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Sizing DWV

4bc. Drain, Waste, Vent. Chapter 2,5,6 Appendix C (Wentz) and  8.3 - 8.5 (Toa)   . Sizing DWV. Plumbing Systems CNST 305 Environmental Systems 1 Dr. Berryman. DRAIN/WASTE All traps must be vented The waste stack cannot be smaller the the largest horizontal branch connecting to the stack

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Sizing DWV

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

  2. 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 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 Design Guidelines

  3. 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

  4. TDL 60o 90o 30o Determine DFU… From Tbl 2-2 Drain/Waste Iso • GIVEN: • Water Closet – Siphon jet w/ flushometer valve, pressure = 15 psi • Wall Urinal – Siphon jet with ¾” spud/flushometer • Lavatory • TDL = 100’ • Water Closet = 6 DFU • Wall Urinal = 4 DFU • Lavatory = 1 DFU

  5. 1½” 1½” 2” 2” 4” 4” Determine Trap Size for Drains • From Table 2-2: • Water Closet = 3” • Wall Urinal = 2” • Lavatory = 1 ¼”

  6. 2 DFU 4 DFU 8 DFU 12 DFU 18 DFU 24 DFU Add DFU • Water Closet = 6 DFU • Wall Urinal = 4 DFU • Lavatory = 1 DFU

  7. 2 DFU = 1 ½” 4 DFU = 2” 8 DFU = 2 ½” 12 DFU = 2 ½” could be 3” 18 DFU = 4” Could be 3”: Depends on code and load…see note “b” 24 DFU = 4” Size Waste Branches

  8. 1½” 1½” 2” 2” 4” 4” Sizing Waste (cont.) 2 WSFU (1 ½”) 4 WSFU (2”) 8 WSFU (2 ½”) 12 WSFU (3”) 18 WSFU (4”) 24 WSFU (4”)

  9. Size Lavatory Chart reads 1¼”, however this size pipe handles only 1 DFU Size Urinals Chart reads 1¼”, however this size pipe handles only 1 DFU Sizing Vents Use 1 ½” Use 1 ½” Size WC Use 2” Size stack to VTR Use 2” VTR SIZE??

  10. 1½” 1½” 2” 2 WSFU (1 ½”) 2” 4 WSFU (2”) 8 WSFU (2 ½”) 4” 12 WSFU (3”) 4” 18 WSFU (4”) 24 WSFU (4”) Complete DWV Isometric 4” 1 ½” 1 ½” 1 ½” 2” 1 ½” 2” 2”

  11. Sizing Circuit or Loop Vents Use TDL

  12. 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

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

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