When two or more high-pressure boilers are connected to a common steam header, what is required for each boiler?

For each high-pressure boiler that is connected to a common steam header, it is required to have two stop valves. This requirement serves several important safety and operational purposes.

The primary reason for having two stop valves is to provide a means of isolating each boiler for maintenance while ensuring that the remaining systems can continue to operate safely. If one boiler needs service, the first stop valve can be closed to isolate it from the steam header, while the second valve serves as an additional safeguard. This configuration minimizes the risk of steam leaks and enhances safety protocols by allowing for double isolation.

Furthermore, the use of two stop valves aids in controlling pressure and flow more effectively within the system. It also complies with safety regulations that help prevent catastrophic failures and ensure that operators and maintenance personnel can work safely.

In summary, having two stop valves for each boiler ensures both safety and operational efficiency in high-pressure steam systems connected through a common header.