A confined space entry permit is required for a 10,000-gallon water tank that workers need to enter for repairs. The oxygen level reads 19.2%. What action should be taken?
Correct Answer
B) Ventilate the space and retest before entry
OSHA requires oxygen levels between 19.5% and 23.5% for safe confined space entry. At 19.2%, the space must be ventilated and retested before entry is permitted.
Why This Is the Correct Answer
OSHA's confined space entry standards (29 CFR 1910.146) require oxygen levels to be between 19.5% and 23.5% for safe entry. At 19.2%, the oxygen level is just below the minimum threshold of 19.5%, making the space unsafe for immediate entry. The proper procedure is to ventilate the space to increase oxygen levels and then retest to ensure compliance before allowing workers to enter. This approach addresses the deficiency while maintaining safety protocols.
Why the Other Options Are Wrong
Option A: Proceed with entry using supplied-air respirators
While supplied-air respirators provide protection, OSHA standards prohibit entry into confined spaces with oxygen levels below 19.5% regardless of respiratory protection used. The atmospheric hazard must be corrected first through ventilation.
Option C: Cancel the entry - oxygen level is too low
Canceling the entry is unnecessarily extreme since the oxygen level is only slightly below the 19.5% minimum. The deficiency can be corrected through proper ventilation, making entry possible after retesting confirms safe levels.
Option D: Enter with continuous air monitoring only
Continuous air monitoring alone does not address the fundamental problem that oxygen levels are below OSHA's minimum requirement. Entry is prohibited until atmospheric conditions are corrected through ventilation.
Memory Technique
Remember '19.5 to 23.5' as the safe oxygen zone - think 'Nearly 20 to Nearly 24' for quick recall of OSHA's confined space oxygen requirements
Reference Hint
OSHA 29 CFR 1910.146 - Permit-Required Confined Spaces, specifically atmospheric testing requirements and acceptable oxygen levels
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