API PUBL 351:1999 pdf download.Overview of Coil Permeability Test Methods
Sections 2 and 3 provide detailed information on the cited laboratory and field permeability test methods. These sections each contain a table that summarizes the test procedures, presents the advantages/disadvantages for the procedures and provides typical costs for conducting the procedures. Preceding the tables are more detailed narratives of the tests including schematics of the test methods. For detailed specifications on how to perform each test, the reader is directed to consult the cited references. The tables provide an indication of the relative costs of sampling and analysis for each test method. These costs are intended to be used only as a basis for comparing the various test methods. Actual sampling and analytical costs will vary depending on site conditions, geographical location, access into the facility and other conditions that will vary from site to site. A NOTE OF CAUTION Numerous test methods exist to determine soil permeability. The API does not endorse or recommend any one method, nor can API represent or defend the accuracy of a particular method. The reader is cautioned to fully investigate the appropriateness of a test method and to determine its suitability to a particular situation. Application of the methods cited in this report should be based on sound engineering judgment and in accordance with relevant codes and standards. Results of the tests depend on sampling analytical methods, experience and expertise of the technical staff,
Permeability test methods often are suitable for certain types of soils (e.g., fine grained soils, such as silts and clays, or coarse grained soils, such as sands and gravels). The soil conditions at the test site determine the selection of the most suitable test method or methods. The following guidelines are presented for information only, and may serve as a basis to assist the reader in the proper selection and use of the various methods presented in this report. Determine the approximate soil type via hand excavated test pits. The soil type should be determined using the Unified Soil Classification System (VSCS) (US. Army Engineer Waterways Experiment Station, 1953). Typically, soil types can be divided into granular soils, including sands and gravels, or fine grained soils, such as silts and clays. other types of soil deposits may include organic soils, such as peat, or fill materials consisting of construction and demolition debris. After the soil type is determined, the most appropriate test method(s) can be selected from the tables provided in this document. For granular soils, such as sands, gravels, silty sands or sandy silts, many of the field methods and several of the lab methods are suitable for determining permeability. These methods are relatively inexpensive and provide good correlation to actual field conditions. Impermeable cohesive clays represent a challenge for field test methods. For silty clays and heavy clay soils, the majority of the readily available field methods cannot be performed within a reasonable timefiame or they may report inaccurate results. The laboratory flexible wall permeameter (triaxial) test will provide accurate results for a moderate cost. This method usually requires obtaining an undisturbed tube (Shelby tube) sample.
API PUBL 351:1999 pdf download
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