California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 15 - Petroleum Safety Orders-Refining, Transportation and Handling
Article 8 - Access and Egress
Section 6799 - Egress Requirements for Equipment Structures

(a) The exit doors of rooms housing equipment containing corrosives, flammable liquids, gases or vapors being processed or tested shall swing outward except when they would swing into corridors of less than five feet (1.52 m) in width. When located between two such rooms, the exit doors shall swing both ways. Exit doors shall not be locked in such a manner as to prevent a ready exit while the rooms are occupied.

(b) Two means of egress shall be provided from any elevated platform 10 feet (3.05 m) or more above the floor or ground level, on fired processing equipment, or which serves or is connected to three or more vessels, and from which employees must perform operating duties, and when the lack of the second means would prevent the egress of an employee in case of fire or other emergency. The means of egress may be by fixed ladder, stairway, ramp, walkway, or slide and shall be so located relative to each other as to provide reasonably safe alternative means of egress.

(c) Fences, closely or immediately surrounding flammable liquid or gas process equipment, which may hamper or prevent the egress of employees in an emergency, shall have gates opening outward. Such gates shall be unlocked when the area within the enclosure is occupied, or other facilities affording equally quick exit shall be provided.