Coast Guard, DHS § 169.625

§ 169.619 Reliability. or direct mechanical linkage is the primary means of controlling the rudder. (a) Except where the OCMI judges it impracticable, the steering system § 169.623 Power-driven steering sys- must— tems. (1) Provide continued or restored (a) Power-driven steering systems steering capability in the event of a must have means to be brought into failure or malfunction of any single operation from a dead ship condition, steering system component other than without external aid. The system must the rudder or rudder stock; automatically resume operation after (2) Be independent of other systems, an electric power outage. including auxiliary propulsion machin- (b) Control of power-driven steering ery; and systems from the main steering control (3) Be operable in the event of local- location must include, as applicable— ized fire or flooding. (1) Control of any necessary ancillary (b) A main and independent auxiliary device (motor, pump, valve, etc.); steering gear must be provided, except (2) A pilot light to indicate operation when— of each power unit; and (1) A small vessel uses a tiller or di- (3) Visual and audible alarms to indi- rect mechanical linkage as the primary cate loss of power to the control sys- means of controlling the rudder; or tem or power units and overload of (2) Installation of an auxiliary steer- electric motors. ing gear is not possible. (c) Overcurrent protection for steer- NOTE: A partial reduction of normal steering system electric circuits must meet ing capability as a result of malfunction or § 111.93–11 of this chapter, as applicable. failure is acceptable. This reduction should not be below that necessary for the safe VENTILATION navigation of the vessel. § 169.625 Compartments containing (c) The strength and reliability of diesel machinery. any component that is not provided in duplicate must be suitable to the cog- (a) Spaces containing machinery nizant OCMI. Where redundant or must be fitted with adequate dripproof backup equipment or components are ventilators, trunks, louvers, etc., to provided to meet the requirements of provide sufficient air for proper oper- paragraphs (a) and (b) of this section, ation of the propulsion and auxiliary the following must be provided: engines. (b) Air-cooled propulsion and auxil- (1) A means to readily transfer from iary engines installed below deck must the failed equipment or component to be fitted with air intake ducts or pip- the backup. ing from the weather deck. The ducts (2) Readily available tools or equip- or piping must be arranged and sup- ment necessary to make the transfer. ported to safely sustain stresses in- (3) Instructions for transfer proce- duced by weight and engine vibration dures, posted at the main steering loca- and to minimize transfer of vibration tion. to the supporting structure. Prior to (4) A means to steady the rudder installing ventilation for the engines, while making the transfer. plans or sketches showing the machinery arrangement including air intakes, § 169.621 Communications. exhaust stack, method of attachment A reliable means of voice commu- of ventilation ducts to the engine, loca- nications must be provided between the tion of spark arresting mufflers and ca- main steering location and each alter- pacity of ventilation blowers must be nate steering location. submitted to the OCMI for approval. (c) Spaces containing machinery § 169.622 Rudder angle indicators. must be fitted with at least two ducts Each vessel must have a rudder angle to furnish natural or mechanical sup- indicator at the main steering location ply and exhaust ventilation. One duct that meets the requirements of § 113.40– must extend to a point near the bottom 10 of this chapter, except where a tiller of the compartment, and be installed

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so that the ordinary collection of water § 169.631 Separation of machinery and in the bilge will not trap the duct. fuel tank spaces from accommoda- Where forced ventilation is installed, tion spaces. the duct extending to the bottom of (a) Machinery and fuel tank spaces the compartment must be the exhaust. must be separated from accommoda- The total inlet area and the total out- tion spaces by watertight or vapor let area of ventilation ducts must be tight bulkheads of double diagonal not less than one square inch for each wood, marine plywood, steel plate, or foot of beam of the vessel. These min- equivalent construction. imum areas must be increased when (b) On vessels less than 90 feet in such ducts are considered part of the length, segregation may be by means of air supply to the engines. a watertight or vapor tight engine box. (d) All ducts must be of rigid perma- PIPING SYSTEMS nent noncombustible construction, properly fastened, supported, and rea- § 169.640 General. sonably gastight from end to end. (a) Vital piping systems, as defined in (e) All supply ducts for ventilation § 169.642 of this subpart, must meet the purposes must be provided with cowls material and pressure design require- or scoops having a free area not less ments of Subchapter F of this chapter. than twice the required duct area. (b) Except as provided in this para- When the cowls or scoops are screened, graph, nonmetallic piping system ma- the mouth area must be increased to terials must meet the applicable re- compensate for the area of the screen quirements of 46 CFR 56.60–25. wire. Dampers are prohibited in supply (1) Rigid nonmetallic materials are ducts. Cowls or scoops must be kept acceptable for use in bilge, ballast, and open at all times except when weather machinery-connected piping systems would endanger the vessel if the open- on vessels less than 120 feet in length, ings were not temporarily closed. Sup- provided that bilge and fire systems do ply and exhaust openings must not be not use the same piping. located where the natural flow of air is (2) Nonmetallic piping is prohibited unduly obstructed, or adjacent to pos- in fuel systems except where flexible sible sources of vapor ignition, and hose is permitted. (3) Rigid nonmetallic materials may must not be located where exhaust air be used in non-vital systems. may be taken into the supply vents. § 169.642 Vital systems. § 169.627 Compartments containing diesel fuel tanks. For the purpose of this part, the following are considered vital systems— Unless they are adequately venti- (a) A marine engineering system lated, enclosed compartments or spaces identified by the OCMI as being crucial containing diesel fuel tanks and no ma- to the survival of the vessel or to the chinery must be provided with a goose- protection of the personnel on board; neck vent of not less than 21⁄2 inches in and diameter. The vent opening must not (b) On vessels greater than 120 feet in be located adjacent to possible sources length— of vapor ignition. (1) Bilge system; (2) Ballast system; § 169.629 Compartments containing (3) Fire protection system; gasoline machinery or fuel tanks. (4) Fuel oil system; and Spaces containing gasoline machin- (5) Steering and steering control sys- ery or fuel tanks must have natural tem. supply and mechanical exhaust ven- BILGE SYSTEMS tilation meeting the requirements of American Boat and Yacht Council § 169.650 General. Standard H–2.5, ‘‘Design and Construc- All vessels must be provided with a tion; Ventilation of Boats Using Gaso- satisfactory arrangement for draining line. any compartment, other than small

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