CFR > Title 46 - Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER H—PASSENGER VESSELS (parts 70 to 81) > PART 76—FIRE PROTECTION EQUIPMENT > SUBPART 76.33—Smoke Detecting System, Details (§76.33-1 to §76.33-90) > 76.33-15—Piping.

76.33-15—Piping.

(a) Individual pipes shall be not less than 3/4 -inch standard pipe size.
(b) All piping, valves, and fittings of ferrous materials shall be protected inside and outside against corrosion unless specifically approved otherwise by the Commandant.
(c) Where a smoke detecting system serves a space used alternately for liquid and dry cargo, a valve shall be installed between the tank and the detecting cabinet so that the line may be shut off when liquids are carried. When the smoke detecting system is combined with a fire extinguishing system, the operation of the valve shall not affect the operation of the fire extinguishing system.
(d) All piping, valves, and fittings shall be securely supported, and where necessary, protected against injury. The piping shall be installed with as easy bends as practicable, and shall be installed to grade to low points for drainage.
(e) Drains and dirt tapes shall be fitted where necessary to prevent the accumulation of dirt or moisutre.