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The stack must be sized by the total
number of fixture units (D.F.U.) discharging into it.
Chart 1
provides the number of fixture units by individual fixture. The
sum of the fixture units for all fixtures discharging into the stack
equals the total fixture units.
Chart 3
provides the required stack size by
total fixture units. The stack size shall continue full size
through the roof. |
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A ProVent Stack Fitting is required
to be used at each floor level when the horizontal soil or waste
branch collected is either the same size or one pipe size smaller
than the vertical ProVent Stack Fitting. |
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If there are no branch connections at
a floor level, there is no need to use the ProVent Stack Fitting.
Instead, a double in-line offset must be used in its place. The
vertical interval between the Stack Fitting and the in-line offset
shall not exceed 20 feet and no more than two (2) consecutive double
in-line offsets can be used. |
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Waste branches that are two (2) pipe sizes smaller than the stack
can be connected with a sanitary tee or wye directly into the
ProVent stack. |
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Offsets in the stack of more than 60
degrees require a ProVent Base Fitting with a pressure relief vent
line tied in to the top vertical portion of the stack. Branch
piping can be connected to the offset soil piping. A 45 degree
stack offset is not considered an offset. Waste branches (1) one
pipe size smaller can be connected to the pressure relief vent line
with the exception of washing machine wastes. It is recommended
that Washing machine wastes should be isolated from other fixtures.
If they must be combined, call for technical support. |
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The building drain size is determined
by the total fixture unit load (Chart 4) from the combination of
stacks and other soil or waste branches that discharge into it
(Chart
1,
Chart 2
and
Chart 3). |
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Stacks may offset above the highest
fixture served. When the horizontal offset exceeds twenty (20) feet,
the diameter of the horizontal offset and the vent through the roof
must be increased one pipe size |
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Combinations of vent stacks may be
tied together above the highest fixture served before going through
the roof. The combined vertical stack must be increased (1) one
pipe size larger than the combined stacks. If the distance between
the two (2) stacks that connect is greater than twenty (20) feet,
the horizontal branch must be one (1) pipe size larger than the
downstream stack. |
