ASTM D7764-20 PDF Download

ASTM D7764-20 is a standard practice that outlines two acceptance tests for vibrating wire piezometers: a zero test and a down-hole test. These tests are essential to ensure the proper functioning of the piezometer before it is installed.

The standard acknowledges that vibrating wire piezometers are usually not recoverable after installation and emphasizes the importance of verifying their operational condition beforehand. This is crucial because replacing a piezometer entails drilling a new borehole, which can be costly and sometimes even impossible.

Field testers are advised to use available equipment for testing, understanding that it may not achieve the same accuracy and precision as stated in the manufacturer's calibration record. The focus should be on identifying any apparent non-conformances through the specified procedures.

It is important to note that this standard practice does not prohibit the use of other suitable acceptance tests and procedures. However, the quality of the results obtained from this standard depends on the competence of the personnel conducting the tests, as well as the suitability of the equipment and facilities being used.

Additionally, the standard includes a note cautioning users that compliance with ASTM D3740 (Practice for Evaluation of Agencies Involved in Testing, Quality Assurance, and Evaluating of Building Components) does not guarantee reliable results. The standard recognizes that various factors contribute to the reliability of test results and that ASTM D3740 provides a means of evaluating some of these factors.