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In the collective experience,

Would a 50' coil of 3/8 od copper present too much internal resistance for a simple 15 gal sanke keg based rig?

The coils are merely stacked, no spacers, so not a lot of gradient, but will still have some. I'm repurposing a beer brewing immersion chiller. Want to keep it as intact as possible.

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Edit: by the way, it's going in a 6 gal bucket with constant fresh cold water flow. I am cutting off one of the arms and exiting through the side of the bucket at the bottom, through a bulkhead fitting I made, using copper compression fittings. Just wondering if a piece that long will pressurize the whole rig too much, or at all?