[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: 46CFR58.10-5]

[Page 258-259]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 58_MAIN AND AUXILIARY MACHINERY AND RELATED SYSTEMS--Table of Contents
 
         Subpart 58.10_Internal Combustion Engine Installations
 
Sec. 58.10-5  Gasoline engine installations.


    (a) Engine design. All installations shall be of marine type engines 
suitable for the intended service, designed and constructed in 
conformance with the requirements of this subchapter.
    (b) Carburetors. (1) Drip collectors shall be fitted under all 
carburetors, except the down-draft type, to prevent fuel leakage from 
reaching the bilges and so arranged as to permit ready removal of such 
fuel leakage. Drip collectors shall be covered with flame screens.

    Note: It is recommended that drip collectors be drained by a device 
for automatic return of all drip to engine air intakes.

    (2) All gasoline engines must be equipped with an acceptable means 
of backfire flame control. Installations of backfire flame arresters 
bearing basic Approval Nos. 162.015 or 162.041 or engine air and fuel 
induction systems bearing basic Approval Nos. 162.015 or 162.042 may be 
continued in use as long as they are serviceable and in good condition. 
New installations or replacements must meet the applicable requirements 
of this section.
    (3) The following are acceptable means of backfire flame control for 
gasoline engines:
    (i) A backfire flame arrester complying with SAE J-1928 or UL 1111 
and marked accordingly. The flame arrester must be suitably secured to 
the air intake with a flametight connection.
    (ii) An engine air and fuel induction system which provides adequate 
protection from propagation of backfire flame to the atmosphere 
equivalent to that provided by an acceptable backfire flame arrester. A 
gasoline engine utilizing an air and fuel induction system, and operated 
without an approved backfire flame arrester, must either include a reed 
valve assembly or be installed in accordance with SAE J-1928.
    (iii) An arrangement of the carburetor or engine air induction 
system that will disperse any flames caused by engine backfire. The 
flames must be dispersed to the atmosphere outside the vessel in such a 
manner that the flames will not endanger the vessel, persons, on board, 
or nearby vessels and structures. Flame dispersion may be achieved by 
attachments to the carburetor or location of the engine air induction 
system. All attachments must be of metallic construction with flametight 
connections and firmly secured to withstand vibration, shock, and engine 
backfire. Such installations do not require formal approval and labeling 
but must comply with this subpart.
    (c) Exhaust manifold. The exhaust manifold shall either be water-
jacketed and cooled by discharge from a pump which operates whenever the 
engine is running, or woodwork within nine inches shall be protected by 
\1/4\-inch asbestos board covered with not less than No. 22 USSG (U.S. 
standard gage) galvanized sheet iron or nonferrous metal. A dead air 
space of \1/4\-inch shall be left between the protecting asbestos and 
the wood, and a clearance of not less than two inches maintained between 
the manifold and the surface of such protection.
    (d) Exhaust pipe. (1) Exhaust pipe installations shall conform to 
the requirements of the American Boat and Yacht Council Standard P-1 
``Safe Installation for Exhaust Systems'' and National Fire Protection 
Association Standard NFPA 302, part 1, section 23 and the following 
additional requirements:
    (i) All exhaust installations with pressures in excess of 15 pounds 
per square inch gage or employing runs

[[Page 259]]

passing through living or working spaces shall meet the material 
requirements of part 56 of this subchapter.
    (ii) Horizontal dry exhaust pipes are permitted only if they do not 
pass through living or berthing spaces, they terminate above the deepest 
load waterline and are so arranged as to prevent entry of cold water 
from rough or boarding seas, and they are constructed of corrosion 
resisting material ``at the hull penetration.''

[CGFR 68-82, 33 FR 18878, Dec. 18, 1968, as amended by CGD 88-032, 56 FR 
35824, July 29, 1991]