Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman Sizing DWV Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman 4bc Drain, Waste, Vent Chapter 2,5,6 Appendix C (Wentz) and  8.3 - 8.5 (Toa)   

Design Guidelines VENTS Above ground venting cannot be less than 1 ¼” 1 ¼” vent can handle on 1 DFU Underground venting cannot be less than 2” in diameter Vents must be a certain distance from the trap that it serves An individual vent must not be less than ½ the size of the drain that it connects An individual vent should not be larger than the drain that it connects Downstream piping always bigger than the upstream section A vent line must be 6” above flood level rim of the fixture before turning horizontal Branch vents must slope toward a drain Some codes require that at least one of the building’s VTR be 4” in diameter or larger DRAIN/WASTE All traps must be vented The waste stack cannot be smaller the the largest horizontal branch connecting to the stack At least one waste stack same as building drain No branch pipe smaller than the one that proceeds it Above ground cannot be less that 1¼” Below ground cannot be less than 2” 1 ¼” drain pipe can handle on 1 DFU A drain line cannot be smaller than the trap arm to which it is connected Use 4” trap arm for floor mounted water closets

Sizing Drain Waste Determine number of plumbing fixtures to install Layout fixtures in space to codes (ie ADA) Determine site utilities Generate isometric Determine minimum trap size for each fixture (tbl 2-2) Determine DFU Add DFU values starting from the farthest end of system

Drain/Waste Iso Determine DFU… TDL 60o 90o 30o From Tbl 2-2 GIVEN: Water Closet – Siphon jet w/ flushometer valve, pressure = 15 psi Wall Urinal – Siphon jet with ¾” spud/flushometer Lavatory TDL = 100’ Determine DFU… From Tbl 2-2

Determine Trap Size for Drains From Table 2-2: Water Closet = 3” Wall Urinal = 2” Lavatory = 1 ¼”

Add DFU Water Closet = 6 DFU Wall Urinal = 4 DFU Lavatory = 1 DFU

Size Waste Branches

Sizing Waste (cont.)

Sizing Vents

Complete DWV Isometric

Sizing Circuit or Loop Vents

Next Time Test Review In class homework assignment Review notes and reading Able to use books/notes Due 10 minutes before end of class We will grade and review assignment Next week – Start HVAC

GIVEN: Water Closet – Siphon jet w/ flushometer valve, pressure = 15 psi Wall Urinal – Siphon jet with ¾” spud/flushometer Lavatory TDL = 100’