chapter 21
TRANSCRIPT
Piping Drawings
Chapter 21
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.2
Objectives
• Identify cast iron, brass, copper, and thermoplastic pipe and tubing fittings
• Draw and label common pipe joints using ANSI/ASME standard designations
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.3
Objectives (cont.)
• Draw multiview or pictorial piping drawings using standard schematic symbols
• Draw the schematic symbols for valves and identify flow direction
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.4
Standard Symbols
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Types of Drawings
• Two types of drawings are common for piping systems:• Single-line drawings show the center-
line of the pipe• Double-line drawings show two lines
representing the pipe diameter
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.6
Types of Drawings
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.7
Types of Drawings
• Axonometric drawings may be used
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.8
Types of Drawings
• Piping may also be shown in a dimetric drawing or in orthographic projection
• In a developed piping drawing, vertical pipes are revolved into the horizontal plane or horizontal pipes revolved into the vertical plane so the entire installation can be shown on one plane
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.9
Types of Drawings
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.10
Dimensioning Piping Drawings• In dimensioning piping drawings,
give distances from:• Center to center,• Center to end, or• End to end of fittings or valves
• Give the lengths of all straight runs • Show the size of each pipe
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.11
Dimensioning Piping Drawings
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.12
Steel and Wrought-Iron Pipe• Steel or wrought-iron pipe is
commonly used for water, steam, oil, and gas
• Steel pipe is available as:• Black pipe for natural gas• Galvanized pipe for water distribution
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.13
Cast-Iron Pipe
• Cast-iron (C.I.) pipe is used for water or gas service and as soil pipe
• Generally water and gas pipes are connected with bell and spigot joints or flanged joints• Cast-iron pipe is brittle and settling can
cause fracture unless the joints are sufficiently flexible
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.14
Cast-Iron Pipe Joints
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Seamless Brass and Copper Pipe• Brass and copper pipe is used in
plumbing for supply, soil, waste, drain, and vent lines
• Brass and copper pipe should be joined with fittings of copper-base alloy to avoid corrosion• Both screwed and flanged fittings are
available
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.16
Screwed Fittings
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Copper Tubing
• Copper tubing is used in applications for nonferrous construction
• It is suitable for process work, for plumbing, and for heating systems
• Copper tubing joints are made with flared joints or solder joints
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.18
Copper Tubing
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Solder Fittings
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Plastic and Specialty Pipes
• A wide variety of plastic pipe, both rigid and flexible, is used in construction
• Plastic pipe is lightweight, corrosion proof, resistant to many chemicals, and has a smooth inner surface which offers low flow resistance
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.21
Plastic and Specialty Pipes
• Types of plastic pipes include:• PVC (polyvinyl chloride)• CPVC (chlorinated polyvinyl chloride)• HDPE (high density polyethylene)
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.22
Pipe Fittings
• Pipe fittings are used to:• Join lengths of pipe• Provide changes of direction• Provide branch connections at
different angles• Effect a change in size
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.23
Pipe Fittings
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.24
Pipe Fittings
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.25
Pipe Joints
• The joints between pipes, fittings, and valves may be:• Screwed• Flanged• Welded• Soldered
Technical Drawing 13th EditionGiesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.26
Valves
• Valves are used to stop or regulate the flow of fluids in a pipe line and include:• Globe valves• Check valves• Gate valves• Solenoid actuated valves