Man - your opening a can of worms.
First thing is your not going to be able to use CO2 on this set up. 100 feet is about 50 feet too far for CO2.
The next thing is you need to test your cooling system before you spend money and time putting the rest of the system together. You need to make sure it can maintain a liquid temp of 38 degrees. Simply having the coolant running at say 35 will not be enough. The LIQUID (beer) temp is all that matters. What do you plan to use for coolant anyway? If you can get the coolant itself to temp out at about 30 degrees at the furthest point from the pump and stay there, then that is a start, but it must stay at that temp.
Until you get your coolant system right you might as well not do anything else.
I will tell you this though, that when you say 'around' 100 ft of line, beer does not understand the word 'around'. You need to know exactly how far the lines will run, that is a critical number in your calculations to get the proper flow rate at the faucet. There are other critical numbers as well, but you need to know the length of the run.
If you do get things running - 5/16 ID beer line will be easier to keep cold, less volume of beer per foot than 3/8" ID.
I don't mean to sound harsh or like I'm shooting holes in your plan, I'm just trying to save you a lot of work. If anything is not right about your set up it will cause you nothing but problems.
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