[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: 46CFR173.020]

[Page 158-159]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 173_SPECIAL RULES PERTAINING TO VESSEL USE--Table of Contents
 
                            Subpart B_Lifting
 
Sec. 173.020  Intact stability standards: Counterballasted and 
non-counterballasted vessels.

    (a) Except as provided in paragraph (c) of this section, each vessel 
that is not equipped to counter-ballast while

[[Page 159]]

lifting must be shown by design calculations to comply with this section 
in each condition of loading and operation and at each combination of 
hook load and crane radius.
    (b) Each vessel must have a righting arm curve with the following 
characteristics:
    (1) If the vessel operates in protected or partially protected 
waters, the area under the righting arm curve up to the smallest of the 
following angles must be at least 10 foot-degrees (3.05 meter-degrees):
    (i) The angle corresponding to the maximum righting arm.
    (ii) The downflooding angle.
    (iii) 40 degrees.
    (2) If the vessel operates in exposed waters, the area under the 
righting arm curve up to the smallest of the following angles must be at 
least 15 foot-degrees (4.57 meter-degrees):
    (i) The angle corresponding to the maximum righting arm.
    (ii) The downflooding angle.
    (iii) 40 degrees.
    (c) If the vessel's hull proportions fall within all three of the 
following limits, in lieu of complying with paragraph (b) of this 
section, the vessel owner may demonstrate in the presence of the OCMI 
that the vessel will not heel beyond the limits specified in paragraph 
(d) of this section:
    (1) Beam to depth--3.40 to 4.75.
    (2) Length to beam--3.20 to 4.50.
    (3) Draft to depth--0.60 to 0.85.
    (d) For the purpose of paragraph (c) of this section, the following 
limits of heel apply with the vessel at its deepest operating draft:
    (1) Protected and partially protected waters and Great Lakes in 
summer--heel to main deck immersion or bilge emergence, whichever occurs 
first.
    (2) Exposed waters and Great Lakes in winter--heel permitted to one-
half of the freeboard or one-half of the draft, whichever occurs first.

[CGD 79-023, 48 FR 51045, Nov. 4, 1983, as amended by CGD 85-080, 61 FR 
945, Jan. 10, 1996]