COSC 325 HOUSTON (PLUMBING) (Latest
Update ) Questions & Answers
{Grade A} 100% Correct
What is the minimum diameter of building sewer? - correct answer 4"
What is the general slope for a vent? - correct answer 1/8" per foot
Grade/Pitch/Slope for drainage pipe - correct answer Min of 1/4" per foot, Max of 3"
per foot. Underground sewer sometimes not as steep
Purpose of a cleanout - correct answer allow access to the piping to remove
stoppages and clean the interior
Where should Cleanouts be installed? - correct answer Front main: at the outside wall
of the building at the connection of building sewer and drain
,Stack base: at the base of all vertical soil or waste stacks
All 90 degree changes in direction
Every 50' on 3" and smaller horizontal drainage pipe; every 100' on 4" and larger
horizontal and drainage pipe
Stack Vent - correct answer The extension of a soil or waste stack above the highest
horizontal drain connected to the stack.
Relief vent - correct answer A vent with a function to provide circulation if air between
drainage and vent system.
How far should a vent terminal be located from openings? - correct answer 10'
, Yoke vent - correct answer A pipe connecting upward from a soil or waste stack to a
vent stack for the purpose of preventing pressure changes in the stack
Individual vent - correct answer A pipe installed to vent, a fixture trap and w/c
connects with the vent system above the fixture served or terminates in the open air
Common Vent - correct answer A single vent that ventilates multiple traps in the case
of a back to back vent.
Why must horizontal vents be sloped? - correct answer so water cannot accumulate
Main Vent (Vent Stack) - correct answer A vertical vent pipe that provides air
circulation to/from any part of a drainage system. Branches connect here.
Update ) Questions & Answers
{Grade A} 100% Correct
What is the minimum diameter of building sewer? - correct answer 4"
What is the general slope for a vent? - correct answer 1/8" per foot
Grade/Pitch/Slope for drainage pipe - correct answer Min of 1/4" per foot, Max of 3"
per foot. Underground sewer sometimes not as steep
Purpose of a cleanout - correct answer allow access to the piping to remove
stoppages and clean the interior
Where should Cleanouts be installed? - correct answer Front main: at the outside wall
of the building at the connection of building sewer and drain
,Stack base: at the base of all vertical soil or waste stacks
All 90 degree changes in direction
Every 50' on 3" and smaller horizontal drainage pipe; every 100' on 4" and larger
horizontal and drainage pipe
Stack Vent - correct answer The extension of a soil or waste stack above the highest
horizontal drain connected to the stack.
Relief vent - correct answer A vent with a function to provide circulation if air between
drainage and vent system.
How far should a vent terminal be located from openings? - correct answer 10'
, Yoke vent - correct answer A pipe connecting upward from a soil or waste stack to a
vent stack for the purpose of preventing pressure changes in the stack
Individual vent - correct answer A pipe installed to vent, a fixture trap and w/c
connects with the vent system above the fixture served or terminates in the open air
Common Vent - correct answer A single vent that ventilates multiple traps in the case
of a back to back vent.
Why must horizontal vents be sloped? - correct answer so water cannot accumulate
Main Vent (Vent Stack) - correct answer A vertical vent pipe that provides air
circulation to/from any part of a drainage system. Branches connect here.
