Schier SI-75 User manual
Part #: 5045-002-01
Find these instructions online at: schierproducts.com/si-75
Contents
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Getting to Know the SI-75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
INSTALLATION GUIDE
SI-75 125 Gallon Billy Goat™Indoor/Outdoor Kitchen Solids Interceptor
913-951-3300 | schierproducts.com
© Copyright 2020 Schier, 06/23/2020
Schier | SI-75 Installation Guide
page 2 of 9
Install interceptor as close as possible
to fixtures being served
SPECIAL PRECAUTIONS
Do not install this unit in any manner
except as described in these instructions.
Doing so may result in property damage, personal injury or death.
DO NOT AIR TEST UNIT OR RISER SYSTEM!
For Schier Solids Interceptor Installations - Failure to follow this guidance
voids your warranty
Suspended Installations
Design trapeze to support the wet
weight of the unit. Do not partially
support unit or suspend unit using
metal U-channel to create a trapeze.
concrete floor
Support Inlet and Outlet Piping
For above grade installations ensure
heavy inlet and outlet piping (such as
cast iron or long runs) is properly
supported or suspended during the
entire installation process to prevent
connection failure or damage to
bulkhead fittings.
pipe supports
Provide at least 16"
clearance above unit for
routine maintenance.
16" min.
ODOR ALERT!
Interceptor is not a
sewer gas trap.
All upstream fixtures
must be trapped
ODOR ALERT!
Do not install air
gap on outlet side
of interceptor.
Installation Instructions
Installation instructions and additional
components are included with the
interceptor. Read all instructions prior to
installation. This interceptor is intended
to be installed by a licensed plumber in
conformance with all local codes.
High Temperature Kitchen Water
cold water supply line
high temperature
effluent ( > 150º F)
approved backflow
prevention assembly
DTV (drain water
tempering valve)
directly connected indirectly connected
If water is entering the interceptor at excessive temperature (over
150º F), a drain water tempering valve (DTV) and approved backflow
prevention assembly must be installed. Most state and local
plumbing codes prohibit water above 150º F being discharged into
the sanitary sewer. Water above 150º F will weaken or deform PVC
Schedule 40 pipe, poly drainage fixtures like interceptors and erode
the coating of cast iron (leading to eventual failure).
DO NOT USE CAST IRON
COVERS IN ABOVE GRADE OR
INDOOR INSTALLATIONS
Fully Support Base of Unit
Install unit on solid, level surface in
contact with the entire footprint of
unit base
page 3 of 9
Schier | SI-75 Installation Guide
Below Grade Installation Slab Requirements
A concrete slab to finished grade with rebar is required when installing
interceptor below grade.
Pedestrian Traffic or
Greenspace Areas Vehicular Traffic Areas
4" min.
slab 8" min.
slab
Hydrostatic/
Pressure Slabs
When installed under a
hydrostatic slab (slab
designed to withstand
upward lift, usually caused
by hydrostatic pressure)
interceptor must be
enclosed in a watertight
concrete vault.
concrete slab subject to hydrostatic pressure
watertight
concrete
vault
SPECIAL PRECAUTIONS
For Schier Solids Interceptor Installations - Failure to follow this guidance
voids your warranty
High Water Table
Installations
Interceptors and risers are not
designed to withstand water table
height in excess of the top of the
unit when buried (see figure). If it is
possible for this to occur, install the
interceptor and risers in a
water-tight concrete vault or
backfill with concrete or flowable fill
(wet concrete and flowable backfill
should be poured in stages to
avoid crushing the interceptor). At
risk areas include but are not limited to tidal surge areas, floodplains
and areas that receive storm water. Billy Goat™ models that are direct
buried in high water table scenarios must be installed with an anchor kit.
Model SI-75 uses model AK1 anchor kit.
DO NOT
COMPACT
BACKFILL
max water table height
for direct burial
model AK1
anchor kit
RebarRebar
Max Water Level
Risers are not designed
to retain water
Installations with Risers
Corrugated Riser Pipe
Requirements
Riser adapter model CA2 must be
used when installing interceptors
using 24" diameter corrugated
pipe as a riser. This will adequately
embed the cover adapter in the
concrete slab, preventing
cover/cover adapture failure
under traffic rated loads.
CA2
3 FCR2 Risers Max
94"
94"
94"
6 - 94"
6 - 94"
6 - 94"
GETTING TO KNOW THE GB-75
1. Pickable cast iron cover (standard)
2. Cover gasket
3. Safety Star
4. Safety Star tether
5. Cover adapter
6. Cover adapter gasket assembly
with upper and lower stainless
steel band clamps
7. 4" cleanout plug (x2)
8. Outlet bulkhead connection
(optional) 4" FPT (x2)
9. Bulkhead connection gasket
10. Bulkhead connection retaining nut
11. Inlet diffuser
12. Inlet diffuser retaining nut
13. Inlet bulkhead connection 4" FPT
14. 4" plain end fitting (x2)
15. Composite cover bolts
and washers (x4)
16. Bolted composite cover (optional)
17. Air relief/visual access
18. Outlet diffuser retaining nut
19. Outlet diffuser
20. Outlet bulkhead connection
(standard) 4" FPT
21. 7/16" nut driver bit
1 15
16
17
18
19
10
9
8
7
2
3
5
6
7
8
9
10
12
11
10
9
13
14
21
4
10
14
9
20
Schier | SI-75 Installation Guide
page 4 of 9
page 5 of 9
Schier | SI-75 Installation Guide
1Test tank for water tightness
1a 1b
1c
Have a Leak?
Call customer care at 913-951-3300
Hours 8am-5pm CST, M-F
Cap all connection points with 4" cleanout
plugs using pipe thread sealant or tape
approved for use with plastics.
Remove cover. For base unit testing fill with water to
just above the highest connection.
Inspect unit, connections and gaskets for leaks. Check
water level at specific time intervals per local code.
Fill Line
Excavate hole at least 12" larger than interceptor on all sides and 6" deeper than tank bottom. Lay a level bed of
well-packed, crushed aggregate (approximately 3/4" size rock or sand, with no fines) in the base of hole.
12" 12"
6" 6" or more
2 Excavate Burial Pit
Schier | SI-75 Installation Guide
page 6 of 9
3 Set Up Outlet Diffuser and Install Cleanout Plugs
Screw in provided 4" cleanout plugs using pipe thread
sealant or tape approved for use with plastics. Do not cap
the inlet or outlet connections attached to the diffusers.
3a Choose outlet location.
3c Cap unused connections(all configurations)
Side Outlet:
Go to Step 3b.
Straight
Through:
Go to Step 3c.
3b Reposition outlet diffuser (side outlets only)
Remove safety star insert, leave tethered to unit. Unscrew diffuser retaining nut and remove outlet diffuser.
Rotate diffuser toward chosen outlet, insert into chosen outlet and hand tighten retaining nut.
page 7 of 9
Schier | SI-75 Installation Guide
4a Install plain end fittings
4b Connect interceptor to drain lines
4 Connect Piping
4" Plain End
Screw plain end fittings (included) into bulkhead fittings using pipe thread sealant or tape
approved for use with plastics. 6" connection types come pre-installed from the factory.
Place unit into final position and set level. Mechanically couple inlet and outlet drainage lines to
unit. Do not solvent weld. Ensure all upstream fixtures are trapped. Vent per local code. Installation
of 2-way cleanout tees to grade (by others) is recommended for buried installations.
Outlet
2-way
cleanout tee
Inlet
BURIED INSTALLATION
Kitchen floor
Add this vent if unit is installed
one or more floors below the
fixtures being served
Vent per local code
FLOOR BELOW INSTALLATION
COUPLING DETAIL
Drain
line
Flexible coupling
Plain end fitting
Bulkhead fitting
4" FPT
4" FPT
4" FPT
5 Wet or Air Test Piping Per Local Code
Doing so may result in property damage, personal injury or death.
DO NOT AIR TEST UNIT OR RISER SYSTEM! Have a Leak? Call customer
care at 913-951-3300
Hours 8am-5pm CST, M-F
Schier | SI-75 Installation Guide
page 8 of 9
6 Bring Covers Flush-to-Grade
The SI-75 is ready for burial depth of 40" from finished grade to bottom of tank (or 13-1/2" to centerline of inlet).
Deeper burials will require extending the cover adapters and possibly adding risers.
Measure dimension X to determine riser height needed.
6a
See instructions included with FCR2.
Riser Height Risers
Needed Required
0" - 4" None (use adapter)
>4" - 34" FCR2 (x1)
>34" - 64" FCR2 (x2)
>64" - 94" FCR2 (x3)
Loosen the cover adapter upper band
clamp using 7/16" Nut Driver Bit. Adjust
cover adapter heights as needed.
Maintain a minimum 2-1/2" insertion
depth. Tighten upper band clamp to 5
-8 ft. lbs. of torque using 7/16" nut driver
Bit. If required, cover adapters may now
be tilted up to 10º in any direction using
gasket flexibility.
6c Make final cover adapter adjustments
6b Install risers if required
COVER ADAPTER ADJUSTMENT DETAIL
2-1
/
2" minimum
Cover
Safety Star
access restrictor
Cover adapter
Gasket
Upper band clamp
Lower band clamp
Interceptor accessway
page 9 of 9
Schier | SI-75 Installation Guide
DO NOT COMPACT BACKFILL
7 Install Anti-Flotation Anchor Kit
8 Backfill and Finished Grade
Fill unit with water for stabilization and float-out prevention. Backfill evenly around tank using crushed aggregate
(approximately 3/4" size rock or sand with no fines)or flowable fill. Do not compact backfill around unit.
8a Backfill
If the installation location is in a
high water table or at risk area
(including but not limited to tidal
surge areas, floodplains and areas
that receive storm water) the SI-75
must be installed with Schier
model AK1 anchor kit.
Max water table height for direct burial
Model AK1 anchor kit
Vehicular Traffic Areas:
Minimum 8" thick concrete slab with rebar required. Thickness of concrete around covers to be
determined by specifying engineer. If traffic loading is required the concrete slab dimensions
shown are for guideline purposes only. Concrete to be 28 day compressive strength to 4,000 PSI.
Use No. 4 rebar (ø 1/2") grade 60 steel per ASTM A615: connected with tie wire. Rebar to be 2-1/2"
from edge of concrete and spaced in a 12" grid with 4" spacing around access openings.
Pedestrian Traffic or Greenspace Areas:
Minimum 4" thick concrete slab with rebar required.
TOP VIEW 18"
min
45º
18"
min
18"
min
18"
min
Concrete slab
Rebar
8b Pour concrete slab to finished grade
Rebar
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