Potential energy is energy stored in an object or system, such as a raised load, compressed spring or pressurized line, that can be released suddenly and injure workers.
Potential energy is energy stored in an object or system because of its position, condition or contents. In safety, it is usually called stored or residual energy. Gravitational potential energy is calculated as PE = mgh, where m is mass, g is gravitational acceleration and h is height, so heavier objects and greater heights store more energy. Other forms include energy stored in compressed springs, coiled cables, hydraulic and pneumatic pressure, capacitors, tensioned belts and chemical reactions.
When released unexpectedly, potential energy turns into kinetic energy, which can strike, crush or cut workers. That's why lockout/tagout procedures require stored energy to be relieved, disconnected or restrained, not just switched off.
A mechanic shuts off a dump truck to work under the raised bed. Even with the engine off, the bed stores enough gravitational energy to crush him if the hydraulics leak down. He installs the manufacturer's body prop before reaching under it.
Potential energy is stored and waiting to be released. Kinetic energy is the energy of motion. Injuries happen when stored energy is released and becomes motion.
No. Equipment can hold pressure, tension or raised loads after power is off. Stored energy must be released or restrained and then verified.
Rated jack stands, cribbing, body props, pins and safety blocks hold raised parts in place so they can't fall.
Part of SafetyIQ's EHS glossary: plain-English definitions of workplace health and safety terms.
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