[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: 33CFR157.11]

[Page 464-465]
 
                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. 157.11  Pumping, piping and discharge arrangements.

    (a) Each tank vessel must have a fixed piping system for 
transferring oily mixtures from cargo tanks to slop tanks and for 
discharging oily mixtures to the sea and to reception facilities. On a 
vessel that has two or more independent piping arrangements, the 
arrangements collectively form the fixed piping system required by this 
paragraph.
    (b) Each fixed piping system required by paragraph (a) of this 
section must have:
    (1) At least two manifolds on the weather deck for transferring oily 
mixtures to reception facilities, one of which is on the port side of 
the vessel and one of which is on the starboard side; and
    (2) Except as provided in paragraph (c) of this section, at least 
one discharge point that:
    (i) Is used for discharges to the sea;

[[Page 465]]

    (ii) Is on a port or starboard weather deck or on the vessel's side 
above the waterline of its deepest ballast condition; and
    (iii) Has an automatic stop valve that is actuated by a cargo 
monitor signal, except that manual valves may be provided on new vessels 
of less than 4,000 tons deadweight and on existing vessels.
    (c) An above waterline discharge point is not required on an 
existing vessel if its fixed piping system meets Paragraphs 3 and 4 of 
Appendix E of this part.
    (d) Each tank vessel under Sec. 157.09, Sec. 157.10a, or Sec. 
157.10b that carries crude oil must have:
    (1) Equipment that drains each cargo pump and oil piping line of oil 
residue;
    (2) Oil piping lines for the draining of oil residue from cargo 
pumps and other oil piping lines to a cargo tank or a slop tank; and
    (3) An oil piping line that meets paragraph (f) of this section and 
is connected to the cargo discharge piping on the outboard side of the 
manifold valves for the draining of oil residue from cargo pumps and 
other oil piping lines to a receptacle on the shore.
    (e) Each tank vessel under Sec. 157.10 must have:
    (1) Oil piping lines that are designed and installed to minimize oil 
retention in those lines;
    (2) Equipment that drains each cargo pump and oil piping line of oil 
residue;
    (3) Oil piping lines for the draining of oil residue from cargo 
pumps and other oil piping lines to a cargo tank or slop tank; and
    (4) An oil piping line that meets paragraph (f) of this section and 
is connected to the cargo discharge piping on the outboard side of the 
manifold valves for the draining of oil residue from cargo pumps and 
other oil piping lines to a receptacle on the shore.
    (f) Each oil piping line under paragraph (d)(3) or (e)(4) of this 
section must have a cross-sectional area of 10 percent or less of the 
cross-sectional area of the main cargo discharge piping line, except if 
the oil piping line under paragraph (d)(3) of this section is installed 
before January 1, 1980, that piping line may have a cross-sectional area 
of 25 percent or less of the cross-sectional area of the main cargo 
discharge piping line.
    (g) Each tank vessel to which Sec. 157.10d applies that is built 
under a contract awarded after September 11, 1992 must be arranged so 
that:
    (1) Except for short lengths of completely welded (or equivalent) 
piping,
    (i) Ballast piping and other piping to ballast tanks, such as 
sounding and vent piping, do not pass through cargo tanks, and
    (ii) Cargo piping and other piping to cargo tanks do not pass 
through ballast tanks;
    (2) Suction wells in cargo tanks that protrude into the double 
bottom are as small as practicable and extend no closer to the bottom 
shell plating than 0.5h, as specified in Sec. 157.10d(c)(2) or Sec. 
157.10d(d)(2), as applicable; and
    (3) On a vessel that is constructed and certificated for service 
exclusively on inland, Great Lakes, or limited short protected coastwise 
routes, any oil piping that is located within double hull spaces must be 
placed as far from the outer shell as is practicable and must be fitted 
with valves at the point of connection to the tank served, to prevent 
oil outflow in the event of damage to the piping. Such valves must be 
closed whenever the vessel is underway with any oil in tanks served by 
the associated piping, except as necessary during transfer operations.
    Note: Piping location requirements for an oceangoing vessel are in 
Sec. 157.19(d). Related operating requirements are in Sec. 157.45.

[CGD 74-32, 40 FR 48283, Oct. 14, 1975, as amended by CGD 80-78, 45 FR 
43704, June 30, 1980; CGD 77-058b, 45 FR 43708, June 30, 1980; CGD 79-
152, 45 FR 82250, Dec. 15, 1980; CGD 76-088b, 48 FR 45720, Oct. 6, 1983; 
CGD 90-051, 57 FR 36244, Aug. 12, 1992; USCG-2000-7641, 66 FR 55573, 
Nov. 2, 2001]