How can I create hollow pipework? I'm trying to create a length of pipe with includes straight and curved lengths. 

I'm wanting to create a mesh so I can import it into unity, add a mesh collider and run fluid through it.

Does anyone know the best way to approach this?
To model it I would add a cylinder, tab for edit mode, remove the caps of the cylinder.

Then in add and apply a solidify modifier. 

You possibly should also create a simplified pipe with smaller amount of vertices to work as a collision mesh for a  mesh collider, because higher poly pipe might require quite a bit of collision calculations.