Hi Brian, I am not sure in what way specifically you are saying it doesn't work out. However, in the case that you are doing a very high lift (such as to an upper floor), you will drop much of the required pressure simply by height, so you need to start with larger diameter line (so that you get lower line losses), otherwise you could end up with a line too short to reach your tap. Have you tried running the calcs on a larger line?

The grease is just any food-grade lubricant, I use "Keg Lube". www.northernbrewer.com/products/keg-lube

Great video but here in the UK all beer lines are sold quoting the outside diameter of the tube. These diameters relate to the John Guest push-fit fittings that are used to connect them. i.e. Tube sold as 3/8” tube has inside dia. of .265”, and 5/16” tube has I/D of .212”, and 3/16” tube has I/D of .117”. Please could someone tell me what the line resistance is for these three tubes bearing in mind that their inside diameters are 0.265”, 0.212”, & 0.117”. I have scoured the internet for this info. but cannot find it anywhere. I really would appreciate it if someone could help with this information. Many thanks Dave Morris (UK)

@@davidmorris5374 I would advise you to just use this website. www.mikesoltys.com/2012/09/17/determining-proper-hose-length-for-your-kegerator/ You can enter any id you want and determine the best length of your beer lines. For home kegerators the best id is usually 3/16" or 0.1875. and usually the length will be around 8-10 feet. But depends on all the other parameters as well. Happy brewing

Hi Mark, thanks for the comment. Without further information about your specific case it is difficult for me to come to any conclusion about why they aren't lining up for you. The video was designed more to explain how all of the parts of the system come together to be balanced rather than to provide a verbatim method for balancing. My goal was to help people properly understand the principles of balancing which can help with troubleshooting etc rather than just providing a number. That said, this is a method which has been used in industry for decades when designing draught systems for pubs and bars. I do know that variation in line losses per foot has always been an issue for methods whereby you use a lookup table as I did in this video because there are so many variances in material, size manufacturer, etc. There are many calculators out there these days can roughly calculate this resistance based on the attributes of the line. I agree that 4.5 to 9ft is a big variation, and would be interested to know what the variables are that have come to such a wide variation.

@@davidmorris5374 Yes, this is a bit of a problem I have come across before. There are quite a few sizes out there that I don't currently have lookup tables for, and I have been thinking about doing some tests to determine real world values for these. Alternatively there are a few calculators out there that can be used to calculate loss per foot based on the material, diameter, specific gravity etc.

Nitro systems probably deserve their own video. One of the benefits of using a nitrogen mix is that the nitrogen is not soluble in beer, so the regulator can run at higher pressures with a lesser degree of over carbonation. This is actually one of the primary reasons pubs often use CellaMix for all beer dispensing where there are long runs. In the case of a porter you would usually be looking around 1.7 - 2.2 volumes of CO2, which would mean around 6-7psi at 38F in a pure CO2 system. However, because you are using a 75% nitrogen mix, you would be able to safely double that pressure without being concerned about over carbonation, meaning if you ran at 12psi you would have adequate pressure for maintaining carbonation on any other kegs you many have running off that regulator. Hope this helps!