ASTM_D_2992_-_12.pdf

Designation:D299212An American National StandardStandard Practice forObtaining Hydrostatic or Pressure Design Basis for“Fiberglass”(Glass-Fiber-Reinforced Thermosetting-Resin)Pipe and Fittings1This standard is issued under the fixed designation D2992;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 practice establishes two procedures,Procedure A(cyclic)and Procedure B(static),for obtaining a hydrostaticdesign basis(HDB)or a pressure design basis(PDB)forfiberglass piping products,by evaluating strength-regressiondata derived from testing pipe or fittings,or both,of the samematerials and construction,either separately or in assemblies.Both glass-fiber-reinforced thermosetting-resin pipe(RTRP)and glass-fiber-reinforced polymer mortar pipe(RPMP)arefiberglass pipe.NOTE1For the purposes of this standard,polymer does not includenatural polymers.1.2 This practice can be used for the HDB determination forfiberglass pipe where the ratio of outside diameter to wallthickness is 10:1 or more.NOTE2This limitation,based on thin-wall pipe design theory,servesfurther to limit the application of this practice to internal pressures which,by the hoop-stress equation,are approximately 20%of the derivedhydrostatic design stress(HDS).For example,if HDS is 5000 psi(34 500kPa),the pipe is limited to about 1000-psig(6900-kPa)internal pressure,regardless of diameter.1.3 This practice provides a PDB for complex-shaped prod-ucts or systems where complex stress fields seriously inhibitthe use of hoop stress.1.4 Specimen end closures in the underlying test methodsmay be either restrained or free,leading to certain limitations.1.4.1 Restrained EndsSpecimens are stressed by internalpressure only in the hoop direction,and the HDB is applicablefor stresses developed only in the hoop direction.1.4.2 Free EndsSpecimens are stressed by internal pres-sure in both hoop and longitudinal directions,such that thehoop stress is twice as large as the longitudinal stress.Thispractice may not be applicable for evaluating stresses inducedby loadings where the longitudinal stress exceeds 50%of theHDS.1.5 The values stated in inch-pound units are to be regardedas the standard.The values in parentheses are given forinformation purposes only.NOTE3There is no known ISO equivalent to this 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.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1598 Test Method for Time-to-Failure of Plastic PipeUnder Constant Internal PressureD1599 Test Method for Resistance to Short-Time HydraulicPressure of Plastic Pipe,Tubing,and FittingsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2143 Test Method for Cyclic Pressure Strength ofReinforced,Thermosetting Plastic PipeD3567 Practice for Determining Dimensions of“Fiberglass”(Glass-Fiber-Reinforced Thermosetting Resin)Pipe andFittingsF412 Terminology Relating to Plastic Piping SystemsF948 Test Method for Time-to-Failure of Plastic PipingSystems and Components Under Constant Internal Pres-sure With Flow2.2 ISO Standard:3 Preferred NumbersSeries of Preferred Numbers31This practice is under the jurisdiction of ASTM Committee D20 on Plasticsandis the direct responsibility of Subcommittee D20.23 on Reinforced Plastic PipingSystems and Chemical Equipment.Current edition approved April 1,2012.Published May 2012.Originallyapproved in 1971.Last previous edition approved in 2006 as D2992 06.DOI:10.1520/D2992-12.2For 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 American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.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 States1 3.Terminology3.1 Definitions:3.1.1 GeneralDefinitions are in accordance with Termi-nologies D883 and F412,and abbreviations are in accordancewith Terminology D1600,unless otherwise indicated.3.1.2 closure,free-enda sealing device or mechanismfastened to the end of the test specimen so that internal pressureproduces longitudinal tensile stresses in addition to hoop andradial stresses in the test specimen.3.1.3 closure,restrained-enda sealing device or mecha-nism which relies on a ro