Deck 20: Plumbing Codes: Traps and Interceptors

Question 1

Traps isolate buildings from sewer gases by containing a liquid seal ranging from:

A)1 to 3 inches
B)4 to 6 inches
C)3 to 5 inches
D)2 to 4 inches

Answer 1

D

Question 2

How are oil interceptors sized?

A)based on the are flowing out of the separator and gallons per minute of rated flow
B)based on the area flowing into the separator and gallons per minute of rated flow
C)based on likelihood of discharge flammability
D)all of the above

Answer 2

B

Question 3

It is a violation of all codes to have a fixture double-trapped, meaning the discharge of one trap feeds into the inlet of another trap.

Answer 3

True

Question 4

Both the IPC and UPC dictate that pressures within the system should not fluctuate more than how much?

A)plus or minus 2-inch water column
B)plus or minus 1-inch water column
C)plus or minus 3-inch water column
D)plus or minus 1/2-inch water column

Question 5

How does a waterless urinal operate?

A)maintenance flushes water through once per day
B)local collection bin, emptied regularly
C)trap seal cartridges with fluid less dense than urine
D)interior partition

Question 6

Which of the following is NOT a typical reason why traps lose their seals?

A)capillary action
B)evaporation
C)horizontal venting
D)back pressure

Question 7

Which type of interceptor is required when fixture discharge or a drain contains solids or semi-solids heavier than water?

A)sand
B)grease
C)oil
D)acid

Question 8

Which of the following is the most likely setting for a grease interceptor?

A)hospital
B)commercial kitchen
C)day-care center
D)doctor's office

Question 9

With as little as 1 inch of water column, traps provide a liquid seal that prevents sewer gases from entering habitable spaces .

Question 10

All interceptors are sized according to what?

A)maximum volume and rate of fixture discharge
B)minimum volume and rate of fixture discharge
C)maximum volume multiplied by the rate of fixture discharge
D)minimum volume multiplied by the rate of fixture discharge

Question 11

Which of the following is the distance the trap can be from the nearest vent?

A)trap arm length
B)vertical trap length
C)horizontal trap length
D)all of the above

Question 12

Which of the following is NOT required by code for the installation of grease interceptor?

A)each fixture discharging into the interceptor must be individually trapped and vented
B)each grease interceptor must be installed and connected so it can be easily inspected
C)discharge piping from interceptor must be directly connected to sanitary drainage system
D)all of the above

Question 13

Which of the following is a prohibited trap?

A)moving-part traps
B)bell traps
C)crown-vented traps
D)all of the above

Question 14

What type of interceptor would most likely be located in a repair or service garage, car wash, or manufacturing facility?

A)sand
B)oil
C)grease
D)dirt

Question 15

All fixtures and drainage openings are required to have traps.