FREE IPC Traps, Interceptors, and Separators 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?

Accepted Answer

2 inches to 4 inches

Answer

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?

Accepted Answer

An oil separator

Answer

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?

Accepted Answer

A trap with a float ball mechanism

Answer

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?

Accepted Answer

It must be equipped with a vented flow-control device.

Answer

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?

Accepted Answer

A sand interceptor with a minimum 6-inch water seal

Answer

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.

IPC - International Plumbing Code Practice Test

IPC - International Plumbing Code Practice Test

FREE IPC Traps, Interceptors, and Separators Questions and Answers