeboard deck, the sheer of the enclosed
portion of the freeboard deck cannot be taken into account.
[[Page 81]]