When used as an agricultural fertilizer, NH3 is compressed into a liquid. This requires a substantial amount of pressure and specially designed tanks and equipment. If not stored or transported properly serious injuries are possible.
The resources below include safety measures and the state requirements for storage of NH3.
Storage Permit Requirements
All firms that distribute fertilizer must have a fertilizer license. If you are storing anhydrous ammonia, you are required to maintain an Anhydrous Ammonia Storage Permit.
- Permit Application Information & Worksheet (PDF)
- Storage Permit Application - New Installation or Change in Ownership (PDF)
- Storage Permit Application – Substantial Alternation (PDF)
Storage Guidelines & Requirements
- Manifold & Pressure Relief Valve (PRV) Requirements (PDF)
- Anhydrous Ammonia System Piping Requirements (PDF)
- Pipe Welding (PDF)
- Procedure for Testing a Pressure Actuated Bypass System (PDF)
- Testing a Pressure Actuated Bypass System (MDA YouTube)
- Tank Marking and Placarding Requirements (PDF)
- Storage Facility Traffic Protection Guidelines (PDF)
- Storage Facility Transfer System Guidelines and Requirements (PDF)
- Anhydrous Ammonia Cargo Tank/Nurse Tank Riser Area Pull-Away Protection (PDF)
- Emergency Eyewash & Shower Specifications - Minnesota OSHA (PDF)
Storage Inspection Forms & Information
- Service Status Policy (PDF)
- Storage Facility Inspection Checklist (PDF)
- Pressure Relief Valve (PRV) Installation/Replacement Record (PDF)
- Anhydrous Ammonia Program Staff Inspection Area Map (PDF)
- List of Anhydrous Ammonia Inspection Service Companies
- “R” Stampholders (Minnesota & Other States) - “R” Stampholders (Minnesota & Other States) – Instructions: Once in the National Board Manufacturer and Repair Directory web page go to the “Manufacturer and Repair Directory Search Form”. Select the state and stamps (i.e. “R”), then click on the “Search” button to obtain the “R” stampholders for the selected state.
Rules & Statutes Addressing Anhydrous Ammonia Storage
- Minnesota Fertilizer, Soil Amendment and Plant Amendment Law (Minn. Stat., Section 18C.001-18C.575)
- Minnesota Storage and Handling of Anhydrous Ammonia Rules (Minn. Rules, Parts 1513.0010-1513.1100)