This scene was modeled in 3ds Max This model is organized on layers and groups. The model is 100% smoothable and easily editable (TurboSmooth, HyperNURBS modifier).
This model consists primarily of quads
100% all unwrapped non overlapping.
The conduit consists of 8 different modules duplicate and combined between them, with possibility of varying the composition of the duct by moving and dulicating the modules that make up the conduit in the scene.
The entire conduit as seen in the picture, has no overlap of uw and each module including each copy of each has a uw placed in a different position than the others on the area of the texture.
The scene with the 8 isolated modules is not included, But you can easily identify them and combine them by moving the various modules in the conduit.
The rendering is setup in Vray. Lighting is included . I also included a non-illuminated 3ds Max version with standard materials (if you do not use Vray). Lighting is included only in the 3ds Max version and materials may appear different in other program formats.