The efficiency of a holding tube depends on the size of pipe used and the velocity of flow through the tube. Tests conducted on glass and metal pipe in sizes from one to four inches in diameter showed that, for a given capacity, highest efficiency can be obtained by constructing the holding tube of the smallest practical size of pipe. There was no difference between the efficiencies of comparable glass and metal holding tubes.

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Author notes

Dr. W. K. Jordan is an Assistant Professor of Dairy Industry at Cornell University. He did his undergraduate and graduate work at Cornell and received his Ph.D. degree in 1950. During World War II he served in the United States Army for three years. At present he is conducting further research on problems concerned with short-time high-temperature pasteurization.