OSHA lists their basic consideration of hazardous atmospheres under the definition section of the PRCS standard along with the requirements to maintain an acceptable atmosphere. Atmospheric testing must be done before the employee enters the space and periodically during the entry. The entrant must vacate the space immediately if a hazardous atmosphere is detected.
Written verification of the safe entry conditions and that pre-entry procedures have been conducted are required. This verification is done through a written certification that contains the date, location of the space and the signature of the person providing the certification. The certification and monitoring testing and results must be made available to the employee.
- 100 people die each year because of improper ventilation in permit spaces, 6000 are injured.
- Ensure that ventilators are used and maintained according to the manufacturer's directions.
- Always use the manufacturer's purge charts for initial ventilation time and retest conditions before entry.