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About This Item
Full Description
Extensive evaluation of stress-rupture data by PPI and others has also indicated that in the case of some materials and under certain test conditions, generally at higher test temperatures, a departure from linearity, or "down-turn", may occur beyond this test method's minimum required data collection period of 10 000 h. A PPI study has shown that in the case of polyethylene piping materials that are projected to exhibit a "down-turn" prior to 100 000 h at 73 °F, the long-term field performance of these materials is prone to more problems than in the case of materials which have a projected "down-turn" that lies beyond the 100 000-h intercept. In response to these observations, a supplemental "validation" requirement for PE materials has been added to this test method in 1988. This requirement is designed to reject the use of this test method for the estimating of the long-term strength of any PE material for which supplemental elevated temperature testing fails to validate this test method's inherent assumption of continuing straight-line stress-rupture behavior through at least 100 000 h at 23 °C (73 °F).
When applying this test method to other materials, appropriate consideration should be given to the possibility that for the particular grade of material under evaluation and for the specific conditions of testing, particularly, when higher test temperatures and aggressive environments are involved, there may occur a substantial "down-turn" at some point beyond the data collection period. The ignoring of this possibility may lead to an overstatement by this test method of a material's actual LTHS/LTHSP. To obtain sufficient assurance that this test method's inherent assumption of continuing linearity through at least 100 000 h is appropriate, the user should consult and consider information outside this test method, including very long-term testing or extensive field experience with similar materials. In cases for which there is insufficient assurance of the continuance of the straight-line behavior that is defined by the experimental data, the use of other test methods for the forecasting of long-term strength should be considered (see Appendix X1).
Document History
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ASTM D2837-24
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Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products- Most Recent
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ASTM D2837-22
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products- Historical Version
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ASTM D2837-21
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products- Historical Version
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ASTM D2837-13e1
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products- Historical Version
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ASTM D2837-13
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products- Historical Version
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ASTM D2837-11
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products- Historical Version
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ASTM D2837-08
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products- Historical Version
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ASTM D2837-04e1
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products- Historical Version
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ASTM D2837-04
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for Thermoplastic Pipe Products- Historical Version
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ASTM D2837-02
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials- Historical Version
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ASTM D2837-01ae1
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials- Historical Version
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ASTM D2837-01a
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials- Historical Version
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ASTM D2837-01
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials- Historical Version
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ASTM D2837-98a
Standard Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials- Historical Version