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Dairy processing: Aseptic processing and packaging systems
Feed pump

The feed pump is used to improve flow through the raw regenerator, and to supply the flow control device with milk from the constant level tank to prevent starving, especially if the flow control device is a homogenizer. It also helps to remove negative pressure and subsequent flashing or vaporization in the raw regenerator section. In an APPS, the feed pump normally operates in both forward and divert flow, as long as the flow control device is in operation.

General conditions

  • Has a sanitary design
  • Is in clean and good mechanical condition

The raw product side of the regenerator may be by-passed at start up.

  • Preclude the entrapment of the product in the by-pass line during periods when the feed pump is in operation. For example:
    • use close-coupled by-pass connections (as close as possible: approximately 2.5 times the pipe diameter)
    • design the manually or automatically controlled valve to permit a slight movement of product through the by-pass line

Location

  • Locate the feed pump between the constant level tank and the inlet to the raw product side of the regenerator

Inter-wiring

  • Use a feed pump in conjunction with a pressure differential controller-recorder
  • Inter-wire the feed pump in such a way that it can only operate when the flow control device is "allowed to run", that is, the flow control device has been turned on by the operator or operating system and safety interlocks that may be installed on the APPS are not preventing the flow control device from operating
  • Test the inter-wiring of the feed pump upon installation and at least every 6 months thereafter and after any change in the feed pump or switch circuits occurs
    • keep records to show testing has occurred
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