How much will pressure rise for every 1°F of heat exposure in an ammonia liquid line with trapped liquid?

In the context of ammonia refrigeration systems, understanding the relationship between temperature and pressure is crucial for safe and effective operation. When dealing with a liquid line containing trapped liquid ammonia, any increase in temperature results in an increase in pressure. This phenomenon is a direct consequence of the properties of ammonia as a refrigerant and the principles of thermodynamics.

The correct answer indicates that for every 1°F increase in heat exposure, the pressure can rise significantly, specifically in the range of 100 to 150 pounds PSIG. This large pressure increase reflects the high sensitivity of ammonia to changes in temperature, emphasizing the need for careful monitoring and management of temperatures in the system. Ammonia's phase behavior and properties make it important to maintain proper operating conditions to prevent excessive pressure buildup, which could lead to safety hazards, including possible equipment failure or rupture.

The other ranges provided do not accurately reflect the behavior of ammonia under these conditions. The pressure increase associated with 1°F of heat exposure is notably larger, demonstrating that temperature control is critical for safe ammonia refrigeration operations. Understanding this relationship helps ensure the integrity of refrigeration systems and the safety of personnel working around them.