ASTM D4525-13e2 PDF Download

ASTM D4525-13e2 is a standard test method that is used to measure the permeability of rocks to flowing air. The test method can also be used to determine an equivalent of the liquid permeability by extrapolation. This parameter is essential in calculating the flow of fluids through rocks under pressure differentials.

It is important to note that the accuracy and reliability of the test results depend on the competence of the personnel conducting the test and the suitability of the equipment and facilities used. While compliance with the criteria of Practice D3740 is generally considered to ensure competent and objective testing, it does not guarantee reliable results. The reliability of the results relies on various factors, some of which are addressed by Practice D3740.

The scope of this test method is to determine the coefficient of specific permeability for the flow of air through rocks. The method is applicable only for permeability values greater than 9.869 × 10^-18 m^2 (0.01 millidarcy) and for rocks that are free of oil or unctuous matter.

To ensure consistency in reporting the test results, this standard specifies guidelines for significant digits and rounding, as established in Practice D6026. These procedures are considered the industry standard and represent the significant digits that should generally be retained. However, it is noted that these procedures do not account for material variation, the purpose of obtaining the data, special purpose studies, or the user's objectives. Adjustments to the reported data's significant digits may be necessary based on these considerations, which are beyond the scope of this standard.