Which term sets the maximum anticipated pressure on sprinkler components?

• A. Lavatory
• B. System Working Pressure
• C. Wet Pipe Sprinkler System
• D. Automatic Water Supply

Answer: (B)

System Working Pressure is the maximum pressure the sprinkler system is expected to experience in service, and it’s used to rate and select components so they won’t be stressed or fail under that pressure. This design pressure accounts for the supply, friction losses, and dynamic effects like water hammer, ensuring all sprinklers, pipes, valves, and fittings are rated for at least that level. The other terms don’t set a pressure limit: a lavatory is just a fixture, a wet pipe sprinkler system is a system type, and Automatic Water Supply refers to the water source rather than a design pressure for components.