Which net discharge pressure corresponds to 50% discharge?

• A. 150 psi
• B. 250 psi
• C. 200 psi
• D. 300 psi

Answer: (B)

Net discharge pressure is the pressure you read at the discharge when the pump is delivering a defined fraction of its rated flow. For the MWS fire practice test, the 50% discharge point is defined such that the net discharge pressure comes out to about 250 psi once hose, fittings, and nozzle losses are included. This matches the standard pump curve used in the test setup: at half the rated flow, the pressure reading sits around 250 psi. The other pressures listed correspond to different flow fractions and do not meet the 50% discharge condition, so 250 psi is the correct reading for 50% discharge.