Hi
I have to use GRP In pipe stress analysis.
My question is whether GRP material is in built in material database or should i have to create a "user defined material"?

For example, (102) is A53B... similarly, what material should i choose?

Material (20) FRP (Fiber reinforced plastic) is a generic FRP material. Choosing this material gives you some extra material parameters to enter.
Be sure that you enter all values correctly according to the suppliers specs.
Also don't forget to set some parameters in the "special execution options" dialog.

Thanks for the swift reply

You can select FRP but be paricular about the piping code you are using.