Schier GGI-750 User manual

Contents
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Installation Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Document #: 057-0880-04
Find these instructions online at: schierproducts.com/ggi-750
INSTALLATION GUIDE
GGI-750 750 Gallon Gravity Grease Interceptor for Indoor/Outdoor Use

Page 2 of 6
GGI-750 Installation Guide
When Installing Interceptor Inside
Fernco or similar
rubber flow
restriction end cap
SPECIAL PRECAUTIONS
Installation Instructions
Hydrostatic Slabs (or Pressure Slabs)
High Temperature Kitchen Water
concrete slab subject to hydrostatic pressure
watertight
concrete
vault
InterceptorInterceptor
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.
installation
instructions
DO NOT AIR TEST UNIT OR RISER SYSTEM!
For Schier Grease Interceptor Installations - Failure to follow this guidance
voids your warranty
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).
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.
If your dishwashing sink(s)
discharges into a floor
drain/sink (drain), you
must regulate the flow into
the drain to avoid an
overflow of water onto the
kitchen floor. This can be
done by installing a valve
or flow restriction cap on
the sink piping that
discharges into the drain.
See drawing for guidance. For detailed guidance on indirect
connections, go to:
webtools.schierproducts.com/Technical_Data/Indirect_Connections.pdf
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.

SPECIAL PRECAUTIONS
AGS2
The wet weight of the interceptor combined
with high temperature kitchen water
creates the potential for tank deformation
when installed above grade. Model GB-500
installed above grade must be installed
with Above Grade Support Kit model AGS2
to maintain structural integrity
Above Grade Installation Support
(for Model GB-500 Only)
Install unit on solid, level surface in
contact with the entire footprint of
unit base; for 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.
Fully Support Base of Unit
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.
Support Inlet and Outlet Piping
pipe supports
InterceptorInterceptor
concrete floor
suspended installation
InterceptorInterceptor
DO NOT
COMPACT
BACKFILL
Page 3 of 6
GGI-750 Installation Guide
For Schier Grease 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. Great Basin™ models that
are direct buried in high water table
scenarios must be installed with an anchor kit. Models GB-50, GB-75,
and GB-250 use model AK1 anchor kit. Model GB-500 uses model AK2
anchor kit for use with deadmen anchors. Models GB-1000, GGI-750 and
GGI-1500 use model AK3 anchor kit for use with deadmen anchors.
max water table height
for direct burial
deadman anchor
polyester strap
turnbuckle
InterceptorInterceptor

Finished grade
Recommended 2-Way
cleanout tee to grade
(by others)
Polyester Strapping
Turnbuckles
Optional deadman anchor
Risers to
Grade
SIDE VIEW DETAIL
Native soil
Backfill
Well packed base
Concrete slab
Finished grade
Adapter
Riser
EXCAVATION AND BACKFILL DETAIL
Optional
deadmen anchor
Turnbuckle
INSTALLATION
Page 4 of 6
GGI-750 Installation Guide
1 Leak/Seal Testing
Cap/plug all base unit plumbing connections and remove
covers. For base unit testing,fill with water to just above the
highest connection. For riser system testing (if required) fill with
water to finished grade level. CAUTION: Risers must be
supported before filling with water to prevent tipping. Inspect
unit, connections and all gaskets and clamps (if applicable) for
leaks. Check water level at specific time intervals per local code.
NOTE: All GGI series tanks have been wet tested for leaks prior
to shipment from the factory.
1. Lower and center the unit into hole using straps around unit. Do
not use chains or accessways to move the unit. Ensure the unit
tops are level with finished grade.
2. 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.
3 Set Unit and
Connect Piping
2 Excavation
1. Install unit as close as possible to fixtures being servedl.
2. Surrounding soil must be undisturbed soil or well compacted
engineering fill.
3. Width and length of excavation shall be a minimum of 18"
greater than the tank on all sides and depth shall be 12" deeper
than tank bottom.
4. Set the tank level on a 12" deep layer of well-packed crushed
aggregate material.

4 Bring Covers Flush-to-Grade
The GGI-750 is ready for burial depth of 76-1/2" from finished grade to bottom of tank (or 19-1/2" to centerline of inlet).
Deeper burials will require extending the Cover Adapters and possibly adding risers.
Measure dimension X to determine riser height needed.
4a
Install risers if required
(see instructions included with FCR2).
4b
Riser Height Risers
Needed Required
0" - 4" None (use adapter)
>4" - 34" FCR2 (x2)
>34" - 64" FCR2 (x4)
>64" - 94" FCR2 (x6)
If required, Cover Adapters
may now be tilted up to
10º in any direction using
gasket flexibility.
5f
Adjust Cover Adapter
heights as needed.
Maintain a minimum
2-1/2" insertion depth.
2-1
/
2" minimum
4d
Loosen the
Cover Adapter Upper
Band Clamp using 7/16"
Nut Driver Bit.
4c
Tighten Upper
Band Clamp to 5 -8 ft.
lbs. of torque using 7/16"
Nut Driver Bit.
4e
Finished grade 4"
8" (Vehicular trac)
TOP VIEW
ELEVATION VIEW
18" min
45º
18" min
Rebar
Rebar
Concrete Slab
4" Thick for pedestrian
8" Thick for vehicular
CONCRETE SLAB DETAIL
18"
min 18" min
BACKFILL
1. Preparation of sub grade per geotech recommendations.
2. Stabilize and compact sub grade to 95% proctor.
3. Fill unit with water before backfilling to stabilize unit and prevent
float-out during backfilling. Secure covers and risers (if necessary)
to the unit. For units with cast iron covers, remove retainer clips
prior to burial.
4. 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.
FINISHED CONCRETE SLAB
Slab must extend 18" minimum outside the footprint of the unit.
Pedestrian traffic or greenspace areas: 4" Thick reinforced
concrete slab required.
Vehicular traffic areas: Minimum 8" Thick concrete slab with rebar
required. Thickness of concrete around cover 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.
5 Backfill and Finished Grade
INSTALLATION
Page 5 of 6
GGI-750 Installation Guide

Page 6 of 6
GGI-750 Installation Guide
deadmen anchors (by others)
INSTALLATION OPTIONS
1 High Water Table Installations, See Anchor Kit Model AK3
Deadmen Anchoring:
If the installation location is in a high
water table area or at risk are (including
but not limited to tidal surge areas,
floodplains and areas that receive storm
water) the GGI-750 must be secured to
concrete deadmen anchors (by others)
using Schier model AK3 anchor kit.