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Logical consideration on lockout and trapped key interlock for machine.

Makoto Kimura¹, Noboru Sugimoto

¹Environment & Safety Office, Showa Denko K.K., Tokyo. Makoto_Kimura@sdk.co.jp

Industrial Health

|August 20, 2010

Summary

Lockout procedures are crucial for hazardous energy control during machine maintenance. This study proposes safety requirements for lockout systems, integrating trapped key interlocks for enhanced worker protection.

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Area of Science:

Industrial Safety Engineering
Occupational Health and Safety
Mechanical Engineering

Background:

Lockout procedures are vital for controlling hazardous energy and preventing injuries from unexpected energy releases.
Current lockout methods often compensate for the limitations of the Zero Mechanical State (ZMS).
There is a need for enhanced safety protocols in machine maintenance environments.

Purpose of the Study:

To propose fundamental requirements for lockout procedures in machine maintenance.
To apply the principle of safety confirmation to lockout system design.
To integrate trapped key interlock systems as an alternative or supplement to traditional lockout.

Main Methods:

Formulating interrelations between power switch locking, key control, and guard access within a trapped key interlock system.
Presenting these interrelations using a structured interlock diagram.
Developing an example configuration demonstrating the required safety functions.

Main Results:

Defined basic requirements for effective lockout systems based on safety confirmation principles.
Established a systematic approach to integrate trapped key interlocks with lockout procedures.
Demonstrated a practical configuration for a unified safety system.

Conclusions:

The proposed requirements enhance the safety of lockout procedures for machine maintenance.
Trapped key interlock systems offer a viable and integrated alternative for hazardous energy control.
Systematic formulation of interrelations is key to achieving robust safety functions.