Is water or air usually used for strength testing of carbon dioxide and compressed air pipelines?
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When conducting strength pressure tests on carbon dioxide pipelines (design pressure 0.3 MPa) and compressed air pipelines (design pressure 1.0 MPa), is water or gas usually used?
Water is usually used. Air pressure testing of compressed air pipelines (with a design pressure of 1.0 MPa) shall be carried out in accordance with the provisions of GB50235-97. For 0.3MPa carbon dioxide pipelines, both air and water can be used. This post was last edited by Wanwan Yue on 2008-3-20 20:43]
Pipeline strength tests are generally conducted using water; the use of gas for such tests is not permitted unless specifically authorized. Gas is generally used for pipeline leak testing and airtightness testing.
Gas pipelines with a design pressure of less than 0.6 MPa can be subjected to pressure testing using gas; otherwise, water should be used for the pressure test.
Gas pipelines with a design pressure of less than 0.6 MPa can be subjected to pressure testing using applicable gases, provided that safety precautions are taken； If specified in the design documents and approved by the project owner, pipelines with a design pressure greater than 0.6 MPa can also be tested using air pressure testing. Otherwise, a pressure test using water shall be conducted.