[Code of Federal Regulations]
[Title 33, Volume 2]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 33CFR157.19]

[Page 466-467]
 
                TITLE 33--NAVIGATION AND NAVIGABLE WATERS
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 157--RULES FOR THE PROTECTION OF THE MARINE ENVIRONMENT RELATING TO 
TANK VESSELS CARRYING OIL IN BULK--Table of Contents
 
             Subpart B--Design, Equipment, and Installation
 
Sec. 157.19  Cargo tank arrangement and size.

    (a) This section applies to:
    (1) A U.S. or foreign vessel that is delivered after January 1, 
1977;
    (2) A U.S. vessel that is delivered before January 1, 1977, for 
which the building contract is awarded after January 1, 1972, or, if 
there is no building contract, the keel is laid or the vessel is at a 
similar stage of construction after June 30, 1972; and
    (3) A foreign vessel that is delivered before January 1, 1977, for 
which the building contract is awarded after January 1, 1974, or, if 
there is no building contract, the keel is laid or the vessel is at a 
similar stage of construction after June 30, 1974.
    (b) As determined in accordance with the procedures contained in 
Appendix

[[Page 467]]

A of this part, each cargo tank must be of such size and arrangement 
that:
    (1) The hypothetical outflow for side damage (Oc) or for 
bottom damage (Os) anywhere within the length of the vessel 
must not exceed OA (30,000 cubic meters or (400)x(3[radic] 
DWT) whichever is greater, limited to a maximum of 40,000 cubic meters);
    (2) The volume of each wing tank and center tank is less than the 
allowable volume of a wing tank (VOLW) and the allowable 
volume of a center tank (VOLC) respectively; and
    (3) The length of a tank is less than the allowable length of a tank 
(la).
    (c) If a cargo transfer system interconnects two or more cargo 
tanks, the system must have valves to segregate the tanks from each 
other.
    (d) If a line of piping that runs through a cargo tank in a position 
less than tc from the vessel's side or less than 
vs from the vessel's bottom as defined in Appendix A of this 
part, has a branch, that branch must have a stop valve:
    (1) Within each cargo tank into which the branch opens; or
    (2) Outside each tank into which the branch opens in a location that 
is immediately adjacent to the point at which the branch enters the 
tank.
    (e) If piping that serves suction wells is installed within a double 
bottom, that piping must be:
    (1) Fitted with valves located at the point of connection to the 
tank served to prevent oil outflow in the event of damage to the piping; 
and
    (2) Designed to be installed as high from the bottom shell as 
possible.

[CGD 74-32, 40 FR 48283, Oct. 14, 1975, as amended by CGD 75-240, 41 FR 
54180, Dec. 13, 1976; CGD 76-088b, 48 FR 45720, Oct. 6, 1983; USCG-2000-
7223, 65 FR 40058, June 29, 2000]