WAC 296-24-73507. Covers and guardrails

(1) You must ensure that all open vats and tanks into which workers may fall are guarded with railings or screen guards. (2) You must ensure that all open vats and tanks where workers are employed have a platform or walkway 36 to 42 inches below the top of vat or tank or where walkway is flush with top of vat or tank, a standard safeguard of 36 to 42 inches high must be constructed. (3) You must ensure that every tank over 5 feet deep, excepting where agitators are used or where products may be damaged by ladders, has a ladder fixed on the inside so placed as to connect with means of access from the outside. Rungs must have a clearance of at least 6 inches measured between the rung and the side of the tank.