Standard Shutdown Operations

Once the transfer is complete, workers must perform standard shutdown operations to turn off the pumps or compressors, and to disconnect the hoses.

Potential Hazards

• Release of ammonia as a result of improper procedures associated with:
  • Opening and draining process equipment.
  • Locking out equipment for maintenance.
  • Blocking liquid ammonia lines and equipment; this is particularly important for equipment which contains ammonia liquid that is below ambient temperature.

Possible Controls

• Provide ammonia relief systems designed and installed according to generally accepted good engineering practices. [29 CFR 1910.119(d)(3)]
• Provide written procedures [29 CFR 1910.119(f)] and training [29 CFR 1910.119(g)] for lockout/tagout, opening and draining process equipment, and blocking liquid ammonia lines.
• Investigate accidents and near misses that could have resulted in a release of ammonia. [29 CFR 1910.119(m)]
• Establish and implement an emergency action plan in case of release. [29 CFR 1910.119(n)]

To learn more about Ammonia Refrigeration visit our Ammonia Refrigeration Safety Online Training web page.