ASTM_D_3982_-_21.pdf

Designation:D398221Standard Specification forContact Molded“Fiberglass”(Glass Fiber ReinforcedThermosetting Resin)Ducts1This standard is issued under the fixed designation D3982;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year 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 ducts fabricated by contactmolding intended for use in handling corrosive fumes andprocess gases.Special attention is given to equipment thatoperates at temperatures over 180F(82.2C)with regard tostrength and corrosion resistance.1.2 The material of construction shall be“fiberglass”con-sisting of a polyester,vinyl ester,or other qualified resin-matrixsystems with fiber reinforcement in accordance with Specifi-cation C582.1.3 This specification is not intended to cover selection ofresins and reinforcements for specific chemical environments.1.4 This specification covers ducts up to a design pressureof 65 psig(34.5 Pa).1.5 The values stated 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.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE1There is no known ISO equivalent to this standard.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International 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 Liquid ServiceC582 Specification for Contact-Molded Reinforced Thermo-setting Plastic(RTP)Laminates for Corrosion-ResistantEquipmentD883 Terminology Relating to PlasticsD2583 Test Method for Indentation Hardness of Rigid Plas-tics by Means of a Barcol ImpressorD2584 Test Method for Ignition Loss of Cured ReinforcedResinsF412 Terminology Relating to Plastic Piping SystemsF436 Specification for Hardened Steel Washers(Metric)F0436_F0436M2.2 NFPA Standard:NFPA 91 Installation of Blower and Exhaust Systems forDuct,Stack and Vapor Removal or Conveying33.Terminology3.1 Definitions:3.1.1 The definitions used in this specification are in accor-dance with definitions in Terminologies D883 and F412,unlessotherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 calculated thicknessthis description is in accordancewith the standard laminate composition tables for Types I andII in Specification C582.3.2.2 contact moldingincludes the“hand layup”and the“spray up”methods of manufacture.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.23 on ReinforcedThermosetting Resin Piping Systems and Chemical Equipment.Current edition approved April 1,2021.Published April 2021.Originallyapproved in 1981.Last previous edition approved in 2014 as D3982 08(2014).DOI:10.1520/D3982-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from National Fire Protection Association(NFPA),1 BatterymarchPark,Quincy,MA 02169-7471,http:/www.nfpa.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.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.13.2.3 flange cantthe angle that an entire branch is off frombeing perpendicular to the main run centerline(see Fig.1).3.2.4 flange flatnessmaximum deviation,(see Fig.2)fromthe actual flange face not including warpage or perpendicular-ity.3.2.5 flange offsetthe amount that an entire branch is offthe main run centerline(see Fig.3).3.2.6flange perpendicularitymaximum angle that theplane(see Fig.2)of the flange inside diameter makes with theperpendicular plane to the ducts centerline.3.2.7 flange warpagethe amount that a flange outsidediameter pulls back from the plane of the inside diameterduring the cure of