ASTM D2143 outlines a test method for evaluating how reinforced plastic pipes with a diameter-to-wall thickness ratio of 10:1 or greater respond to cyclic internal hydraulic pressure. It excludes creep and permanent deformation, relying on representative sampling and strict adherence to test procedures for valid results.
Background and scope
ASTM D2143 is a standard test method designed to determine the failure characteristics of reinforced plastic pipes subjected to cyclic internal hydraulic pressure. The method focuses specifically on pipe products where the ratio of outside diameter to wall thickness is 10:1 or greater. It does not measure the creep behavior or nonrecoverable deformation, but is intended to test the cyclic internal pressure performance of the pipe. Data obtained from ASTM D2143 are only applicable when the unique conditions and procedures described in the standard are replicated exactly. The acceptance of results relies on the selection of representative specimens and consistent test conditions to avoid discrepancies. The standard allows for one pressure point, used in original regression analysis, to be selected as a control pressure for routine quality control, subject to agreement between the relevant parties.
Key considerations
This method assumes that chosen specimens properly represent the pipe material and manufacturing process, so test outcomes are reliable. Departures from representative sampling may lead to errors surpassing those caused by deviations from the procedure itself. When using ASTM D2143 data for determining cyclic hydrostatic design basis, the guidance in ASTM Practice D2992 should be followed to ensure accurate results across various temperature and pressure effects.
Testing limitations
ASTM D2143 is limited to evaluating cyclic pressure performance and does not substitute for standards that evaluate long-term strength, creep, or deformation. Detailed attention must be paid to specimen selection and consistency across groups to ensure test validity, especially for studies regarding temperature and pressure impact on pipe longevity.
Takeaway
ASTM D2143 offers a reliable framework for the assessment of reinforced plastic pipes under repeated hydraulic pressure, but its accuracy depends upon strict adherence to protocol and proper specimen selection.
Setting up the test environment
The first step in ASTM D2143 testing is to prepare a testing environment that replicates the standard’s specified conditions. The test environment should maintain consistent temperature and pressure controls, with all equipment verified for accuracy and safety. All materials must be traceable to their manufacturing process, ensuring they meet the specified diameter and wall thickness requirements found in the scope of the standard.
Specimen selection and preparation
Choose test specimens that are truly representative of the pipe material and manufacturing process you intend to evaluate. Specimens should be free from obvious defects and conform to the dimensions indicated in the standard. Proper marking of each specimen, as well as documentation of any variations, is recommended.
Conducting the cyclic pressure test
Install each specimen in a test rig capable of delivering controlled, cyclic internal hydraulic pressure per ASTM D2143 requirements. Regulate the frequency and pressure parameters to ensure consistency for all test specimens. Start the pressure cycling and monitor specimens until failure, noting the number of cycles and failure mode for each pipe section. No data on creep or permanent deformation is required.
Data collection and interpretation
Record cycle counts to failure, pressure settings for each specimen, and relevant environmental information (temperature, fluid, etc.). If data are to be used for quality control, select one of the original regression points by mutual agreement for ongoing evaluation. To use results for cyclic hydrostatic design basis, apply the procedures described in ASTM D2992.
Reporting and quality control
Prepare a final test report detailing the methods, materials, parameters, and outcomes, including any deviations from the standard procedure. For routine production or quality control, use an agreed-upon regression point as the control pressure to test future pipe production. Proper reporting ensures traceability and helps verify that pipe characteristics consistently meet requirements.
Summary
Following ASTM D2143 for cyclic internal pressure testing provides a controlled means of assessing reinforced plastic pipe reliability. Success relies on correct specimen selection, reproducible test environments, and careful data interpretation without evaluating creep or deformation. Correct implementation supports ongoing quality control and supports further analysis through standards such as ASTM D2992.
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