COSC 325 Houston (plumbing) sample questions and
solutions |latest updates | GRADED A+
SS - ANSWER Sanitary Sewer
ABS - ANSWER Black plastic material
VTR - ANSWER vent through roof
Primary Purpose of roof vent - ANSWER Let air into system
What division is plumbing - ANSWER 22
Invert D...
Primary Purpose of roof vent - ANSWER Let air into system
What division is plumbing - ANSWER 22
Invert Depth - ANSWER elevation of the bottom inside of the pipe
DW - ANSWER Domestic Water
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%
What is Copper pipe used for? - ANSWER Water supply, fire suppression, HVAC. Fairly rare.
What is Cast-Iron no-hub and bell-and-spigot used for? - ANSWER aboveground and
underground sanitary drain, vent, and storm water drainage. Bell and spigot typically
underground
Fittings for plastic piping? - ANSWER Cement, caps, compression fittings
Fittings for Copper tubing? - ANSWER Solder joint fittings (Require fire watch), press fitting,
Rolled groove joint fitting, threaded
Fittings for Cast Iron - ANSWER Hub (Bell-and-Spigot) and no hub
Angle Valve - ANSWER Globe valve in which the inlet and outlet are at 90 degrees to each
other. less resistance to water flow and reduce number of joints required
Ball Valve - ANSWER Valve having a ball-shaped internal component with a hole through its
center that permits water to flow through when aligned with the waterway.
Butterfly Valve - ANSWER Control valve that uses a flat circular plate in a pipe that rotates 90
degrees across the cross section of the pipe to control the flow of water.
Check Valve - ANSWER A valve that allows flow in one direction but prevents flow in the
opposite direction.
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