[Code of Federal Regulations]
[Title 46, Volume 1]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR38.20-10]

[Page 507]
 
                           TITLE 46--SHIPPING
 
         CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
 
PART 38_LIQUEFIED FLAMMABLE GASES--Table of Contents
 
                  Subpart 38.20_Venting and Ventilation
 
Sec. 38.20-10  Ventilation--T/ALL.

    (a) A power ventilation system shall be provided for compartments 
containing pumps, compressors, pipes, control spaces, etc. connected 
with the cargo handling facilities. These compartments shall be 
ventilated in such a way as to remove vapors from points near the floor 
level or bilges, or other areas where vapor concentrations may be 
expected. The compartments shall be equipped with power ventilation of 
the exhaust type having capacity sufficient to effect a complete change 
of air in not more than 3 minutes equal to the volume of the compartment 
and associated trunks.
    (b) The power ventilation units shall not produce a source of vapor 
ignition in either the compartment or the ventilation system associated 
with the compartment. Inlets to exhaust ducts shall be provided and 
located at points where concentrations of vapors may be expected. 
Ventilation from the weather deck shall be provided. Ventilation outlets 
shall terminate away from any openings to the interior part of the 
vessel a lateral distance at least equal to that specified in Sec. 
38.20-1(a). These outlets shall be so located as to minimize the 
possibility of recirculating contaminated air through the compartment.
    (c) Means shall be provided for purging the following spaces of 
cargo vapors:
    (1) The space surrounding nonpressure vessel type tanks, i.e., 
within the secondary barrier.
    (2) The space surrounding pressure-vessel type tanks whose piping 
connections are below the weather deck in accordance with Sec. 38.10-
1(h).
    (3) The space surrounding tanks whose manhole openings are below the 
weather deck in accordance with Sec. 38.05-10(f).
    (d) Power ventilation shall be provided for each auxiliary machinery 
or working space located on and accessible from the cargo handling deck. 
Such ventilation systems shall be designed to preclude the entry of 
cargo vapors into the space via the open access or the ventilation 
system itself.

[CGFR 66-33, 31 FR 15269, Dec. 6, 1966, as amended by CGFR 68-65, 33 FR 
19985, Dec. 28, 1968]