What Makes a Compliant LOTO Procedure

OSHA 1910.147(c)(4) requires documented energy control procedures for each piece of equipment with hazardous energy. Each procedure must include four elements: a statement of intended use, specific shutdown and isolation steps, device placement and removal steps, and verification testing requirements.

A well-written procedure is also practical. If maintenance workers cannot follow the procedure quickly and clearly on the shop floor, it will be ignored or executed incorrectly, regardless of how compliant it looks on paper.

Step 1: Identify the Equipment

Start with basic identification:

  • Equipment name: The common name used by operators and maintenance staff
  • Equipment number or asset tag: The unique identifier in your maintenance system
  • Location: Building, floor, area, or specific position within the facility
  • Purpose: What the equipment does (the "statement of intended use" required by OSHA)

Use the names and identifiers that workers actually use. If everyone calls it "the blue press" rather than "Hydraulic Press HP-2400," include both.

Step 2: Identify All Energy Sources

This is the most critical step. Walk the equipment with experienced maintenance personnel and identify every energy source:

  • Electrical: Main power supply, control circuits, batteries, capacitors
  • Mechanical: Rotating parts, flywheels, springs, counterweights
  • Hydraulic: Pressurized fluid lines, accumulators, cylinders
  • Pneumatic: Compressed air supply, pressurized vessels, air cylinders
  • Thermal: Steam lines, heated surfaces, heat exchangers
  • Chemical: Process chemicals, reactive substances in lines or vessels
  • Gravity: Elevated components, suspended loads, counterweights

For each energy source, document the type, magnitude (voltage, pressure, temperature), and location. Do not rely solely on electrical schematics or P&IDs. A physical walkdown catches energy sources that drawings miss.

Step 3: Map Each Isolation Point

For each energy source, identify the energy isolating device that controls it. Document:

  • Device type: Circuit breaker, disconnect switch, valve, block, blank flange
  • Location: Specific enough that a worker unfamiliar with the equipment can find it ("Panel 3B, row 2, breaker 7" not "electrical panel")
  • Isolation method: The physical action required (open breaker, close valve, insert block)
  • Required hardware: Lock type, tag, hasps, valve lockout devices, or other hardware needed
  • Lockable?: Whether the device accepts a lock directly or requires an adapter

Remember: push buttons, selector switches, and control circuit devices are not energy isolating devices. Only mechanical devices that physically prevent energy transmission qualify.

Step 4: Document the Shutdown Sequence

Write the steps for safely shutting down and deenergizing the equipment in the correct order. The sequence matters. For example, hydraulic pressure should typically be relieved before closing isolation valves, and mechanical energy from rotating parts must be dissipated before applying locks.

Each step should specify:

  1. What to do (the action)
  2. Where to do it (the specific device and location)
  3. What hardware to apply (lock, tag, block)
  4. What to check (verification for that step, if applicable)

Step 5: Define Stored Energy Release and Verification

After all energy isolating devices are locked out, stored or residual energy must be addressed. Per OSHA 1910.147(d)(5), all stored energy must be relieved, disconnected, restrained, or rendered safe. Common examples:

  • Capacitors must be discharged
  • Springs must be released or blocked
  • Elevated machine parts must be lowered or blocked
  • Hydraulic and pneumatic lines must be bled to zero pressure
  • Steam lines must be drained and vented

Then document the final verification step: attempt to start the equipment using normal operating controls, confirm it does not start, and return all controls to the off position. This is the step that confirms isolation is complete.

Step 6: Document the Reenergization Sequence

The reenergization steps are the reverse of shutdown, but with additional safety checks:

  1. Inspect the work area and remove all tools and nonessential items
  2. Verify all guards and safety devices are reinstalled
  3. Ensure all employees are clear of the equipment
  4. Notify affected employees that energy is being restored
  5. Remove lockout/tagout devices (each worker removes their own)
  6. Reenergize in the correct sequence

Step 7: Assign Roles

Each procedure should identify the authorized employees who may perform the lockout and the affected employees who must be notified. Roles can be assigned by name or by job title, depending on your organization's practice.

Common Procedure Writing Mistakes

  • Vague locations: "Lock out the electrical panel" is not specific enough. Which panel, which breaker, what position?
  • Missing energy sources: Gravity and stored pneumatic energy are frequently overlooked.
  • No verification step: Every procedure must include a try-start verification. It is the only way to confirm that all energy sources have been isolated.
  • Copy-paste procedures: Each piece of equipment has different energy sources and isolation points. Generic templates applied without customization create compliance gaps and safety risks.
  • Outdated procedures: Equipment modifications change energy sources and isolation points. Procedures must be updated when equipment changes, and annual inspections should catch discrepancies.

Paper Templates vs. Digital Procedure Builders

Paper templates and spreadsheets work for a small number of procedures but create problems at scale: inconsistent formatting, version control issues, difficulty tracking which procedures have been inspected, and hours spent on each new procedure.

LOTOBuilder's digital procedure builder standardizes the format, walks you through each required field, generates professional PDF output, and tracks inspection dates automatically. See how it works or start your free trial.