ASTM_D_2924_-_12.pdf

Designation:D292412An American National StandardStandard Test Method forExternal Pressure Resistance of“Fiberglass”(Glass-Fiber-Reinforced Thermosetting-Resin)Pipe1This standard is issued under the fixed designation D2924;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 test method covers determination of the resistanceof fiberglass pipe to external pressure.It classifies failures asbuckling,compressive,and leaking.Both glass-fiber-reinforced thermosetting-resin pipe(RTRP)and glass-fiber-reinforced polymer mortar pipe(RPMP)are fiberglass pipes.NOTE1For the purposes of this standard,polymer does not includenatural polymers.1.2 The values stated in inch-pound units are to be regardedas standard.The SI units given in parentheses are for informa-tion only.NOTE2There is no similar or equivalent ISO standard.1.3 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:2C33 Specification for Concrete AggregatesD618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsF412 Terminology Relating to Plastic Piping Systems3.Terminology3.1 Definitions:3.1.1 Definitions are in accordance with Terminology D883or F412 and abbreviations are in accordance with TerminologyD1600,unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 aggregate,na siliceous sand conforming to therequirements of Specification C33,except that the require-ments for gradation shall not apply.3.2.2 buckling failure pressure the external gage pressureat which buckling occurs.Buckling is characterized by a sharpdiscontinuity in the pressure-volume change graph and subse-quent fracture in the test specimen appearing as an axiallyoriented crack.Buckling is an elastic instability type of failureand is normally associated with thin-wall pipe.3.2.3 compressive failure pressurethe maximum externalgage pressure that the specimen will resist without transmis-sion of the testing fluid through the wall.Compressive failurepressure will not be associated with a sharp discontinuity in thepressure-volume change graph nor lead to a fracture appearingas a sharp axially oriented crack.It will appear as a fracturewhich is the result of reaching the compressive strength limitsof the material and is normally associated with thick-wall pipe.Failure is usually identified by a sudden drop in pressure.3.2.4 fiberglass pipe,na tubular product containing glassfiber reinforcements embedded in or surrounded by curedthermosetting resin;the composite structure may containaggregate,granular,or platelet fillers,thixotropic agents,pigments,or dyes;thermoplastic or thermosetting liners orcoatings may be included.3.2.5 leaking pressurethe external gage pressure at whichthe test fluid is transmitted through the pipe wall.It ischaracterized in this test by continuous volume change indica-tions with no pressure increase.3.2.6 reinforced polymer mortar pipe(RPMP),na fiber-glass pipe with aggregate.3.2.7 reinforced thermosetting resin pipe(RTRP),na fi-berglass pipe without aggregate.4.Summary of Test Method4.1 This test method consists of loading a specimen tofailure in a short time interval by means of incrementallyincreasing external fluid pressure at a controlled constanttemperature.Fluid is also maintained inside the pipe,andchanges in the inside volume are monitored with a bleed holeand fluid level tube.On Cartesian coordinates,pressure versus1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.23 on Reinforced PlasticPiping Systems and Chemical Equipment.Current edition approved Oct.1,2012.Published November 2012.Originallyapproved in 1970.Last previous edition approved in 2006 as D2924 01(2006).DOI:10.1520/D2924-12.2For 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.*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 change in volume is plotted and the failure pressure selected asindicated by the graph.Scaling constants are presented forextending the results to other diameters.5.Significance and Use5.1 The values obtained by this test method are applicableonly to conditions that s