How is the single vent line area determined for gas overpressure relief devices?

How is the single vent line area determined for gas overpressure relief devices?

• A. Equal to the largest relief device opening
• B. Equal to the total area of all openings
• C. The largest relief device opening or pressure regulator opening plus 50% of the total area of the other relief device openings
• D. Sum of all openings without adjustment

Answer: (C)