In addition to oxygen, which gases should be tested in the PRCS atmosphere?

In a Permit-Required Confined Space (PRCS) atmosphere, it is essential to assess not only the levels of oxygen but also the presence of combustible gases and vapors. This is because an atmosphere with too little or too much oxygen can pose life-threatening hazards, and combustible substances can lead to explosions or fires if they reach flammable concentrations.

Testing for combustible gases and vapors is vital to ensure that workers are entering a safe environment free from potential ignition sources. When dealing with confined spaces, a thorough evaluation of all hazardous gas levels helps to mitigate risks and ensures compliance with safety regulations.

While toxic gases and radioactive gases are important to consider under specific circumstances, combustible gases are particularly critical because of their potential to create immediate and life-threatening conditions in a confined space. Hence, testing for these gases alongside oxygen is a standard safety practice in confined space operations.