Method of the Mechanical Properties Evaluation of Polyethylene Gas Pipelines with Portable Hardness Testers
- Pipes that have been in operation for several decades do not meet modern requirements, which does not interfere with their safe operation;
- The requirements for new pipes imply their resistance to various mechanical stresses during construction, while in-service pipelines do not experience such loads;
- A complete list of tests of PE pipes implies the use of full-size samples, which, in the case of gas pipelines in operation, requires their complete shutdown in order to cut long sections of pipes (up to 10 m) with subsequent repair.
2. Materials and Methods
2.2. Standard Methods for Mechanical Testing of PE Pipes
2.3. Non-Destructive Test Methods
- an assessment was made of the correspondence between the stress at yield, determined by tensile tests and limiting circumferential (hoop) stress, determined by the short-term pressure tests of full-size samples;
- the results of hardness measurements and stress at yield were compared by the value of standard deviation;
- the correlation coefficients between the values of hardness and stress at yield are calculated.
- The values of stress at yield obtained during the tensile tests correlate well with the value of critical stress in the pipe wall determined during the short-term pressure tests;
- The method of DII demonstrates the best results in comparison with Shore and Leeb hardness testers, both in terms of the spread of measurement results (random error) and in terms of correlation with the values of the stress at yield determined from the results of tensile tests;
- The use of the DII method makes it possible to determine the stress at yield of the pipe material with high accuracy without cutting samples and stopping the operation of the gas pipeline.
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Conflicts of Interest
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|Year of Construction||Service Life, Years||Diameter, mm||Wall Thickness, mm|
|Sample||Service Life, Years||Short-Term Pressure Test||Tensile Tests||Hardness Measurements|
|Limiting Circumferential (Hoop) Stress, σc, MPa,||Stress at Yield, σy, MPa||SD, %||HS||SD, %||HLC||SD, %||HDII||SD, %|
|Sample||Years in Service||σy, MPa||HDII||K = σy/HDII|
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Vinogradova, A.; Gogolinskii, K.; Umanskii, A.; Alekhnovich, V.; Tarasova, A.; Melnikova, A. Method of the Mechanical Properties Evaluation of Polyethylene Gas Pipelines with Portable Hardness Testers. Inventions 2022, 7, 125. https://doi.org/10.3390/inventions7040125
Vinogradova A, Gogolinskii K, Umanskii A, Alekhnovich V, Tarasova A, Melnikova A. Method of the Mechanical Properties Evaluation of Polyethylene Gas Pipelines with Portable Hardness Testers. Inventions. 2022; 7(4):125. https://doi.org/10.3390/inventions7040125Chicago/Turabian Style
Vinogradova, Anna, Kirill Gogolinskii, Alexander Umanskii, Varvara Alekhnovich, Alena Tarasova, and Alena Melnikova. 2022. "Method of the Mechanical Properties Evaluation of Polyethylene Gas Pipelines with Portable Hardness Testers" Inventions 7, no. 4: 125. https://doi.org/10.3390/inventions7040125