Module 060201 Flashcards
A vent pipe that is used in conjunction with a circuit vent to provide additional air circulation between a drainage system is called _____________
relief vent
A circuit vented branch is defined as the drainage piping between the _________________
relief vent and the circuit vent
A circuit vent connects to __________________
the trap arm of the most upstream fixture
What is the maximum number of water closets that may drain into a circuit vented branch?
there is no maximum
Where are circuit vented systems allowed to be installed?
- residential applications
- commercial buildings
- high rise apartment buildings
How are wet venting and circuit venting systems similar?
Both systems use the upper portion of a horizontal drainage pipe for venting multiple fixtures
Is it permissible to drain 1 1/2” trap arms into a circuit vented branch that also serves 2” trap arms?
Yes, but only if the 1 1/2” trap arms are separately vented
What is the maximum hydraulic load permitted to drain into a relief vent?
6 Fixture units
What is the maximum hydraulic load permitted to drain into a circuit vent?
3 Fixture units
What is the minimum size permitted for a circuit vented branch that serves 2” trap arms?
3”
What is the minimum size permitted for a circuit vented branch that serves only 1 1/4” trap arms?
2”
Which table in the National Plumbing code is used to size a circuit vented branch?
Table 2.4.10.6 B
What is the minimum size of a relief vent for a circuit vented branch that serves water closets?
1 1/2”
What is the minimum size of the wet portion of a circuit vent that has one lavatory draining into it, if the circuit vented branch serves water closets?
2”
Which table in the National Plumbing Code is used to size circuit vents?
Table 2.5.8.3
