[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR182.430]

[Page 272]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 182--MACHINERY INSTALLATION--Table of Contents
 
               Subpart D--Specific Machinery Requirements
 
Sec. 182.430  Engine exhaust pipe installation.

    (a) The design of all exhaust systems must ensure minimum risk of 
injury to personnel. Protection must be provided in compliance with 
Sec. 177.970 of this chapter at such locations where persons or 
equipment might come in contact with an exhaust pipe.
    (b) Exhaust gas must not leak from the piping or any connections. 
The piping must be properly supported by noncombustible hangers or 
blocks.
    (c) The exhaust piping must be so arranged as to prevent backflow of 
water from reaching engine exhaust ports under normal conditions.
    (d) Pipes used for wet exhaust lines must be Schedule 80 or 
corrosion-resistant material and adequately protected from mechanical 
damage.
    (e) Where flexibility is necessary, a section of flexible metallic 
hose may be used. Nonmetallic hose may be used for wet exhaust systems 
provided it is especially adapted to resist the action of oil, acid, and 
heat, has a wall thickness sufficient to prevent collapsing or panting, 
and is double clamped where practicable.
    (f) Where an exhaust pipe passes through a watertight bulkhead, the 
watertight integrity of the bulkhead must be maintained. Noncombustible 
packing must be used in bulkhead penetration glands for dry exhaust 
systems. A wet exhaust pipe may be welded to a steel or equivalent 
bulkhead in way of a penetration and a fiberglass wet exhaust pipe may 
be fiberglassed to a fiberglass reinforced plastic bulkhead if suitable 
arrangements are provided to relieve the stresses resulting from the 
expansion of the exhaust piping.
    (g) A dry exhaust pipe must:
    (1) If it passes through a combustible bulkhead or partition, be 
kept clear of, and suitably insulated or shielded from, combustible 
material.
    (2) Be provided with noncombustible hangers and blocks for support.
    (h) An exhaust pipe discharge terminating in a transom must be 
located as far outboard as practicable so that exhaust gases cannot 
reenter the vessel.
    (i) Arrangements must be made to provide access to allow complete 
inspection of the exhaust piping throughout its length.
    (j) An exhaust installation subject to pressures in excess of 105 
kPa (15 psig) gauge or having exhaust pipes passing through living or 
working spaces must meet the material requirements of part 56 of 
subchapter F (Marine Engineering) of this chapter.
    (k) Engine exhaust installations built in accordance with the 
requirements of ABYC Project P-1, will be considered as meeting the 
requirements of this section.

[CGD 85-080, 61 FR 986, Jan. 10, 1996; 61 FR 20557, May 7, 1996; 61 FR 
24464, May 15, 1996, as amended at 62 FR 51358, Sept. 30, 1997]