The two types of SOPVs are Master and Group. Master SOPVs are what?

• A. will sometimes operate
• B. will always operate
• C. never operate
• D. require manual reset

Answer: (B)

Master SOPVs are the primary, automatic shutoff devices in the SOPV system. They are designed to respond to a shutdown signal every time it’s issued, providing a complete, automatic isolation of the transfer line. This reliability is essential for safety and spill prevention because it ensures the system shuts down deterministically without needing operator intervention. Group SOPVs depend on the master and support the overall isolation, but the master’s job is to act in every shutdown event. That’s why the correct choice is that the master will always operate. The other options imply inconsistency, no operation, or a need for manual reset, which would undermine automatic safety shutoff.