1、Designation: D 2925 01 (Reapproved 2007)e1An 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 D 2925; the number immediately following the design
2、ation 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 (e) indicates an editorial change since the last revision or reapproval.e1NOTENote 2 was revised editorially in Apr
3、il 2007.1. Scope*1.1 This test method covers measurement of the deflectionas a function 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) an
4、d glass-fiber-reinforced polymer mortar pipe (RPMP) are fiberglass pipes.NOTE 1For the purposes 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 thi
5、s test method are repre-sentative only of piping supported as a simple beam under fullbore flow 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.NOT
6、E 2There is no known ISO equivalent to this standard.1.5 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 o
7、f regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C33 Specification for Concrete AggregatesD 883 Terminology Relating to PlasticsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 3567 Practice for Determining Dimensions of “Fiber-glass” (Glass-Fiber-Reinfor
8、ced Thermosetting Resin) Pipeand FittingsF 412 Terminology Relating to Plastic Piping Systems3. Terminology3.1 GeneralDefinitions are in accordance with Terminolo-gies D 883 and F 412 and abbreviations are in accordance withTerminology D 1600, unless otherwise indicated.3.2 Definitions of Terms Spec
9、ific to This Standard:3.2.1 aggregatea siliceous sand conforming to the re-quirements of Specification C33, except 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
10、composite structure may containaggregate, granular or platelet fillers, thixotropic agents, pig-ments, or dyes; thermoplastic or thermosetting liners may beincluded.3.2.3 reinforced thermosetting resin pipe (RTRP)a fiber-glass pipe without aggregate.3.2.4 reinforced polymer mortar pipe (RPMP)a fiber
11、glasspipe with aggregate.4. Significance and Use4.1 In the absence of deflection measurements from actualinstalled-above-ground piping, this test method may be used toevaluate the influence of span length on mid-span deflections atdiffering temperatures under full bore flow.NOTE 3A flat bearing area
12、, small contact area, and narrow bearingwidth may induce high localized support interaction stresses, and con-straints imposed by 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
13、two uprights of a convenient height. Theuprights are to be spaced at a predetermined distance over1This test method is under the jurisdiction ofASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.23 on Reinforced PlasticPiping Systems and Chemical Equipment.Current edi
14、tion approved March 1, 2007. Published April 2007. Originallyapproved in 1970. Last previous edition approved in 2001 as D 2925 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informa
15、tion, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.which deflection is to be determined as shown on
16、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.5.1.1 The support space distance shall be estimated for amaximum allowable sag of 12.7 mm (12 in.) at test conditions.This estimate may be mad
17、e by solving Eq 1 for L, using y=12.7 mm (12 in.) 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 spec
18、imen, the wateremerging from the specimen shall be maintained continuouslyat the controlled temperature within 62C (3.6F). The watershall be fed into the specimen at a head not exceeding 1.5 m (5ft) and allowed to flow through it under such conditions that thepipe specimen is filled with the control
19、led temperature water atall times. Any recirculation shall be vented to atmosphere. Aschematic drawing of the test setup is shown on Fig. 2.5.3 Flexible Connections for the ends of the pipe testspecimens, installed so as to produce negligible load on theends of the pipe.5.4 A Device for Measuring th
20、e Deflection of the pipespecimen to the nearest 0.025 mm (0.001 in.) with negligibleconstraint on the specimen. A recommended device is acathetometer as shown on Fig. 1.5.5 Time-Interval Measuring Device graduated in minutesor seconds.5.6 Temperature and Pressure Gages and suitable controldevices to
21、 maintain standard test conditions.6. Test Specimens6.1 The test specimens shall be sections of fiberglass pipecut to a precalculated span length plus two pipe diameters 6 13mm (60.5 in.), essentially straight and of a diameter and wallthickness to be specified.6.2 At least three specimens shall be
22、tested for any givenpipe size.7. Test Temperature7.1 The test temperature selected should be the maximumrecommended service temperature for the piping unless it isdesired to test the effects of temperature variation.8. Procedure8.1 Measure the total wall thickness, liner thickness, anddiameter of th
23、e pipe specimen in accordance with PracticeD 3567.8.2 Place the test specimen on the upright supports so thatthere is an overhang of one pipe diameter 613 mm (60.5 in.)on each end.8.3 Connect the test specimen to the water supply and outletsystem by means of supported flexible connectors.8.4 Fill th
24、e pipe test specimen with water at ambienttemperature and determine initial deflection.8.5 Circulate the test media (water) through the test speci-men until a steady-state temperature (see 5.2) is attained at thedesignated test temperature. Then take the initial elevatedtemperature deflection readin
25、g.FIG. 1 Schematic of Test Specimen SupportD 2925 01 (2007)e128.6 Measure the position of the base point and the point ofmaximum deflection at 15-min intervals for 1 h and then at 1-hintervals for 4 h.8.7 Continue to measure the position of the base point andthe point of maximum deflection at suitab
26、le time intervals until1000 h have elapsed or until the total maximum deflectionexceeds the allowable design limit of 12.7 mm (12 in.). If achange of deflection less than 0.025 mm (0.001 in.) occurs intwo consecutive 24-h periods after 1000 h elapsed time, the testmay be terminated. If the change in
27、 deflection is greater than0.025 mm (0.001 in.) in two consecutive 24-h periods after1000 hour elapsed time, the test should be continued until thedesign limit of 12.7 mm (12 in.) is reached or until a change ofdeflection less than 0.025 mm (0.001 in.) occurs in twoconsecutive 24-h periods. Record t
28、his equilibrium time andmaximum deflection.9. Calculation9.1 Calculate EI values from the data obtained, as follows:3EI 5 22.5wL4/y (1)where:w = combined weight of pipe and fluid at test temperature,lb/ft,L = span length, ft,y = maximum measured deflection, in.,E = apparent elastic modulus of pipe,
29、psi,I = 0.0491 (D4d4), cross-section moment of inertia ofpipe, in.4,D = average outer diameter of pipe, in., andd = average inner diameter of pipe, in.10. Report10.1 The report shall include the following:10.1.1 Test laboratory and supervisor of tests,10.1.2 Dates of test,10.1.3 Complete identificat
30、ion of the sample, includingmaterial, manufacturer, type, source, and previous history,10.1.4 Pipe dimensions, including nominal pipe size, mini-mum and average wall thickness, liner thickness, and theminimum and average outside diameter of each specimen,10.1.5 Number of specimens tested,10.1.6 Calc
31、ulated weight of pipe filled with water at testtemperature, pounds per foot,10.1.7 Type of support used and dimensions of support(width and saddle radius),10.1.8 Span length between supports used in test,10.1.9 Temperature of inlet and outlet water at equilibrium,10.1.10 Table of deflection in inche
32、s versus time in hours,and10.1.11 Calculated EI values.11. Precision and Bias11.1 Attempts to develop a precision and bias statement forthis method have not been successful. For this reason, data onprecision and bias cannot be given.412. Keywords12.1 beam deflection; fiberglass pipe; fullbore flow;
33、elasticmodulus3Crocker, Sabin, Piping Handbook, McGraw-Hill Book Co., NY, FourthEdition, 1945, p. 745.4Anyone wishing to participate in the development of precision and bias datashould contact the Chairman, Subcommittee D 20.23,ASTM International, 100 BarrHarbor Drive, PO Box C700, West Conshohocken
34、, PA, 19428-2959 .FIG. 2 Schematic of Test Set-up for Beam Deflection Test on PipeD 2925 01 (2007)e13SUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue, D2925-95(2000), that may impact the use of this standard.(1) Changed acronym, RP
35、MP, definition from reinforced plas-tic polymer mortar pipe to reinforced polymer mortar pipe.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determinat
36、ion of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withd
37、rawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your
38、 comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 2925 01 (2007)e14
