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All branch piping sizes and loads
should be in accordance with
Chart 2. Branch
piping should have a minimum of 1/8" per foot pitch. |
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The ProVent Base Fitting has
a pressure relief vent opening that extends up then returns
down 180 degrees using pipe and fittings that connect to the
horizontal building drain at a point no less than 10 pipe
diameters downstream from the center line of the vertical
stack to the centerline of the branch wye. The pressure
relief vent line may run parallel to the horizontal drain
and must connect above the centerline of the drain. Branch
soil or wastes are allowed when they are connected above the
horizontal drain line. They cannot connect in-between any
short pipe areas where there is a change in direction from
the Base Fitting downstream to the building drain. |
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The ProVent Base Fitting has
a pressure relief vent opening that extends up then returns
down 180 degrees using pipe and fittings that connect to the
horizontal building drain at a point no less than 10 pipe
diameters downstream from the center line of the vertical
stack to the centerline of the branch wye. The pressure
relief vent line may run parallel to the horizontal drain
and must connect above the centerline of the drain. Branch
soil or wastes are allowed when they are connected above the
horizontal drain line. They cannot connect in-between any
short pipe areas where there is a change in direction from
the Base Fitting downstream to the building drain. |
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The ProVent Base Fitting has
a pressure relief vent opening that extends up then returns
down 180 degrees using pipe and fittings that connect to the
horizontal building drain at a point no less than 10 pipe
diameters downstream from the center line of the vertical
stack to the centerline of the branch wye. The pressure
relief vent line may run parallel to the horizontal drain
and must connect above the centerline of the drain. Branch
soil or wastes are allowed when they are connected above the
horizontal drain line. They cannot connect in-between any
short pipe areas where there is a change in direction from
the Base Fitting downstream to the building drain. |
Branches that change directions three
(3) times by 90 degrees should increase one pipe size at the offset
nearest the stack. This increase does not apply if one (1) of the
changes can be made with two (2) forty five degree fittings or a
short sweep 90 degree fitting. |
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If two (2) 3.5 gpf public water
closets are connected to the same branch, the first connection can
be 3" then increased to 4" at the second connection. This increase
is not required for the 1.6 gpf flush water closets. Check
manufacturers installation instructions for pressure assisted type
water closets that may require special fittings for back to back
installations. |
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4" Size branches shall not exceed a
developed length of 27 feet. 3" Size branches shall not exceed a
developed length of 15 feet. 2" Size branches shall not exceed a
developed length of 15 feet. 2" branches for washing machines
should not exceed 5 feet. These lengths include any horizontal
pipe offsets but the length of the vertical drop arms is not
included. Horizontal to horizontal branch connections should be
made with wye combinations or heel outlet fittings. |
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Vertical branches should not exceed
40". A 45 degree offset can extend the drop pipe to 40" from the
top 45 degree fitting to the fixture outlet. When a vertical drop
into a horizontal waste exceeds 10 feet both must increase one (1)
pipe size. |
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1-¼" size fixture traps can be
connected back to back into one 2" vertical drop. 1-½" size fixture
traps require separate 2" drops. 1-1/2" and larger traps can use a
single vertical drop by increasing the drop one (1) pipe size.
Note: Horizontal waste branches without vertical drops are sized per
chart 2. |
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An alternate to increase developed lengths can be
done by using a revent line or by telescoping smaller to larger pipe
sizes or by using an Air Admittance Valve where applicable and
permitted. The revent line shall be routed vertically and
horizontally and tie in above the flood rim level using a wye branch
looking up. |
