Commercial circulation cleaning of welded pipelines is extremely effective in removing milk solids. After normal rinsing only approximately 2.6 g of milk solids could be found in an average circuit cleaned with 165 gallons of cleaning solution. This quantity of milk solids relative to the volume of the equipment involved had little if any effect on the growth of microorganisms. The small amount of milk solids left in pipelines after cleaning was not high enough to cause any dissipation of chlorine. A new approach to sanitizing a pipeline system by leaving in the lines overnight a chlorine solution of 1.0 – 2.5 ppm concentration is discussed.

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Author notes

1Published with the approval of the Director as paper No. 1074, Journal Series, Nebraska Agricultural Experiment Station.

2Supported in part by a grant from Safeway Stores, Inc.

3First in a series of papers given in a panel discussion on “Industrial Uses of Welded Pipelines,” presented at the 47th Annual Meeting of the International Association of Milk and Food Sanitarians, Inc., October 26–29, 1960, Chicago, Illinois.