Code Aqua Ammonia Tanks

ASME (American Society of Mechanical Engineers) does not have specific codes or standards for aqueous ammonia tanks. The ASME Boiler and Pressure Vessel Code (BPVC) primarily focuses on the design, construction, and inspection of pressure vessels and boilers. However, there are other industry standards and guidelines that provide recommendations for the storage of aqueous ammonia.

Aqueous ammonia is a solution of ammonia dissolved in water, typically with concentrations ranging from 5% to 30%. It is commonly used in various applications such as refrigeration, cleaning agents, and water treatment. When it comes to storing aqueous ammonia, the following considerations apply:

  1. Material Compatibility: Aqueous ammonia is corrosive to certain metals, so it's important to select materials of construction that are compatible with the solution. Commonly used materials include stainless steel, fiberglass-reinforced plastic (FRP), and high-density polyethylene (HDPE). The selection of materials depends on the concentration of ammonia, temperature, and other factors.
  2. Tank Design: Aqueous ammonia tanks can be designed as vertical or horizontal vessels, depending on the storage requirements. The design should consider factors such as maximum storage capacity, pressure rating, operating temperature, and safety features like venting and emergency relief systems.
  3. Safety Features: Safety measures for aqueous ammonia tanks include pressure relief valves, rupture discs, emergency vents, and leak detection systems. These features help to protect personnel and prevent accidents by ensuring that pressure is relieved and leaks are detected promptly.
  4. Local Regulations: It's important to comply with local regulations and codes specific to the storage of aqueous ammonia. Authorities such as the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA) may have specific requirements regarding the storage, handling, and transportation of hazardous materials.
  5. Inspection and Maintenance: Regular inspections and maintenance are crucial for the safe operation of aqueous ammonia tanks. Visual inspections, leak testing, and integrity assessments should be performed periodically to ensure the tank remains in good condition.

While ASME does not provide specific guidelines for aqueous ammonia tanks, it is advisable to consult other industry standards and regulations. These may include guidelines from organizations like the National Fire Protection Association (NFPA), American National Standards Institute (ANSI), and the American Petroleum Institute (API). Additionally, it's essential to involve qualified engineers and professionals experienced in the design and storage of hazardous materials to ensure compliance and safety.