In my case i have a tank, which as both insulation and double wall, In this case how can take reduction factor.
I have calculated the reduction factor for insulation and then double wall and multiplied to get the overall reduction factor, but i am not sure is my approach is right.
Next my concern is how to calculate the hydrocarbon content in the tank breathing as the tank is N2 padded. Can i calculate based on raoult's law? or need to go by AP-42. I have also attached my calculation sheet as reference.
Thanks a lot for your support in clarifying my doubts.