When filling a hose line to test, a pump pressure of ______ psi is maintained.

• A. 30 psi
• B. 50 psi
• C. 75 psi
• D. 100 psi

Answer: (B)

When charging a hose line for a test, you want a moderate, controlled pressure that fills the line without stressing the gear. Fifty psi at the pump provides that balance: it’s high enough to push water through the entire length so you can see any leaks or loose fittings, but low enough to minimize wear on hose and couplings and to reduce the risk of water hammer or damage if there’s a weak spot. If you used too little, like thirty psi, air pockets might stay and the far end might not fill fully, making leaks hard to detect. Too much pressure—seventies or a hundred psi—adds unnecessary stress, increases friction losses, and isn’t needed just to fill and inspect the line. So fifty psi is the practical, safe choice for this fill-and-check test.