ASTM D2925-14(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D2925 −14 (Reapproved 2019)
Standard Test Method for
Beam Deflection of “Fiberglass” (Glass-Fiber-Reinforced
Thermosetting Resin) Pipe Under Full Bore Flow
This standard is issued under the fixed designation D2925; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2.1 ASTM Standards:
1.1 This test method covers measurement of the deflection
C33/C33MSpecification for Concrete Aggregates
asafunctionoftimeofaspecimenoffiberglasspipesupported
D883Terminology Relating to Plastics
on a flat non-arced support as a simple beam under full bore
D1600TerminologyforAbbreviatedTermsRelatingtoPlas-
flow of water at elevated temperatures. Both glass-fiber-
tics
reinforced thermosetting-resin pipe (RTRP) and glass-fiber-
D3567PracticeforDeterminingDimensionsof“Fiberglass”
reinforced polymer mortar pipe (RPMP) are fiberglass pipes.
(Glass-Fiber-Reinforced Thermosetting Resin) Pipe and
NOTE 1—For the purposes of this standard, polymer does not include
Fittings
natural polymers.
F412Terminology Relating to Plastic Piping Systems
1.2 This test method can be used to determine deflection at
varying conditions by substituting other test media.
3. Terminology
3.1 General—DefinitionsareinaccordancewithTerminolo-
1.3 Deflections observed using this test method are repre-
sentative only of piping supported as a simple beam under full gies D883 and F412 and abbreviations are in accordance with
Terminology D1600, unless otherwise indicated.
bore flow which has one diameter of pipe overhanging at each
support.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 aggregate—a siliceous sand conforming to the re-
1.4 The values stated in SI units are to be regarded as the
quirements of Specification C33/C33M, except that the re-
standard. The values given in parentheses are provided for
quirements for gradation shall not apply.
information purposes only.
3.2.2 fiberglass pipe—a tubular product containing glass
NOTE 2—There is no known ISO equivalent to this standard.
fiber reinforcement embedded in or surrounded by cured
1.5 This standard does not purport to address all of the
thermosetting resin; the composite structure may contain
safety concerns, if any, associated with its use. It is the
aggregate, granular or platelet fillers, thixotropic agents,
responsibility of the user of this standard to establish appro-
pigments, or dyes; thermoplastic or thermosetting liners may
priate safety, health, and environmental practices and deter-
be included.
mine the applicability of regulatory limitations prior to use.
3.2.3 reinforced thermosetting resin pipe (RTRP)—a fiber-
1.6 This international standard was developed in accor-
glass pipe without aggregate.
dance with internationally recognized principles on standard-
3.2.4 reinforced polymer mortar pipe (RPMP)—a fiberglass
ization established in the Decision on Principles for the
pipe with aggregate.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Significance and Use
Barriers to Trade (TBT) Committee.
4.1 In the absence of deflection measurements from actual
installed-above-groundpiping,thistestmethodmaybeusedto
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.23 on Reinforced Plastic
Piping Systems and Chemical Equipment. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Aug. 1, 2019. Published August 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1970. Last previous edition approved in 2014 as D2925–14. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D2925-14R19. the ASTM website.
*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
D2925 − 14 (2019)
evaluatetheinfluenceofspanlengthonmid-spandeflectionsat water at all times. Any recirculation shall be vented to
differing temperatures under full bore flow. atmosphere.Aschematic drawing of the test setup is shown on
Fig. 2.
NOTE 3—A flat bearing area, small contact area, and narrow bearing
width may induce high localized support interaction stresses, and con-
5.3 Flexible Connections for the ends of the pipe test
straints imposed by the supports may also adversely influence deflections
specimens,installedsoastoproducenegligiblemomentonthe
and performance of the pipe.
ends of the pipe.
5. Apparatus 5.4 A Device for Measuring the Deflection of the pipe
specimen to the nearest 0.025 mm (0.001 in.) with negligible
5.1 Rigid Support with edges rounded to a 6-mm ( ⁄4-in.)
constraint on the specimen. A recommended device is a
radius, consisting of two uprights of a convenient height. The
cathetometer as shown on Fig. 1.
uprights are to be spaced at a predetermined distance over
which deflection is to be determined as shown on Fig. 1. The 5.5 Time-Interval Measuring Device graduated in minutes
or seconds.
uprights shall have lateral guides, a saddle, groove, or inden-
tation on the top to keep the pipe specimen from rolling off
5.6 Temperature and Pressure Gages and suitable control
when placed in position.
devices to maintain standard test conditions.
5.1.1 The support space distance shall be estimated for a
6. Test Specimens
maximum allowable sag of 12.7 mm ( ⁄2in.) at test conditions.
This estimate may be made by solving Eq 1 for L, using y=
6.1 The test specimens shall be sections of fiberglass pipe
12.7 mm ( ⁄2 in.) and assuming an elastic modulus, E=
cuttoaprecalculatedspanlengthplustwo
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