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2.4.2 Heavy Duty Installations
1.
Excavate area 60” wider and 12”
deeper than separator; this allows for a
full 12” concrete encasement
2.
Check level of unit and inverts of inlet/
outlet pipes
3.
Pour concrete to level of inlet/outlet pipes
4.
Connect inlet/outlet pipes - pipes
should be resistant to hydrocarbons.
Flexible couplings will be required as
inlet/outlet pipes are metric dimensions
5.
Inlet pipes should be installed with
as few bends and slopes as possible
to prevent blockages and reduce
turbulence of incoming wastewater
6.
Install extension shaft - cut to required
height, place seal in lowest notch of
remaining section. Grease seal and
tank collar with acid-free grease to
ensure watertight seal.
7.
Install wiring conduit for alarm system
(if used)
8.
Continue backfilling up to 8” (200mm)
below top of access shaft
9.
Install reinforcement, form and pour
concrete load distribution plate - 8”
thick and extending 14” around shaft in
all directions (see below for details)
10.
Install cover, frame and concrete
adaptor plate to ensure it is held
securely in place
11.
Install alarm sensors (if used)
2.4.1 Light Duty Installations
1.
Excavate area 60” wider and 12”
deeper than the separator; this allows
for a 12” aggregate base compacted
to Proctor density 97%.
2.
Check level of unit and inverts of inlet/
outlet pipes
3.
Backfill around unit to the level of
inlet/outlet pipes (backfill should be
2-16mm sand/gravel); take care when
compacting fill not to damage separator
4.
Connect inlet/outlet pipes - pipes
should be resistant to hydrocarbons.
Flexible couplings will be required as
inlet/outlet pipes are metric dimensions
5.
Inlet pipes should be installed with
as few bends and slopes as possible
to prevent blockages and reduce
turbulence of incoming wastewater
6.
Install extension shaft (if used) - cut to
required height, place seal in lowest
notch of remaining section. Grease seal
and tank collar with acid-free grease to
ensure watertight seal.
7.
Install wiring conduit for alarm system
(if used)
8.
Recheck levels
9.
Continue to backfill and compact
10.
Install cover with 4” deep concrete
collar to ensure it is held securely in
place
11.
Install alarm sensors (if used)
2.4 Installation
Load distribution plate Ø 61.0”/33.5”x8.0”
(1550/850x200mm)
Concrete: 5,000psi (35MPa)
Concrete Steel: #4 rebar (10M)
Concrete Cover: 1.2” (30mm)
35 x #4 rebar @ 3.15”
(10M @ 80mm)
stirrups
Typical reinforcement plan
Ø
61.0” (1,550mm)
Ø
33.5” (850mm)
8.0” (200mm)
13.75”
(350mm)
13.75”
(350mm)
6.0”
(150mm)
4.5”
(115mm)
Cross section