so that the closing plate was turned and raised to secure the discharge port.
The injured person released the valve 17 and discharged sulfuric acid. Since it
took time for discharging, coworker B released the vent B.
While the injured person often opened and closed the valve 17 , discharge
pipe was exposed from a plastic bag and was closed due to the rotated closing
plate, at the same time sulfuric acid started discharging, sulfuric acid hit the
plate, then splashed over him. He wore the face shield and acid resistance
suits, but it spattered his face from the left cheek to chin that was not covered by
the face shield.