Anhydrous Ammonia Safety and Regulatory Compliance
A certified applicator plans to apply anhydrous ammonia (82-0-0) to 80 acres at 140 lb N/ac. The nurse tank is transported 30 miles on a public highway. The applicator notices a small leak at a hose connection and a worker without PPE approaches. The farm is in a state that requires a permit for anhydrous ammonia storage over 10,000 lb. The tank holds 3,000 gal (about 15,000 lb).
1. Calculate the product needed per acre and identify the safety and regulatory issues.
Read the worked answer
Product needed: 140 lb N/ac ÷ 0.82 = ~171 lb product/ac. For 80 acres, 171 × 80 = 13,680 lb product, or about 6.8 tons.
Safety issues:
- Anhydrous ammonia is a caustic gas/liquid; the leak requires immediate stop, evacuation, and PPE (goggles, face shield, gloves, respirator). The worker without PPE must be kept away.
- The applicator should shut off the valve, use water to absorb vapor if safe, and follow emergency procedures.
Regulatory issues:
- The 3,000-gal tank (~15,000 lb) exceeds the 10,000-lb threshold, so a permit is required.
- Transport on public highways requires compliance with DOT and state rules (placards, training, security).
- The leak must be reported if it meets reportable quantity thresholds.
2. Describe the ethical and professional responsibilities of the applicator in this situation.
Read the worked answer
The applicator must:
- Protect human health first: stop the leak, keep the unprotected worker away, and call for emergency help if needed.
- Follow the law: report the leak if required, maintain permits, and ensure transport compliance.
- Be honest and transparent: document the incident, notify the employer and landowner, and avoid hiding the leak.
- Maintain competence: ensure all workers are trained and have PPE.
- Uphold stewardship: prevent environmental release and protect neighbors.
Professional ethics require prioritizing safety over schedule and cost, and accurately recording the event for regulatory and liability purposes.