Drawing Problems - Chapter 2 4 756 AutoCAD and Its Applications—Basics Copyright Goodheart-Willcox Co., Inc. 11. Piping Save P24-10 as P24-11. Using the P24-11 file, revise the drawing. The engi- neer has provided you with a sketch of the necessary revisions. It is up to you to alter the drawing as quickly and efficiently as possible. Do not add the dimensions shown on the sketch the dimensions are provided for construction purposes only. Revise the drawing so all chillers and the four tanks reflect the changes. 12. Piping Draw the piping flow diagram of an industrial effluent treatment system from the sketch shown. Eliminate as many bends in the flow lines as possible. Place arrowheads at all flow line intersections and bends. The flow lines should not run through any valves or equipment. Use polylines for the thick flow lines. Save the drawing as P24-12.