[Code of Federal Regulations]
[Title 46, Volume 7]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR182.425]

[Page 272-273]
 
                           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. 182.425  Engine exhaust cooling.

    (a) Except as otherwise provided in this paragraph, all engine 
exhaust pipes must be water cooled.
    (1) Vertical dry exhaust pipes are permissible if installed in 
compliance with Sec. Sec. 177.405(b) and 177.970 of this chapter.
    (2) Horizontal dry exhaust pipes are permitted only if:
    (i) They do not pass through living or berthing spaces;
    (ii) They terminate above the deepest load waterline;
    (iii) They are so arranged as to prevent entry of cold water from 
rough or boarding seas;
    (iv) They are constructed of corrosion resisting material at the 
hull penetration; and
    (v) They are installed in compliance with Sec. Sec. 177.405(b) and 
177.970 of this chapter.

[[Page 273]]

    (b) The exhaust pipe cooling water system must comply with the 
requirements of this paragraph.
    (1) Water for cooling the exhaust pipe must be obtained from the 
engine cooling water system or a separate engine driven pump.
    (2) Water for cooling the exhaust pipe, other than a vertical 
exhaust, must be injected into the exhaust system as near to the engine 
manifold as practicable. The water must pass through the entire length 
of the exhaust pipe.
    (3) The part of the exhaust system between the point of cooling 
water injection and the engine manifold must be water-jacketed or 
effectively insulated and protected in compliance with Sec. Sec. 
177.405(b) and 177.970 of this chapter.
    (4) Vertical exhaust pipes must be water-jacketed or suitably 
insulated as required by Sec. 182.430(g).
    (5) When the exhaust cooling water system is separate from the 
engine cooling water system, a suitable warning device, visual or 
audible, must be installed at the operating station to indicate any 
reduction in normal water flow in the exhaust cooling system.
    (6) A suitable hull strainer must be installed in the circulating 
raw water intake line for the exhaust cooling system.
    (c) Engine exhaust cooling system built in accordance with the 
requirements of ABYC Project P-1, ``Installation of Exhaust Systems for 
Propulsion and Auxiliary Machinery,'' 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]