If the material you are dealing with is not fibre reinforced, it will behave similarly to any metal, but is much less stiff. Expect a very low modulus, take properties from good vendor catalog such as George Fischer. You will have small spans between supports and the need for constant support (usually channel) under small bore runs. Look at the vendor's own pipe supports to save making special designs. If valves are metal, they will usually need their own supports.