Hydrostatic test pressure shall be measured at which point on a standpipe system?

• A. Highest elevation point
• B. Low elevation point
• C. Inspector test valve
• D. System's most remote point

Answer: (B)

In a hydrostatic test, pressure comes from the weight of the water column above a point. The deeper you go, the higher the pressure. So the point that experiences the greatest pressure in a standpipe is the lowest, or low elevation, point. Measuring there gives the worst‑case reading and ensures the entire system can withstand the test without leaks or failures. If you measure higher up, you’d see a lower pressure and could miss problems that would appear at the bottom. The gauge is placed so you capture the pressure at that lowest point, reflecting the true stress the system must endure during the test.