[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR170.290]

[Page 108-109]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 170_STABILITY REQUIREMENTS FOR ALL INSPECTED VESSELS--Table of Contents
 
                         Subpart I_Free Surface
 
Sec. 170.290  Free surface correction for damage stability calculations.

    (a) When doing the damage stability calculations required by this 
subchapter, the virtual increase in the vessel's vertical center of 
gravity due to liquids in tanks must be determined by calculating--
    (1) For each type of consumable liquid, the free surface effect of 
at least one transverse pair of wing tanks or a single centerline tank; 
and
    (2) The free surface effect of each partially filled tank containing 
other than consumable liquids.
    (b) For the purpose of paragraph (a)(1) of this section, the tank or 
combination of tanks selected must be those having the greatest free 
surface effect.
    (c) When doing the calculations in paragraph (a) of this section, 
the free surface effect of a liquid in a tank must be determined by--
    (1) Assuming the vessel is heeled five degrees from the vertical; or

[[Page 109]]

    (2) Calculating the shift of the center of gravity of the liquid in 
the tank by the moment of transference method.