i have a GRP system and a "pipe to pipe" branch (it was an unequal tee but now client changed in pipe to pipe).

when it was an unequal tee, i set sif according to EN ISO 14692-3 (2002), par. D.2.3

Now in nomore an unequal tee.

How can i calculate the sif for "pipe to pipe" GRP branch?

If i don't insert sif, caesar will use "sif=1" but due to wrapping of pipes i imagine sif will be greater than 1.