Transcript Slide 1

Environmental Controls I/IG
Lecture 8
Waste & Vent Systems
Waste & Vent Sizing Procedure
Bathroom Design
Waste & Vent Systems
Fundamentals
Siphon action
can drain water
Trap blocks
sewer gas
Vent breaks
siphon
S: p. 988, F.22.8
Air Gaps
Eliminate the potential for cross contamination
S: p. 991, F.22.11
Vents and Stacks
Individual vents
Circuit vents
Soil stack
Vent stack
Stack vent
“Wet stack”
Vent through
roof (VTR)
S: p. 990, F.22.10
Note: Drain fittings are 45º
Drains & Sewers
House drain
House sewer
Storm drain
Clean outs
House traps
Fresh air inlet
S: p. 989, F.22.9
Note: Drain fittings are 45º
Waste & Vent Sizing Procedure
1. Identify waste & soil locations
Clusters are more
efficient
S: p. 995, F.22.17
2. Layout system
vertically & horizontally
Grouped fixtures can
be stacked in a
vertical riser
S: p. 1009, F.22.31
3. Size Traps
Trap size is used
when connecting
to main
S: p. 998, T.22.2
4. Calculate
Drainage Fixture
Units (DFU)
Pipe sizes based
on DFU
S: p. 998, T.22.2
5. Determine loads
Fixture location
may control size
S: p. 1003,
F.22.24
6. Determine slope and size of
horizontal drains
Slope may be
constrained by
depth of floor
cavity
S: p. 1001, T.22.5
7. Verify maximum vent length
Measured from
plans
S: p. 1003,
F.22.24
8. Size vents according to
DFU and length
Calculate for each
vent load and
developed length
S: p. 1000, T.22.4
9. Verify space requirements and
adjust design
Common adjustments
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“Wet” walls  6” cavity
Slope and ceiling exposure
Cleanout access
Bathroom Design
Design Considerations
ADA compliance
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ANSI Standard A117.1 1986
Wheel chair access
Grab bars
Counter top/fixture heights
Visual privacy
Acoustical privacy