Here is my Version of the ever popular Segmented Pipes. A staple for interfaces.
1. Create a new layer and make a retangular selection.
2. Select the linear gradient tool and the copper gradient.
3. Drag from the top to the bottom of the selection, you now have a copper pipe.
4. For this excercise we want a chrome pipe, so suck all the color out by going Shift+Ctrl/Cmd+U to desaturate the image. Or select desaturate from the menu.
5. Now to make it more shiny chrome, open our famous curves box and use a similar curve.
6. And we now have a shiny Chrome pipe..
7. To add the segments: Create a new layer and draw a 2 pixel line in black.
8. Duplicate the layer and press Ctrl/Cmd+I to invert the color, press the right keyboard arrow key 2x to nudge the white line over. Change it to overlay mode in the layer mode menu.
Link the 2 lines and merge linked.
Alt/Option+Shift and drag the lines to duplicate them along the pipe.
9. Here is a finished one with some color added by using hue/saturation with the colorize box checked.
More Tutorials: 
