1、Designation:D375320Standard Specification forFiberglass(Glass-Fiber-Reinforced Thermosetting-Resin)Manholes and Wetwells1This standard is issued under the fixed designation D3753;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the ye
2、ar of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers“fiberglass”(glass fiber-reinforced thermosetting-resin)manholes and wetwells fabri-cated w
3、ith polyester,vinyl ester,or epoxy resin for useprimarily in sanitary,storm,and industrial sewer applications.1.2 The values given in inch-pound units are to be regardedas the standard.The values in parentheses are provided forinformation purposes only.1.3 The following precautionary caveat pertains
4、 only to thetest methods portion,Section 8,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety,health,andenvironmental practices and determine the
5、 applicability ofregulatory limitations prior to use.NOTE1There is no known ISO equivalent to this standard.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of Inte
6、rnational Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C581 Practice for Determining Chemical Resistance ofThermosetting Resins Used in Glass-Fiber-ReinforcedStructures Intended for Liq
7、uid ServiceD695 Test Method for Compressive Properties of RigidPlasticsD785 Test Method for Rockwell Hardness of Plastics andElectrical Insulating MaterialsD790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsD883 Terminology Relating t
8、o PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2412 Test Method for Determination of External LoadingCharacteristics of Plastic Pipe by Parallel-Plate LoadingD2583 Test Method for Indentation Hardness of Rigid Plas-tics by Means of a Barcol ImpressorD2584 Test Method for Igni
9、tion Loss of Cured ReinforcedResinsD3892 Practice for Packaging/Packing of Plastics3.Terminology3.1 GeneralDefinitions are in accordance with Terminol-ogy D883 and the abbreviations are in accordance withTerminology D1600 unless otherwise indicated.3.2 bench and invert,ninternal flow channel with a
10、slopedbench extending from the edge of the flow channel to themanhole wall designed to facilitate the flow of liquid throughthe manhole between the pipe connectors.3.3 bottom,na flat,domed,dished,or other shaped bottomdesigned to make the manhole or wetwell watertight at its base.3.4 expanded base m
11、anhole,na manhole with a largerdiameter base section and reduced diameter riser section.(SeeFig.1 for a typical manhole and an expanded base manhole.)3.5 expanded base reducer,na portion of the manhole,between the manway reducer and bottom,that changes fromone diameter to another in the cylindrical
12、portion of thestructure.3.6 manway reducer,nthe top portion of the manholethrough which entrance to the manhole is made and where thediameter increases from the entrance way to the larger manholecylinder.3.7 manhole,na constant diameter cylinder attached to amanway reducer designed to handle a manho
13、le cover and ring.3.8 manhole cover and frame,nthose accessories usedwith the manhole to close the manway entrance(includes gradeadjustment rings).1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.23 on ReinforcedTherm
14、osetting Resin Piping Systems and Chemical Equipment.Current edition approved Dec.1,2020.Published December 2020.Originallyapproved in 1979.Last previous edition approved in 2019 as D3753 19.DOI:10.1520/D3753-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Custom
15、er Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428
16、-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.13.9 manhole cylinder,nthe portion below the manwayreducer that extends in a constant diameter to the manholebase.3.10 pipe connectors,nconnectors that provide access
