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Trap Arm
Venting
Trap Sizing
Water Heaters
Water Supply
General
100

What is the maximum trap arm length for 1 1/2" pipe?

3 1/2 feet or 42"


100

How many fixture can a 2" vent pipe convey?

24 fixture units

100

What is the minimum trap size for a bath tub?

1 1/2"

100

At what location on a water heating tank are earthquake straps required?

Upper and lower 1/3rd of tank

100

What is the maximum static pressure allowed inside of a building?

80 PSI

100

What is the maximum distance for support on a horizontal 2" ABS pipe?

4 feet

200

What is the maximum trap arm length for 2" pipe?

5 feet or 60"

200

How many fixture can a 1 1/2" vent pipe convey?

fixture units
200

What is the minimum trap size for a shower?

2"

200

What is the minimum distance PEX piping can be from a water heater?

18"

200

What is the minimum static pressure allowed inside of a building?

15 PSI

200

What is the maximum distance for support on a horizontal 3/4" PEX pipe?

32"

300

What is the maximum trap arm length for 3" pipe?

6 feet or 72"

300

How many fixture can a 3" vent pipe convey?

84 fixture units

300

What is the minimum trap size for a exposed trap urinal?

1 1/2"

300

What is the temperature and pressure rating for a standard water heater relief valve?

210 degrees & 150 psi

300

Is the static water pressure at the meter is 80 PSI, and the highest fixture is 30 feet above the meter, what is the static pressure at the highest fixture?

65 PSI

300

What is the cross sectional area in square inches of a 4" sewer pipe

12.57 sq inches


400

What is the maximum trap arm length for 4" pipe?

10 feet or 120"

400

How many fixture can a 4" vent pipe convey?

256 fixture units

400

!!!!!!DAILY DOUBLE!!!!!!


What is the minimum trap size for a lavatory sink?

1 1/4"

400

When is a vacuum breaker required on a water heater?

When the water heater is located above the fixture outlet

400

When a water line crosses a clay sewer pipe underground, what is the minimum vertical and horizontal distance required?

12

400

A domestic dishwasher drain shall first connect to a _____.

Air Gap

500

What is the maximum trap arm length for 1 1/4" pipe?

2 1/2 feet or 30"

500

How many fixture can a 1 1/4" vent pipe convey?

1 fixture unit

500

What is the minimum trap size for a emergency floor drain?

2"

500
What is the minimum first hour rating of a tank type water heater for a 2 bedroom and 2 bathroom home?

First hour rating of 54 gallons

500
If the first hose bibb is 2.5 fixture units, what is the second hose bibb fixture unit valve on the same system?

1

500

The required clearance in front a 3" cleanout is ______ inches.

24"