Have you ever wondered what a “No. 54 drill-size Opening” is? This is a phrase used in OSHA’s 1910.111, Storage and handling of anhydrous ammonia. In simple terms, OSHA has established that if the potential leak is through an opening of No. 54 drill-size or smaller then, the opening need not be protected by an excess-flow valve. ...
OSHA and “No. 54 drill-size openings” (Anhydrous Ammonia)
