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Making the Grid Visible in Adobe Illustrator
The first step in this tutorial is making the grid visible. Open a new Adobe Illustrator CS4 document and make the grid visible. To do this, click "View" on the menu bar and then click "Show Grid". Another way to do this is to press <Control><"> simultaneously. The grid should now be visible on the canvas. Later on, the grid will be used as a guide to connect corners of the pipe using the arc tool. (Click any image for a larger view.)
Change the grid properties by clicking "Edit" on the menu bar and then "Preferences" (or press <Control><K>). Use the combo box to select "Guides and Grid". Here you can set the properties of the grid according to your needs. For this example, set the grid to a line every 32pt and 64 subdivisions. Click "OK".
You might find the "Snap to Grid" function useful here. To turn it on, click "View" on the menu bar and then "Snap to Grid". This can also be done by pressing <Shift><Control><"> on the keyboard.
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Draw a Pipe
Begin drawing the pipe by creating one horizontal line and then one vertical line offset from the first by one section of the grid horizontally and one section vertically using the pen tool.
Next, grab the arc tool and connect the two lines with an arc. Use the direct select tool to select the end points of the vertical line and the arc. Right click and chose "Join" (or press <Control><J>) on each end of the arc to connect the lines and the arc together. The outline of the inside edge of the pipe is now drawn.
Repeat the above steps by drawing another set of lines one grid section above and to the right of the first lines. Separate them by two grid sections horizontally and vertically. Create an arc and join the lines as done with the first line.
Close off both ends of the drawing using the pen tool. Be sure to connect the endpoints. You now have a pipe section with a 90 degree bend.
Next, draw a straight segment and a fitting. Do this by drawing a straight section of pipe using the rectangle tool. Draw a small rectangle to show the fitting. Group the straight section and the fitting.
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Add Color, Assemble Pipes
Color the pipes as desired. In this example, the pipe is colored with a 45% gray fill and a black 1 pt stroke. Copy, paste and transform the pieces of pipe as needed. Depending on your illustration, you may need to create pipes that are at other angles. Right click and select "Arrange" as necessary to bring sections to the front or send them to the back as needed. You now know how to draw pipes in Illustrator.