The primary purpose of this investigation was to attempt to
determine whether or not the stainless steel pipe line installation of
the Virginia Polytechnic Institute creamery, composed of ordinary stainless steel, could be satisfactorily cleaned by circulation
cleaning procedures as opposed to daily disassembly of the entire
pipe line. To facilitate such a determination, two experimental
periods of approximately thirty days each in duration were set up.
In the first period the experimental pipe line was subjected to
complete daily disassembly cleaning procedures. That is, each section of the line was disassembled, cleaned individually, and
reassembled. In the second period the experimental line was subjected
to in-place cleaning procedures. That is, the line was
left completely intact and cleaning was accomplished by means of
forced circulation of cleaning solutions in a manner comparable to
the way the milk is forced through the line. The cleaning methods
used in the second period necessitated the use or an acid cleaning
solution twice weekly. Sanitizing in the first period was accomplished
by the use of a chlorine rinse before use and in the second
period both chlorine and hot water at 180 ∘F were used. The experimental
installations consisted of fifty-six feet of raw milk
line and twelve and one-half feet of pasteurized milk line.
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