1、Designation:D292514An American National StandardStandard Test Method forBeam Deflection of“Fiberglass”(Glass-Fiber-ReinforcedThermosetting Resin)Pipe Under Full Bore Flow1This standard is issued under the fixed designation D2925;the number immediately following the designation indicates the year ofo
2、riginal 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 measurement of the deflectionas a function
3、 of time of a specimen of fiberglass pipe supportedon a flat non-arced support as a simple beam under full boreflow of water at elevated temperatures.Both glass-fiber-reinforced thermosetting-resin pipe(RTRP)and glass-fiber-reinforced polymer mortar pipe(RPMP)are fiberglass pipes.NOTE1For the purpos
4、es of this standard,polymer does not includenatural polymers.1.2 This test method can be used to determine deflection atvarying conditions by substituting other test media.1.3 Deflections observed using this test method are repre-sentative only of piping supported as a simple beam under fullbore flo
5、w which has one diameter of pipe overhanging at eachsupport.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are provided forinformation purposes only.NOTE2There is no known ISO equivalent to this standard.1.5 This standard does not purport to addre
6、ss 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 f
7、or Concrete AggregatesD883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD3567 Practice for Determining Dimensions of“Fiberglass”(Glass-Fiber-Reinforced Thermosetting Resin)Pipe andFittingsF412 Terminology Relating to Plastic Piping Systems3.Terminology3
8、.1 GeneralDefinitions are in accordance with Terminolo-gies D883 and F412 and abbreviations are in accordance withTerminology D1600,unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 aggregatea siliceous sand conforming to the re-quirements of Specification C33,excep
9、t that the requirementsfor gradation shall not apply.3.2.2 fiberglass pipea tubular product containing glassfiber reinforcement embedded in or surrounded by curedthermosetting resin;the composite structure may containaggregate,granular or platelet fillers,thixotropic agents,pigments,or dyes;thermopl
10、astic or thermosetting liners maybe included.3.2.3 reinforced thermosetting resin pipe(RTRP)a fiber-glass pipe without aggregate.3.2.4 reinforced polymer mortar pipe(RPMP)a fiberglasspipe with aggregate.4.Significance and Use4.1 In the absence of deflection measurements from actualinstalled-above-gr
11、ound piping,this test method may be used toevaluate the influence of span length on mid-span deflections atdiffering temperatures under full bore flow.NOTE3A flat bearing area,small contact area,and narrow bearingwidth may induce high localized support interaction stresses,and con-straints imposed b
12、y the supports may also adversely influence deflectionsand performance of the pipe.5.Apparatus5.1 Rigid Support with edges rounded to a 6-mm(14-in.)radius,consisting of two uprights of a convenient height.Theuprights are to be spaced at a predetermined distance overwhich deflection is to be determin
13、ed as shown on Fig.1.Theuprights shall have lateral guides,a saddle,groove,or inden-tation on the top to keep the pipe specimen from rolling offwhen placed in position.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.23
14、 on Reinforced PlasticPiping Systems and Chemical Equipment.Current edition approved Aug.1,2014.Published August 2014.Originallyapproved in 1970.Last previous edition approved in 2007 as D2925 01(2007)1.DOI:10.1520/D2925-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact
15、 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 Conshohoc
16、ken,PA 19428-2959.United States1 5.1.1 The support space distance shall be estimated for amaximum allowable sag of 12.7 mm(12in.)at test conditions.This estimate may be made by solving Eq 1 for L,using y=12.7 mm(12in.)and assuming an elastic modulus,E=1 000 000 psi,unless a more accurate value is available.5.2 Source of Hot Water and a Feed System maintained atconditions such that when this source is coupled to the pipespecimen and the water is fed into the specimen,the wateremerging from the sp
