19.A.08 Work Inside Confined and Enclosed Spaces in Ships and Vessels.
> See Section 34.B.
19.A.09 When there is a potential for marine activities to interfere with or damage utilities or other structures, including those underwater, a survey must be conducted to identify the utilities or structures in the work area, analyze the potential for interference or damage, and recommend steps to be taken to prevent the interference or damage.
19.A.10 Ventilation.
- Motor vessels or boats powered by internal combustion engines having electric spark ignition systems or having auxiliary engines of this type in cabins, compartments, or confined spaces must be equipped with an exhaust fan(s) for ventilating engine space and bilges.
- At least two ventilators fitted with fans capable of ventilating each machinery space and fuel tank compartment, including bilges, must be provided to remove any flammable or explosive gases, except those vessels constructed with the greater portions of the bilges open or exposed to the natural atmosphere at all times.
- Other compartment spaces within a vessel, not covered in this Section, may be naturally vented.
Note: this requirement does not apply to diesel engines.
- Living spaces, including the galley, must be adequately ventilated in a manner suitable to the purpose of the space.
- For launches and motorboats having diesel power plants not equipped with fans, ventilating must be by natural draft through permanently open inlet and outlet ducts extending into the bilges. Inlet and exhaust ducts must be equipped with cowls or exhaust heads.
- For launches, motorboats (survey boats), and skiffs having deck-mounted internal combustion engines (such as generators, jigger pumps) and not equipped with fans, exhaust piping must be located away from personnel spaces to minimize CO infiltration in the work space.
- Vent and ventilator requirements.
- (1) Fans must be rated for Class I hazardous locations and located as remotely from potential explosive areas as practical. > See Section 11.H.
- (2) The vent intake must extend to within 1 ft (0.3 m) of the bottom of the compartment.
- (3) Means must be provided for stopping fans in ventilation systems serving machinery components and for closing doorways, ventilators, chases, and annular spaces around tunnels and other openings from outside these spaces in case of fire.
- Engines must not be started until the engine space and bilges have been ventilated to remove fuel vapor.
19.A.11 The most current, pertinent information published by the USCG regarding aids to navigation must be maintained aboard self-propelled vessels 26 ft (7.9 m) or more in length.
Knowledge Check Choose the best answer for the question.
19-5. What is the requirement for ventilating bilges to remove flammable or explosive gases when the greater portions of the bilges are NOT open or exposed to the natural atmosphere at all times?
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