IPC Traps, Interceptors, and Separators 2

Question 1

According to the IPC, what is the required water seal depth for a standard fixture trap?

Accepted Answer

2 inches

Answer

The IPC requires a minimum water seal depth of 2 inches and a maximum of 4 inches for standard fixture traps.

Question 2

What does the IPC specify about the use of double trapping on a plumbing fixture?

Accepted Answer

Double trapping is prohibited

Answer

The IPC prohibits double trapping — installing two traps in series on the same fixture drain — because it creates a trapped air space that impedes drainage.

Question 3

Under the IPC, what type of trap is specifically prohibited for use in drainage systems?

Accepted Answer

S-trap

Answer

The IPC prohibits S-traps because their configuration makes them highly susceptible to self-siphonage, which can empty the trap seal.

Question 4

According to the IPC, what is the minimum size grease interceptor required for a commercial kitchen with three compartment sinks?

Accepted Answer

The size is determined by flow rate calculation, not a fixed size

Answer

The IPC requires grease interceptor sizing based on flow rate calculations considering the number and type of fixtures connected, not a single fixed size.

Question 5

What does the IPC require regarding maintenance access to interceptors and separators?

Accepted Answer

They must have readily accessible covers for cleaning and maintenance

Answer

The IPC requires that all interceptors and separators have readily accessible covers or access points for regular cleaning and maintenance.

IPC - International Plumbing Code Practice Test

IPC - International Plumbing Code Practice Test

IPC Traps, Interceptors, and Separators 2