COSC 325 Houston (plumbing) sample questions and solutions |latest updates | GRADED A+

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 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 Steel piping - ANSWER Galvanised or black Wall thickness terms for plastic - ANSWER Schedule 20, 40, 80, Bigger number=thicker Wall thickness terms for Copper piping - ANSWER Type L, K, M. K is thickest, DWV is thinnest Wall thickness terms for galvanized steel - ANSWER Schedule 40, 80 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. Pressure reducing valve - ANSWER A valve which maintains uniform pressure on its outlet side regardless of its pressure fluctuations on the inlet side above the pressure level. Usually installed near meters Water Meter - ANSWER A device used to measure the amount of water that goes through the water service. (Cubic Feet or Gallons) DFU - ANSWER Drainage Fixture Unit. Measure of probable discharge of wastewater and waterborne waste into the drainage system formulated in tests. What is the minimum diameter of building sewer? - ANSWER 4" What is the general slope for a vent? - ANSWER 1/8" per foot Grade/Pitch/Slope for drainage pipe - ANSWER Min of 1/4" per foot, Max of 3" per foot. Underground sewer sometimes not as steep Purpose of a cleanout - ANSWER allow access to the piping to remove stoppages and clean the interior Where should Cleanouts be installed? - 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 - ANSWER The extension of a soil or waste stack above the highest horizontal drain connected to the stack. relief vent - 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? - ANSWER 10' Yoke vent - 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 - 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 - ANSWER A single vent that ventilates multiple traps in the case of a back to back vent.