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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

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


Design guidelines

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


Sizing drain waste
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

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


Determine trap size for drains

1½”

1½”

2”

2”

4”

4”

Determine Trap Size for Drains

  • From Table 2-2:

  • Water Closet = 3”

  • Wall Urinal = 2”

  • Lavatory = 1 ¼”


Add dfu

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


Size waste branches

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


Sizing waste cont

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”)


Sizing vents

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??


Complete dwv isometric

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”



Next time
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’


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