Working with Anhydrous Ammonia—1895 Only

These notes are a supplement to a thorough understanding of the Material Safety Data Sheet, and other safety training. They are not intended to replace other sources of safety information. Read safety instructions from anhydrous ammonia supplier and equipment supplier. They are included as a reminder of safe working practices.

1. Anhydrous ammonia poses three distinct hazards to humans.

   1. It is a desiccant which aggressively attracts water from whatever it comes in contact with. Eyes are particularly vulnerable to damage. ALWAYS WEAR NON-VENTED GOGGLES when working on equipment. Any exposed skin surface can also be damaged. ALWAYS WEAR RUBBER GLOVES when working on anhydrous equipment. It is a good idea to work with skin covered by heavy cotton rather than exposed.

   2. Anhydrous ammonia is typically stored under pressure. When exposed to atmospheric pressure, it boils at –33.4 degrees C (–28 degrees F). The vaporization freezes whatever the liquid NH3 is in contact with. Each .45 kg (1 lb.) of Anhydrous Ammonia (NH3) that vaporizes is capable of freezing about 1.8 kg (4 lb.) of water. ALWAYS WEAR RUBBER GLOVES when working on anhydrous application systems. Exposed skin is vulnerable.

   3. The third danger is to the respiratory system if high concentrations of NH3 are breathed in. STAY OUT OF HIGH CONCENTRATIONS OF ANHYDROUS AMMONIA. Stay up wind of the fittings you are working on. Verify that valves are closed and pressure in lines is released before breaking fittings. Plan an escape routes from any working position. Before activating the application system, know where your co-workers are.

2. If you come in contact with anhydrous ammonia:

   1. Get away from the exposure immediately.

   2. IRRIGATE THE AFFECTED AREA WITH WATER IMMEDIATELY AND CONSTANTLY.

   3. Seek medical assistance.

3. Caution is required when working around NH3. Disconnected hoses may still have liquid anhydrous in them. Plugged fertilizer tubes may have pressurized ammonia behind the plug. Plan your work with safety in mind, wear protective equipment, and know your escape routes and emergency water sources in case of an accident.