Which SOPV is capable of being secured only locally on stations?

• A. Local
• B. Master
• C. Remote
• D. Group

Answer: (B)

The idea being tested is where the locking/securement capability sits for different SOPV control configurations. The valve type that is designed to be secured only at the station itself serves as the primary local lockout point for that station. In this setup, you can physically secure the master valve on the station to prevent operation, and that lockout remains effective without relying on remote or group controls. This makes it the option that is specifically intended to be secured locally on each station.

From the other perspectives, remote or group control implies you can secure or operate the valve from a distant control location, not just on the station itself, while a locally secured valve would be secured at the valve itself, but the designation in this context points to the master valve as the one intended for local, station-specific security.