What is the test pressure for the low side of an NH3 system?

In an NH3 (ammonia) refrigeration system, the test pressure for the low side is typically established based on safety and operational guidelines designed to ensure the integrity of the system. According to established standards and practices for ammonia refrigeration systems, a test pressure of 150 psi is commonly used for the low side. This pressure is sufficient to verify that the system can hold refrigerant without leaking and is within the operational range when considering the potential fluctuations in pressure during typical system functioning.

This choice aligns with standard industry practices that emphasize ensuring the reliability and safety of refrigeration systems. Other pressures listed, while they may be applicable in specific scenarios or different contexts, do not represent the established testing pressure for the low side in NH3 systems as per the guidelines typically followed in Minnesota and the broader industry. Adopting a test pressure that is too high or too low can either unnecessarily stress the system or fail to adequately verify its integrity, which is why 150 psi is the appropriate and widely accepted standard.