thanks Habib for the reply.

what i'm thinking is after choosing the transverse stiffness i got, the next thing is to look at the vendor catalogue (our material group is currently looking for the manufacturer) and modification shall be done later (with the data from that catalogue)... could the effect be drastic on the piping system? i just hope the length i assume could not be a problem... can you give me a "thumb rule" on choosing lengths?

thanks again. all the best!