GB/T 33579-2017Safety of machinery—Control methods of hazardous energy—Lockout/Tagout (English PDF)

3.1 Alarm

Use of auditory or visual means to remind personnel of impending dangers, such as the start-up, movement, failure or malfunction of machines.

3.2 Authorized individual

Personnel assigned to perform hazardous energy control.

3.3 Control circuit

A circuit used to start or interrupt the energy of a machine, OR a circuit of a control device or system used to control the performance of a machine without directly interrupting the energy.

Note: The control circuit can adopt hydraulic, pneumatic, electrical, electromechanical and other methods.

3.4 Control reliability

The ability of a system to prevent or avoid hazardous movement, when a single component of the equipment or system fails.

3.5 Control system

Sensors, manual input and mode selection components, interlocking and voting circuits, output components provided to machine's operating devices or mechanisms.

3.6 De-energized

All energy sources are disconnected and there is no residual or stored energy.

4.1 Manufacturer's responsibilities

Manufacturers shall consider the control of hazardous energy, when designing, manufacturing, installing machines, so that users can effectively control hazardous energy when engaging in relevant activities (see Chapter 1), during the entire life cycle of the machine.

4.2 User responsibilities

Users shall follow the relevant provisions of this standard, to formulate effective plans, to protect personnel engaged in relevant activities (see Chapter 1) during the entire life cycle of the machine, from dangerous energy injuries.

4.3 Responsibilities of authorized individual

Authorized individual shall comply with user-provided programs, procedures, and training for performing hazardous energy control.

5.1 Requirements for manufacturers

5.1.3 Partially energized

For those functions that require partial energization, the manufacturer shall conduct a risk assessment, in accordance with Chapter 5 of GB/T 15706-2012, to determine the safest method of entering the machine. When it is necessary to maintain partial energization (such as to clamp workpieces, preserve information, maintain heat, or provide local lighting), other control methods shall be provided, to ensure the safety of personnel.

5.2 Energy isolation device

5.2.1 General requirements

To meet the requirements of 6.3, the design, construction, and installation of machines shall take into account energy isolation devices, according to their intended use. Energy isolation devices shall be able to control and/or dissipate hazardous energy. Energy isolation devices should be an integral part of the machine.

5.2.2 Location

Energy isolation devices shall be installed in easily accessible locations. If feasible, it shall be located so that the locking device is easy to apply during repair and maintenance.

5.2.3 Identification

All energy isolation devices shall be adequately identified or marked, unless their location and arrangement make their purpose obvious. The identification shall include the following. […]

5.2.4 Performance

Energy isolation devices shall be able to be locked or fixed in an effective isolation position.

5.2.5 Applicability

Each energy isolation device shall be evaluated to determine its applicability for its intended use.

5.4 Warnings and special instructions

The manufacturer shall determine whether warnings and special instructions are required when servicing or maintaining the machine. The manufacturer shall provide appropriate information in the user manual.

5.5 Local component isolation

If a component or system of components requires individual service or maintenance, local component isolation shall be provided when the machine is installed. The number and location of energy isolation devices shall be determined, based on the configuration and intended use of the machine.

5.6 Documentation requirements

The user manual provided by the manufacturer shall detail.

5.7 Stored energy and residual energy

If stored or residual energy has been determined to be hazardous, means for safely dissipating or confining the stored or residual energy shall be integrated into the machine. Devices used to dissipate stored energy shall be designed with means or methods for verifying their location and status.

5.8 Control integration

If other methods are used for setting up, troubleshooting or other tasks requiring de-energization or partial energization, a protection system shall be used, to ensure that the failure of individual components within the device or system can still stop or prevent hazardous movement or release of hazardous energy.

6.1 User responsibilities

6.1.1 Equipment

The user's machine shall meet the requirements of Chapter 5. If the user's machine does not meet the requirements of Chapter 5, the user shall modify and upgrade the machine, to comply with the requirements of Chapter 5.

6.1.2 Solution

Users shall develop a written solution for hazardous energy control; refine the requirements of 6.3 or 6.4. The purpose of the solution is to ensure that before the authorized individual perform the installation, construction, repair, adjustment, inspection, unclogging, setting, troubleshooting, testing, cleaning, disassembly, service, maintenance of machinery, that could unexpectedly energize, start, or release stored energy and cause injury, the risk of exposure to hazard is eliminated or minimized (see Figure 1).

6.2 Control methods

The choice of hazardous energy control method depends on whether the task can be performed under energized conditions. Generally, the preferred method of hazardous energy control is lockout/tagout as specified in 6.3.

6.3.2.3.3 Confirmation

Each procedure shall be verified by industry experts for accuracy, completeness, and effectiveness of energy controls.

6.3.2.3.4 Approval

Each procedure shall be approved by the user's designated personnel before implementation.

6.3.2.4 Protective materials and hardware

The user shall provide all protective materials and hardware, which are needed to achieve energy isolation.

6.3.2.5 Energy isolation

Lockout and tagout shall only be done by authorized individual.

6.3.3 Energy control elements

6.3.3.1 General requirements

Energy control elements shall include the following actions; meanwhile it shall be performed in the order of 6.3.3.2 ~ 6.3.3.10.

6.5 Communication and training

6.5.1 Communication

It is the user's responsibility to inform all personnel of the appropriate levels of hazardous energy control and to notify appropriate authorized individual of all aspects of the hazardous energy control solution, such as plan changes, incident experience, plan progress, work performance data, review results, other relevant details.

6.6 Review of hazardous energy control solution

6.6.1 General requirements

Users shall regularly evaluate the condition and effectiveness of each element of hazardous energy control solution (see 6.2). The assessment shall include at a minimum: written procedures, specific machinery and processes, lockout/tagout hardware, energy isolation devices, other control methods, communication and training.

6.6.3 Application of specific procedures

Compliance with specific hazardous energy control procedures is critical. Therefore, users shall establish an ongoing audit plan, to provide the latest information on the effectiveness of maintenance applications. Users are responsible for executing an audit plan, to verify full compliance with procedures. Audits shall be conducted at least annually; documentation shall be retained for at least 3 years. […]