1. Welcome! Drafting 2323: Pipe Drafting Andrew Amini Full Time Instructor, HCC

2. Chapter 2-Steel Pipe 1 Piping Materials: Most common material is carbon steel pipe Pipe is used to transport liquids, gases, vapors, liquefied solids

3. Chapter 2-Steel Pipe 2 Manufacturing Methods: Carbon steel pipe is manufactured based on pipe strength, wall thickness, corrosion resistance, temperature, and pressure Common manufacturing methods are for seamless, butt- welded, and spiral welded pipe Seamless Pipe-piercing a billet with a mandrel to produce a pipe that has no seams or joints Butt-welded Pipe-Feeding a hot steel plates through shapers to obtain a hollow circular shape. Spiral-Welded pipe-Formed by twisting strips of metal into a spiral shape

4. Chapter 2-Steel Pipe 3 Nominal Pipe Size-Refers to the OD of the pipe. X 12” OD is equal to the nominal size ID-Inside Diameter OD-Outside Diameter

5. Wall Thickness 4 Wall Thickness is the thickness of the metal that the pipe is made from. The weight system is the most common used methods. ID=OD-(2 x Wall Thickness) Pipe must be designed for the job specification

6. Methods of Joining Pipe 5 Joining pipe is necessary to form the connections needed Butt-welded pipe is made by welding the beveled ends of the pipe together. During the welding process the root gap is about 1/16” inches to separate the two pieces to be welded then they are joined together. Screwed or Thread Connections- There are male and female threads that must make-up in order for the connection to be made. When the connections are made-up then the piper must take into account the lost length from the make-up

7. Methods of Joining Pipe 6 Socket Welded Connections- Joined by welding the socket into the fitting

8. Cast Iron Pipe 7 Cast iron does corrode. It is used for gravity flow, storm/sewer systems. Gravity flow systems are for residential, commercial, and industrial facilities Joining Cast Iron Pipe—Hub/Bell or Spigot Joint—The hub end has a large diameter to resemble a bell. The spigot has a plain or flat ended joint.

9. Plastic Pipe 8 Plastic is used since it is cost effective. What part of the Up, Mid, Down stream process does plastic come from? The plastic piping comes from Fluoroplastics and Thermoplatics. Fluoroplastics-perform well in aggressive chemical temperatures at -328F to 500F Thermoplastics-require melting during the manufacturing process. The plastics are welded or injection molded into shapes for machining piping system components.

10. Joining Plastic Pipe 9 Plastic pipe is joined via threading, solvent cement, or fusion Threading plastic pipe is not realistic since it is expensive and a heavy wall must be made in order to maintain the high pressures. Solvent cement is more reliable since it is more resistant to chemical and high pressure commodities. They have multiple fittings and do not need threads.

11. Drawing Pipe 10 Single or Double lines are used Pipe 12” and smaller is using a single line and the pipe 14” and large is using the double line. Look on page 11

12. Chapter 3-Pipe Fittings 11 Fittings connect various pieces of pipe together. They come in changes made to the physical structure with the Elbow, Tee, or Reducer.

13. 90 degree Elbow 12 The elbow is used when the pipe will change direction. The types of elbows are long-radius elbow, short-radius elbow, reducing elbow, or mitered elbow. The long radius elbow: 8” x 1.5=12” To find the elbow first go to the Nominal Pipe size page 14 Drawing the long radius elbow is shown in page 17 with the three step procedure

14. Reducing elbows 13 Reducing elbows have been discontinued since the fitting made it more difficult to install and remove bolts when welded to flanges

15. Mitered Elbows 14 It is used on large pipe 24” or greater. The mitered elbow is made by making angular cuts through the straight run of pipe and then welding pipe back together after the cut sections have been rolled