The chart on the back shows the recommended lengths for various pipe types from 1/2" to 1". It worked well at temperatures < 0 F on a much larger pipe when tightly wound. I precalculated the length of the ribbon for each spiral by multiplying the tube diameter * 3.1459 (pi). The number of spirals by taking the total length of the pipe and dividing it by the spacing you want (which is what I guessed). Estimated length by dividing the number of spirals by the length of each spiral. Walk in and everything worked great. I did everything in inches and then converted to feet as a final step.
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