Under what condition are shutoff valves not required in a low-pressure steam boiler system?

In low-pressure steam boiler systems, shutoff valves are required to ensure safety and maintain control over the steam flow. However, when there is a single low-pressure steam boiler installed, the need for shutoff valves can be mitigated due to the simplicity of the system.

In a system with only one boiler, there is typically less risk of needing to isolate multiple components for maintenance or other operational purposes. The presence of only one boiler means that if a shutdown is needed, the entire system can be taken offline without the need for additional isolation points. This streamlining simplifies operations, reduces potential failure points, and aligns with code requirements that consider redundancy and safety strategies.

In contrast, other scenarios, like multiple boilers or automation, may introduce complexities where shutoff valves become essential for flexible operation, maintenance access, or safety in case of enabling or disabling specific parts of the system. Therefore, the absence of a requirement for shutoff valves in a single boiler installation is based on the lower risk associated with that operational setup.