Free IPC Traps, Interceptors, and Separators Questions and Answers 1 — Questions and Answers
Question 1: According to the IPC, what is the required range for the depth of a liquid seal in a standard plumbing fixture trap?
- 1 inch to 3 inches
- 2 inches to 4 inches (Correct answer)
- 3 inches to 5 inches
- 4 inches to 6 inches
Correct answer: 2 inches to 4 inches
IPC Section 1002.4 specifies that each fixture trap must have a liquid seal of not less than 2 inches and not more than 4 inches. This range is critical for preventing sewer gas entry while ensuring proper self-scouring of the trap.
Question 2: A vehicle repair garage with floor drains is being constructed. Which of the following is required by the IPC before waste is discharged into the building drainage system?
- A grease interceptor
- A sand interceptor
- An oil separator (Correct answer)
- A lint trap
Correct answer: An oil separator
IPC Section 1003.4 explicitly requires that repair garages with floor drains, car-washing facilities, and factories producing oily or flammable wastes must install an oil separator to treat such wastes before they enter the drainage system.
Question 3: Which of the following trap designs is expressly prohibited by the International Plumbing Code because it relies on moving parts to maintain its seal?
- P-trap
- Drum trap
- A trap with a float ball mechanism (Correct answer)
- S-trap
Correct answer: A trap with a float ball mechanism
IPC Section 1002.3 prohibits several types of traps, specifically including those that depend on moving parts to maintain their seal. A trap using a float ball mechanism falls into this category, as the moving part is prone to failure, which would compromise the seal and allow sewer gas to enter.
Question 4: A new restaurant is installing a large, gravity-type grease interceptor outside the building. What does the IPC mandate regarding the installation to ensure proper function and service?
- It must be installed within 5 feet of the final cooking fixture.
- It must be equipped with a vented flow-control device. (Correct answer)
- It must be buried at least 48 inches below grade.
- It must receive waste from sanitary fixtures to ensure constant flow.
Correct answer: It must be equipped with a vented flow-control device.
IPC Section 1003.3.5 requires grease interceptors to be equipped with a flow-control device to ensure the flow does not exceed the interceptor's rated capacity, which is essential for effective grease separation. The flow-control device must also be vented.
Question 5: A commercial car wash is being planned. To handle the heavy solids that will be washed off vehicles, the IPC requires the installation of what specific type of device?
- A hydromechanical grease interceptor
- A solids separator with a chemical feeder
- A sand interceptor with a minimum 6-inch water seal (Correct answer)
- An oil separator with a minimum capacity of 500 gallons
Correct answer: A sand interceptor with a minimum 6-inch water seal
IPC Section 1003.5 requires that sand and similar interceptors for heavy solids be installed in establishments like car washes. The code specifies these interceptors must be readily accessible for cleaning and have a water seal of not less than 6 inches.
Question 6: Regarding the general installation of interceptors and separators, which of the following is a key requirement according to IPC Chapter 10?
- They must be made of cast iron exclusively.
- They must be located in an area with a temperature below 60°F.
- Access must be provided for service and maintenance. (Correct answer)
- They must be cleaned on a bi-annual schedule mandated by the code.
Correct answer: Access must be provided for service and maintenance.
IPC Section 1003.10 states that access shall be provided to each interceptor and separator for service and maintenance. This is a critical requirement to ensure the devices can be regularly cleaned and inspected to function as designed.
Free IPC Traps, Interceptors, and Separators Questions and Answers 1
According to the IPC, what is the required range for the depth of a liquid seal in a standard plumbing fixture trap?