Here is a very detailed model of an atmospheric day tank typically used for bulk chemical storage and regeneration.
It was built to scale using real-word measurements and CAD drawings as a reference. It was created in 3DS MAX 2011 and uses standard Mentalray materials which can easily be changed. No bit maps are used on the models for hassle free network rendering. The parts are intelligently named and grouped. When possible, object pivot points are placed where they should be for logical animation and parametric objects are left un-collapsed so that you can adjust and animate them, when desired. This model is ready to be dropped into your scenes, animated and rendered.