Water Supply & DistributionQuestion 60 of 360
A homeowner reports faucets that hammer and leak, and you measure 105 psi static. Besides installing arrestors at quick-closing valves, what is the primary corrective action?
a.Increase pressure to 120 psi
b.Remove all aerators
c.Do nothing under 110 psi
d.Install a pressure-reducing valve to bring static pressure to 80 psi or less
Explanation
Since 105 psi exceeds the 80 psi limit, the primary correction is a pressure-reducing valve to lower static pressure to 80 psi or less, which also reduces stress and hammer. Increasing pressure worsens the problem, removing aerators does not fix pressure, and doing nothing violates the 80 psi limit.
Law Reference: 2022 California Plumbing Code (CPC) §608.2Practice all 360 questions free — no signup required.
Related questions on this topic
- To allow individual maintenance, where does good practice and code generally require shutoff (angle stop) valves in a dwelling?
- A two-story home has the main run in the crawlspace and risers to the second floor. To minimize pressure loss to upstairs fixtures during simultaneous use, which strategy is best?
- A dental office has vacuum and treatment equipment connected to the potable supply, presenting a health hazard with possible backpressure. Which premise-isolation assembly is appropriate?
- After installing a new RP assembly on a high-hazard connection, what ongoing requirement typically applies?
- Threaded steel (galvanized) water pipe is run horizontally. What is the typical maximum horizontal support spacing?
- A single check valve is proposed as backflow protection for a high-hazard chemical connection. Why is this not acceptable?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review