The Dept of Labor has made recommendations following an explosion when incompatible materials stored inside a mining car reacted violently.
The incident occurred on June 3rd, when approximately 20,000 gallons of liquid waste-derived fuel (LWDF), spewed from the railcar for 34 seconds. The eruption sent waste fuel several hundred feet into the air and ripped the manway hatch from the railcar.
The hatch came to rest approximately 370 yards from the railcar. Droplets of LWDF traveled more than 1/3 of a mile, landing on a number of buildings, structures, and vehicles near the facility.
Agitators in several of the LWDF tanks were not maintained in functional condition. The facility was blending and storing incoming loads of LWDF in railcars.
A system of analysis was not in place to ensure the compatibility of the blended LWDF under the conditions in which it was stored.
The following Best Practices are recommended:
- Evaluate work processes and develop acceptance and processing procedures to eliminate and mitigate hazards.
- Use the proper container type (one that does not react with the hazardous material).
- Make sure hazardous material storage containers are located in a safe area.
- Review the uniform hazardous waste manifest and safety data sheets (SDSs) and regularly conduct chemical compatibility analyses. Materials that are incompatible should not be stored together.
- Do not reuse unwashed storage containers that previously contained a different material.
- Regularly inspect equipment for proper operation. Remove damaged containers and equipment from service.
- Ensure a properly designed, installed, and maintained ventilation system is in place where hazardous material is being handled.
- Provide warning signs that display the nature of the hazard(s) and the required personal protective equipment.
- Provide, use, and maintain fixed and portable gas detectors in areas where hazardous gases or vapors can accumulate in a manner capable of causing injury or impairment.
- Train miners on chemical hazards, emergency response procedures, and material handling activities including storage, loading, unloading, and transporting. Have SDSs accessible and ensure that all employees know how to read them.