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It’s common knowledge specific MSHA standards are in place concerning lockout/tagout (LO/TO) before performing repairs or adjustments to mining equipment or infrastructure. However, an accident can still occur if we fail to remember the possibilities of motion or stored energy sources.
The first line of defense in blocking against motion injuries is to de-energize and lock out the equipment as we are preparing to work on it. This is common practice in the mining industry, but there continues to be fatalities, accidents, and near misses reported annually due to failure to follow the required steps of blocking against motion or stored energy.
Work should never be performed on a conveyor belt or equipment while it is energized. Removing the power alone is never enough to guarantee our safety. The initial steps are not complete until the power has been removed and properly locked and tagged out of service. After properly performing all LO/TO requirements, consider the following: Is there any stored energy that should be released or items that should be securely blocked against motion?
When working on conveyor belts, we should not only consider the drive itself, but also the belt take-up unit as well. A good idea is to place visual reminders on head drive receptacles, noting that drives and take-ups should be locked and tagged when any conveyor work is being performed.
Other forms of blocking against motion include securing equipment, loads, or moving parts of machinery from incidental movement while the work is being performed. If you are working on any equipment, booms, pans, wheels, etc., you should use crib block or other approved blocking devices that are designed specifically for the job. Also, we should never use a jack as a stand-alone item. Jack stands or cribbing should be utilized as a secondary means of support.
The most common excuse for using the wrong blocking material normally ties back to time – it was faster, more convenient, or maybe the material you needed was just too far away. If we plan our work, we should also plan for maintenance activities. Keep several crib blocks close by the section and stored neatly. This will save time but, most importantly, keep you safe!
Many accidents happen each year because someone fails to block against motion. Realizing what can happen and planning for it can eliminate this type of accident.
KEMI does not assume liability for the content of information contained herein. Safety and health remain your responsibility. This information is to be used for informational purposes only and not intended to be exhaustive or a substitute for proper training, supervision or manufacturers’ instructions/recommendations. KEMI, by publication of this information, does not assume liability for damage or injury arising from reliance upon it. Compliance with this information is not a guarantee or warranty that you will be in conformity with any laws or regulations nor does it ensure the absolute safety of any person, place or object, including, but not limited to, you, your occupation, employees, customers or place of business.
