Systems & CodeQuestion 53 of 110
An oil-water separator serves three garage floor drains each rated at 20 gpm. The code allows sizing at 75 percent of the total connected flow for diversity. What design flow sizes the separator?
a.45 gpm
b.30 gpm
c.60 gpm
d.80 gpm
Explanation
Total connected flow = 3 x 20 = 60 gpm, and at 75 percent diversity the design flow is 60 x 0.75 = 45 gpm. The separator must be large enough to let oil rise and separate before the water passes on to the sewer. Undersizing lets oil carry through and creates an explosion hazard in the sewer.
Law Reference: UPC §705.0Practice all 110 questions free — no signup required.
Related questions on this topic
- A medical gas distribution system has a working pressure of 50 psi. The installation acceptance test is performed at 1.5 times the working pressure. What is the required test pressure?
- A thermostatic mixing valve blends 140 F stored water with 60 F cold water to deliver 110 F tempered water at a public lavatory. Using a mass balance, what fraction of the delivered flow must be the 140 F hot water?
- A public toilet room fixture count is based on occupant load. If a code table requires one water closet per 40 occupants and the occupant load is 210, how many water closets are the minimum required?
- A laboratory discharges 10 gpm of acid waste that must be diluted with water at a 5-to-1 ratio (water to acid waste) before it enters the neutralizing tank. How much dilution water is required?
- An air admittance valve (AAV) is used to vent an island fixture. Which condition must be met for the AAV to be acceptable?
- A boiler feed with chemical treatment connects to potable water. This is a high-hazard connection. Which assembly protects the potable supply against backpressure from the pressurized boiler?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Master Plumber Licensing Exam (UPC/IPC-based) · How we review