ASTM D2992-12
(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
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.
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).
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 should be established.
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.
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 to diameter and pressu...
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.
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.
1.4.2 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 ...
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Standards Content (Sample)
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Designation: D2992 − 12 An American National Standard
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* practice may not be applicable for evaluating stresses induced
by loadings where the longitudinal stress exceeds 50% of the
1.1 This practice establishes two procedures, Procedure A
HDS.
(cyclic) and Procedure B (static), for obtaining a hydrostatic
1.5 Thevaluesstatedininch-poundunitsaretoberegarded
design basis (HDB) or a pressure design basis (PDB) for
as the standard. The values in parentheses are given for
fiberglass piping products, by evaluating strength-regression
information purposes only.
data derived from testing pipe or fittings, or both, of the same
materials and construction, either separately or in assemblies.
NOTE 3—There is no known ISO equivalent to this standard.
Both glass-fiber-reinforced thermosetting-resin pipe (RTRP)
1.6 This standard does not purport to address all of the
and glass-fiber-reinforced polymer mortar pipe (RPMP) are
safety concerns, if any, associated with its use. It is the
fiberglass pipe.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
NOTE 1—For the purposes of this standard, polymer does not include
natural polymers. bility of regulatory limitations prior to use.
1.2 ThispracticecanbeusedfortheHDBdeterminationfor
2. Referenced Documents
fiberglass pipe where the ratio of outside diameter to wall
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2.1 ASTM Standards:
thickness is 10:1 or more.
D618Practice for Conditioning Plastics for Testing
NOTE 2—This limitation, based on thin-wall pipe design theory, serves
D883Terminology Relating to Plastics
further to limit the application of this practice to internal pressures which,
D1598Test Method for Time-to-Failure of Plastic Pipe
by the hoop-stress equation, are approximately 20% of the derived
Under Constant Internal Pressure
hydrostatic design stress (HDS). For example, if HDS is 5000 psi (34500
D1599Test Method for Resistance to Short-Time Hydraulic
kPa), the pipe is limited to about 1000-psig (6900-kPa) internal pressure,
regardless of diameter. Pressure of Plastic Pipe, Tubing, and Fittings
D1600TerminologyforAbbreviatedTermsRelatingtoPlas-
1.3 This practice provides a PDB for complex-shaped prod-
tics
ucts or systems where complex stress fields seriously inhibit
D2143 Test Method for Cyclic Pressure Strength of
the use of hoop stress.
Reinforced, Thermosetting Plastic Pipe
1.4 Specimen end closures in the underlying test methods
D3567PracticeforDeterminingDimensionsof“Fiberglass”
may be either restrained or free, leading to certain limitations.
(Glass-Fiber-Reinforced Thermosetting Resin) Pipe and
Fittings
1.4.1 Restrained Ends—Specimens are stressed by internal
F412Terminology Relating to Plastic Piping Systems
pressure only in the hoop direction, and the HDB is applicable
F948Test Method for Time-to-Failure of Plastic Piping
for stresses developed only in the hoop direction.
Systems and Components Under Constant Internal Pres-
1.4.2 Free Ends—Specimens are stressed by internal pres-
sure With Flow
sure in both hoop and longitudinal directions, such that the
2.2 ISO Standard:
hoop stress is twice as large as the longitudinal stress. This
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3 Preferred Numbers—Series of Preferred Numbers
1 2
ThispracticeisunderthejurisdictionofASTMCommitteeD20onPlasticsand For referenced ASTM standards, visit the ASTM website, www.astm.org, or
is the direct responsibility of Subcommittee D20.23 on Reinforced Plastic Piping contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Systems and Chemical Equipment. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 1, 2012. Published May 2012. Originally the ASTM website.
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approved in 1971. Last previous edition approved in 2006 as D2992–06. DOI: Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/D2992-12. 4th Floor, New York, NY 10036, http://www.ansi.org.
*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
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D2992 − 12
3. Terminology appliedcyclically(ProcedureA)orcontinuously(ProcedureB)
with a high degree of certainty that failure of the pipe w
...
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