ASME Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

When boilers are in battery, meaning they are connected to operate in conjunction with one another, having two stop valves for each boiler serves as an essential safety and operational requirement. The rationale behind this requirement is to ensure that each boiler can be isolated from the system without affecting the others.

Two stop valves provide additional safety by allowing for maintenance or emergency situations where shutting down one boiler is necessary while others continue to operate unaffected. This setup minimizes the risk of backflow and ensures that pressure and temperature can be controlled independently in each unit.

In contrast, having a separate fuel source for each boiler may not be necessary or practical, as they can often share a fuel source designed for multiple boilers. While independent operation of each boiler can be beneficial, the primary focus in this context is on safety and maintenance protocols established by having the requisite stop valves. Furthermore, sharing a drain among multiple boilers may lead to dangerous cross-contamination or complications in draining processes, making the requirement of individual stop valves even more critical.