Highland Tank
grease i
nterceptors
HT-2816
Passive
Grease
Interceptors
User’s Manual
Installation, Operation & Maintenance
Carefully read and follow the instructions in this manual.
Single, Double &
Triple-basin
Proudly made
in America
count on our products. trust in our people.
814.893.5701 | highlandtank.com
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Warning and Disclaimer
This manual is intended for use only by persons knowledgeable
and experienced in underground grease interceptor installation,
operation and maintenance. This manual provides general guidance, and
conditions at your site may render inapplicable some or all of the guidance. If
you are uncertain, or require clarication or further instruction, please contact Highland Tank prior to commencing any installation, operation or maintenance procedure. You are solely
responsible for compliance with all federal, state and local laws,
regulations and ordinances applicable to your installation and
operation. Highland Tank disclaims all liability related to any misuse of the
tank or failure to follow all guidance and instruction provided by Highland
Tank.
Contents
Installation 6
Piping & Venting 15
Start-up 20
Operation 21
Maintenance 24
PGI Reference Diagrams 27
Options and Accessories 29
Best Management Practices 30
Introduction
Appendices
Thank you for purchasing a Highland Tank Grease Interceptor the leading high-performance interceptor in the industry.
The purpose of this manual is to provide detailed information
on the installation, venting, startup, operation, inspection,
maintenance, trouble-shooting and best management practices for the
Highland Tank Passive Grease Interceptor.
These instructions should be used in conjunction with any
and all other applicable installation and corrosion protection
system instructions, e.g.:
• Highland Tank’s HighGuard Tank Installation Instructions,
HT-7001,
®
• Steel Tank Institute ACT-100-U
Installation Instructions,
R971.
Note: This manual is based on Highland Tank’s standard grease interceptor congurations. Other custom congurations are available.
Verify the supplied conguration prior to installation and testing.
Appendix A: Best Management Practices (print and post) 30
Appendix B: Aboveground Interceptor Installation 31
Forms
Glossary of Terms
Sample Inspection/Maintenance Log 33
Grease Hauler Manifest 35
No Grease sign (print and post near sinks and drains) 36
PGI - Passive Grease Interceptor
BMP - Best Management Practices
FOG - Fats, Oil & Grease
FSE - Food Service Establishment
AHJ - Authority Having Jurisdiction
www.highlandtank.com • 3
Standard PGI
Description
The Highland Tank PGI is designed specically for the separation of
fats, oils, grease and settleable solids from commercial and industrial food service facilities. The PGI intercepts and collects these pollutants from the facility’s waste stream and prevents their discharge
into the environment.
The PGI is a stationary, wastewater treatment tank lled with water.
Internal bafes and weirs diffuse ow and create an extended path
for FOG to contact static water in the tank. Initial solids separation
and knockout occur in the rst chamber and are retained by means
of a sludge bafe. Sizing of a PGI is based on the GPM ow to unit.
PGIs retain waste stream inuent long enough to allow FOG to
separate from waste stream and rise to surface. Retained FOG
cools, solidies and remains in the PGI until removal.
Important points to consider prior to installation, operation and maintenance of the PGI:
Carefully read and follow instructions in this manual. Local codes and ordinances may apply.
Check with local AHJ prior to installation of PGI.
• Ensure adequate site space - almost all products are delivered on a 75-foot-long
tractor trailer. Allow space for unloading, positioning and temporary storage if
applicable.
• Ensure the crane has adequate lifting capacity and clearance - have operator check
site for clearances (overhead, turning, etc.). Spreader bars may be required for 10
foot diameter and larger PGIs.
• PGIs that are 0 foot diameter and larger are typically shipped rotated to minimize
over-the-road height. They must be lifted from the hauling trailer by the supplied
lifting lugs on the heads of the PGI. They must then be rotated before nal lifting
into the excavation. Spreader bars and/or adequate lifting straps must be available
to maintain recommended safe lifting capacity. Please check approval drawing for
overall length of the PGI and location of the head lifting lugs.
• Do NOT rotate the PGIs while they are still on the trailer - damage may result. PGIs
must be lifted from the trailer, using the lifting lugs supplied on the heads, and
lowered onto a at area, free from anything that may cause damage to the exterior
coating. Once the PGI is stable, the lifting device may need to be repositioned and
then reattached to the lifting lugs on the top centerline of PGI. At this point, slowly
roll the PGI to upright position on the ground before lifting to place in nal resting
position.
• Special permits may be required for weight, size, etc. by local code or ordinance.
• Conrm inlet/outlet piping elevations - coordinate with site plan - check/recheck
approval drawing when PGI arrives.
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Important points to consider (continued):
• Make sure PGI hold-down method/system is predetermined and components are at
the site prior to PGI installation.
• Never enter the PGI or any of its enclosed spaces without proper conned space
entry training and approved equipment. See OSHA, Regulations for Permit-Required
Conned Spaces - 29 C.F.R. § 1910.146.
• Barricade the PGI installation area until job is complete.
• The PGI will not remove chemical or physical emulsions, dissolved hydrocarbons,
solvents or Volatile Organic Compounds. Avoid introducing such materials into the
PGI.
• Waste oils, such as frying oil, should not be intentionally drained into the PGI.
Filling the PGI with waste oils adversely affects PGI performance. Waste oil should
be properly disposed of by other means.
• The PGI needs to be maintained to remain as free of accumulated FOG and solids as
possible. Suction removal of waste as needed, is the best and recommended
method of maintenance.
• The location of your PGI should be as close as possible to the source of the FOG to
minimize solidication in the piping system. PGI must also be placed in an area with
sufcient truck access (top-side clearance) for waste removal.
• An absence of gravity ow to the PGI will necessitate wastewater pumping. Pumping
should be restricted to the clean water, efuent end of the PGI. If pumping occurs at
the inuent end, it will mix the grease and water, increasing the emulsied and
dissolved grease content and possibly causing PGI failure. If a pump is installed
upstream of the PGI, it must be a positive displacement pump (e.g. progressive
cavity, diaphragm, sliding shoe), set at minimum ow rate and installed as far
upstream as possible to minimize grease/water mixing.
• Piping should be designed to minimize turbulence and promote laminar ow.
• The PGI must be kept from freezing at all times. The PGI and piping should be
installed below local frost levels. If necessary, a thermostatically controlled steam
or electric heating device may be installed.
• Fill the PGI with clean, fresh water before introducing any wastewater. Complete the
PGI Installation Checklist and Start-up Report (Form # HT-9049). A copy of the
completed form should be retained by the PGI owner and installation contractor.
®
• Complete the HighGuard or ACT-100-U
Installer Information Card that was included
with the delivery documents. This information is required to activate and maintain
the Limited Warranty.
www.highlandtank.com • 5
Installation
Care in Handling PGIs
PGIs must not be dropped, dragged or handled with sharp objects
and, except as minimally necessary for inspection and testing,
should not be rolled. Lifting equipment must be of adequate size to
lift and lower the PGI without dragging, dropping or damaging the
PGI or its coating.
PGI Unloading
Lifting and Moving
WARNING:
Under no circumstance
should chains or slings be
used around
the PGI shell.
The PGI must be mechanically unloaded. Use extreme care when
unloading as weight distribution of PGI may be uneven.
Lifting and moving the PGI must only to be done using the lifting
lugs welded to the PGI. PGIs should be carefully lifted, moved and
lowered using cables, chains or straps of adequate size. When two
lifting lugs are used, the angle between the lifting cable and vertical
shall be no more than 30 degrees. See Fig.1. Use a spreader bar
where necessary. Maneuver PGIs with guidelines attached to each
end of the PGI. If PGIs must be relocated on a job site during
installation, they must be lifted and not rolled.
Fig. 1
Max. 30º
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Max. 30º
Highland Tank
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Installation & Maintenance Instructions are available at www.highlandtank.com
Highland Tank
www.highlandtank.com
Installation & Maintenance Instructions are available at www.highlandtank.com
®
HTM-0001
Use spreader bar
when necessary
®
HTM-0001
Pre-Installation
Inspection & Testing
Upon delivery, visually inspect the PGI for exterior damage that may
have occurred during shipping or job site handling. Any damage that
could result in leakage or corrosion must be repaired in a manner
approved by Highland Tank. Please refer to coating repair instructions below. If a PGI is not buried within 90 days, the PGI should be
covered to protect the exterior coating from the effects of ultraviolet
light damage.
If the PGI is of double-wall construction and has shipped with a
vacuum drawn on the interstice, inspect the vacuum gauge. If the
gauge indicates less than 5 inches, reinstitute the vacuum to 7
inches. Maintain 5 inches of vacuum for 2 hours before installing the
PGI. Do not relieve pressure until PGI is secured in its nal resting
position.
Coating Repair
Before placing the PGI in the excavation, all dirt clods and foreign
matter shall be cleaned from the surface of the PGI. Damage to
coating surface must be repaired using the supplied touch-up kit.
Visually inspect the PGI for damage. Pay particular attention to areas
where coating may have been gouged or abraded. Mark all areas
which appear damaged for repair.
Clean damaged PGI coating areas of rust, contaminants or
disbonded coating prior to application of touch-up coating.
Areas of coating damage shall be roughened up with coarse grit
sandpaper or grinder (see Society of Protective Coatings (SSPC)
SP-2 “Hand Tool Cleaning” or SP-3 “Power Tool Cleaning” for additional guidance) to remove all glossiness from the surface surrounding the repair area approximately 6 inches around the damaged
area. Re-coat the area with touch-up coating provided. See Fig. 2.
Allow the repaired coating areas to cure completely.
Damaged polyurethane coatings must be repaired with the
polyurethane repair kit that was delivered with the PGI.
Internal Piping
Inspection
WARNING:
Carefully remove manway covers so as not to damage the gaskets.
Inspect the interior of the PGI from above (without entry) to ensure
that internal piping is secure and has not been damaged during
transport. Do not allow anyone to enter the PGI unless it has been
properly prepared for entry and the person entering the PGI has
been properly trained for conned-space entry per OSHA, Regulations for
Permit-Required Conned Spaces - 29 C.F.R. § 1910.146.
DO NOT ENTER the PGI without following proper conned space
entry procedures.
www.highlandtank.com • 7
(continued):
Fig. 2Coating Repair
After repairs have been completed, all repaired areas of the
HighGuard and ACT-100-U® protection system coatings shall be
re-tested with a holiday detector set at 15,000 volts.
8 • www.highlandtank.com
Remove all large and sharp rocks/debris from
excavation prior to lowering PGI into position.
Excavation and
Bedding
The excavation should provide adequate space for the PGI(s)
piping and associated equipment. It must also be free of any
hard or sharp material that could cause damage to PGI
coating.
Be certain that foreign matter is not introduced into the
excavation or backll.
The total depth of the excavation is determined by the PGIs
diameter, bedding thickness, hold-down pad (if required) depth of
cover (including any effects of vehicular trafc) and slope and length
of piping. Consult AHJ for additional requirements related to existing
structures.
CAUTION:
DO NOT exceed maximum burial depth as predetermined
by manufacturer.
Bedding and backll must be a homogenous material
consisting of compacted clean sand, pea gravel, No. 8 crushed
stone (American Society of Testing and Materials - ASTM-448) or
equivalent. (100% through a 1/2 inch (13 mm) sieve and no more
than 12% by dry weight through a #200 sieve (0.0029 Inch (0.0754
mm)). Pea gravel shall be no larger than 3/4-inch (19 mm). See Fig.
3.
Fig. 3
Slope of excavation
determined by soil
type and/or code.
Consult AHJ.
24" Minimum
12" Minimum - Clean inert sand,
pea gravel or crushed stone
www.highlandtank.com • 9
Excavation and
Remove all large and sharp rocks/debris from
excavation prior to lowering PGI into position.
Bedding
(continued):
The bottom of the excavation must be covered with bedding
material to a minimum depth of one foot, suitably graded and leveled and extend at least two feet around the perimeter of the PGI for
backll operations. Place at least 24 inches of backll between any
adjacent PGIs, tanks and excavation walls. See Fig. 4.
Fig. 4
Placement of the PGI
Slope of excavation determined by
soil type and/or code. Consult AHJ.
Highland Tank
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Installation & Maintenance Instructions are available at www.highlandtank.com
®
HTM-0001
24" Minimum
The PGI must be installed in a level and plumb position.
Check elevations at each end of the PGI with a transit and adjust as
necessary to 1/2 inch in 20 feet. Check elevations across the diameter of the PGI and adjust to 1/4 inch in 10 feet.
10 • www.highlandtank.com
Anchoring
Deadman
A
Concrete
Tu
hook ends
High water tables or partially ooded excavation sites exert
signicant buoyant forces on PGI. Buoyant forces are partially resisted by the weight of the PGI, the backll and any pavement atop the
PGI. Additional buoyant restraint, when required, is obtained by using properly designed hold-down straps in conjunction with concrete
hold-down pads or deadman anchors. The use of steel cable and/or
round bar as buoyant restraints is prohibited.
Steel hold-down straps must always be kept from contacting the
PGI shell by an oversized separating pad made of inert insulating
dielectric material.
Several hold-down methods are available for anchoring the PGI in
the excavation. Consult AHJ and choose the method that completely satises all requirements for the installation location. Highland
Tank’s Deadman Anchoring System
employs concrete deadman anchors and polyester
hold-down straps.
When using deadman anchors, the bottom of the excavation
(native earth) shall be covered with a minimum of 12 inches of bedding material suitably graded and leveled. Bedding and backll
shall surround the PGI to a width and depth of 12 inches minimum
all around the PGI. Position deadmen as shown in Fig. 5, lling the
space between them with
approved backll material.
When anchoring by means of a concrete pad is required, the PGI
Fig. 5
Deadman
Anchors
rnbuckles with
nchors
Polyester
Hold-down
Strap
Galvanized
Wire Rope
Cable Clamps
Anchoring Points
Top of deadman anchors to be level with
bottom of PGI. Fill area between deadmen
with 12" or 18" approved bedding material.
Distance between inside edges of
deadmen equivalent to PGI diameter
www.highlandtank.com • 11
Anchoring
Standard Hold-down Straps
6" minimum approved
bedding material
(Contact Highland
T
more than 12”)
(continued):
must not be placed directly on the pad. See Fig. 6.
A layer of bedding material, 6 inches deep must be spread evenly over the dimensions of pad to separate the PGI from the pad.
Bedding deeper than 12 inches may interfere with the t of the
hold-down straps. The PGI must not be placed on any other hard or
sharp material, which might cause
deformation of the PGI or damage to the coating.
Fig. 6
Hold-down strap
with Concrete Hold-down Pad
ank if using
with neoprene liner
Strap
Turnbuckle
Hole in
angle for
anchor bolt
Reinforced concrete anchor pad
Anchor Bolt
In tidal areas, backll or bedding materials composed of small particles, such as sand, can migrate into native soils where larger aggregate, such as pea gravel or crushed stone, exists. Resultant voids
can create an uneven support for the PGI. The use of lter fabric is
recommended.
12 • www.highlandtank.com
Backlling
Special placement and compaction
Remove all large and sharp rocks/debris that may
Special placement and compaction
Remove all large and sharp rocks/debris that may have
Approved backll similar to bedding material must be placed around
the entire PGI to create a uniform homogeneous environment. Be
certain that foreign matter is not introduced into the excavation or
backll. Special care shall be taken when backlling to ensure that
the PGI is fully and evenly supported around the bottom quadrant
and that no damage to the coating occurs. See Fig. 7 and 8.
Fig. 7
have fallen into the excavation before backfilling.
Fig. 8
fallen into the excavation before backfilling.
of backfill may be required
of backfill may be required
Ballasting
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Installation & Maintenance Instructions are available at www.highlandtank.com
The backll should be placed carefully around the PGI to the top of
HTM-0001
®
Highland Tank
the PGI.
In areas where there is the presence of ground water or a high water
table, ballasting may be necessary for additional downward force on
the PGI. If required, ll PGI with clean water. After ballasting is complete, check elevations for proper tolerances.
www.highlandtank.com • 13
Manway Extensions
Steel Manway Extension
Field-Adjustable Manway Extension
Fig. 9
Field-Adjustable
Manway Extension
Two 12" sections with piping
access and two 6" sections
for custom fit on-site
PGI installations may include manway extensions to provide
access to the PGI from grade level. Highland Tank supplies two
types of extensions; a eld-adjustable, high-density polyethylene riser or an exact-size, coated-steel one-piece manway riser. Both risers
bolt onto the PGI manway collars and employ gaskets to provide a
seal between components. Install risers based on the type supplied
with your PGI using diagrams below for guidance. See Fig. 9 and 10.
Manway extension lid with
quick-release latches
Safety screen
Nut, bolt and washers
Manway collar on PGI
Fig. 10
Coated-Steel
Manway Extension
quick-release latches
Manway extension
Manway adapter with
bolt-on retainer ring
Neoprene Gasket
PGI
Nut, bolt &
washers
Manway adapter with
bolt-on retainer ring
Gaskets
14 • www.highlandtank.com
Manway collar on PGI
PGI
Piping & Venting
PGI is supplied with plain end connections for simple and easy
transition to inlet/outlet pipe system. Plain end connections must
be free of dirt and oils that may affect the proper and positive seal of
couplings to piping system.
Piping
Inlet piping installation should be straight and true with as few turns
as possible to limit turbulence. (When dielectric isolation is required,
consult Steel Tank Institute ACT-100-U® Installation Instructions,
R971 and Petroleum Equipment Institute PEI/RP100 for further instructions.)
Attach inlet/outlet piping (contractor supplied) to inlet/outlet
pipes on the PGI. Inlet and outlet inverts were established during
manufacturing. Do not modify without rst consulting Highland Tank.
The PGI inlet and outlet piping must be sloped from 1/8 inch to 1/4
inch per foot to maintain gravity ow. A greater slope, or a free fall
of wastewater in the PGI, will cause turbulence, adversely affecting
PGI performance. Piping must also be designed to limit ow into the
PGI to the ow rate specied. Use of a ow control device may be
necessary.
PGI outlet piping must be designed to ow at a rate equal to or
greater than the inlet piping to avoid any potential backup.
Attach manway extensions, riser and sensor pipes and any other
contractor supplied piping to the PGI. Take special care to prevent
damage to any gaskets or pipe threads.
www.highlandtank.com • 15
Piping & Venting
(continued):
Venting
PGI is designed for operation at atmospheric pressure ONLY.
Most codes require the outlet to be vented to atmosphere.
Conrm requirements with AHJ.
Vent piping requirements vary by code. Check with AHJ.
Terminate all vent piping per local code and AHJ.
Consult AHJ for inlet and manway venting requirements. If required,
inlet and outlet must be vented to atmosphere separately. Manways
may be manifolded together. See Fig. 11.
If PGI is equipped with a Highland Tank FOGSWatch probe, care
must be taken to provide proper access for periodic maintenance.
The FOGSWatch is installed either through an NPT tting or a man-
Fig. 11
Inlet
Field Adjustable
Manways Risers
Passive Grease Interceptor
Outlet Vent Piping
by Installer
Outlet
16 • www.highlandtank.com
FOGSWatch Probe
Installation
Fig. 12
way in the PGI. See Fig. 12 (NPT installation) or 13 (steel manway
riser installation) if applicable.
For PGIs with FOGSWatch sensor, pump-out pipes or other
piping, install riser pipes using compatible non-hardening sealant,
taking care not to cross thread or damage the nonmetallic bushings.
Field Adjustable
Poly Manway
Riser
Fig. 13
FOGSWatch remote control unit & enclosure
Grade-level manway
if required
6" PVC plug fitted
with 3/4" PVC pipe stub
6" PVC
female adapter
}
3/4" PVC pipe
Clean and seal all connections per local code during installation.
*Installer provided equipment.
6" PVC
male adapter
supplied at
proper length
3/4" Cord grip connector or
conduit to control panel*
3/4" PVC coupling (glue - NPT)
3/4" PVC coupling (glue - glue)
6" SCH 40 PVC as needed
to grade*
6" NPT fitting in PGI
FOGSWatch Transducer with
100' of cable. Thread cable
through PVC pipe and
connect to control unit.
FOGSWatch remote control unit & enclosure
Installer provided conduit and wiring from
manway to control unit
}
Clean and seal all connections per
local code during installation.
Mounting bracket welded
to manway riser
PVC pipe guide
installed at factory
Steel manway riser
Installed provided 3/4" PVC
pipe cut to length on site
FOGSWatch Transducer with
100' of cable. Ships loose.
Thread cable through PVC pipe
and connect to control unit.
www.highlandtank.com • 17
Sealing of Lifting Lugs
and Pipe Connections
Torque of 400 to 1,000 foot-pounds may be required to fully insert
pipe. Contact Highland Tank for specic wiring instructions.
During the installation process, steel can become exposed at the
lifting lug due to the handling of the PGI. These areas, along with all
other exposed steel surfaces, must be
covered using the coating kit supplied by the manufacturer.
Apply supplied coating touch-up to all exposed steel
surfaces of the PGI and allow to cure completely. Cure time will vary
depending on temperature and conditions.
After an air test has established tightness, apply coating to the PGI
ttings and allow to cure prior to backll. Coating must include the
entire plug on unused ttings.
After all coating touch-up applications, the installer must verify that
all of the coating has cured (adequate material hardness and solidication) prior to nal backll that will completely cover the PGI.
Deposit homogeneous backll carefully around PGI to a depth of at
least one foot over PGI to avoid damage to coating especially where
tamping is required. Refer to the National Fire Protection Association’s Regulation NFPA 30 and state or local codes for minimum
depth of cover required.
18 • www.highlandtank.com
Depth of Cover in Areas Subject to Traffic
Depth of Cover in Areas Not Subject to Traffic
8 Reinfor
C
e
6
p
h
ced
ncrete
4
Co
Final Backlling
Finally, carefully deposit backll over the PGI up to the
elevation needed to complete grade level nishing. See Fig. 14 for
minimum burial depth. Consult approval drawing for maximum burial
depth.
Use grade level covers and street boxes to access the
manways, sensors, or pump-out pipes. The grade level
covers above the access manways must be of a greater
diameter (i.e. 36 inch grade level cover over a 24 inch access manway).
The PGI must be full of water to operate.
Separated FOG and vapors may be ammable
and/or combustible.
Fig. 14
36"
30"
sphalt
Unpaved
6" Asphalt
Top of PGI
18"
8" Reinforced
Concrete
oncret
4" Reinforced
Reinfor
Concrete
12"
6" Asphalt
As
12"
24"
Unpaved
www.highlandtank.com • 19
PGI Start-Up
IMPORTANT:
CAUTION:
Filling the PGI
Service personnel must comply with all established OSHA
regulations governing the facility and services. These
include, but are not limited to, the use of approved breathing
equipment, protective clothing, safety equipment, etc.
When applicable, the nal state of all wiring must comply with
all electrical and re code standards.
This system must be properly vented by installer in
accordance with applicable plumbing and safety codes for venting of combustible gases.
When applicable, all electrical equipment, connections and
wiring must be protected from submergence and inltration of
water.
Open the PGI inlet and outlet pipe valves.
If the PGI has not yet been lled with water, as may have been required for balasting, (see page 13) ll with clean, fresh water at this
time. The PGI must be full of water before any wastewater can be
treated. The PGI can be lled through the facility’s drain leading to
the PGI inlet or through a manway.
If lling by manway, remove the manway lid and place the hose
through manway so that hose outlet rests inside the PGI.
The PGI is full when water drains out of the Outlet. Check the water
level using a gauge stick. The level on the gauge stick must equal
the invert of the Outlet Pipe as measured from the PGI bottom.
To ensure that no blockage exists, allow water to ow through the
facility drain which leads to the PGI Inlet. Check the Outlet Pipe to
make sure that water is owing through the PGI. Check the Inlet
Pipe and facility’s drain for water backup.
The efciency of the PGI can be maintained by following the
proper cleaning schedule and adhering to basic Best Management
Practices (BMP). See Appendix A.
Highland Tank manufactures a wide variety of models and designsfor underground, underground vaulted and aboveground installation.
PGIs may be customized with options and accessories to meet specic site needs. Contact Highland Tank should you have any questions about a particular design or option.
20 • www.highlandtank.com
Operation
IMPORTANT:
The Highland Tank PGI will not remove FOG with a specic
gravity greater than .95, chemical or physical emulsions,
dissolved fats, cleaning solvents and surfactants.
Any and all FOG recovered and removed from the PGI should be
recycled or disposed of in accordance with federal, state and local
regulations.
Designed to accept gravity ow, the PGI’s volume and retention time
permit these contaminants to separate from the water due to their
differences in specic gravity. The PGI contains one to three chambers (basins) where FOG separates and oats to the surface, while
solids settle to the bottom.
FOG accumulates in the PGI until being removed. The clearer water
beneath the separated wastes ows downward to the downcomer
pipe where it is discharged from the nal PGI chamber.
PGI sizing and construction conforms to recognized plumbing codes
and the efuent discharge meets or exceeds many municipal industrial sewer pretreatment regulations.
During operation, the wastewater ows into the PGI through the inlet
pipe and is directed over the Inuent Flow Diffusion Bafe, a reinforced steel plate inclined at a 45 degree angle.
The Inuent Flow Diffusion Bafe
- dissipates the velocity and turbulence of the incoming
water,
- redirects the ow downward and toward the PGI head to
start serpentine ow process,
- reduces and distributes the ow evenly over the PGI’s
cross-sectional area, and
- isolates the inlet turbulence from the rest of the PGI.
In the rst chamber, heavier solids settle out and are collected behind the Sludge Bafe. Concentrated FOG rises immediately to the
surface. Free oating oils and grease in the wastewater gradually
separate from the water due to their differences in specic gravity
and will rise to the top of each chamber.
Flow from one chamber to the next is by gravity displacement over
and under the bafes. When wastewater enters the PGI, the cleaner water from the bottom of each chamber is moved into the next
chamber while trapping the oating and sinking contaminants.
In each subsequent chamber, additional FOG and solids are
removed due to the specic gravity differences. During periods of
www.highlandtank.com • 21
Operation
continued
operation and wastewater ow, FOG continues to accumulate in the
PGI chambers.
Treated water is only discharged from the bottom of the nal PGI
chamber via the outlet pipe during periods when wastewater ows
into the PGI. Wastewater ows from the PGI to a sanitary sewer or is
pumped to be recycled for reuse.
See Fig. 15 - Operation Simulation for a better understanding of the
PGI operation.
Maintenance is critical to the PGI’s performance. Routine
maintenance includes but is not limited to:
• Checking for and removing obstructions from inlet, outlet
and vent pipes
• Removal of FOG and/or solids from all chambers of the PGI
• Complete pump-out and cleaning of the PGI
Never enter a PGI or enclosed space, under any condition, without proper training and OSHA approved equipment.
(Consult OSHA, Regulations for Permit-Required Conned
Spaces, 29 C.F.R. § 1910.146.)
All enclosed spaces must be properly vented prior to entry to avoid
ignition of ammable materials or vapors.
22 • www.highlandtank.com
Fig. 15
Operation Simulation - Triple Basin PGI shown for illustration purposes only.
Refer to design drawing for a more accurate representation of specic model.
Field-adjustable Riser with Safety Screens include
Sealed Vapor Covers for Odor Prevention
Indirect Efuent Flow
Transfer Bafe
HighGuard Protection System
Inlet Pipe
FOGSWatch
Sensor
Sludge Bafe
Grease Dam
Switchback
Bafing System
Hold-down
Straps
Outlet Pipe
Internal Lining
Concrete Deadman Anchors
or Hold-Down Pad
Inspection
Flow Diffusion and
Energy Dissipater Bafe
Solids Collection
The purpose of this section is to ensure that inspection of the PGI
is completed on a regular schedule and documented as required by
local, state and federal laws, regulation and codes. All food service
facilities must regularly inspect and maintain the PGI.
Highland recommends that an inspection and maintenance log be
created and maintained. See Appendix B. Documenting FOG and
solids levels over a period of time will help a facility determine service intervals for the PGI.
www.highlandtank.com • 23
Maintenance
CAUTION:
Atmosphere must be properly tested for combustible vapors and
oxygen prior to entry.
Entering the PGI without using a self-contained breathing
apparatus may result in inhalation of hazardous fumes, causing
headache, dizziness, nausea, loss of consciousness and death.
Required entry equipment includes, but is not limited to:
• Lifelines
• Safety harnesses (safety belts are unacceptable)
• Self-contained breathing apparatus
• Respirators (canister type)
• Rescue harness and ropes
• Horns, whistles, radios, etc. (for communication purposes)
• Explosion-proof lighting
Be sure to inspect and replace manway gaskets as necessary
when the PGI is shut down for maintenance.
Inlet and efuent pipe valves should be closed prior to PGI entry.
IMPORTANT:
All liquid must be removed from the PGI prior to entry. Any and all
FOG recovered and removed from the PGI should be recycled or
disposed of in accordance with federal, state and local laws, regulations and codes.
PGI are designed for long-term operation. The following maintenance should be performed as needed and on a regular maintenance schedule. This procedure outlines the method to inspect a
PGI and document the results.
24 • www.highlandtank.com
Maintenance
(continued):
For optimum performance, inspections should be performed
regularly. Failure to do so may cause system back-up.
Perform maintenance as required.
Inspect PGI after an unusually heavy ow event to check for signs of
malfunction due to an excessive ow rate.
Food Service Facility must follow local, state and federal codes for
proper interval of grease collection and removal.
Applicable law may require the FSE to manifest the FOG removed
from the facility. This helps in tracking and recording the grease volume pumped from the facility and to ensure the grease is hauled to
a proper location for disposal.
Stop wastewater ow to the PGI by closing the inlet valve or other
site-specic means. Remove grade-level and PGI manway covers to
access the PGI.
• Check inlet manway and bafe to ensure clear passage.
• Check outlet bafe for clear passage.
Determine FOG &
Solids Layer Thickness
Tools and equipment needed:
• Safety equipment if necessary to redirect trafc
• Facility-specic equipment to lift and remove grade-level
manway covers
• Measuring device
• Cleaning materials
Check the thickness of FOG and solids layers as required. If either
layer individually or combined are more than 25% of the PGI’s total
volume, the PGI needs to be cleaned out.
To check thickness of FOG, use an appropriate sludge measuring
device. Slowly lower measuring device until it comes in contact with
the bottom of the PGI. Remove the measuring device to reveal the
thicknesses of the both top/FOG (A) and bottom/solids (B) layers.
See Fig 17.
www.highlandtank.com • 25
Maintenance
continued
The PGI needs to be pumped out if A + B > 25% of C
Fig. 16
Individual
chamber of PGI
PGI Pump-out
Procedure
FOG/Water
Interface
FOG
Water
Solids
A
C
B
Close inlet and outlet valves, Remove manway covers and any
internal monitoring equipment (e.g. FOGSWatch). Be careful when
removing manway covers to prevent damage to gaskets. Contact
Highland Tank should you need replacement gaskets or other parts.
Using suction, completely remove all contents of PGI.
Using hot water and detergent, loosen and remove any caked or
hardened FOG. It may be necessary to use a non-metallic scraping
device to assist in the removal process. Using suction, completely
remove all contents of PGI.
IMPORTANT:
Restart the PGI
26 • www.highlandtank.com
Dispose of FOG and wastewater as required by applicable law and
AHJ requirements.
Reattach manway covers and any monitoring equipment. Ensure
gaskets are damage free. Use appropriate pipe
sealant where required. Refer to PGI Start-up Instructions on page
20 for relling the PGI and putting it back into service.
OPTIONAL FOGSWATCH
CONTROL PANEL
PROVIDED
VENT PIPING
*CONTRACTOR
GRADE-LEVEL
MANWAYS WITH COVER
GREASE DAMS
OUTLET
WATER
BEDDING & BACKFILL
CONTRACTOR PROVIDED
BAFFLE
FLOW TRANSFER
INDIRECT EFFLUENT
FIELD-ADJUSTABLE MANWAY
WITH SAFETY CAGE & COVER
PAD OR DEADMAN ANCHORS
CONTRACTOR PROVIDED HOLD-DOWN
OPTIONAL
FOGSWATCH SENSOR
SLUDGE
BAFFLES
CONTRACTOR PROVIDED
For illustration purposes only
HT-TB - Triple Basin, Single-wall Passive Grease Interceptor Reference Drawing
INFLUENT FLOW
GRADE-LEVEL CONCRETE PAD
DIFFUSION BAFFLE
INLET
PLATES
STRIKER
*VENTING OF THE INLET AND MANWAY RISERS IS OPTIONAL DEPENDING ON LOCAL CODE.
CONSULT WITH AHJ FOR SPECIFIC SITE REQUIREMENTS.
www.highlandtank.com • 27
Other PGI
Congurations
Single-basin interceptors have a
single collection chamber and a
sludge bafe to remove FOG and
solids. This simple design is
sometimes referred to as a
“knock-out” interceptor.
Double-basin interceptors have
two collection chambers and a
sludge bafe.
Triple-basin interceptors have
three collection
chambers and a sludge bafe.
FOG and solids are trapped in
the rst compartment and any
remaining grease is trapped in the
second compartment. The third
chamber can be modied and
equipped with an efuent pump
system when gravity ow to the
sewer is not an option.
Several special design models are
available to satisfy specic code
requirements such as - Washington
Suburban Sanitary Commission (WSSC),
IAPMO/ANSI Z1001 - 2007 and the Florida
Grease Trap Code. Contact Highland Tank
for information about products to satisfy
particular code requirements.
28 • www.highlandtank.com
Options & Accessories
Some PGIs come equipped with special heating devices,
insulation, remote pump-out devices, sampling ports,
integral lift stations, ladders, platforms, walkways, stairs, monitors
and control panels. These items are projectspecic. Please contact Highland Tank for assistance.
Best Management
Practices
FOG control BMPs are practices that will reduce the amount of FOG,
that enters the sewer system or on-site septic
system from your food service facility.
The examples on the next page of this Manual set forth
certain BMPs that will reduce the amount of grease entering the
waste collection system from your FSE. It also gives
examples of harmful practices to avoid because such
practices increase the amount of grease entering the
waste collection system.
High oil and grease concentrations can be lowered by
minimizing the amount of food being discharged down
all drains (including those attached to two or three
compartment sinks and automatic dishwashers). The least expensive alternative that can be used in reducing grease in the sewer
system is improved kitchen management
practices.
The following two pages should be copied and posted
near food preparation and other areas as a reminder to
employees about BMPs for FOG.
www.highlandtank.com • 29
Appendix - A
Best Management Practices
• Do not pour, scrape, or otherwise dispose of fats, oils
and grease into sinks or drains.
• Scrape pots and pans prior to washing them.
• Collect fryer oil and store in barrels for recycling.
• Dump mop water only into drains connected to your
grease abatement system.
• Use absorbents to soak up spills containing fats,
oils and grease.
• Do not put food (including liquid food) including milk
shake syrups, batters, and gravy down the drain.
• Use strainers on sinks and oor drains to prevent solid
material from entering the sewer.
• Post “NO GREASE” signs near sinks and drains.
• Empty the collection pan on automatic grease recovery
devices before it becomes full.
• Use the proper equipment for cleaning your grease trap
or grease recovery device.
• Direct wastewater generated from duct/range lter
cleaning through the grease abatement system.
• Inspect grease abatement devices/interceptors after
pumping to ensure adequate cleaning
• All kitchen staff must follow these best-management
practices for grease disposal to avoid grease
accumulation in the sewer.
• All kitchen, management and maintenance staff must
receive refresher training for proper disposal of fats, oils,
and grease.
30 • www.highlandtank.com
DON’T KNOW?
STOP!
ASK A MANAGER
Appendix - B
Installation for
Aboveground PGI Cylindrical &
Rectangular
Placement of the PGI
Piping & Venting
Aboveground PGI installations vary by site. The general guidelines
provided here are to aid in the correct installation of a Highland Tank
PGI. Always consult with the AHJ for site and municipal-specic
code requirements.
Prior to beginning, please review the Important Points to Consider
on pages 4 and 5.
The PGI must be installed in a level and plumb position. Highland
Tank recommends placing the PGI on a concrete pad of suitable
thickness and size to completely support the PGI and provide
enough clearances to perform required maintenance. Consult the
AHJ and engineer of record for site-specic requirements.
Follow guidelines as described on pages 15 and 16. Consult AHJ for
inlet and manway venting requirements.
The optional FOGSWatch probe is installed in the PGI similar to that
of an underground unit, either through one of the manways or an
NPT tting located on the top center of the PGI. Refer to page 17 for
installation guidelines.
Sealing of Lifting Lugs
& Pipe Connections
Start-up
Instructions
During the installation process, steel can become exposed at the
lifting lug due to the handling of the PGI. These areas, along with all
other exposed steel surfaces, must be covered using the coating kit
supplied by the manufacturer.
Apply supplied coating touch-up to all exposed steel
surfaces of the PGI and allow to cure completely. Coating must include the entire plug on unused ttings.
After all coating touch-up applications, the installer must verify that
all of the coating has cured (adequate material hardness and solidication) prior to nal backll that will completely cover the PGI.
Cure time will vary depending on temperature and
conditions.
Continue with Start-Up Instructions on page 23.
www.highlandtank.com • 31
OPTIONAL FOGSWATCH
CONTROL PANEL
OUTLET
OPTIONAL SAMPLE
PORT (ADAPTABLE
TO ANY PIPING
SYSTEM)
WATER
BAFFLE
PROVIDED
VENT PIPING
*CONTRACTOR
OPTIONAL
FOGSWATCH SENSOR
WALKWAY
WITH RAILING
FLOW TRANSFER
INDIRECT EFFLUENT
BAFFLE
SLUDGE
DAM
GREASE
SADDLES
SUPPORT
PLATES
STRIKER
ACCESS
LADDER
WITH LATCH & LOCK
QUICK-OPEN HATCH
FIBERGLASS
SAFETY GRATING
For illustration purposes only
HT-DB - Double Basin, Single-wall Passive Grease Interceptor Reference Drawing
32 • www.highlandtank.com
INLET
INFLUENT
FLOW
DIFFUSION
BAFFLE
CONTRACTOR PROVIDED
GRADE-LEVEL CONCRETE PAD
*VENTING OF THE INLET AND MANWAY RISERS MAY BE REQUIRED BY LOCAL CODE.
CONSULT WITH AHJ FOR SPECIFIC SITE REQUIREMENTS.
Facility Name:
Address: City: State: ZIP:
Highland Tank - Passive Grease Interceptor Inspection and Maintenance Log - Serial #
Use a separate log sheet for each unit
Contact Name: (Please print) Phone: ( ) -
PGI Unit Details
Model No.: PGI - Flow rate: (GPM) Operating grease volume: (GAL) ( L B S )
Location of grease interceptor:
(e.g.: Building 1 basement, 1st St. parking garage, etc.)
Service/Maintenance Provider
Company Name: License No.:
Address: City: State: ZIP:
Contact Name: (Please print) Phone: ( ) -
The Highland Tank PGI grease interceptor should be inspected on a regular schedule as determined by facility needs. Renderings from the grease
interceptor must be recycled or disposed of properly by a licensed waste hauler. Documentation of cleaning and disposal shall remain up-to-date
and available at all times.
www.highlandtank.com • 33
PGI Maintenance Log WEEK - MONTH - YEAR
34 • www.highlandtank.com
Date / / Work performed by:
Action taken:
Volume removed: (gal./lb. Disposal method:
Observations/comments:
Date / / Work performed by:
Action taken:
Volume removed: (gal./lb. Disposal method:
Observations/comments:
Date / / Work performed by:
Action taken:
Volume removed: (gal./lb. Disposal method:
Observations/comments:
Date / / Work performed by:
Action taken:
Volume removed: (gal./lb. Disposal method:
Observations/comments:
Grease Hauler Manifest
Food Service Establishment
Must be completed by qualied FSE Representative
Business Name: Telephone: ( ) -
Address: City: State: Zip:
Waste removed from: Grease Trap: Yes / No, Grit Trap: Yes / No, Septic Tank Yes / No
Other (Specify):
Waste tank or trap capacity: _____________________ gallons
I certify that the waste material removed from the above premises contains no hazardous materials.
FSE Representative Signature:
Print name:
Date and time serviced:
Transporter Information
Must be completed by transporter
Business Name: Telephone: ( ) -
Address: City: State: Zip:
Waste removed from: Grease Trap: Yes / No, Grit Trap: Yes / No, Septic Tank Yes / No
Other (Specify):
Vehicle tag number: Vehicle capacity: gallons Gallons removed:
I certify that the information provided above is correct. I am aware that falsication of this trip ticket may result in
enforcement action by the appropriate jurisdiction.
Driver’s Signature:
Print name:
Driver’s license No.: Date and time waste accepted:
Disposal Information
Must be completed by disposer
Business Name: Telephone: ( ) -
Address: City: State: Zip:
Waste disposal site:
Waste disposal method (describe):
Facility permit No.: Date and time waste accepted:
I certify that the disposal facility used is authorized to accept the above specied waste and that I have disposed of the
waste in accordance with the requirements outlined in that authorization and in accordance with all applicable federal,
state and local laws and regulations.
Site Operator’s Signature:
Print name:
www.highlandtank.com • 35
36 • www.highlandtank.com
NO
NO
GREASE
GREASE
grease i
nterceptors
HT-2816
Stoystown, PA
One Highland Road
Stoystown, PA 15563-0338
T: 814-893-5701
Manheim, PA
4535 Elizabethtown Road
Manheim, PA 17545-9410
T: 717-664-0600
Watervliet, NY
958 19th Street
Watervliet, NY 12189-1752
T: 518-273-0801
Greensboro, NC
2700 Patterson Street
Greensboro, NC 27407-2317
T: 336-218-0801
Lebanon, PA
2225 Chestnut Street
Lebanon, PA 17042-2504
T: 717-664-0602
Friedens, PA
1510 Stoystown Road
Friedens, PA 15541-7402
T: 814-443-6800
Clarkston, MI
4701 White Lake Road
Clarkston, MI 48346-2554
T: 248-625-8700
Mancelona, MI
9517 Lake Street
Mancelona, MI 49659-7968
T: 251-587-8412
www.highlandtank.com
gru@highlandtank.com
814.893.5701 | highlandtank.com
© Highland Tank HT-2816 – 05/2019
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