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Old 01-09-2013, 10:36 PM   #21
a1lawng
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Good info. Any idea where I can get the moisture barrier wrap? And would I really need the foil tape for cold transfer if I'm using stainless lines?

 
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Old 01-09-2013, 10:39 PM   #22
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Oh, you mean the whole trunk line is wrapped with moisture barrier, then foil tape? I guess I'm confused about what the foil tape does in that case.

 
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Old 01-09-2013, 10:46 PM   #23
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Quote:
Originally Posted by a1lawng View Post
It seems like these numbers are all over the place. I've found several different resistance values and I've been calculating based on the numbers listed here.

Shouldn't the resistance be calculated based on the ID instead of OD since there are different wall thicknesses on different products?
Both my Foxx and Micro-Matic catalogs list 5/16" O.D stainless at .30/ft. They both don't show the I.D measurment. But it should be close to 1/4", depending on the wall thickness.

 
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Old 01-09-2013, 10:48 PM   #24
JuanMoore
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Quote:
Originally Posted by a1lawng View Post
It seems like these numbers are all over the place. I've found several different resistance values and I've been calculating based on the numbers listed here.

Shouldn't the resistance be calculated based on the ID instead of OD since there are different wall thicknesses on different products?
I touched on this in an earlier reply, but there are a couple reasons the resistance figures are all over the place. One is that the actual resistance of a line will vary quite a bit between different brands/manufacturers, and sometimes even between different production runs at the same factory. Many of those charts just list a rough average, and some actually show a range for each type of line.

The second reason is that line resistance is not a fixed figure like those charts, calculators, and line balancing articles would lead you to believe. It's actually highly variable based on the fluid velocity. The slower the fluid velocity, the lower the resistance will be. That's why doubling the line length will only add a couple seconds to the pour rather than result in a tiny trickle from the faucet.

The problem with using those resistance figures, calculators, and equations is that they all figure a pour speed of ~1 gal/min. That works ok for commercial systems where the beer is kept extremely cold and the carb levels under ~2.9 vol, but many of us homebrewers like to serve our beer warmer, and some like to use higher carb levels for some beers. If you try to serve 45 beer or a beer carbed to 3+ vol that fast you'll end with a glass of foam. If you need to slow the flow down below 1 gal/min for any reason, all of those figures and equations become useless.

And the line resistance is absolutely calculated using the ID of the line, but they list the stainless lines by OD since that's how they're commonly referenced.
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Old 01-09-2013, 10:50 PM   #25
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Quote:
Originally Posted by a1lawng View Post
Oh, you mean the whole trunk line is wrapped with moisture barrier, then foil tape? I guess I'm confused about what the foil tape does in that case.
The foil tape blocks radiant heat transfer to keep the trunk cooler.
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Old 01-09-2013, 10:51 PM   #26
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How many line's are we running????

 
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Old 01-10-2013, 12:28 AM   #27
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Planning to run two beer lines. Only one will be used at first but I'm planning ahead.

 
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