METHOD AND CLEAN-IN-PLACE SYSTEM FOR CONVEYING TUBES
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United States of America Patent
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Issued Date -
Oct 4, 2018
app pub date -
Feb 28, 2018
filing date -
Feb 28, 2018
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Abstract
In a tube cleaning system and method, multiple steps can be run with a single pass by using a combination pig train. For example, an initial combination pig train may include a plurality of bristle pigs and polymer trailing pigs with a cleaning solution between each pair. One example is a first leading bristle pig and a first trailing polymer pig containing a first slug of caustic cleaning solution followed by a second bristle pig and second polymer trailing pig containing a second slug of caustic cleaning solution. Another example is a leading bristle pig, a middle bristle pig, and a trailing polymer pig with a cleaning composition disposed between the leading and middle bristle pigs and a cleaning composition disposed between the middle bristle pig and the trailing pig. Such combination pig trains are moved through the tube to be cleaned in a single pass to achieve two cleaning steps.
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