Water Supply & DistributionQuestion 55 of 360
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.Undersize the risers to save material
b.Add extra elbows to slow the water
c.Size the trunk and risers for the combined demand and keep developed length and fittings reasonable
d.Remove the shutoff valves
Explanation
Sizing the trunk and risers for the combined simultaneous demand while keeping developed length and fittings reasonable minimizes friction and pressure loss to upstairs fixtures. Undersizing risers, adding elbows, or removing valves would increase loss or reduce control, not help.
Law Reference: 2022 California Plumbing Code (CPC) §610.0Practice all 360 questions free — no signup required.
Related questions on this topic
- PEX tubing is being routed through a framing environment where it could be exposed to sunlight through a skylight for extended periods. What limitation applies?
- Where must a readily accessible full-open shutoff valve be provided on the building water supply?
- To allow individual maintenance, where does good practice and code generally require shutoff (angle stop) valves in a dwelling?
- 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?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review