[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: 46CFR69.111]

[Page 401-402]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 69_MEASUREMENT OF VESSELS--Table of Contents
 
                  Subpart C_Standard Measurement System
 
Sec. 69.111  Between-deck tonnage.

    (a) Defined. ``Between-deck tonnage'' means the tonnage of the space 
above the line of the tonnage deck and below the line of the uppermost 
complete deck.
    (b) Identifying the line of the uppermost complete deck. (1) If the 
uppermost complete deck runs in a continuous line from stem to stern, 
the line of the uppermost complete deck is the longitudinal line of the 
underside of the uppermost complete deck.
    (2) If the uppermost complete deck runs at different levels from 
stem to stern, the line of the uppermost complete deck is the 
longitudinal line of the underside of the lowest portion of that deck 
parallel with the upper portions of that deck. Spaces between the line 
of the uppermost complete deck and the higher portions of the deck are 
included in superstructure tonnage.
    (c) Method for calculating tonnage. The tonnage of each level of the 
between-deck space is calculated separately, as follows:
    (1) The length of each level is measured at the mid-height between 
the line of the deck above and the line of the deck below. Measure from 
the point forward where the continuation of the line of the inboard face 
of the normal side frames intersects the center line of the vessel aft 
to the forward face of the normal transom framing.
    (2) Divide the length under paragraph (c)(1) of this section into 
the same number of equal parts into which the tonnage length is divided 
under Sec. 69.109(g)(1).
    (3) Measure at mid-height between the faces of the normal side 
frames the inside breadth of the space at each end and at each point of 
division of the length. Number the breadths successively ``1'', ``2'', 
and so forth beginning at the bow.
    (4) Multiply the even numbered breadths by four and the odd numbered 
breadths by two, except the first and last, which are multiplied by one.

[[Page 402]]

    (5) Add together the products under paragraph (c)(4) of this section 
and multiply the sum by one-third of the interval between the points at 
which the breadths are taken. The product is the square foot area of the 
space at mid-height.
    (6) Multiply the area of the space at mid-height by the average of 
the heights taken each point of division of the space. The product 
divided by 100 is the tonnage of that space.
    (7) The between-deck tonnage is the sum of the tonnage of each level 
within the between-deck space.

[CGD 87-015b, 54 FR 37657, Sept. 12, 1989, as amended by CGD 97-057, 62 
FR 51045, Sept. 30, 1997]