Specifications

SMALL VESSEL COMPLIANCE PROGRAM (SVCP) TP 15111E

Detailed Compliance Report and Guidelines Page 12 of 20

SECTION 11: VENTILATION

QUESTION 50

On a vessel, an enclosed space that contains a source of gasoline vapour shall have, in accordance with the construction standards, a

natural ventilation system designed to remove any accumulation of combustible vapours.

Sources of gasoline vapour include:

(a) a permanently installed gasoline engine;

(b) a portable gasoline fuel tank that ventilates into the space; or

(i) with an aggregate permeability rate exceeding 42 grams of fuel loss in 24 hours per cubic centimetre (1.2 grams per cubic

foot) of net compartment volume; or

(ii) with a net compartment volume of less than 0.028 cubic metres (1 cubic foot), having a permeability rate exceeding 1.2

grams of fuel loss in 24 hours.

EXAMPLE OF VENTILATION OF ENCLOSED SPACES

If the source of gasoline vapour is in an open space, then the requirement to have a natural ventilation system does not apply. An open

space has the following characteristics:

(a) at least 0.34 m

(3.5 ft

) of area exposed to the atmosphere per cubic metre (35 ft

) of net space volume; and

(b) no long or narrow unvented spaces in which a flame front might propagate.

For additional details, see TP 1332 section 6.

QUESTION 51

Blowers for powered ventilation may be installed separately or installed in the natural ventilation system.

Blowers shall be mounted as high as practicable above the bilge low point to prevent contact with bilge fluid.

Blower outlet fittings shall not have less effective area than blower intakes.

Blowers shall not be wired in the ignition circuit to run continuously, unless rated by the blower manufacturer for continuous

operation.

Blower motors shall be of a sealed type or ignition protected and shall be suitable for installation in damp locations.

Blowers shall be designed for a minimum of four minutes continuous operation, more if required, to clear any space of

combustible vapours.

QUESTION 52

Neither mechanical nor natural ventilation is required to remove diesel fuel vapours.

Ventilating provisions and openings to the engine space shall provide for the supply of combustion air and shall accommodate the air

requirements of each propulsion and auxiliary engine in that space. Refer to the manufacturer‘s documentation to determine the air

requirements of each engine in a space. The openings for providing the air requirements of propulsion and auxiliary engine may also

function as means of providing natural ventilation to the space.