There are a lot of topics in this forum regarding the codes to be used for FRP analysis.
Currently there are three codes (UKOOA, BS7159 and ISO14692) supported by CAESAR II. B31.3 has a chapter on non-metallic piping (so do other piping codes), but this is not effective for analysis. Firstly because it's incomplete, secondly because CAESAR II uses the steel part of the code for the analysis.

I disagree with CraigB regarding the problem getting the correct piping properties. Especially vendors with certified product ranges (like Ameron and Wavin) have all the info you need available in their datasheets.

What is much more important is that you have knowledge of the behaviour of this specific material. There is a great deal of difference between steel and FRP and this also results in different piping designs.

First make sure you understand material behaviour and the way the code you're using handles this behaviour. Then start finding material properties and carefully start your first analysis.