AdministrationQuestion 78 of 110
A DWV rough-in is water tested. The test fills the system with water to create a 10 ft head at the lowest point. Using 0.433 psi per foot, what pressure does a 10 ft water column exert at the base, and what does the test prove?
a.2.3 psi, that vents are clear
b.4.33 psi, that joints hold under head with no leaks
c.10 psi, that slope is correct
d.0.43 psi, that traps are set
Explanation
A 10 ft column exerts 10 x 0.433 = 4.33 psi at the base, and holding that head for the required time proves every joint below the fill line is watertight. The water (or an equivalent air) test is applied before the piping is concealed. A dropping level indicates a leak to be located and repaired.
Law Reference: UPC §712.0Practice all 110 questions free — no signup required.
Related questions on this topic
- A jurisdiction charges a plumbing permit fee of a $75 base plus $12 per fixture. A project has 18 fixtures. What is the permit fee?
- During construction the plumbing is inspected in stages. Which sequence correctly orders the common inspections?
- On an isometric, a 45-degree offset must clear an obstruction, producing a 24 in vertical offset. For a 45-degree fitting the travel (diagonal) length equals the offset times 1.414. What is the travel length of pipe between the two fittings?
- A plumbing job has a direct cost of $9,000. The contractor wants a 20 percent profit margin measured on the selling price (not markup on cost). Using price = cost / (1 - margin), what is the selling price?
- A master plumber estimates a job. A takeoff lists 260 ft of 3/4 in copper, 40 ft of 1 in copper, and 18 fittings. What is the estimator computing at this stage?
- A plumbing contractor prices a job using material of $4,200 and labor of $6,000, then adds 15 percent overhead and 10 percent profit on the combined cost. What is the approximate bid price?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Master Plumber Licensing Exam (UPC/IPC-based) · How we review