IPC Sanitary Drainage Systems 3

Question 1

According to the IPC, what is the minimum size for a building sewer serving a building with 150 DFU?

Accepted Answer

4 inches

Answer

3 inches

Answer

5 inches

Answer

6 inches

Question 2

What does the IPC specify regarding the use of solvent cement joints on underground drainage piping?

Accepted Answer

They are permitted for ABS and PVC drainage pipe

Answer

Solvent cement joints are prohibited underground

Answer

Only mechanical joints are permitted underground

Answer

Solvent cement is only for above-ground use

Question 3

Under the IPC, what protection is required where drainage piping passes under a building foundation?

Accepted Answer

A sleeve or casing two pipe sizes larger must be used

Answer

No special protection is needed

Answer

Only cast iron pipe is permitted

Answer

The pipe must be encased in concrete

Question 4

According to the IPC, what is the minimum diameter for a drainage stack serving water closets?

Accepted Answer

3 inches

Answer

2 inches

Answer

4 inches

Answer

6 inches

Question 5

What does the IPC require regarding the grade of underground horizontal drainage piping?

Accepted Answer

A uniform grade throughout the entire run

Answer

Variable grade is acceptable if the minimum is maintained

Answer

No grade requirements apply underground

Answer

Reverse grade is acceptable for short distances

Question 6

Under the IPC, when is an oil separator required on a drainage system?

Accepted Answer

When flammable liquids or oils may be discharged into the system

Answer

In all commercial buildings

Answer

Only in buildings with emergency generators

Answer

Oil separators are never required by the IPC