Mechanical Energy Hazards
The image shows safety blocks being used as an additional safeguard on a mechanical power press, even though the machine has been locked out. The safety blocks prevent the ram from coming down under its own weight.
Safety Block
Pneumatic and Hydraulic Energy Hazards
The second image shows a lockout valve. The lever-operated valve used during repair or shutdown to keep a machine or its components from operating can be locked open or shut.
Valve Lockout
Before the valve can be opened, everyone working on the machine must use his or her own key to release the lockout.
A sliding-sleeve valve exhausts line pressure at the same time it cuts off the air supply. Valves used to lock out pneumatic or hydraulic-powered machines should be designed to accept locks or lockout adapters and should be capable of "bleeding off" pressure residues that could cause any part of the machine to move.
Knowledge Check Choose the best answer for the question.
6-4. Which of the following is used as an additional safeguard to protect against a mechanical energy (gravity) hazard even though the machine has been locked out?
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