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Food Science and Technology QUESTION #5929
Question 1
In dairy plant design, 'dead legs' in pipework refers to:
  • Pipes leading to the pasteurizer outlet
  • Sections of piping with no flow during CIP or production, creating zones where milk stagnates and bacteria multiply✔️
  • Pipeline segments used exclusively for water circulation
  • The return flow line of the homogenizer
Correct Answer Explanation
'Dead legs' are sections of pipe beyond the last connection point where no flow occurs during processing or CIP. Good design follows the 3D rule: dead leg length \(\leq 3 \times d_{\text{pipe}}\).