CFR > Title 46 - Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER I-A—MOBILE OFFSHORE DRILLING UNITS (parts 107 to 109) > PART 108—DESIGN AND EQUIPMENT > SUBPART B—Construction and Arrangement (§108.113 to §108.241) > 108.175—Contiguous locations.

108.175—Contiguous locations.

An enclosed space that has direct access to a Division 1 or Division 2 location is the same division as that location, except—
(a) An enclosed space that has direct access to a Division 1 location is not a hazardous location if—
(1) The access has self-closing gas-tight doors that form an air lock;
(2) The ventilation causes greater pressure in the space than in the Division 1 location; and
(3) Loss of ventilation overpressure activates an alarm at a manned station;
(b) An enclosed space that has direct access to a Division 1 location can be considered as a Division 2 location if—
(1) The access has a self-closing, gas-tight door that opens into the space and that has no hold-back device;
(2) Ventilation causes the air to flow with the door open from the space into the Division 1 location; and
(3) Loss of ventilation activates an alarm at a manned control station; and
(c) An enclosed space that has direct access to a Division 2 location is not a hazardous location if—
(1) The access has a self-closing, gas-tight door that opens into the space and that has no hold-back device;
(2) Ventilation causes the air to flow with the door open from the space into the Division 2 location; and
(3) Loss of ventilation activates an alarm at a manned control station.