Lockout Tagout Devices Technical Specifications
Types of Lockout Tagout Devices
Lockout Tagout devices are categorized by the energy source they control and the specific equipment they secure. Understanding these classifications is fundamental for implementing an effective hazardous energy control program.
Electrical Lockout Devices
Designed to secure electrical circuits and equipment, preventing accidental power energization. This includes circuit breaker lockouts, which are available in universal, miniature, and large formats to fit various breaker designs. Electrical plug lockouts encapsulate power plugs, making them impossible to insert into outlets. Switch lockouts secure toggle or push-button switches in the off position. Panel lockouts restrict access to electrical control panels.
Valve Lockout Devices
Used to isolate various types of valves, preventing the flow of hazardous liquids, gases, or steam. Ball valve lockouts typically encompass the valve handle, preventing rotation. Gate valve lockouts secure the handwheel, while butterfly valve lockouts are designed for specific valve types. Cylinder and tank lockouts prevent the opening of pressurized containers.
Cable Lockouts
Highly versatile devices featuring an adjustable cable that can be threaded through multiple points, making them suitable for securing complex machinery, large valves, or electrical disconnects with multiple isolation points. The cable length and material can vary to suit different applications and environmental challenges.
Hasps
Safety hasps allow multiple workers to apply their individual padlocks to a single energy isolation point. Available in steel for high strength or dielectric materials for electrical safety applications, hasps ensure that power cannot be restored until all workers have removed their padlocks.
Lockout Stations and Kits
These provide organized storage and easy access to an assortment of LOTO devices, often including padlocks, hasps, tags, and specific lockout devices. Lockout kits are portable, while lockout stations are wall-mounted, ensuring that the necessary equipment is readily available for rapid deployment.
Materials and Durability
The selection of LOTO device materials is crucial for performance and longevity. Thermoplastic materials like Xenoy or polypropylene are commonly used for their non-conductivity, chemical resistance, and wide temperature range suitability, making them ideal for electrical and corrosive environments. Steel components offer superior strength and impact resistance, often used in hasps or for parts requiring robust mechanical protection. UV-stabilized materials are essential for devices exposed to outdoor elements, preventing degradation and fading over time. Devices must withstand industrial environments, including temperature extremes, oil, grease, and common industrial chemicals.
Compliance and Safety Standards
Effective Lockout Tagout programs are strictly regulated to protect workers. The primary standard in the United States is OSHA 29 CFR 1910.147, "The Control of Hazardous Energy (Lockout/Tagout)." This standard mandates specific procedures for isolating energy sources. ANSI Z244.1, "Control of Hazardous Energy Lockout Tagout and Alternative Methods," provides further guidance on best practices for developing and implementing LOTO programs. Proper LOTO devices facilitate compliance by providing reliable physical barriers and clear visual warnings (tags) to communicate that equipment is locked out and should not be operated.
Keying Systems for Padlocks
Padlocks are integral to LOTO procedures, with various keying systems supporting different operational needs. Keyed Different (KD) means each padlock has a unique key, preventing unintended access. Keyed Alike (KA) allows multiple padlocks to be opened with the same key, useful for individuals who manage several lockout points. Master Keyed (MK) systems provide a master key that can open all padlocks within a specific group, while each padlock also has its unique key. Grand Master Keyed (GMK) extends this concept, allowing a single key to open multiple groups of master-keyed padlocks, offering hierarchical control over an entire facility's LOTO system.