ASTM C1613-24

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C1613 − 22 C1613 − 24
Standard Specification for
Precast Concrete Gravity Grease Interceptor Tanks
This standard is issued under the fixed designation C1613; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification covers design requirements, manufacturing practices, and performance requirements for monolithic or
sectional precast concrete grease interceptor tanks.
1.2 This specification describes precast concrete tanks installed to separate fats, oils, grease, soap scum, and other typical kitchen
wastes associated with the food service industry.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.4 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A184/A184M Specification for Welded Deformed Steel Bar Mats for Concrete Reinforcement
A615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement
A706/A706M Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete Reinforcement
A1064/A1064M Specification for Carbon-Steel Wire and Welded Wire Reinforcement, Plain and Deformed, for Concrete
C33/C33M Specification for Concrete Aggregates
C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens
C94/C94M Specification for Ready-Mixed Concrete
C125 Terminology Relating to Concrete and Concrete Aggregates
C150/C150M Specification for Portland Cement
C260/C260M Specification for Air-Entraining Admixtures for Concrete
C330/C330M Specification for Lightweight Aggregates for Structural Concrete
C494/C494M Specification for Chemical Admixtures for Concrete
C595/C595M Specification for Blended Hydraulic Cements
This specification is under the jurisdiction of ASTM Committee C27 on Precast Concrete Products and is the direct responsibility of Subcommittee C27.30 on Water
and Wastewater Containers.
Current edition approved Jan. 1, 2022Feb. 1, 2024. Published January 2022February 2024. Originally approved in 2006. Last previous edition approved in 20172022 as
C1613 – 17.C1613 – 22. DOI: 10.1520/C1613-22.10.1520/C1613-24.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1613 − 24
C618 Specification for Coal Ash and Raw or Calcined Natural Pozzolan for Use in Concrete
C685/C685M Specification for Concrete Made by Volumetric Batching and Continuous Mixing
C890 Practice for Minimum Structural Design Loading for Monolithic or Sectional Precast Concrete Water and Wastewater
Structures
C923/C923M Specification for Resilient Connectors Between Reinforced Concrete Manhole Structures, Pipes, and Laterals
C990 Specification for Joints for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed Flexible Joint Sealants
C1116/C1116M Specification for Fiber-Reinforced Concrete
C1602/C1602M Specification for Mixing Water Used in the Production of Hydraulic Cement Concrete
C1889 Practice for Minimum Structural Design Loading for Monolithic or Sectional Precast Concrete Utility, Water, and
Wastewater Structures Using AASHTO LRFD Design
2.2 ACI Standard:
ACI 318 Building Code Requirements for Reinforced Concrete
2.3 IAPMO Documents:
Uniform Plumbing Code
IAPMO PS-80 Grease Interceptors and Clarifiers
2.4 AASHTO Standard:
Standard Specifications for Highway Bridges
AASHTO LRFD Bridge Design Specifications
3. Terminology
3.1 For definitions of terms relating to concrete, see Terminology C125.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 access opening, n—a hole in the top slab used to gain access to the inside of the tank for the purpose of cleaning and
removing grease, floating scum and sludge without a person actually having to enter the tank.
3.2.2 air scum volume, n—the number of cubic inches (centimeters) in the space between the liquid surface and the underside of
the top slab.
3.2.3 baffle, n—a device, such as a sanitary tee or other deflector, used to direct the flow of influent down below the separated layer
and prevent floating layer of fats, oils, or grease from exiting the tank through the outlet.
3.2.4 grease interceptor capacity, n—the volume of liquid the tank is designed to hold.
3.2.5 grease interceptor tank system, n—a single tank or series of tanks in which wastes from a kitchen or food service
establishment containing no sanitary discharges from toilets, urinals and other similar fixtures are received and retained, and from
which the liquid effluent, which is comparatively free from fats, oils, greases and settleable and/or floating solids, is then discharged
to a public sewer, septic or other approved treatment system.
3.2.6 inspection opening, n—a hole in the top slab used for the purpose of observing conditions inside the tank.
3.2.7 joint, n—a physical separation where two pieces of precast concrete are in contact.
3.2.8 non-sealed joint, n—a joint where sealant is not used but where a machined fit will minimize the movement of liquid from
one side of a precast concrete wall to the opposite side.
3.2.9 owner, n—is by definition end user, customer, or purchaser.
3.2.10 sealed joint, n—a joint that is sealed to prevent liquid passing from one side of a precast concrete wall to the opposite side.
Available from American Concrete Institute (ACI), P.O. Box 9094, Farmington Hills, MI 48333-9094, http://www.concrete.org.
Available from International Association of Plumbing and Mechanical Officials (IAPMO), 5001 E. Philadelphia St., Ontario, CA 91761, http://www.iapmo.org.
Available from American Association of State Highway and Transportation Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
http://www.transportation.org.
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3.2.11 tank dividing wall, n—a partition across the width of the tank that extends partially between the top and bottom intended
to deflect influent downward and increase the length of the flow path of the liquid as it travels through the tank.
4. Ordering Information
4.1 The purchaser shall include the following information in bidding documents and on the purchase order, as applicable to the
units being ordered:
4.1.1 Reference to this specification, and date of issue.
4.1.2 Quantity, that is, number of units ordered.
4.1.3 Capacity of tank in gallons or litres.
4.1.4 Special cement requirements including moderate sulfate-resisting cement, Specification C150/C150M Type II, or highly
sulfate-resisting cement, Specification C150/C150M, Type V. If the purchaser does not stipulate, the manufacturer shall use any
cement meeting the requirements of Specification C150/C150M or C595/C595M (Type IS or Type IP only).
4.1.5 Acceptance will be based on a review of the calculations or on proof tests.
4.1.6 Design requirements such as depth of earth cover, live load applied at the surface, and ground water level.
4.1.7 Testing for water leakage shall not be required at the job site unless specifically required by the owner at the time of ordering.
4.1.8 Manufacturer is permitted to require testing at the job site prior to backfill in accordance with section 9.1.2.
5. Materials and Manufacture
5.1 Cement—Portland cement shall conform to the requirements of Specification C150/C150M or shall be portland blast-furnace
slag cement (Type IS) or portland-pozzolan cement (Type IP) conforming to the requirements of Specification C595/C595M.
5.2 Aggregates—Aggregates shall conform to Specification C33/C33M and lightweight aggregates shall conform to Specification
C330/C330M, except that the requirements for grading shall not apply.
5.3 Water—Water used in mixing concrete shall meet the requirements of Specification C1602/C1602M.
5.4 Admixtures—Admixtures, when used, shall conform to Specification C494/C494M, Specification C618, or Specification
C260/C260M and shall not be detrimental to other products used in the concrete.
5.5 Steel Reinforcement—Steel reinforcement shall conform to Specification A1064/A1064M for wire fabric; or Specification
A184/A184M, A615/A615M, or A706/A706M for bars.
5.5.1 Locating Reinforcement—Reinforcement shall be placed in the forms as required by the design.
5.5.2 Holding Reinforcement in Position During Pouring Placement—Reinforcement must be securely tied in place to maintain
position during concrete placing operations. Chairs, bolsters, braces, and spacers in contact with forms shall have a
corrosion-resistant surface.
5.6 Concrete Mixtures—The aggregates, cement, and water shall be proportioned and mixed to produce a homogeneous concrete
meeting the requirements of this specification, and in accordance with Specification C94/C94M or Specification C685/C685M.
5.7 Forms—The forms used in manufacture shall be sufficiently rigid and accurate to maintain the dimensions of the grease
interceptor tank within the stated tolerances. All casting surfaces shall be of smooth nonporous material. Form releasing agents
used shall not be injurious to the concrete.
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5.8 Concrete Placement—Concrete shall be placed in the forms and consolidated such that all reinforcement steel and fixtures are
embedded without segregation of materials or voids in the concrete.
5.9 Curing—The precast concrete sections shall be cured by any method or combination of methods that will develop the specified
compressive strength at 28 days or less.
5.10 Concrete Quality—The quality of the concrete shall be in accordance with the chapter on concrete quality in ACI 318, except
for frequency of tests, which shall be specified by the purchaser. Concrete compressive strength tests shall be conducted in
accordance with Test Method C39/C39M.
5.11 Fibers—Polypropylene or polyolefin fibers are only permitted as a secondary reinforcing material, at the manufacturer’s
option, in precast concrete grease interceptor tanks. For the purposes of this standard, secondary reinforcing material is only used
to resist temperature and shrinkage effects. Only Type III conforming to the requirements of Specification C1116/C1116M shall
be accepted.
5.12 Pipe Connections—Pipe-to-tank connections shall employ flexible connectors conforming to the requirements of Specifi-
cation C923/C923M. Materials for the connectors shall have demonstrated resistance to the effects of fats, oils, grease, and fluid
temperatures of at least 160°F (70°C).
5.13 Sealants—Flexible sealants employed in the manufacture or installation of tanks shall conform to Specification C990. Rigid
(mortar) sealing of tank sections is not permitted.
6. Structural Design Requirements
6.1 Structural design of grease interceptor tanks shall be by calculation or by performance.
6.1.1 Design by calculation shall be completed using the Strength Design Method (ultimate strength theory) or the Alternate
Design Method (working stress theory) outlined in ACI 318.
6.1.2 Design by performance requires the manufacturer to demonstrate that failure will not occur by physically applying loads to
the product. The load applied shall be 2.2 times the design live load or 1.5 times the design dead load, whichever is greater. Such
testing shall be witnessed and certified by a registered professional engineer.
NOTE 1—When synthetic fibers are used to replace some or all of the secondary steel reinforcement in the grease interceptor, equivalent performance
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 not possible to simulate concentrated loads, such as wheel loads, using vacuum
testing.
6.1.3 Tanks shall be d
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