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CODE OF FEDERAL REGULATIONS – TITLE
46 – SHIPPING
PART 58—MAIN AND AUXILIARY MACHINERY
AND RELATED SYSTEMS
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 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]
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