WAC 296-864-50020. Follow these procedures for inflating single-piece rim wheels

(1) You must inflate tires only when contained within a restraining device or bolted on the vehicle with the lug nuts fully tightened. (2) You must make sure tires are not inflated when any flat, solid surface is in the trajectory and within one foot of the sidewall. (3) You must make sure employees stay out of the trajectory when inflating a tire. (4) You must make sure, when inflating tires, that the inflation pressure stamped in the sidewall isn't exceeded unless the manufacturer recommends a higher pressure. (5) You must make sure tires aren't inflated above the maximum pressure recommended by the manufacturer to seat the tire bead firmly against the rim flange.