Chapter 22 Industrial Process Piping. Learning Objectives After completing this chapter, you will...
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Transcript of Chapter 22 Industrial Process Piping. Learning Objectives After completing this chapter, you will...
![Page 1: Chapter 22 Industrial Process Piping. Learning Objectives After completing this chapter, you will –Describe different types of pipe and their respective.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649e1b5503460f94b0a0f3/html5/thumbnails/1.jpg)
Chapter 22
Industrial Process Piping
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Learning Objectives• After completing this chapter, you will
– Describe different types of pipe and their respective uses
– Define methods of connecting pipes– Identify pipe fittings and valves– Identify symbology associated with industrial process
piping
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Part I
Definitions
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Definitions• Piping
– Any kind of conduit used in a wide range of applications
• Plumbing– Small diameter pipes that carry liquids, solids,
or gases• Water• Natural gas• Waste
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Definitions• Process piping
– Transport of fluids between storage tanks and process equipment
• Transportation piping– Carry products hundreds of miles
• Petroleum products• Gases• Coal slurries
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Definitions• Pipe drafting
– Visualization of pipes and fittings in various orthographic and pictorial views
• Double line• Single line
– Most visualization problems for beginners
• Isometric• Flow diagram
– Schematic, non-scale diagram of system layout
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Double- and Single-Line Drawings
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Definitions• Piping drawing
– Most complex• Scale drawing• Provides several views
– Plan– Elevation– Section
• All equipment, dimensions, and notes shown• Drawn from flow diagrams, manufacturer
specifications, and mechanical drawings
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Definitions• Piping isometric
– Pictorial drawing– Illustrates pipe run in three dimensions– Information from piping drawings
• Spool drawing– Drawn orthographically– Shows all pipe and fittings used to assemble a
segment– Usually non-scale
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Part II
Types of Pipe
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Cast Iron and Steel• Most common
– Commercial– Industrial
• Carbon steel– Strong– Relatively durable– Can be welded and machined– Not as expensive as copper
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Copper• Manufactured by hot piercing and rolling• Corrosion resistant• Good heat transfer properties• Expensive• Applications
– Instrument lines– Food processing– Residential water lines
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Plastic• PVC
– Applications• Acids• Salt solutions• Alcohols• Crude oil
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Plastic• Polyethylene
– Temperature resistant to 150°F– Applications
• Water• Vent piping of corrosive and acidic gases• Conduit
– Electrical and phone lines– Water lines– Farm sprinkler systems– Chemical waste lines
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Clay• Corrosion proof
• Applications– Sanitary and industrial sewers– Chemical waste, except hydrofluoric acid
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Glass• Chemical resistant
• Transparent
• Clean
• Applications– Chemical plants– Food and beverage industries– Pharmaceuticals
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Wood• Continuous stave wood pipe
– Used in Pacific Northwest• Redwood and Douglas fir
• Transport of water
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Steel Tubing• Small diameter
• Flexible
• Applications– Boilers– Superheaters– Hydraulic lines
• Automotive• Aircraft
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Pipe Sizes• Availability
– 1/8” to 44” diameter
• Process piping– 1/2” to 24” diameter
• Instrument lines– 1/8” to 1/2” diameter
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Pipe Sizes• Nominal pipe size (NPS)
– 1/8” to 12” diameter• Inside diameter (ID)
– 14” diameter and greater• Outside diameter (OD)
• Inside diameter– (Outside diameter) – 2*(Wall thickness)
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Part III
Pipe Connection Methods
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Pipe Connections• Welded
– Butt-welded– Socket-welded– Solvent-welded
• Screwed • Flanged• Soldered• Bell and spigot
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Pipe Connections• Mechanical unit
• Flaring
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Pipe Fittings• Enable pipe to change direction and size
• Provide for branches and connections
• Types– Welded– Screwed
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Welded Fittings
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Screwed Fittings• Union
– Connection in a straight run of pipe
• Coupling– Attaches two lengths of pipe
• Half coupling– Used for instrument connections
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Screwed Fittings• Street elbow
– 90-degree elbow– Can be attached directly to a fitting
• Bushing– Reducing fitting
• Plug– Seals the screw-end of a fitting
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Screwed Fittings
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Flanges• Creates a bolted connection point
• Circular piece of steel– Contains center bore equal to pipe ID– Several bolt holes spaced evenly around center
bore
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Flanges• Types
– Slip on– Weld neck– Blind– Stub end– Reducing and expander– Orifice
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Flanges
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Valves• Purpose
– Provide on/off service– Control and regulate fluids– Maintain constant pressure– Prevent pressure buildup– Prevent backflow
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On/Off Valves• Gate
– Exclusively provide on/off service– Fluid flows with minimal friction and pressure
loss
• Plug– Cock valve– Requires ¼ turn to open and close– Low throttling ability– Used on small diameter lines
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Regulating Valves• Globe
– Regulates pressure– Fluid flows in “S” pattern
• Angle– Special type of globe valve– Creates 90-degree direction change
• Butterfly– Regulates pressure in low-pressure situations
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Backflow Valves• Check
– Prevent backflow
• Swing check– Similar to gate valve in design– Operates by gravity– Best for low-velocity liquids
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Safety Valves• Keep pressures at or below a given point
– Pop safety• Used for steam, air, and gas lines
– Relief• Used for liquids
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Control• Instantaneous control and adjustment
– Flow– Pressure– Temperature
• Contains a controller, or actuator
• Operation– Electric motor– Air or hydraulic cylinder
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Part IV
Pipe Drawings
![Page 39: Chapter 22 Industrial Process Piping. Learning Objectives After completing this chapter, you will –Describe different types of pipe and their respective.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649e1b5503460f94b0a0f3/html5/thumbnails/39.jpg)
Piping Drawings Requirements• Pipe length dimensions
• Dimension locations
• Location of fittings and valves
• Elevation location of all pipe direction changes in section views
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Piping Drawings Requirements• Size and type of valves and fittings
• Pipe diameter, contents, and identification number
• Pipe flow arrows
• Equipment names and numbers
![Page 41: Chapter 22 Industrial Process Piping. Learning Objectives After completing this chapter, you will –Describe different types of pipe and their respective.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649e1b5503460f94b0a0f3/html5/thumbnails/41.jpg)
Piping Details• Special pipe connections or fittings
• Special valve arrangements
• Small diameter pipe and fitting assemblies
• Special pipe support arrangements
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Piping Details• Tank attachment details
• Minor structural alterations
• Operating and installation procedures
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Piping Details
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Piping Isometric
![Page 45: Chapter 22 Industrial Process Piping. Learning Objectives After completing this chapter, you will –Describe different types of pipe and their respective.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649e1b5503460f94b0a0f3/html5/thumbnails/45.jpg)
Piping Isometric
![Page 46: Chapter 22 Industrial Process Piping. Learning Objectives After completing this chapter, you will –Describe different types of pipe and their respective.](https://reader035.fdocuments.net/reader035/viewer/2022062516/56649e1b5503460f94b0a0f3/html5/thumbnails/46.jpg)
Summary• Piping drawings are used in both
commercial and residential applications
• Piping drawings may be orthographic or axonometric
• Selection of pipe and fittings are application specific