Piping Related Abbreviations (D)

DBB is an abbreviation of Double Block and Bleed
The term refers to a specialized industrial valve system whose primary function is to shut off the flow and whose secondary function is to allow maintenance access.

Dwg is an abbreviation of Drawing
Dwg is a file format used to store 2D and 3D design data, and is the standard format for various drafting programs, including AutoCAD and ZWCAD.