ASTM D6167-19 PDF Download

ASTM D6167-19 is a standard guide that provides general procedures for conducting mechanical caliper logging of boreholes in geotechnical investigations. It is important to use this guide in conjunction with Guide D5753. The purpose of this standard is to improve the selection of caliper logging methods and equipment, enhance the quality and reliability of caliper logs, and ensure the usefulness of caliper log data for subsequent interpretation and display.

Caliper logging is the process of measuring the diameter of a borehole at various depths. This information is essential for the interpretation of geophysical logging data, as the borehole diameter can significantly impact the results. Caliper logs provide valuable information for borehole completion and testing, including assessing diameter, shape, roughness, and stability of the borehole. Additionally, caliper logs are used to calculate borehole volume, evaluate borehole construction, and identify lithologic contacts, fractures, and solution cavities.

This standard specifically focuses on mechanically based calipers with spring-loaded arms, which are commonly used in geotechnical caliper logging. It provides an overview of the general procedures, documentation requirements, calibration and standardization methods, and guidelines for log quality and interpretation. However, this guide should not be the sole criterion for caliper logging and professional judgment should be exercised. It is important to note that this standard does not address all safety and liability concerns associated with caliper logging.