COSC 325 Houston (plumbing) Questions and Answers 2024
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Course
COSC 325 Houston
Institution
COSC 325 Houston
What is cpvc used for? - Answer- Typically used for HW and CW distribution, Fire sprinkler pipes, water distribution
What is PEX used for? - Answer- Water service piping, CW and HW systems, used commonly in residential
Hangers typically take up ___ of labor cost - Answer- 20%
DWV
Drain Wa...
COSC 325 Houston (plumbing) Questions and
Answers 2024
CPVC (chlorinated polyvinyl chloride) - Answer- hot and cold water supply, off white color
FDC - Answer- Fire Department Connection
Above ground pipe material - Answer- Metal
1 CFH (Cubic Feet per Hour) - Answer- 1000Btu/h
OSHA requirement for fall protection - Answer- 6 feet
OSHA requirement for trenching - Answer- 5 feet
Wall thickness terms for copper - Answer- Type L, K, M
DWV - Answer- abbreviation for drainage, waste, and vent. Found on "p" sheets
What are the four groups of plumbing pipe and fitting material? - Answer- Plastic, Copper, Cast Iron,
Steel
What is Expansion loop for? - Answer- In plastic, provides an area for tubing to expand
What plastic pipe is common for DWV? - Answer- Schedule 40 ABS
What is the max length of rigid plastic DWV pipe? - Answer- 35'
,What is ABS typically used for? - Answer- Sanitary drainage, vent, aboveground and underground storm
water drainage.
What is PVC used for? - Answer- Sanitary drainage, vent, aboveground and underground storm drainage,
water mains, and water service lines. COLD WATER ONLY
What is cpvc used for? - Answer- Typically used for HW and CW distribution, Fire sprinkler pipes, water
distribution
What is PEX used for? - Answer- Water service piping, CW and HW systems, used commonly in
residential
Hangers typically take up ___ of labor cost - Answer- 20%
DWV
Drain Waste Vent
SS
Sanitary Sewer
OSHA requires trenching protection at ___.
5 feet or greater
types of trenching protection:
- stepping/bencing
- trench box
- shoring
SS/SD materials:
- cast iron
- copper
- PVC
- ABS
What color is cast iron?
black
, How is cast iron pipe joined.
hub and no-hub joints
Cast iron is ___.
non-combustible
Cast iron is the ___ option for indoor plumbing.
quietest
Copper piping can be joined by ___, ___, or ___.
soldering, threaded joints, or compression joints
PVC is a ___ ___.
white plastic
PVC can be joined by:
slip and threaded joints
Copper piping is ___ option for plumbing.
most expensive
PVC is ___ and ___.
combustible and noisy
ABS is ___ ___.
black plastic
ABS can be joined by ___ and ___.
slip and threaded joints
ABS is ___ and ____.
combustible and noisy
What is typically installed after the building sewer exits the footprint of the building?
double cleanout
What should be installed on SD pipes inside the building?
insulation
If water is flowing from a cow tongue:
check the roof, primary drainage is probably clogged
What is used to size drainage pipes?
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