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Ammonia

MOGAS valves in ammonia plant
These 10-inch ASME 900 Class ESD valves installed in an ammonia plant have a stroke time of under 3 seconds.

Ammonia is a colorless gas that consists of nitrogen and hydrogen (NH3). Because of its low boiling point, as a liquid it must be stored under pressure or at a low temperature.

Industrial ammonia is sold either as ammonia liquor or as pressurized or refrigerated anhydrous liquid ammonia transported in tank cars or cylinders. Household ammonia or ammonium hydroxide is a solution of NH3 in water. Most ammonia is consumed in the manufacturing of fertilizer. It is also a building block for the synthesis of many pharmaceutical products and is used in many commercial cleaning products.

Dangers during the production of ammonia include:

  • extreme high operating pressures and high-pressure steam
  • rapid skin or eye irritation when exposure to low concentrations of ammonia
  • coughing and nose and throat irritation from inhalation
  • extreme risk of frostbite if liquefied ammonia is exposed to ambient condition in the presence of personnel

MOGAS valve designs include specific features to protect from the dangers of ammonia production, such as:

  • pressure-energized sealing
  • a dual guided stem to prevent packing leaks and risk of fugitive emissions
  • application-specific materials to combat severe service conditions

Multiple MOGAS product lines are applicable at varying price points.

Typical Operating Conditions:
  • Low to high temperature: -50 – 1200° F (-45 – 660° C)
  • High pressure: 100 – 3200 psig (6.9 – 220.6 bar g)
  • Complex flow scheme / massive recirculation
  • High-pressure steam
Ammonia Process Flow Diagram
  1. Fresh Air
  2. Compressed Air
  3. Fresh Methane Feed
  4. Heated Methane
  5. De-Sulphurized Methane
  6. De-Sulphurized Methane-Steam Mix
  7. Heater Outlet Mix Reformer
  8. Reformer Outlet Heat Exchanger
  9. CO Shift Converter Intermediate
  10. CO Shift Converter Outlet
  11. Process Steam
  12. Raw Synthesis Gas
  13. Carbon Dioxide Stripper Intermediate
  14. Carbon Dioxide Absorber Intermediate
  15. Carbon Dioxide Absorber Outlet
  16. Methanator
  17. Dryer Inlet
  18. Fresh Synthesis Gas
  19. Synthesis Compressor Gas
  20. Ammonia Converter / Rectifier Column Intermediate
  21. Ammonia Converter / Rectifier Column
  22. Recycle Synthesis Gas
  23. Refrigeration Exchanger
  24. Refrigeration Compressor Inlet
  25. Refrigeration Compressor Outlet
  26. Ammonia Condenser / Separator
  27. Ammonia Final Recycle
  28. Ammonia Final Purge
  29. Ammonia Surge Drum Recycle
  30. Warm Ammonia
  31. Cold Ammonia 
 
  • Heat Exchanger (not shown)
  • General Ball Valves (not shown)
 
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