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Anhydrous Ammonia

Anhydrous Ammonia. Health hazards. Irritant to mucous membranes Corrosive effects from high levels Coughing and bronchial spasms. 1a. Health hazards. Edema, strangulation, asphyxia Rapidly fatal when concentrations are 5,000 to 10,000 ppm

beverlyleonard
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Anhydrous Ammonia

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  1. Anhydrous Ammonia

  2. Health hazards • Irritant to mucous membranes • Corrosive effects from high levels • Coughing and bronchial spasms 1a

  3. Health hazards • Edema, strangulation, asphyxia • Rapidly fatal when concentrations are 5,000 to 10,000 ppm • Immediately fatal when concentration is greater than 10,000ppm 1b

  4. Health hazards • Chemical burn from vaporization of liquid ammonia • Workers with chronic respiratory problems/sensitivity should avoid ammonia exposure 1c

  5. Tank preparation for unloading operations • Reliable, trained workers only • Set brake, block wheels 2a

  6. Tank preparation for unloading operations • Caution signs • Size • At least 12 inches (30 cm) by 15 inches (38 cm) • Material • Metal or comparable material 2b

  7. Tank preparation for unloading operations • Caution signs • Wording • STOP - Tank Car Connected • STOP - Men at Work • Lettering • White on blue background • At least 3.9 inches (10 cm) high • Other words at least 2 inches (5 cm) high 2c

  8. Tank preparation for unloading operations • Tank car must be substantially level 2d

  9. Unloading tank cars • Do not unload unless consigned for delivery and unloaded on private track • Lading must be piped from car to permanent storage tanks when private track is not available 3a

  10. Unloading tank cars • Delivery and removal of loaded unit tanks from a tank car DOT-106A or 110A is not allowed on carrier tracks • Attendant must be present at all times during unloading, while connections are in place 3b

  11. Unloading tank cars • Equipment for ammonia service • Pumps • Compressors • Backflow check valves • Excess flow valves 3c

  12. Unloading tank cars • Connections must be securely attached before unloading starts • Remove unloading connection after completion of loading 3d

  13. Emergency procedures • Ammonia leaks detected by odor • Know employee procedures in event of a leak 4a

  14. Emergency procedures • Ammonia is lighter than air • Stay low to the ground, and move upwind 4b

  15. Emergency procedures • Wear an emergency escape respirator, if available 4c

  16. Summary of main points • Hazards involved • Preparation for unloading of tank car • Unloading procedures • Emergency procedures 5a

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