ASTM D2992-22
(Practice)Standard Practice for Obtaining Hydrostatic or Pressure Design Basis for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe and Fittings
Standard Practice for Obtaining Hydrostatic or Pressure Design Basis for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe and Fittings
SIGNIFICANCE AND USE
5.1 This practice is useful for establishing the hoop stress or internal pressure versus time-to-failure relationships, under selected internal and external environments which simulate actual anticipated product end-use conditions, from which a design basis for specific piping products and materials can be obtained. This practice defines an HDB for material in straight, hollow cylindrical shapes where hoop stress can be easily calculated, and a PDB for fittings and joints where stresses are more complex.
5.1.1 An alternative design practice based on initial strain versus time-to-failure relationships employs a strain basis HDB instead of the stress basis HDB defined by this practice. The strain basis HDB is most often used for buried pipe designs with internal pressures ranging from 0 to 250 psig (1.72 MPa).
5.2 To characterize fiberglass piping products, it is necessary to establish the stress versus cycles or time to failure, or pressure versus cycles or time to failure relationships over three or more logarithmic decades of time (cycles or hours) within controlled environmental parameters. Because of the nature of the test and specimens employed, no single line can adequately represent the data. Therefore, the confidence limits shall be established.
5.3 Pressure ratings for piping of various dimensions at each temperature may be calculated using the HDS determined by testing one size of piping provided that the same specific process and material are used both for test specimens and the piping in question.
5.4 Pressure ratings at each temperature for components other than straight hollow shapes may be calculated using the HDP determined by testing one size of piping provided that (1) the specific materials and manufacturing process used for the test specimens are used for the components, (2) for joints, the joining materials and procedures used to prepare the test specimens are used for field joining, and (3) scaling of critical dimensions is related ...
SCOPE
1.1 This practice establishes two procedures, Procedure A (cyclic) and Procedure B (static), for obtaining a hydrostatic design basis (HDB) or a pressure design basis (PDB) for fiberglass piping products, by evaluating strength-regression data derived from testing pipe or fittings, or both, of the same materials and construction, either separately or in assemblies. Both glass-fiber-reinforced thermosetting-resin pipe (RTRP) and glass-fiber-reinforced polymer mortar pipe (RPMP) are fiberglass pipe.
Note 1: For the purposes of this standard, polymer does not include natural polymers.
1.2 This practice can be used for the HDB determination for fiberglass pipe where the ratio of outside diameter to wall thickness is 10:1 or more.
Note 2: This limitation, based on thin-wall pipe design theory, serves further to limit the application of this practice to internal pressures which, by the hoop-stress equation, are approximately 20 % of the derived hydrostatic design stress (HDS). For example, if HDS is 5000 psi (34 500 kPa), the pipe is limited to about 1000-psig (6900-kPa) internal pressure, regardless of diameter.
Note 3: Where long (continuous) glass fibers are intentionally placed to resist the planned pressure load case (that is, free end pressure testing and 654.7° fiberglass windings) the results from this practice may be overly conservative in predicting long term fiberglass pipe performance when the same pipe is operated at lower (non-damaging) stresses typical in normal pipeline applications.
Note 4: All data points in the analysis shall be of the same failure mode. Where plastic creep of the resin leading to pipe failure is precluded by unintended resin matrix cracking or other unanticipated modes of failure, this practice may not accurately represent the pipe’s life expectancy.
1.3 This practice provides a PDB for complex-shaped products or systems where complex stress fields seriously inhibit the use of h...
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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: D2992 − 22
Standard Practice for
Obtaining Hydrostatic or Pressure Design Basis for
“Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin)
1
Pipe and Fittings
This standard is issued under the fixed designation D2992; 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* 1.4 Specimen end closures in the underlying test methods
may be either restrained or free, leading to certain limitations.
1.1 This practice establishes two procedures, Procedure A
1.4.1 Restrained Ends—Specimens are stressed by internal
(cyclic) and Procedure B (static), for obtaining a hydrostatic
pressure only in the hoop direction, and the HDB is applicable
design basis (HDB) or a pressure design basis (PDB) for
for stresses developed only in the hoop direction.
fiberglass piping products, by evaluating strength-regression
1.4.2 Free Ends—Specimens are stressed by internal pres-
data derived from testing pipe or fittings, or both, of the same
sure in both hoop and longitudinal directions, such that the
materials and construction, either separately or in assemblies.
hoop stress is twice as large as the longitudinal stress. This
Both glass-fiber-reinforced thermosetting-resin pipe (RTRP)
practice may not be applicable for evaluating stresses induced
and glass-fiber-reinforced polymer mortar pipe (RPMP) are
by loadings where the longitudinal stress exceeds 50% of the
fiberglass pipe.
HDS.
NOTE 1—For the purposes of this standard, polymer does not include
1.5 Thevaluesstatedininch-poundunitsaretoberegarded
natural polymers.
as the standard. The values in parentheses are given for
1.2 ThispracticecanbeusedfortheHDBdeterminationfor
information purposes only.
fiberglass pipe where the ratio of outside diameter to wall
NOTE 5—There is no known ISO equivalent to this standard.
thickness is 10:1 or more.
1.6 This standard does not purport to address all of the
NOTE 2—This limitation, based on thin-wall pipe design theory, serves
safety concerns, if any, associated with its use. It is the
further to limit the application of this practice to internal pressures which,
responsibility of the user of this standard to establish appro-
by the hoop-stress equation, are approximately 20% of the derived
priate safety, health, and environmental practices and deter-
hydrostatic design stress (HDS). For example, if HDS is 5000 psi (34 500
kPa), the pipe is limited to about 1000-psig (6900-kPa) internal pressure,
mine the applicability of regulatory limitations prior to use.
regardless of diameter.
1.7 This international standard was developed in accor-
NOTE 3—Where long (continuous) glass fibers are intentionally placed
dance with internationally recognized principles on standard-
to resist the planned pressure load case (that is, free end pressure testing
ization established in the Decision on Principles for the
and 654.7° fiberglass windings) the results from this practice may be
Development of International Standards, Guides and Recom-
overly conservative in predicting long term fiberglass pipe performance
when the same pipe is operated at lower (non-damaging) stresses typical mendations issued by the World Trade Organization Technical
in normal pipeline applications.
Barriers to Trade (TBT) Committee.
NOTE 4—All data points in the analysis shall be of the same failure
mode.Whereplasticcreepoftheresinleadingtopipefailureisprecluded
2. Referenced Documents
by unintended resin matrix cracking or other unanticipated modes of
2
failure, this practice may not accurately represent the pipe’s life expec-
2.1 ASTM Standards:
tancy.
D618Practice for Conditioning Plastics for Testing
1.3 This practice provides a PDB for complex-shaped prod- D883Terminology Relating to Plastics
ucts or systems where complex stress fields seriously inhibit D1598Test Method for Time-to-Failure of Plastic Pipe
the use of hoop stress. Under Constant Internal Pressure
D1599Test Method for Resistance to Short-Time Hydraulic
Pressure of Plastic Pipe, Tubing, and Fittings
1
ThispracticeisunderthejurisdictionofASTMCommitteeD20onPlasticsand
is the direct responsibility of Subcommittee D20.23 on Reinforced Thermosetting
2
Resin Piping Systems and Chemical Equipment. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2022. Published December 2022. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1971. Last previous edition ap
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it 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 version
of the standard as published by ASTM is to be considered the official document.
Designation: D2992 − 18 D2992 − 22
Standard Practice for
Obtaining Hydrostatic or Pressure Design Basis for
“Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin)
1
Pipe and Fittings
This standard is issued under the fixed designation D2992; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This practice establishes two procedures, Procedure A (cyclic) and Procedure B (static), for obtaining a hydrostatic design
basis (HDB) or a pressure design basis (PDB) for fiberglass piping products, by evaluating strength-regression data derived from
testing pipe or fittings, or both, of the same materials and construction, either separately or in assemblies. Both glass-fiber-
reinforced thermosetting-resin pipe (RTRP) and glass-fiber-reinforced polymer mortar pipe (RPMP) are fiberglass pipe.
NOTE 1—For the purposes of this standard, polymer does not include natural polymers.
1.2 This practice can be used for the HDB determination for fiberglass pipe where the ratio of outside diameter to wall thickness
is 10:1 or more.
NOTE 2—This limitation, based on thin-wall pipe design theory, serves further to limit the application of this practice to internal pressures which, by the
hoop-stress equation, are approximately 20 % of the derived hydrostatic design stress (HDS). For example, if HDS is 5000 psi (34 500 kPa), the pipe
is limited to about 1000-psig (6900-kPa) internal pressure, regardless of diameter.
NOTE 2—This limitation, based on thin-wall pipe design theory, serves further to limit the application of this practice to internal pressures which, by the
hoop-stress equation, are approximately 20 % of the derived hydrostatic design stress (HDS). For example, if HDS is 5000 psi (34 500 kPa), the pipe
is limited to about 1000-psig (6900-kPa) internal pressure, regardless of diameter.
NOTE 3—Where long (continuous) glass fibers are intentionally placed to resist the planned pressure load case (that is, free end pressure testing and 654.7°
fiberglass windings) the results from this practice may be overly conservative in predicting long term fiberglass pipe performance when the same pipe
is operated at lower (non-damaging) stresses typical in normal pipeline applications.
NOTE 4—All data points in the analysis shall be of the same failure mode. Where plastic creep of the resin leading to pipe failure is precluded by
unintended resin matrix cracking or other unanticipated modes of failure, this practice may not accurately represent the pipe’s life expectancy.
1.3 This practice provides a PDB for complex-shaped products or systems where complex stress fields seriously inhibit the use
of hoop stress.
1.4 Specimen end closures in the underlying test methods may be either restrained or free, leading to certain limitations.
1.4.1 Restrained Ends—Specimens are stressed by internal pressure only in the hoop direction, and the HDB is applicable for
stresses developed only in the hoop direction.
1
This practice is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.23 on Reinforced Plastic Thermosetting
Resin Piping Systems and Chemical Equipment.
Current edition approved May 15, 2018Dec. 1, 2022. Published May 2018December 2022. Originally approved in 1971. Last previous edition approved in 20122018 as
D2992 – 12.D2992 – 18. DOI: 10.1520/D2992-18.10.1520/D2992-22.
*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
1
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D2992 − 22
1.4.2 Free Ends—Specimens are stressed by internal pressure in both hoop and longitudinal directions, such that the hoop stress
is twice as large as the longitudinal stress. This practice may not be applicable for evaluating stresses induced by loadings where
the longitudinal stress exceeds 50 % of the HDS.
1.5 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are given for information
purposes only.
NOTE 5—There is no known ISO equivalent to this standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appr
...
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