[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: 46CFR45.145]

[Page 85]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 45_GREAT LAKES LOAD LINES--Table of Contents
 
                   Subpart D_Conditions of Assignment
 
Sec. 45.145  Hatchway covers.

    (a) Hatchways in position 1 and 2 must have weathertight hatch 
covers with gaskets and clamping devices.
    (b) The maximum ultimate strength of the hatchway cover material 
must be at least 4.25 times the maximum stress in the structure 
calculated with the following assumed loads:
    (1) For ships 350 ft or more in length, at least 250 lb/ft\2\ in 
position 1 and 200 lb/ft\2\ in position 2.
    (2) For ships less than 350 ft in length, at least AL in the 
following formula:
    (i) Position 1:

AL=200+C
where C=50(L-79)/271
    (ii) Position 2:

Al=150+C

    (c) Hatchway covers must be so designed as to limit the deflection 
to not more than 0.0028 times the span under the loads described in 
paragraph (b) of this section and the thickness of mild steel plating 
forming the tops of covers must be at least 1 percent of the spacing of 
stiffeners or 0.24 in, whichever is greater.