[Higgins]

I've read here that a trunk with 4 glycol lines in it (10 product and up) is only calculated as 1.5 times as much as a 2 glycol trunk. Just wondering if this is true and what the principle of it is.

We are about to install 4 trunk lines with 10 products in each. They are serving 2 locations from beer Y's off the kegs.
I would love to use a 10 product trunk with only 2 glycol lines but I'm not sure if this would be wise.
The runs are
2 @ 30'
2 @ 50'

Without factoring the 1.5 theory of the 4 line glycol this system would have 120' of glycol per 30' run and 200' per 50' run!
Thats 640' of glycol line!!!
This can't be the proper way to calculate as this would require a 1 horse deck with a few pumps.

What is the proper calculation and can this system be cooled by a 1/2 horse unit with 2 pumps (With either 2 or 4 lines of glycol per trunk)

Thanks