ASTM F2418-23

Standard Specification for Polypropylene (PP) Corrugated Wall Stormwater Collection Chambers

ABSTRACT
This specification covers requirements, test methods, materials, and marking for polypropylene (PP), open bottom, buried chambers of corrugated wall construction used for collection, detention, and retention of stormwater runoff. Applications include commercial, residential, agricultural, and highway drainage, including installation under parking lots and roadways. Chambers are produced in arch shapes with dimensions based on chamber rise, chamber span, and wall stiffness. They are manufactured with integral feet that provide base support. They may include perforations to enhance water flow and must meet test requirements for arch stiffness, flattening, and accelerated weathering. The successful performance of the product depends upon the type and depth of bedding and backfill, and care in installation. This specification includes requirements for the manufacturer to provide chamber installation instructions to the purchaser.
SCOPE
1.1 This specification covers requirements, test methods, materials, and marking for polypropylene (PP), open bottom, buried chambers of corrugated wall construction used for collection, detention, and retention of stormwater runoff. Applications include commercial, residential, agricultural, and highway drainage, including installation under parking lots and roadways.  
1.2 Chambers are produced in arch shapes with dimensions based on chamber rise, chamber span, and wall stiffness. Chambers are manufactured with integral feet that provide base support. Chambers may include perforations to enhance water flow. Chambers must meet test requirements for arch stiffness, flattening, and accelerated weathering.  
1.3 Analysis and experience have shown that the successful performance of this product depends upon the type and depth of bedding and backfill, and care in installation. This specification includes requirements for the manufacturer to provide chamber installation instructions to the purchaser.  
1.4 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.  
1.5 This standard does not purport to address water quality issues or hydraulic performance requirements associated with its use. It is the responsibility of the user to ensure that appropriate engineering analysis is performed to evaluate the water quality issues and hydraulic performance requirements for each installation.  
1.6 The following safety hazards caveat pertains only to the test method portion, Section 6, of this specification:  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.  
1.7 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.

General Information

• Status: Published
• Publication Date: 31-Aug-2023
• ICS: 83.140.01 - Rubber and plastics products in general
• Technical Committee: F17 - Plastic Piping Systems
• Drafting Committee: F17.65 - Land Drainage

Relations

• Replaces: ASTM F2418-19 - Standard Specification for Polypropylene (PP) Corrugated Wall Stormwater Collection Chambers
• Effective Date: 01-Sep-2023
• Refers: ASTM D4101-24 - Standard Classification System and Basis for Specification for Polypropylene Injection and Extrusion Materials
• Effective Date: 01-Feb-2024
• Refers: ASTM D1600-18 - Standard Terminology for Abbreviated Terms Relating to Plastics (Withdrawn 2024)
• Effective Date: 01-Jan-2018
• Refers: ASTM D4101-17e1 - Standard Classification System and Basis for Specification for Polypropylene Injection and Extrusion Materials
• Effective Date: 01-Dec-2017
• Referred By: ASTM F2787-13(2018) - Standard Practice for Structural Design of Thermoplastic Corrugated Wall Stormwater Collection Chambers
• Effective Date: 01-Sep-2023

Overview

ASTM F2418-23 is the current international standard specification for polypropylene (PP) corrugated wall stormwater collection chambers. These open-bottom, buried chambers are used for the collection, detention, and retention of stormwater runoff, providing effective on-site water management solutions across commercial, residential, agricultural, and highway drainage sites. The standard establishes requirements for materials, manufacturing, test methods, marking, and installation practices to ensure the performance, durability, and structural integrity of PP stormwater chambers.

By adhering to ASTM F2418-23, manufacturers, engineers, and contractors can ensure that polypropylene corrugated wall chambers meet stringent criteria for long-term underground use, even under vehicular traffic such as parking lots and roadways.

Key Topics

• Scope and Application: The specification covers design and performance requirements for filled and perforated polypropylene chambers of various arch profiles and sizes. It outlines their use in a range of stormwater management applications.

• Material Requirements: Chambers must be made from virgin or rework polypropylene materials conforming to ASTM D4101, with strict minimum performance values for tensile strength, flexural modulus, and impact resistance.

• Design and Manufacturing:

  • Arch-shaped, corrugated wall chambers with integral feet for base support
  • Optional features such as perforations to enhance infiltration/exfiltration and access ports for inspection
  • End caps to terminate rows and prevent backfill intrusion

• Physical and Mechanical Properties:

  • Specified values for wall thickness, chamber rise and span, foot width, and arch stiffness constant
  • Requirements for resistance to creep rupture and long-term deformation
  • Performance in flattening and accelerated weathering tests

• Testing and Quality Assurance:

  • Measurement procedures and laboratory conditioning protocols
  • Marking requirements, including manufacturer identification and production codes
  • Certification, sampling, and inspection protocols to verify compliance

• Installation Guidance: Manufacturers must provide detailed installation instructions and loading limits for various soil and traffic conditions to support long-term system functionality.

Applications

ASTM F2418-23 stormwater collection chambers are widely implemented in projects demanding efficient on-site stormwater management, including:

• Commercial Developments: Managing surface runoff under parking lots, loading docks, and commercial plazas.
• Residential Areas: Integrating below lawns, driveways, and landscaped areas to help control localized flooding and support groundwater recharge.
• Agriculture: Supporting field and farm drainage systems where robust, subsurface water management is required.
• Roadway and Highway Infrastructure: Installed below roadways and shoulders to collect and retain runoff, reducing surface flow and potential erosion.
• Green Infrastructure: Used as components in Low Impact Development (LID) projects to promote infiltration and sustainable water practices.

Proper selection, installation, bedding, and backfill procedures are essential to ensure the chambers’ structural performance over their service life under typical earth and live loads.

Related Standards

Designers and suppliers working with ASTM F2418-23 should also be familiar with relevant standards that support testing, materials, and installation:

• ASTM D4101 - Specification for PP injection/extrusion materials
• ASTM D638, D790, D256 - Test methods for mechanical properties of plastics
• ASTM D2412 - Test method for parallel-plate loading characteristics
• ASTM D4329 - Practice for accelerated UV exposure of plastics
• ASTM F2787 - Structural design of thermoplastic stormwater chambers
• ASTM F412 & D1600 - Plastics terminology and abbreviations

For complete stormwater management performance, ASTM F2418-23 should be integrated into broader engineering analysis, ensuring that hydraulic and water quality objectives are addressed alongside structural compliance.

Keywords: ASTM F2418-23, polypropylene chamber, stormwater detention, corrugated wall, drainage, retention, underground, sub-surface, installation, arch stiffness, PP, LID, green infrastructure.

Standards Content (Sample)

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.
Designation: F2418 − 23
Standard Specification for
Polypropylene (PP) Corrugated Wall Stormwater Collection
Chambers
This standard is issued under the fixed designation F2418; 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* environmental practices and determine the applicability of
regulatory limitations prior to use.
1.1 This specification covers requirements, test methods,
1.7 This international standard was developed in accor-
materials, and marking for polypropylene (PP), open bottom,
dance with internationally recognized principles on standard-
buried chambers of corrugated wall construction used for
ization established in the Decision on Principles for the
collection, detention, and retention of stormwater runoff. Ap-
Development of International Standards, Guides and Recom-
plications include commercial, residential, agricultural, and
mendations issued by the World Trade Organization Technical
highway drainage, including installation under parking lots and
Barriers to Trade (TBT) Committee.
roadways.
1.2 Chambers are produced in arch shapes with dimensions
2. Referenced Documents
based on chamber rise, chamber span, and wall stiffness.
2.1 ASTM Standards:
Chambers are manufactured with integral feet that provide base
D256 Test Methods for Determining the Izod Pendulum
support. Chambers may include perforations to enhance water
Impact Resistance of Plastics
flow. Chambers must meet test requirements for arch stiffness,
D618 Practice for Conditioning Plastics for Testing
flattening, and accelerated weathering.
D638 Test Method for Tensile Properties of Plastics
1.3 Analysis and experience have shown that the successful
D790 Test Methods for Flexural Properties of Unreinforced
performance of this product depends upon the type and depth
and Reinforced Plastics and Electrical Insulating Materi-
of bedding and backfill, and care in installation. This specifi-
als
cation includes requirements for the manufacturer to provide
D1600 Terminology for Abbreviated Terms Relating to Plas-
chamber installation instructions to the purchaser.
tics
D2122 Test Method for Determining Dimensions of Ther-
1.4 The values stated in inch-pound units are to be regarded
moplastic Pipe and Fittings
as standard. The values given in parentheses are mathematical
D2412 Test Method for Determination of External Loading
conversions to SI units that are provided for information only
Characteristics of Plastic Pipe by Parallel-Plate Loading
and are not considered standard.
D2990 Test Methods for Tensile, Compressive, and Flexural
1.5 This standard does not purport to address water quality
Creep and Creep-Rupture of Plastics
issues or hydraulic performance requirements associated with
D4101 Classification System and Basis for Specification for
its use. It is the responsibility of the user to ensure that
Polypropylene Injection and Extrusion Materials
appropriate engineering analysis is performed to evaluate the
D4329 Practice for Fluorescent Ultraviolet (UV) Lamp Ap-
water quality issues and hydraulic performance requirements
paratus Exposure of Plastics
for each installation.
D6992 Test Method for Accelerated Tensile Creep and
1.6 The following safety hazards caveat pertains only to the
Creep-Rupture of Geosynthetic Materials Based on Time-
test method portion, Section 6, of this specification: This
Temperature Superposition Using the Stepped Isothermal
standard does not purport to address all of the safety concerns,
Method
if any, associated with its use. It is the responsibility of the user
F412 Terminology Relating to Plastic Piping Systems
of this standard to establish appropriate safety, health, and
F2787 Practice for Structural Design of Thermoplastic Cor-
rugated Wall Stormwater Collection Chambers
This specification is under the jurisdiction of ASTM Committee F17 on Plastic
Piping Systems and is the direct responsibility of Subcommittee F17.65 on Land
Drainage. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2023. Published September 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2004. Last previous edition approved in 2019 as F2418-19. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/F2418-23. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2418 − 23
3. Terminology 3.1.12 rise—the vertical distance from the chamber base
(bottom of the chamber foot) to the inside of a chamber wall
3.1 Definitions:
valley element at the crown as depicted in Fig. 1.
3.1.1 Definitions used in this specification are in accordance
3.1.13 span—the horizontal distance from the interior of
with the definitions in Terminology F412, and abbreviations
one sidewall valley element to the interior of the other sidewall
are in accordance with Terminology D1600, unless otherwise
valley element as depicted in Fig. 1.
indicated.
3.1.2 chamber—an arch-shaped structure manufactured of
3.1.14 valley—the element of a corrugated wall located at
thermoplastic with an open-bottom that is supported on feet
the interior surface of the chamber wall, spanning between two
and may be joined into rows that begin with, and are termi-
webs (see Fig. 2).
nated by, end caps (see Fig. 1).
3.1.15 web—the element of a corrugated wall that connects
3.1.3 corrugated wall—a wall profile consisting of a regular
a crest element to a valley element (see Fig. 2).
pattern of alternating crests and valleys (see Fig. 2).
4. Materials and Manufacture
3.1.4 crest—the element of a corrugation located at the
4.1 This specification covers chambers made from virgin
exterior surface of the chamber wall, spanning between two
and rework PP plastic materials as defined by material me-
web elements (see Fig. 2).
chanical requirements and chamber performance requirements.
3.1.5 crown—the center section of a chamber typically
4.2 Polypropylene materials may be combined with
located at the highest point as the chamber is traversed
copolymers, pigments, and impact modifiers which together
circumferentially.
are suitable for manufacture. Manufactured chamber and end
3.1.6 end cap—a bulkhead provided to begin and terminate
cap material shall meet or exceed the requirements of desig-
a chamber, or row of chambers, and prevent intrusion of
nation PP0330B99945, Specification D4101. The minimum
surrounding embedment materials.
amount of polypropylene plastic in the material shall be 95 %
3.1.7 foot—a flat, turned out section that is manufactured
by weight. The minimum tensile stress at yield, Test Method
with the chamber to provide a bearing surface for transfer of
D638, shall not be less than 3100 psi (21 MPa). The minimum
vertical loads to the bedding (see Fig. 1).
flexural modulus (1 % secant), Test Method D790, Procedure
3.1.8 inspection port—an opening in the chamber wall that A, shall not be less than 145 000 psi (1000 MPa). The
allows access to the chamber interior. minimum Izod Impact Resistance at 73°F (23 °C), Method A in
Test Method D256, shall not be less than 4 ft-lb/in. (215 J/m).
3.1.9 nominal height—a designation describing the approxi-
Materials shall meet the creep requirements in 5.3.5 and 5.3.6
mate vertical dimension of the chamber at its crown (see Fig.
of this standard.
1).
NOTE 1—The polypropylene melt flow rate is specified for chamber
3.1.10 nominal width—a designation describing the ap-
manufacture by injection molding. The melt flow rate may be less than 10
proximate outside horizontal dimension of the chamber at its
if the manufactured chamber meets all other requirements in this standard.
feet (see Fig. 1).
This cell class will be re-evaluated when new chamber classifications are
added to Table 1.
3.1.11 period—the length of a single repetition of the
NOTE 2—Polypropylene plastic is prepared by the polymerization of
repeated corrugation, defined as the distance from the center-
propylene or propylene with other alpha olefins as described in Specifi-
line of a valley element to the centerline of the next valley
cation D4101.
element (see Fig. 2).
4.3 Rework Material—Clean rework material generated
from the manufacturer’s own chambers may be used by the
same manufacturer, using the same type and grade resin,
provided that the chambers produced meet all the requirements
of this specification.
5. Requirements
5.1 Chamber Description
5.1.1 Chambers shall be produced in arch shapes symmetric
about the crown with corrugated wall and integral feet for base
support (see Fig. 1). Any arch shape is acceptable provided all
the requirements of this specification are met.
NOTE 3—For purposes of structural optimization, the wall geometry
(for example, corrugation height, crest width, valley width, and web pitch)
may vary around the chamber circumference.
5.1.2 Chambers shall be produced with maximum span at
the base of the chamber (bottom of the chamber foot).
NOTE 1—The model chamber shown in this standard is intended only as
5.1.3 Chambers may include access ports for inspection or
a general illustration. Any chamber configuration is permitted, as long as
cleanout. Chambers with access ports shall meet the require-
it meets all the specified requirements of this standard.
FIG. 1 Model Chamber ments of this standard with access ports open and closed.
F2418 − 23
NOTE 1—The corrugation profile shown in this standard is intended only as a general illustration. Any corrugation pattern is permitted, as long as it
meets all the specified test requirements of this standard.
FIG. 2 Model Corrugated Wall
TABLE 1 Classifications, Dimensions, and Tolerances
Wall Minimum
Minimum
Chamber Nominal Nominal Thickness Arch
B
Designation Rise Span Foot
Classification Height Width Stiffness
Width
A
Average Minimum
Constant
Average Tolerance Average Tolerance ±
in. (mm) ± in. (mm) in (mm)
in. (mm) in. (mm) in (mm) in. (mm) in. (mm) in. (mm) lb/ft/%
12×25 . 12 (305) 25 (635) 9.8 (249) 0.4 (10) 15.3 (389) 0.4 (10) 4.0 (100) 0.150 (3.8) 0.140 (3.5) 300
16×33 . 16 (406) 33 (838) 13.5 (343) 1.0 (25) 25.0 (635) 1.0 (25) 4.0 (100) 0.130 (3.3) 0.120 (3.0) 300
30×51 . 30 (762) 51 (1295) 27.0 (686) 1.0 (25) 43.3 (1100) 1.1 (28) 4.0 (100) 0.180 (4.6) 0.165 (4.2) 300
33×50 . 33 (838) 50 (1270) 30.0 (762) 1.0 (25) 40.5 (1029) 1.1 (28) 4.0 (100) 0.190 (4.8) 0.165 (4.2) 300
45×76 SS 45 (1143) 76 (1930) 40.5 (1029) 1.0 (25) 64.0 (1626) 1.6 (41) 5.0 (127) 0.225 (5.7) 0.205 (5.2) 250
45×76 LS 45 (1143) 76 (1930) 41.0 (1041) 1.0 (25) 67.0 (1702) 1.6 (41) 5.0 (127) 0.225 (5.7) 0.205 (5.2) 250
60 ×101 . 60 (1524) 101 (2565) 54.0 (1372) 1.4 (34) 84.5 (2146) 2.1 (54) 8.0 (203) 0.245 (6.2) 0.225 (5.7) 250
A
The values for arch stiffness should not be considered comparable to values of pipe stiffness.
B
The designation indicates production tolerances of chamber variations within the same classification group.
5.1.4 Chambers may include perforations. Perforations shall 5.3.1 Wall Thickness—Chambers shall have minimum and
be cleanly fabricated in a size, shape, and pattern determined average wall thicknesses not less than the minimum wall
by the manufacturer. Chambers with perforations shall meet thicknesses shown in Table 1 when measured in accordance
the requirements of this standard. with 6.2.1.
5.1.5 Chamber sections shall be manufactured to connect at
5.3.2 Minimum Foot Width—Chambers shall have a foot
the ends to provide rows of various lengths. Joints shall be width not less than the minimum foot width as shown in Table
configured to prevent intrusion of the surrounding embedment
1 when measured in accordance with 6.2.2 (see also Fig. 1).
material and shall be capable of carrying the full load for which
5.3.3 Rise and Span Dimensions—Chambers shall meet the
the chamber is designed.
rise and span dimension requirements shown in Table 1 when
5.1.6 Each row of chambers shall begin and terminate with
measured in accordance with 6.2.3 and 6.2.4 (see also Fig. 1).
an end cap.
5.3.4 Deviation From Straightness—The chamber and its
5.1.7 Chamber classifications, dimensions, and tolerances
support feet shall not have a deviation from straightness greater
are provided in Table 1. Chamber classifications are based on
than L/100, where L is the length of an individual chamber,
the nominal height and nominal width of the chambers, as
when measured in accordance with 6.2.5.
illustrated in Fig. 1. Classifications shall be manufactured with
NOTE 4—This check is to be made at the time of manufacture and is
the specified rise and span with tolerances, minimum foot
included to prevent pre-installation deformations in a chamber that meets
width, and minimum wall thickness.
all other requirements of this standard.
5.2 Workmanship—The chambers shall be homogeneous
5.3.5 Creep Rupture Strength—Specimens fabricated in the
throughout and essentially uniform in color, opacity, density,
same manner and composed of the same materials, including
and other properties. The interior and exterior surfaces shall be
all additives, as the finished chambers shall have a 50 year
free of chalk
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
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: F2418 − 19 F2418 − 23
Standard Specification for
Polypropylene (PP) Corrugated Wall Stormwater Collection
Chambers
This standard is issued under the fixed designation F2418; 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 requirements, test methods, materials, and marking for polypropylene (PP), open bottom, buried
chambers of corrugated wall construction used for collection, detention, and retention of stormwater runoff. Applications include
commercial, residential, agricultural, and highway drainage, including installation under parking lots and roadways.
1.2 Chambers are produced in arch shapes with dimensions based on chamber rise, chamber span, and wall stiffness. Chambers
are manufactured with integral feet that provide base support. Chambers may include perforations to enhance water flow.
Chambers must meet test requirements for arch stiffness, flattening, and accelerated weathering.
1.3 Analysis and experience have shown that the successful performance of this product depends upon the type and depth of
bedding and backfill, and care in installation. This specification includes requirements for the manufacturer to provide chamber
installation instructions to the purchaser.
1.4 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.
1.5 This standard does not purport to address water quality issues or hydraulic performance requirements associated with its use.
It is the responsibility of the user to ensure that appropriate engineering analysis is performed to evaluate the water quality issues
and hydraulic performance requirements for each installation.
1.6 The following safety hazards caveat pertains only to the test method portion, Section 6, of this specification: 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.
1.7 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:
This specification is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.65 on Land Drainage.
Current edition approved Aug. 1, 2019Sept. 1, 2023. Published August 2019September 2023. Originally approved in 2004. Last previous edition approved in 20162019
as F2418-16a. DOI: 10.1520/F2418-19.-19. DOI: 10.1520/F2418-23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2418 − 23
D256 Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
D618 Practice for Conditioning Plastics for Testing
D638 Test Method for Tensile Properties of Plastics
D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
D1600 Terminology for Abbreviated Terms Relating to Plastics
D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings
D2412 Test Method for Determination of External Loading Characteristics of Plastic Pipe by Parallel-Plate Loading
D2990 Test Methods for Tensile, Compressive, and Flexural Creep and Creep-Rupture of Plastics
D4101 Classification System and Basis for Specification for Polypropylene Injection and Extrusion Materials
D4329 Practice for Fluorescent Ultraviolet (UV) Lamp Apparatus Exposure of Plastics
D6992 Test Method for Accelerated Tensile Creep and Creep-Rupture of Geosynthetic Materials Based on Time-Temperature
Superposition Using the Stepped Isothermal Method
F412 Terminology Relating to Plastic Piping Systems
F2787 Practice for Structural Design of Thermoplastic Corrugated Wall Stormwater Collection Chambers
F2418 − 23
3. Terminology
3.1 Definitions:
3.1.1 Definitions used in this specification are in accordance with the definitions in Terminology F412, and abbreviations are in
accordance with Terminology D1600, unless otherwise indicated.
3.1.2 chamber—an arch-shaped structure manufactured of thermoplastic with an open-bottom that is supported on feet and may
be joined into rows that begin with, and are terminated by, end caps (see Fig. 1).
3.1.3 corrugated wall—a wall profile consisting of a regular pattern of alternating crests and valleys (see Fig. 2).
3.1.4 crest—the element of a corrugation located at the exterior surface of the chamber wall, spanning between two web elements
(see Fig. 2).
3.1.5 crown—the center section of a chamber typically located at the highest point as the chamber is traversed circumferentially.
3.1.6 end cap—a bulkhead provided to begin and terminate a chamber, or row of chambers, and prevent intrusion of surrounding
embedment materials.
3.1.7 foot—a flat, turned out section that is manufactured with the chamber to provide a bearing surface for transfer of vertical
loads to the bedding (see Fig. 1).
3.1.8 inspection port—an opening in the chamber wall that allows access to the chamber interior.
3.1.9 nominal height—a designation describing the approximate vertical dimension of the chamber at its crown (see Fig. 1).
3.1.10 nominal width—a designation describing the approximate outside horizontal dimension of the chamber at its feet (see Fig.
1).
3.1.11 period—the length of a single repetition of the repeated corrugation, defined as the distance from the centerline of a valley
element to the centerline of the next valley element (see Fig. 2).
3.1.12 rise—the vertical distance from the chamber base (bottom of the chamber foot) to the inside of a chamber wall valley
element at the crown as depicted in Fig. 1.
3.1.13 span—the horizontal distance from the interior of one sidewall valley element to the interior of the other sidewall valley
element as depicted in Fig. 1.
NOTE 1—The model chamber shown in this standard is intended only as a general illustration. Any chamber configuration is permitted, as long as it
meets all the specified requirements of this standard.
FIG. 1 Model Chamber
F2418 − 23
NOTE 1—The corrugation profile shown in this standard is intended only as a general illustration. Any corrugation pattern is permitted, as long as it
meets all the specified test requirements of this standard.
FIG. 2 Model Corrugated Wall
3.1.14 valley—the element of a corrugated wall located at the interior surface of the chamber wall, spanning between two webs
(see Fig. 2).
3.1.15 web—the element of a corrugated wall that connects a crest element to a valley element (see Fig. 2).
4. Materials and Manufacture
4.1 This specification covers chambers made from virgin and rework PP plastic materials as defined by material mechanical
requirements and chamber performance requirements.
4.2 Polypropylene materials may be combined with copolymers, pigments, and impact modifiers which together are suitable for
manufacture. Manufactured chamber and end cap material shall meet or exceed the requirements of designation PP0330B99945,
Specification D4101. The minimum amount of polypropylene plastic in the material shall be 95 % by weight. The minimum tensile
stress at yield, Test Method D638, shall not be less than 3 100 3100 psi (21 MPa). The minimum flexural modulus (1 % secant),
Test Method D790, Procedure A, shall not be less than 145 000 psi (1 000 (1000 MPa). The minimum Izod Impact Resistance at
73 ºF (23 ºC), 73°F (23 °C), Method A in Test Method D256, shall not be less than 4 ft-lb/in. (215 J/m). Materials shall meet the
creep requirements in 5.3.5 and 5.3.6 of this standard.
NOTE 1—The polypropylene melt flow rate is specified for chamber manufacture by injection molding. The melt flow rate may be less than 10 if the
manufactured chamber meets all other requirements in this standard. This cell class will be re-evaluated when new chamber classifications are added to
Table 1.
NOTE 2—Polypropylene plastic is prepared by the polymerization of propylene or propylene with other alpha olefins as described in Specification D4101.
TABLE 1 Classifications, Dimensions, and Tolerances
Wall Minimum
Minimum
Chamber Nominal Nominal Thickness Arch
B
Designation Rise Span Foot
Classification Height Width Stiffness
Width
A
Average Minimum
Constant
Average Tolerance Average Tolerance ±
in. (mm) ± in. (mm) in (mm)
in. (mm) in. (mm) in (mm) in. (mm) in. (mm) in. (mm) lb/ft/%
12×25 . 12 (305) 25 (635) 9.8 (249) 0.4 (10) 15.3 (389) 0.4 (10) 4.0 (100) 0.150 (3.8) 0.140 (3.5) 300
16×33 . 16 (406) 33 (838) 13.5 (343) 1.0 (25) 25.0 (635) 1.0 (25) 4.0 (100) 0.130 (3.3) 0.120 (3.0) 300
30×51 . 30 (762) 51 (1295) 27.0 (686) 1.0 (25) 43.3 (1100) 1.1 (28) 4.0 (100) 0.180 (4.6) 0.165 (4.2) 300
33×50 . 33 (838) 50 (1270) 30.0 (762) 1.0 (25) 40.5 (1029) 1.1 (28) 4.0 (100) 0.190 (4.8) 0.165 (4.2) 300
45×76 SS 45 (1143) 76 (1930) 40.5 (1029) 1.0 (25) 64.0 (1626) 1.6 (41) 5.0 (127) 0.225 (5.7) 0.205 (5.2) 250
45×76 LS 45 (1143) 76 (1930) 41.0 (1041) 1.0 (25) 67.0 (1702) 1.6 (41) 5.0 (127) 0.225 (5.7) 0.205 (5.2) 250
60 ×101 . 60 (1524) 101 (2565) 54.0 (1372) 1.4 (34) 84.5 (2146) 2.1 (54) 8.0 (203) 0.245 (6.2) 0.225 (5.7) 250
A
The values for arch stiffness should not be considered comparable to values of pipe stiffness.
B
The The designation indicates production tolerances of chamber variations within the same classification group.
F2418 − 23
4.3 Rework Material—Clean rework material generated from the manufacturer’s own chambers may be used by the same
manufacturer, using the same type and grade resin, provided that the chambers produced meet all the requirements of this
specification.
5. Requirements
5.1 Chamber Description
5.1.1 Chambers shall be produced in arch shapes symmetric about the crown with corrugated wall and integral feet for base
support (see Fig. 1). Any arch shape is acceptable provided all the requirements of this specification are met.
NOTE 3—For purposes of structural optimization, the wall geometry (for example, corrugation height, crest width, valley width, and web pitch) may vary
around the chamber circumference.
5.1.2 Chambers shall be produced with maximum span at the base of the chamber (bottom of the chamber foot).
5.1.3 Chambers may include access ports for inspection or cleanout. Chambers with access ports shall meet the requirements of
this standard with access ports open and closed.
5.1.4 Chambers may include perforations. Perforations shall be cleanly fabricated in a size, shape, and pattern determined by the
manufacturer. Chambers with perforations shall meet the requirements of this standard.
5.1.5 Chamber sections shall be manufactured to connect at the ends to provide rows of various lengths. Joints shall be configured
to prevent intrusion of the surrounding embedment material and shall be capable of carrying the full load for which the chamber
is designed.
5.1.6 Each row of chambers shall begin and terminate with an end cap.
5.1.7 Chamber classifications, dimensions, and tolerances are provided in Table 1. Chamber classifications are based on the
nominal height and nominal width of the chambers, as illustrated in Fig. 1. Classifications shall be manufactured with the specified
rise and span with tolerances, minimum foot width, and minimum wall thickness.
5.2 Workmanship—The chambers shall be homogeneous throughout and essentially uniform in color, opacity, density, and other
properties. The interior and exterior surfaces shall be free of chalking, sticky, or tacky material. The chamber walls shall be free
of cracks, blisters, voids, foreign inclusions, or other defects that are visible to the naked eye and may affect the wall integrity.
5.3 Physical and Mechanical Properties of Finished Chamber:
5.3.1 Wall Thickness—Chambers shall have minimum and average wall thicknesses not less than the minimum wall thicknesses
shown in Table 1 when measured in accordance with 6.2.1.
5.3.2 Minimum Foot Width—Chambers shall have a foot width not less than the minimum foot width as shown in Table 1 when
measured in accordance with 6.2.2 (see also Fig. 1).
5.3.3 Rise and Span Dimensions—Chambers shall meet the rise and span dimension requirements shown in Table 1Table 1 when
measured in accordance with 6.2.3 and 6.2.4 (see also Fig. 1).
5.3.4 Deviation From Straightness—The chamber and its support feet shall not have a deviation from straightness greater than
L/100, where L is the length of an individual chamber, when measured in accordance with 6.2.5.
NOTE 4—This check
...