1、Designation: D2925 01 (Reapproved 2007)1D2925 14 An 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
2、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 NOTENote 2 was revised editorially i
3、n April 2007.1. Scope*1.1 This test method covers measurement of the deflection as a function of time of a specimen of fiberglass pipe supported ona flat non-arced support as a simple beam under full bore flow of water at elevated temperatures. Both glass-fiber-reinforcedthermosetting-resin pipe (RT
4、RP) and glass-fiber-reinforced polymer mortar pipe (RPMP) are fiberglass pipes.NOTE 1For the purposes of this standard, polymer does not include natural polymers.1.2 This test method can be used to determine deflection at varying conditions by substituting other test media.1.3 Deflections observed u
5、sing this test method are representative only of piping supported as a simple beam under full boreflow which has one diameter of pipe overhanging at each support.1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for informationpurposes
6、 only.NOTE 2There is no known ISO equivalent to this standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applica
7、bility of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C33 Specification for Concrete AggregatesD883 Terminology Relating to PlasticsD1600 Terminology for Abbreviated Terms Relating to PlasticsD3567 Practice for Determining Dimensions of “Fiberglass” (Glass-Fiber-Rei
8、nforced Thermosetting Resin) Pipe and FittingsF412 Terminology Relating to Plastic Piping Systems3. Terminology3.1 GeneralDefinitions are in accordance with Terminologies D883 and F412 and abbreviations are in accordance withTerminology D1600, unless otherwise indicated.3.2 Definitions of Terms Spec
9、ific to This Standard:3.2.1 aggregatea siliceous sand conforming to the requirements of Specification C33, except that the requirements forgradation shall not apply.3.2.2 fiberglass pipea tubular product containing glass fiber reinforcement embedded in or surrounded by cured thermosettingresin; the
10、composite structure may contain aggregate, granular or platelet fillers, thixotropic agents, pigments, or dyes;thermoplastic or thermosetting liners may be included.1 This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.23
11、on Reinforced Plastic PipingSystems and Chemical Equipment.Current edition approved March 1, 2007Aug. 1, 2014. Published April 2007August 2014. Originally approved in 1970. Last previous edition approved in 20012007 asD2925 01.D2925 01 (2007)1. DOI: 10.1520/D2925-01R07E01.10.1520/D2925-14.2 For refe
12、rencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide t
13、he user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the stand
14、ard as published by ASTM is to be considered the official document.*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 States13.2.3 reinforced thermosetting resin pipe (RTRP)a fibe
15、rglass pipe without aggregate.3.2.4 reinforced polymer mortar pipe (RPMP)a fiberglass pipe with aggregate.4. Significance and Use4.1 In the absence of deflection measurements from actual installed-above-ground piping, this test method may be used toevaluate the influence of span length on mid-span d
16、eflections at differing temperatures under full bore flow.NOTE 3A flat bearing area, small contact area, and narrow bearing width may induce high localized support interaction stresses, and constraintsimposed by the supports may also adversely influence deflections and performance of the pipe.5. App
17、aratus5.1 Rigid Support with edges rounded to a 6-mm (14-in.) radius, consisting of two uprights of a convenient height. The uprightsare to be spaced at a predetermined distance over which deflection is to be determined as shown on Fig. 1. The uprights shall havelateral guides, a saddle, groove, or
18、indentation on the top to keep the pipe specimen from rolling off when placed in position.5.1.1 The support space distance shall be estimated for a maximum allowable sag of 12.7 mm (12 in.) at test conditions. Thisestimate may be made by solving Eq 1 for L, using y = 12.7 mm (12 in.) and assuming an
19、 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 at conditions such that when this source is coupled to the pipe specimenand the water is fed into the specimen, the water emerging from the specimen shall be maintained
20、continuously at the controlledtemperature within 62C (3.6F). The water shall be fed into the specimen at a head not exceeding 1.5 m (5 ft) (5 ft) and allowedto flow through it under such conditions that the pipe specimen is filled with the controlled temperature water at all times. Anyrecirculation
21、shall be vented to atmosphere. A schematic drawing of the test setup is shown on Fig. 2.5.3 Flexible Connections for the ends of the pipe test specimens, installed so as to produce negligible loadmoment on the endsof the pipe.5.4 A Device for Measuring the Deflection of the pipe specimen to the near
22、est 0.025 mm (0.001 in.) with negligible constrainton the specimen. A recommended device is a cathetometer as shown on Fig. 1.5.5 Time-Interval Measuring Device graduated in minutes or seconds.5.6 Temperature and Pressure Gages and suitable control devices to maintain standard test conditions.FIG. 1
23、 Schematic of Test Specimen SupportD2925 1426. Test Specimens6.1 The test specimens shall be sections of fiberglass pipe cut to a precalculated span length plus two pipe diameters 6 13 mm(60.5 in.), essentially straight and of a diameter and wall thickness to be specified.6.2 At least three specimen
24、s shall be tested for any given pipe size.7. Test Temperature7.1 The test temperature selected should be the maximum recommended service temperature for the piping unless it is desiredto test the effects of temperature variation.8. Procedure8.1 Measure the total wall thickness, liner thickness, and
25、diameter of the pipe specimen in accordance with Practice D3567.8.2 Place the test specimen on the upright supports so that there is an overhang of one pipe diameter 613 mm (60.5 in.) oneach end.8.3 Connect the test specimen to the water supply and outlet system by means of supported flexible connec
26、tors.8.4 Fill the pipe test specimen with water at ambient temperature and determine initial deflection.8.5 Circulate the test media (water) through the test specimen until a steady-state temperature (see 5.2) is attained at thedesignated test temperature. Then take the initial elevated temperature
27、deflection reading.8.6 Measure the position of the base point and the point of maximum 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 and the point of maximum deflection at suitable time intervals until 1000h have elapse
28、d or until the total maximum deflection exceeds the allowable design limit of 12.7 mm (12 in.). If a change ofdeflection less than 0.025 mm (0.001 in.) occurs in two consecutive 24-h periods after 1000 h elapsed time, the test may beterminated. If the change in deflection is greater than 0.025 mm (0
29、.001 in.) in two consecutive 24-h periods after 1000 hour elapsedtime, the test should be continued until the design limit of 12.7 mm (12 in.) is reached or until a change of deflection less than 0.025mm (0.001 in.) occurs in two consecutive 24-h periods. Record this equilibrium time and maximum def
30、lection.9. Calculation9.1 Calculate EI values from the data obtained, as follows:3EI5 22.5wL4 /y (1)where:w = combined weight of pipe and fluid at test temperature, lb/ft,3 Crocker, Sabin, Piping Handbook, McGraw-Hill Book Co., NY, Fourth Edition, 1945, p. 745.FIG. 2 Schematic of Test Set-up for Bea
31、m Deflection Test on PipeD2925 143L = span length, ft,y = maximum measured deflection, in.,E = apparent elastic modulus of pipe, psi,I = 0.0491 (D4 d4), cross-section moment of inertia of pipe, in.4,D = average outer diameter of pipe, in., andd = average inner diameter of pipe, in.10. Report10.1 The
32、 report shall include the following:10.1.1 Test laboratory and supervisor of tests,10.1.2 Dates of test,10.1.3 Complete identification of the sample, including material, manufacturer, type, source, and previous history,10.1.4 Pipe dimensions, including nominal pipe size, minimum and average wall thi
33、ckness, liner thickness, and the minimumand average outside diameter of each specimen,10.1.5 Number of specimens tested,10.1.6 Calculated weight of pipe filled with water at test temperature, pounds per foot,10.1.7 Type of support used and dimensions of support (width and saddle radius),10.1.8 Span
34、length between supports used in test,10.1.9 Temperature of inlet and outlet water at equilibrium,10.1.10 Table of deflection in inches versus time in hours, and10.1.11 Calculated EI values.10.1.12 Temperature of environment outside the pipe.11. Precision and Bias11.1 Attempts to develop a precision
35、and bias statement for this method have not been successful. For this reason, data onprecision and bias cannot be given.412. Keywords12.1 beam deflection; fiberglass pipe; fullbore flow; elastic modulusSUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard s
36、ince the last issue,D2925-95(2000)D2925 01 (2007)1, that may impact the use of this standard.(1) Changed acronym, RPMP, definition from reinforced plastic polymer mortar pipe to reinforced polymer mortar pipe.(1) Replaced the term “load” with “moment” in section 5.3.(2) Added requirement (10.1.12) t
37、o report temperature conditions of test laboratory.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 determination of the validity of any such patent righ
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40、ou 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 b
41、e 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ Anyone wishing to participate in the development of precision and bias data should contact the Chairman, Subcommittee D 20.23,ASTM International, 100 Barr HarborDrive, PO Box C700, West Conshohocken, PA, 19428-2959 .D2925 144
