<p>This Architectural Drawing is AutoCAD 2dd rawing of Underground piping details in AutoCAD, dwg file. <strong>The piping that is in contact with soil or runs below grade level</strong> is called buried or underground piping. In the oil and gas industry, we find frequent use of buried piping mainly for cross-country pipelines where security and safety justify the pipelines to be underground. For more details and information download the drawing file.</p>