If you plan on using the same pipes over and over again I would STRONGLY STRONGLY STRONGLY suggest that you instance duplicate them. Instanced copies are exact copied of their original and can only be translated, rotated, and scaled. Any vertice adjustment on either the original or the instanced copy will modify both the original and the instanced copy.

Here's why instanced copies are so good: They take up a LOT less space. If you just regular duplicate each pipe, with that many pipes, your computer will slow down emensly. If you use instanced copies, Maya will run much smoother and your file size will be incredibly small as opposed to you not using instanced copies.

The only reason I suggest this is because you will be having so many of the same object. Oh, and before I go, you make instanced copies by choosing the options box under Edit>Duplicate. Simply check the box for instanced copies.