Standard Specification for Precast Concrete Grease Interceptor Tanks

SCOPE
1.1 This specification covers design requirements, manufacturing practices, and performance requirements for monolithic or sectional precast concrete grease interceptor tanks.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard describes precast concrete tanks installed to separate fats, oils, grease, soap scum, and other typical kitchen wastes associated with the food service industry.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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31-Jul-2006
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ASTM C1613-06 - Standard Specification for Precast Concrete Grease Interceptor Tanks
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C 1613 – 06
Standard Specification for
Precast Concrete Grease Interceptor Tanks
This standard is issued under the fixed designation C 1613; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope C 94/C 94M Specification for Ready-Mixed Concrete
C 125 Terminology Relating to Concrete and Concrete
1.1 This specification covers design requirements, manufac-
Aggregates
turing practices, and performance requirements for monolithic
C 150 Specification for Portland Cement
or sectional precast concrete grease interceptor tanks.
C 260 Specification forAir-EntrainingAdmixtures for Con-
1.2 The values stated in inch-pound units are to be regarded
crete
as the standard. The values given in parentheses are for
C 330 Specification for Lightweight Aggregates for Struc-
information only.
tural Concrete
1.3 This standard describes precast concrete tanks installed
C 494/C 494M Specification for Chemical Admixtures for
to separate fats, oils, grease, soap scum, and other typical
Concrete
kitchen wastes associated with the food service industry.
C 595 Specification for Blended Hydraulic Cements
1.4 This standard does not purport to address all of the
C 618 Specification for Coal Fly Ash and Raw or Calcined
safety concerns, if any, associated with its use. It is the
Natural Pozzolan for Use in Concrete
responsibility of the user of this standard to establish appro-
C 685/C 685M Specification for Concrete Made by Volu-
priate safety and health practices and determine the applica-
metric Batching and Continuous Mixing
bility of regulatory limitations prior to use.
C 890 Practice for Minimum Structural Design Loading for
2. Referenced Documents
Monolithic or Sectional Precast Concrete Water and
Wastewater Structures
2.1 ASTM Standards:
C 923 Specification for Resilient Connectors Between Re-
A 82/A 82M Specification for Steel Wire, Plain, for Con-
inforced Concrete Manhole Structures, Pipes, and Laterals
crete Reinforcement
C 990 Specification for Joints for Concrete Pipe, Manholes,
A 184/A 184M Specification for Welded Deformed Steel
and Precast Box Sections Using Preformed Flexible Joint
Bar Mats for Concrete Reinforcement
Sealants
A 185/A 185M Specification for Steel Welded Wire Rein-
C 1116 Specification for Fiber-Reinforced Concrete and
forcement, Plain, for Concrete
Shotcrete
A 496/A 496M Specification for Steel Wire, Deformed, for
2.2 ACI Standard:
Concrete Reinforcement
ACI 318 Building Code Requirements for Reinforced Con-
A 497/A 497M Specification for Steel Welded Wire Rein-
crete
forcement, Deformed, for Concrete
2.3 IAPMO Documents:
A 615/A 615M Specification for Deformed and Plain
Uniform Plumbing Code
Carbon-Steel Bars for Concrete Reinforcement
IAPMO PS-80 Grease Interceptors and Clarifiers
A 706/A 706M Specification for Low-Alloy Steel De-
2.4 AASHTO Standard:
formed and Plain Bars for Concrete Reinforcement
Standard Specifications for Highway Bridges
C33 Specification for Concrete Aggregates
C 39/C 39M Test Method for Compressive Strength of Cy-
3. Terminology
lindrical Concrete Specimens
3.1 For definitions of terms relating to concrete, see Termi-
nology C 125.
ThisspecificationisunderthejurisdictionofASTMCommitteeC27onPrecast
ConcreteProductsandisthedirectresponsibilityofSubcommitteeC27.30onWater
and Wastewater Containers. Available fromAmerican Concrete Institute (ACI), P.O. Box 9094, Farmington
Current edition approved Aug. 1, 2006. Published August 2006. Hills, MI 48333.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from InternationalAssociation of Plumbing and Mechanical Officials
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM (IAPMO), 5001 E. Philadelphia St., Ontario, CA 91761.
Standards volume information, refer to the standard’s Document Summary page on Available from American Association of State Highway and Transportation
the ASTM website. Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C1613–06
3.2 Definitions of Terms Specific to This Standard: 4.1.8 Manufacturer is permitted to require testing at the job
3.2.1 access opening, n—a hole in the top slab used to gain site prior to backfill in accordance with section 9.1.2.
access to the inside of the tank for the purpose of cleaning and
removing grease, floating scum and sludge without a person 5. Materials and Manufacture
actually having to enter the tank.
5.1 Cement—Portland cement shall conform to the require-
3.2.2 air scum volume, n—the number of cubic inches
ments of Specification C 150 or shall be portland blast-furnace
(centimeters) in the space between the liquid surface and the
slag cement (Type IS) or portland-pozzolan cement (Type IP)
underside of the top slab.
conforming to the requirements of Specification C 595.
3.2.3 baffle, n—a device, such as a sanitary tee or other
5.2 Aggregates—Aggregates shall conform to Specification
deflector, used to direct the flow of influent down below the
C33 and lightweight aggregates shall conform to Specification
scum layer at the inlet and prevent scum from exiting the tank
C 330, except that the requirements for grading shall not apply.
through the outlet.
5.3 Water—Water used in mixing concrete shall be clean
3.2.4 grease interceptor capacity, n—the volume of liquid
and free of deleterious amounts of oils, acids, alkalies, salts,
the tank is designed to hold.
organic materials, or other substances that are incompatible
3.2.5 grease interceptor tank system, n—a single tank or
with concrete and/or steel.
series of tanks in which wastes from a kitchen or food service
5.4 Admixtures—Admixtures, when used, shall conform to
establishment containing no sanitary discharges from toilets,
Specification C 494, Specification C 618, or Specification
urinals and other similar fixtures are received and retained, and
C 260andshallnotbedetrimentaltootherproductsusedinthe
from which the liquid effluent, which is comparatively free
concrete.
from fats, oils, greases and settleable and/or floating solids, is
5.5 Steel Reinforcement—Steel reinforcement shall con-
then discharged to a public sewer, septic or other approved
form to Specification A 82 or A 496 for wire; Specification
treatment system.
A 185 or A 497 for wire fabric; or Specification A 184/
3.2.6 inspection opening, n—a hole in the top slab used for
A 184M, A 615/A 615M,or A 706/A 706M for bars.
the purpose of observing conditions inside the tank.
5.5.1 Locating Reinforcement—Reinforcement shall be
3.2.7 joint, n—a physical separation where two pieces of
placed in the forms as required by the design.
precast concrete are in contact.
5.5.2 Holding Reinforcement in Position During Pouring
3.2.8 non-sealed joint, n—a joint where sealant is not used
Placement—Reinforcement must be securely tied in place to
butwhereamachinedfitwillminimizethemovementofliquid
maintain position during concrete placing operations. Chairs,
from one side of a precast concrete wall to the opposite side.
bolsters, braces, and spacers in contact with forms shall have a
3.2.9 owner, n—is by definition end user, customer, or
corrosion-resistant surface.
purchaser.
5.6 Concrete Mixtures—The aggregates, cement, and water
3.2.10 sealed joint, n—ajointthatissealedtopreventliquid
shall be proportioned and mixed to produce a homogeneous
passingfromonesideofaprecastconcretewalltotheopposite
concrete meeting the requirements of this specification, and in
side.
accordance with Specification C 94 or Specification C 685.
3.2.11 tank dividing wall, n—a partition across the width of
5.7 Forms—The forms used in manufacture shall be suffi-
the tank that extends partially between the top and bottom
ciently rigid and accurate to maintain the dimensions of the
intended to deflect influent downward and increase the length
grease interceptor tank within the stated tolerances.All casting
of the flow path of the liquid as it travels through the tank.
surfacesshallbeofsmoothnonporousmaterial.Formreleasing
4. Ordering Information
agents used shall not be injurious to the concrete.
5.8 Concrete Placement—Concrete shall be placed in the
4.1 Thepurchasershallincludethefollowinginformationin
forms and consolidated such that all reinforcement steel and
bidding documents and on the purchase order, as applicable to
fixtures are embedded without segregation of materials or
the units being ordered:
voids in the concrete.
4.1.1 Reference to this specification, and date of issue.
5.9 Curing—Theprecastconcretesectionsshallbecuredby
4.1.2 Quantity, that is, number of units ordered.
any method or combination of methods that will develop the
4.1.3 Capacity of tank in gallons or litres.
specified compressive strength at 28 days or less.
4.1.4 Special cement requirements including moderate
5.10 Concrete Quality—The quality of the concrete shall be
sulfate-resisting cement, Specification C 150Type II, or highly
sulfate-resisting cement, Specification C 150, Type V. If the in accordance with the chapter on concrete quality inACI 318,
except for frequency of tests, which shall be specified by the
purchaser does not stipulate, the manufacturer shall use any
cement meeting the requirements of Specification C 150 or purchaser. Concrete compressive strength tests shall be con-
ducted in accordance with Test Method C 39.
C 595 (Type IS or Type IP only).
4.1.5 Acceptance will be based on a review of the calcula- 5.11 Fibers—Polypropylene or polyolefin fibers are only
tions or on proof tests. permitted as a secondary reinforcing material, at the manufac-
4.1.6 Design requirements such as depth of earth cover, live turer’s option, in precast concrete grease interceptor tanks. For
load applied at the surface, and ground water level. the purposes of this standard, secondary reinforcing material is
4.1.7 Testing for water leakage shall not be required at the only used to resist temperature and shrinkage effects. Only
job site unless specifically required by the owner at the time of Type III conforming to the requirements of Specification
ordering. C 1116 shall be accepted.
C1613–06
5.12 Pipe Connections—Pipe-to-tank connections shall em- 7.2 Shape—Grease interceptor shapes are generally speci-
ploy flexible connectors conforming to the requirements of fied by local regulations and they shall supersede the following
Specification C 923. Materials for the connectors shall have requirements.
demonstrated resistance to the effects of fats, oils, grease, and
7.2.1 The air scum volume above the liquid shall be at least
fluid temperatures of at least 160°F (70°C).
12.5 % of the volume of liquid but not less than 9 in. (230 mm)
5.13 Sealants—Flexible sealants employed in the manufac-
high for entire surface above liquid.
ture or installation of tanks shall conform to Specification
7.2.2 Minimumliquiddepthshallbe30in.(760mm)unless
C 990. Rigid (mortar) sealing of tank sections is not permitted.
otherwiseapprovedbylocalregulationsortheauthorityhaving
jurisdiction.
6. Structural Design Requirements
7.2.3 Maximum liquid depth shall be 72 in. (1800 mm)
6.1 Structural design of grease interceptor tanks shall be by
unless otherwise approved or required by local regulations, the
calculation or by performance.
authority having jurisdiction, or the design engineer.
6.1.1 Design by calculation shall be completed using the
7.2.4 Tank length shall be greater that the width.
Strength Design Method (ultimate strength theory) or the
7.3 Compartments:
Alternate Design Method (working stress theory) outlined in
7.3.1 Grease interceptor tank systems shall include single
ACI 318.
and multi-compartment units unless otherwise approved by
6.1.2 Design by performance requires the manufacturer to
local codes or jurisdiction. In multi-compartment tanks the
demonstrate that failure will not occur by physically applying
dividing walls shall be monolithically cast or placed second-
loads to the product. The load applied shall be 2.2 times the
arily utilizing a non-sealed joint with the tank body, or any
design live load or 1.5 times the design dead load, whichever
combination thereof.
is greater. Such testing shall be witnessed and certified by a
registered professional engineer. 7.3.2 Multiple units installed in series are acceptable.
7.3.3 Thetransferportbetweencompartmentsshallbesized
NOTE 1—When synthetic fibers are used to replace some or all of the
to maintain a low velocity as liquid moves between compart-
secondary steel reinforcement in the grease interceptor, equivalent perfor-
2 2
ments. A minimum of 50 in. (320 cm ) shall be used where
mance criteria can be found in section 5.4 of IAPMO PS-80.
NOTE 2—Vacuum testing may be used to simulate uniform loads. It is
local codes do not specify otherwise.
not possible to simulate concentrated loads, such as wheel loads, using
7.3.4 The transfer port between compartments shall be in
vacuum testing.
the middle 25 % of the distance from the bottom of the tank to
6.1.3 Tanks shall be designed so that they will not collapse
the water line.
or rupture when subjected to anticipated earth and hydrostatic
7.3.5 No tee, outlet filter unit, or tank-dividing wall shall
pressures when the tanks are either full or empty.
extend to the interior roof without providing for venting. The
6.1.4 At a minimum, loads from Practice C 890 designation
cross-sectional area of a vent shall be at least equivalent to a 4
A-16 (AASHTO HS20-44) shall be used for design.
in. (100 mm) diameter pipe. Poured-in-place inlet and/or outlet
6.1.5 The live loads imposed at lifting points shall be
baffles are not permitted.
considered in the design of the grease interceptor tank.
7.4 Inlet and Outlet Pipes:
6.1.6 Insertsembeddedintheconcrete(includingembedded
7.4.1 The inlet pipe shall be no less than 4 in. (100 mm) in
lifting devices) shall be designed and used according to all
diameter.
federal, state, and local regulations.
7.4.2 The difference between the invert of the inlet pipe and
NOTE 3—Lift inserts are typically manufactured with an integral factor
the invert of the outlet pipe shall be a minimum of 2 in. (50
of safety of 4, which is already accounted for in their rated load.
mm) and a maximum of 4 in. (100 mm).
6.2 Concrete Strength—The minimum compressive
7.5 Baffles and Outlet Devices:
strength (f’c) for designs shall be 4000 psi (28 MPa) at 28 days
7.5.1 Baffles or tees shall be placed at the inlet pipe. Baffles,
of age.
tees or outlet filters shall be placed at
...

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