Philippines Occupational Safety and Health Standards R1120: Rule 1120 Hazardous work processes: before entering an underground tank or similar confined space, water level checked, air tested for explosive gases, oxygen and carbon monoxide, blower ventilation where levels are abnormal, breathing apparatus available, a watcher in regular contact with equivalent apparatus, no smoking or open flames until fire risk is cleared, no solvent spraying without protection, openings barricaded and lit, and adequate means of entry and exit

What does R1120 require?

Before any worker enters a confined or enclosed space and before work starts, the area is checked visually so that any water is below 15 cm with a dry wooden platform available if present, the air is tested for explosive gases, fumes and vapours, oxygen content and carbon monoxide where burning has occurred, and entry waits until blower ventilation has corrected any abnormal reading. Approved breathing apparatus and other PPE are provided for those entering, nobody enters unless a watcher familiar with the job stays in contact at regular intervals with breathing apparatus ready for an emergency, no smoking, open lights, torches, arcs or flames are allowed until inspection confirms there is no fire or explosion possibility, no spraying or painting with volatile solvents is done without respiratory and other protection, unattended manholes and tank openings are barricaded by day and barricaded and lit with warning signs at night, and adequate means of entry and exit are provided.