1910.147 LOTO vs. 1910.146 Isolation
Question: If I close and Lockout/Tagout the main valve on the natural gas line supplying a boiler unit – does this satisfy OSHA’s requirement for eliminating the hazard of a permit required confined space?
Answer: No, it does not. You are asking a question that we address quite often and it reveals some misconceptions regarding “eliminating” or “isolating” the permit space from hazards. Lockout/Tagout (LOTO) procedures are covered in OSHA’s 1910.147 “Control of Hazardous Energy (Lockout/Tagout).
” Many times this regulation is incorrectly referenced when addressing permit space hazards that are not covered by this regulation.
OSHA’s 1910.147 LOTO regulation applies to the control of electrical, mechanical, hydraulic, pneumatic, chemical, thermal, or other energy. It does not apply to engulfment hazards (liquid or flowable solids), flammable gasses, or other gasses that may be toxic or oxygen displacing.
By closing and placing a LOTO device on a single valve of a natural gas feed line, you may have controlled the hazard but you have not eliminated it. To provide true isolation (elimination), you will have to employ such means as: blanking or blinding; misaligning or removing sections of lines, pipes, or ducts; or a double block and bleed system.
Download the LOTO tip sheet from NIOSH.