1、Designation: F2922 12Standard Specification forPolyethylene (PE) Corrugated Wall Stormwater CollectionChambers1This standard is issued under the fixed designation F2922; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l
2、ast revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers requirements, test methods,materials, and marking for polyethylene (PE), open bottom,buried a
3、rch-shaped chambers of corrugated wall constructionused for collection, detention, and retention of stormwaterrunoff. Applications include commercial, residential, agricul-tural, and highway drainage, including installation under park-ing lots and roadways.1.2 Chambers are produced in arch shapes wi
4、th dimensionsbased on chamber rise, chamber span, and wall stiffness.Chambers are manufactured with integral feet that provide basesupport. Chambers may include perforations to enhance waterflow. Chambers must meet test requirements for arch stiffness,flattening, and accelerated weathering.1.3 Analy
5、sis and experience have shown that the successfulperformance of this product depends upon the type and depthof bedding and backfill, and care in installation. This specifi-cation includes requirements for the manufacturer to providechamber installation instructions to the purchaser.1.4 The values st
6、ated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 The following safety hazards caveat pertains only to thetest method portion, Section 6, of this sp
7、ecification:This standard does not purport to address all of the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2. Referenc
8、ed Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD1600 Terminology for Abbreviated Terms Relating toPlasticsD2122 Test Method for Determining Dimensions of Ther-moplastic Pipe and FittingsD2412 Test Method for Determination of External LoadingCharacteristics of Plas
9、tic Pipe by Parallel-Plate LoadingD2990 Test Methods for Tensile, Compressive, and Flex-ural Creep and Creep-Rupture of PlasticsD3350 Specification for Polyethylene Plastics Pipe andFittings MaterialsD4329 Practice for Fluorescent UV Exposure of PlasticsD4703 Practice for Compression Molding Thermop
10、lasticMaterials into Test Specimens, Plaques, or SheetsD6992 Test Method for Accelerated Tensile Creep andCreep-Rupture of Geosynthetic Materials Based on Time-Temperature Superposition Using the Stepped IsothermalMethodF412 Terminology Relating to Plastic Piping SystemsF2136 Test Method for Notched
11、, Constant Ligament-Stress(NCLS) Test to Determine Slow-Crack-Growth Resistanceof HDPE Resins or HDPE Corrugated PipeF2787 Practice for Structural Design of Thermoplastic Cor-rugated Wall Stormwater Collection Chambers3. Terminology3.1 DefinitionsDefinitions used in this specification are inaccordan
12、ce with the definitions in Terminology F412, andabbreviations are in accordance with Terminology D1600,unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.3 chamberan arch-shaped structure manufactured ofthermoplastic with an open-bottom that is supported on feetand may b
13、e joined into rows that begin with, and are termi-nated by, end caps (see Fig. 1).3.4 chamber storage capacitythe bare chamber storagecapacity excluding storage in end caps, stone porosity, distri-bution piping or other distribution components.3.5 corrugated walla wall profile consisting of a regula
14、rpattern of alternating crests and valleys (see Fig. 2).3.6 crestthe element of a corrugation located at theexterior surface of the chamber wall, spanning between twoweb elements (see Fig. 2).1This specification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the dire
15、ct responsibility of Subcommittee F17.65 on LandDrainage.Current edition approved March 1, 2012. Published March 2012. DOI: 10.1520/F292212.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volum
16、e information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.7 crownthe center section of a chamber typically lo-cated at the highest point as the chamber is travers
17、ed circum-ferentially.3.8 end capa bulkhead provided to begin and terminate achamber, or row of chambers, and prevent intrusion of sur-rounding embedment materials.3.9 foota flat, turned out section that is manufactured withthe chamber to provide a bearing surface for transfer of verticalloads to th
18、e bedding (see Fig. 1).3.10 inspection portan opening in the chamber wall thatallows access to the chamber interior.3.11 nominal heighta designation describing the approxi-mate vertical dimension of the chamber at its crown (see Fig.1).3.12 nominal widtha designation describing the approxi-mate outs
19、ide horizontal dimension of the chamber at its feet(see Fig. 1).3.13 periodthe length of a single repetition of the re-peated corrugation, defined as the distance from the centerlineof a valley element to the centerline of the next valley element(see Fig. 2).3.14 risethe vertical distance from the c
20、hamber base(bottom of the chamber foot) to the inside of a chamber wallvalley element at the crown as depicted in Fig. 1.3.15 spanthe horizontal distance from the interior of onesidewall valley element to the interior of the other sidewallvalley element as depicted in Fig. 1.3.16 valleythe element o
21、f a corrugated wall located at theinterior surface of the chamber wall, spanning between twowebs (see Fig. 2).3.17 webthe element of a corrugated wall that connects acrest element to a valley element (see Fig. 2).4. Materials and Manufacture4.1 The chamber and end caps shall be made of virgin PEplas
22、tic compound meeting the requirements of SpecificationD3350 cell classification 516500C or 516500E, except that thecarbon black content shall not exceed 3%. Compounds thathave a higher cell classification in one or more properties shallbe permitted provided all other product requirements are met.For
23、 slow crack growth resistance, acceptance of resins shall bedetermined by using the notched constant ligament-stress(NCLS) test on a finished compounded resin according to theprocedure described in 6.2.11. The chamber sample shall beground and a test plaque made in accordance with PracticeD4703 Proc
24、edure C at a cooling rate of 15C/min (27F/min)and tested per 6.2.11. The average failure time of test speci-mens from plaques shall not be less than 100 h.The model chamber shown in this standard is intended only as a general illustration. Any arch-shape chamber configuration is permitted, as long a
25、s it meets all thespecified requirements of this standard.FIG. 1 Model ChamberThe 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 testrequirements of this standard.FIG. 2 Model Corrugat
26、ed WallF2922 1224.2 Rework MaterialIn lieu of virgin PE, clean reworkmaterial generated from the manufacturers own chambers maybe used, provided the material meets the cell class require-ments of 4.1.5. Requirements5.1 Chamber Description:5.1.1 Chambers shall be produced in arch shapes symmetricabou
27、t the crown with corrugated wall and integral or attachedfeet for base support (see Fig. 1). Any arch shape is acceptableprovided all the requirements of this specification are met.NOTE 1For purposes of structural optimization, the wall geometry(for example, corrugation height, crest width, valley w
28、idth, and web pitch)may vary around the chamber circumference.5.1.2 Chambers shall be produced with maximum span atthe base of the chamber (bottom of the chamber foot).5.1.3 Chambers may include access ports for inspection orcleanout. Chambers with access ports shall meet the require-ments of this s
29、tandard with access ports open and closed.5.1.4 Chambers may include provisions for hydraulic con-nections at various locations around the chamber. Chamberswith hydraulic connections through the chamber shall meet therequirements of this standard with hydraulic connections (1)closed and (2) with the
30、 hydraulic connection fitting installed.5.1.5 Chambers may include perforations. Perforations shallbe cleanly fabricated in a size, shape, and pattern determinedby the manufacturer. Chambers with perforations shall meetthe requirements of this standard.5.1.6 Chambers may include integral, repeating
31、end walls.Chambers with integral repeating end walls shall meet therequirements of this standard at all locations along the chamberlength. The chamber shall be capable of carrying the full loadfor which it was designed at all locations along the chamberlength.5.1.7 Chamber sections shall be manufact
32、ured to connect atthe ends to provide rows of various lengths. Joints shall beconfigured to prevent intrusion of the surrounding embedmentmaterial and shall be capable of carrying the full load for whichthe chamber is designed.5.1.8 Each row of chambers shall begin and terminate withan end cap. End
33、caps may be an integral part of the chamber ora separate component. End caps that are injection molded shallmeet the requirements of this standard.5.1.9 Chamber classifications, dimensions, and tolerancesare provided in Table 1. Chamber classifications are based onthe nominal height and nominal widt
34、h of the chambers, asillustrated in Fig. 1. Classifications shall be manufactured withthe specified rise and span with tolerances, minimum footwidth, and wall thickness requirements.NOTE 2The values for arch stiffness in Table 1 should not beconsidered comparable to values of pipe stiffness.5.2 Work
35、manshipThe chambers shall be homogeneousthroughout and essentially uniform in color, opacity, density,and other properties. The interior and exterior surfaces shall befree of chalking, sticky, or tacky material. The chamber wallsshall be free of cracks, blisters, voids, foreign inclusions, orother d
36、efects that are visible to the naked eye and may affectthe wall integrity.5.3 Physical and Mechanical Properties of Finished Cham-ber:5.3.1 Wall ThicknessChambers shall have minimum andaverage wall thicknesses not less than the wall thicknessesshown in Table 1 when measured in accordance with 6.2.1.
37、5.3.2 Minimum Foot WidthChambers shall have a footwidth not less than the minimum foot width as shown in Table1 when measured in accordance with 6.2.2 (see also Fig. 1).5.3.3 Rise and Span DimensionsChambers shall meetthe rise and span dimension requirements shown in Table 1when measured in accordan
38、ce with Sections 6.2.3 and 6.2.4(see also Fig. 1).5.3.4 Deviation From StraightnessThe chamber and itssupport feet shall not have a deviation from straightness greaterthan L/100, where L is the length of an individual chamber,when measured in accordance with 6.2.5.NOTE 3This check is to be made at t
39、he time of manufacture and isincluded to prevent pre-installation deformations in a chamber that meetsall other requirements of this standard.5.3.5 Storage CapacityManufacturers shall provide thestorage capacity of the bare chamber and end cap and a stagestorage table for the chamber and end cap. Re
40、ported valuesshall be based on components “as-assembled” to eliminatedouble counting storage at joints and end caps. Volumedetermination shall be in accordance with 6.2.6.5.3.6 Creep Rupture StrengthSpecimens fabricated in thesame manner and composed of the same materials including alladditives, as
41、the finished chambers shall have a 50 year creeprupture tensile strength at 73 F (23C) not less than 700 psi(4.8 MPa) when determined in accordance with 6.2.7.5.3.7 Creep ModulusSpecimens fabricated in the samemanner and composed of the same materials including alladditives, as the finished chambers
42、 shall have a 50 year tensilecreep modulus at 73 F (23C) of not less than 20,000 psi (138MPa) when tested at a stress level of 500 psi (3.5 MPa) or theTABLE 1 Chamber Classifications, Dimensions, and TolerancesChamberClassificationNominalHeightNominalWidthRise SpanMinimumFootWidthWallThicknessMinimu
43、m ArchStiffness ConstantAverage Tolerance 6 Average Tolerance 6 Average Tolerance 6in. (mm) in. (mm) in. (mm) in. (mm) in. (mm) in. (mm) in. (mm) in. (mm) in. (mm) lb/ft/%16333 16(406)33(838)13.1(333)0.4(10)24.3(617)0.4(10)4.0(100)0.130(3.3)0.120(3.0)30030351 30(762)51(1295)26.7(678)0.4(10)42.6(1082
44、)0.4(10)4.0(100)0.180(4.6)0.165(4.2)300F2922 123design service stress, whichever is greater. The creep modulusshall be determined in accordance with 6.2.8. The actual testderived creep modulus shall be used in the design of thechamber.NOTE 4The specified minimum modulus provides assurance of long-te
45、rm stiffness for a chamber resin. It does not provide assurance that allchambers manufactured with a resin of this stiffness will be adequate forall long-term load conditions. Structural calculations to demonstrateadequacy are still required in accordance with 5.5 and 5.6.2.NOTE 5The 50 year creep r
46、upture strength and 50 year creep modulusvalues, determined by the test methods in 6.2.7 and 6.2.8, are used todefine the slope of the logarithmic regression curves to describe therequired material properties sampled from the product. They are not to beinterpreted as service life limits.5.3.8 Arch S
47、tiffness ConstantChambers shall have an archstiffness constant (ASC) not less than the minimum archstiffness constant shown in Table 1 when determined inaccordance with 6.2.10.5.3.9 FlatteningChambers shall show neither splitting,cracking, or breaking under normal light and the unaided eyenor loss o
48、f load carrying capacity when tested in accordancewith 6.2.9.5.3.10 Slow Crack Growth Resistancecompressionmolded samples from the finished chamber shall exhibit anaverage failure time of not less than 100 hrs when tested forslow crack growth resistance in accordance with 6.2.11.5.4 Accelerated Weat
49、heringSpecimens fabricated in thesame manner and composed of the same materials as thefinished chambers shall meet all material requirements in 4.2after accelerated weathering described in 4.1.5.5 Design and Installation RequirementsChambers shallbe structurally designed in accordance with Practice F2787.The chamber manufacturer shall provide the purchaser with therequirements for the proper installation of chambers and theminimum and maximum allowable cover height for specifictraffic and non-traffic loading conditions that meet the requir
