What is necessary in a double indirect open spray system in case of refrigerant rupture?

In a double indirect open spray system, it is crucial to have an additional safety loop in the event of refrigerant rupture. This is because the design of such systems often relies on circulating a secondary fluid, which is normally water or another heat transfer fluid, to manage the temperature and pressure within the refrigeration cycle.

In the case of a refrigerant leak, the integrity of the original refrigerant loop is compromised, potentially leading to hazardous conditions. The additional loop acts as a safeguard by allowing continued operation and providing a buffer zone that can help control system pressures and minimize the risk of further leaks or system failure. It effectively allows the system to remain operational while mitigating any risks associated with the rupture.

While increased ventilation, automatic shutoff, or a containment vessel may provide some level of safety or risk mitigation, they do not directly address the problem presented by a refrigerant leak in this specific system configuration as effectively as an additional loop. Hence, incorporating this additional safety loop is the most practical measure in maintaining system safety and reliability.