Built on the AutoCad 2003 platform, Autodesk Building Systems 3 is a standalone application that meets an engineer's building mechanical, electrical and plumbing needs from schematic design through construction documentation. It provides engineering-specific features to increase productivity and accuracy; building information modeling technology to improve coordination of construction documents and project data; and extensive content libraries and creation tools. The mechanical module contains single, 2D or 3D pipes for creating chilled water, hot water, steam or other piping systems. The plumbing module provides a customizable, built-in plumbing code system for automatically calculating pipe sizing and flow requirements. Autodesk, Inc.