ASTM F2261-06
(Test Method)Standard Test Method for Pressure Rating Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40 and 80 Socket-Type
Standard Test Method for Pressure Rating Poly(Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40 and 80 Socket-Type
SIGNIFICANCE AND USE
The procedure for establishing the long-term pressure rating of fittings starts with an extrapolation of a regression line that is based on fitting failure data with respect to time, when assemblies are tested in accordance with Test Method D 1598. The pressure-versus time to failure data are obtained using water at 73°F in assemblies that are immersed in a water or air environment. The extrapolation is made in such a manner that the long-term hydrostatic pressure rating is determined for these conditions.
The pressure design basis is determined by considering the following items and evaluating them in accordance with 6.3.
4.2.1 Long-term hydrostatic pressure-strength at 100 000 h,
4.2.2 Long-term hydrostatic pressure-strength at 50 years
The fitting pressure rating may be calculated by multiplying the pressure design basis (PDB) by the appropriate design factor (DF).
SCOPE
1.1 This test method covers a procedure for establishing Pressure Rating for PVC schedule 40 and 80 socket-type fittings by evaluating fitting failure test data derived by testing water-filled assemblies of pipe and fittings.
1.2 Unless the data approximates a straight line, when calculated using log-log coordinates, it is not possible to assign a pressure rating to that product or sample of product. Data that exhibit high scatter, or a downward curve, due to low long term data, will give low extrapolated values that are more conservative when calculated using log-log co-ordinates. In addition, this downward curve will show as higher scatter, and where the lower confidence level limits are not met the data shall be classified as unsuitable. (See Note 1) Note 1
This test method is similar to that used in Test Method D 2837, which has been used for about 30 years to establish the HDS of plastic pipe materials and is the basis for all pressure ratings assigned to plastic pipes.
1.3 The products covered by this test method are schedule 40 or 80 molded PVC fittings that conform to Specifications D 2466 or D 2467.
1.4 The pressure ratings developed using this test method applies only to fittings identical to the ones that were tested. Some variables that will affect the pressure rating are - pipe size, pattern, mold design, material, and molding conditions.
1.5 The values in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.6 The testing procedure used to obtain the fitting failure data shall be as described in those sections of Test Method D 1598, that are referenced in Section of this test method.
1.7 The products covered by this test method are intended for use in the distribution of pressurized liquids at 73°F. When appropriate, the design engineer must consider the effects of elevated temperature and chemical compatibility of the liquid with the fitting material and apply necessary design factors.
This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the application of regulatory limitations prior to use.Note 2
Pressurized (compressed) air or other compressed gases contain large amounts of stored energy which present serious safety hazards should a system fail for any reason.
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Standards Content (Sample)
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An American National Standard
Designation: F2261 – 06
Standard Test Method for
Pressure Rating Poly(Vinyl Chloride) (PVC) Plastic Pipe
Fittings, Schedule 40 and 80 Socket-Type.
This standard is issued under the fixed designation F2261; 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 appropriate, the design engineer must consider the effects of
elevated temperature and chemical compatibility of the liquid
1.1 This test method covers a procedure for establishing
with the fitting material and apply necessary design factors.
Pressure Rating for PVC schedule 40 and 80 socket-type
1.8 This standard does not purport to address all of the
fittings by evaluating fitting failure test data derived by testing
safety problems, if any, associated with its use. It is the
water-filled assemblies of pipe and fittings.
responsibility of the user of this standard to establish appro-
1.2 Unless the data approximates a straight line, when
priate safety and health practices and determine the applica-
calculated using log-log coordinates, it is not possible to assign
tion of regulatory limitations prior to use.
apressureratingtothatproductorsampleofproduct.Datathat
exhibithighscatter,oradownwardcurve,duetolowlongterm
NOTE 2—Pressurized (compressed) air or other compressed gases
data, will give low extrapolated values that are more conser-
contain large amounts of stored energy which present serious safety
hazards should a system fail for any reason.
vative when calculated using log-log co-ordinates. In addition,
thisdownwardcurvewillshowashigherscatter,andwherethe
2. Referenced Documents
lower confidence level limits are not met the data shall be
2.1 ASTM Standards:
classified as unsuitable. (See Note 1)
D1598 Test Method for Time-to-Failure of Plastic Pipe
NOTE 1—ThistestmethodissimilartothatusedinTestMethodD2837,
Under Constant Internal Pressure
which has been used for about 30 years to establish the HDS of plastic
D2466 SpecificationforPoly(VinylChloride)(PVC)Plastic
pipe materials and is the basis for all pressure ratings assigned to plastic
Pipe Fittings, Schedule 40
pipes.
D2467 SpecificationforPoly(VinylChloride)(PVC)Plastic
1.3 The products covered by this test method are schedule
Pipe Fittings, Schedule 80
40 or 80 molded PVC fittings that conform to Specifications
D2837 TestMethodforObtainingHydrostaticDesignBasis
D2466 or D2467.
forThermoplastic Pipe Materials or Pressure Design Basis
1.4 The pressure ratings developed using this test method
for Thermoplastic Pipe Products
applies only to fittings identical to the ones that were tested.
2.2 Other Standards:
Some variables that will affect the pressure rating are – pipe
PPI Report– TR-4 – HDB/SDB/PDB/MRS Listed Materi-
size, pattern, mold design, material, and molding conditions.
als
1.5 The values in inch-pound units are to be regarded as the
standard. The values given in parentheses are mathematical
3. Terminology
conversions to SI units that are provided for information only
3.1 Definitions of Terms Specific to This Standard:
and are not considered standard.
3.1.1 failure—the act, state, or fact of failing, specifically a
1.6 The testing procedure used to obtain the fitting failure
lost of strength or breakdown of function
data shall be as described in those sections of Test Method
3.1.1.1 Discussion—for testing purposes, failure is the
D1598, that are referenced in Section 6 of this test method.
bursting, cracking or weeping of the fitting
1.7 The products covered by this test method are intended
for use in the distribution of pressurized liquids at 73°F. When
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
This test method is under the jurisdiction of ASTM Committee F17 on Plastic contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Piping Systems and is the direct responsibility of Subcommittee F17.40 on Test Standards volume information, refer to the standard’s Document Summary page on
Methods. the ASTM website.
Current edition approved July 1, 2006. Published July 2006. DOI: 10.1520/ Plastics Pipe Institute 1825 Connecticut Ave NW Suite 680 Washington, DC
F2261-06. 20009
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F2261 – 06
3.1.2 LTHS —the estimated internal pressure that when 6. Procedure
p
applied continuously will cause failure of the fitting at 100 000
6.1 General—Generate data in accordance with Test
h. This is the intercept of the pressure regression line with the
Method D1598 Sections 6 Apparatus, 8. Conditioning and 9.
100 000-h intercept.
Procedure. When any part of this test method is not in
3.1.3 pressure design basis (PDB)—one of a series of
agreement with those sections of Test Method D1598, the
established pressure values for plastic piping components
provisions of this test method shall control.
(multilayer pipe, fitting, valve, etc.) obtaining by categorizing
6.2 Pressure-versus Time Data—Obtain a minimum of 18
the LTHS in accordance with Table 2 of Specification D2837.
p fitting-failure data points distributed as follows. Use water as
3.1.4 pressure rating (PR)—the estimated maximum con- the test medium with an air or water environment.
tinuous water pressure that the fitting is able of withstanding
Hours Data points
continuously with a high degree of certainty that failure of the
< 10 At least 6
fitting will not occur. 10 – 1000 At least 3
1000 - 6000 At least 3
3.1.4.1 Discussion—The PR and PDB ar
...
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