35
Table
3
‐
6.2:
Vertical
drain
piping
diameters
PVC
piping
Nominal
diameter
(mm)
Capacity
(L/h)
Remarks
PVC25
25
220
Branch
piping
only
PVC32
32
410
PVC40
40
730
Branch
or
main
piping
PVC50
50
1440
PVC63
63
2760
PVC75
75
5710
PVC90
90
8280
6.4
Drain
Piping
for
Units
with
Lift
Pumps
Drain
piping
for
units
with
lift
pumps
should
take
account
of
the
following
additional
considerations:
A
downward
sloping
section
should
immediately
follow
the
vertically
rising
section
adjacent
to
the
unit,
otherwise
a
water
pump
error
will
occur.
Refer
to
Figure
3
‐
6.7.
Air
vents
should
not
be
installed
on
vertically
rising
sections
of
drain
piping,
otherwise
water
may
be
discharged
through
the
air
vent
or
water
flow
may
be
impeded.
Figure
3
‐
6.7:
Downward
sloping
section
of
drain
piping
6.5
Drain
Piping
Installation