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Energy and isolation-Lock out tag out

Energy and isolation-Lock out tag out

Oct 22, 2020

Energy and isolation

Hazardous energy: Energy contained in process materials or equipment that may cause injury to persons or property. The energy in the enterprise mainly has: electric energy; Mechanical energy (mobile devices; Rotating equipment; Motion energy: shearing, rolling, rolling, potential mechanical energy); Thermal energy (mechanical or equipment, chemical reaction), potential energy (pressure: air pressure; Spring force. Gravity), chemical energy (toxicity, corrosion, etc.), radiation energy and other potential or stored energy.

Energy isolation refers to the effective control, isolation and protection of potential energy that may be out of control and cause personal injury, environmental damage, equipment damage and property loss, so as to prevent the accidental release of dangerous energy or materials, thus causing damage to personnel, environment or equipment.

In enterprise safety accidents, accidents caused by energy isolation account for a large proportion of all kinds of accidents and events. According to data from OSHA (Occupational Safety and Health Administration of the US Department of Labor), in all industrial accidents, about 250,000 accidents are related to hazardous energy each year, among which 50,000 are injurious and more than 100 are fatal, accounting for as high as 90% of the total industrial accidents. If the hazardous energy is effectively controlled, the casualty rate can be reduced by 25% to 50%.


Energy isolation procedures generally include:

I. Determine the isolation point based on the work content.

Ii. Verify that the system within the isolation area is in a "zero energy" state

Iii. Use isolation and locking devices to lock the isolation point

Iv. Unlocking and debugging after inspection and maintenance

V. Isolation and removal of locked devices after completion of work


Effective isolation and control of dangerous energy is not only to ensure the safety of personnel and equipment, ensure the safety of the operation process, but also one of the important means to improve the level of enterprise safety management.