Dairy Establishment Inspection Manual – Chapter 17 - Higher Heat Shorter Time (H.H.S.T.) Processing and Extended Shelf-Life (ESL) Dairy Products
1.17.04 Feed Pump
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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 H.H.S.T. systems, the feed pump normally operates in both forward and diverted flow, as long as the flow control device is in operation.
1.17.04.01 General Conditions
A feed pump must be of sanitary design. The pump must be clean and in good mechanical condition.
The raw product side of the regenerator may be by-passed at start up. Entrapment of the product in the by-pass line during periods when the feed pump is in operation shall be precluded by:
- Close-coupled by-pass connections. (i.e. as close as possible: approximately 2.5 times the pipe diameter).
- Design of the manually or automatically controlled valve which will permit a slight movement of product through the by-pass line.
- Other equally effective system.
The feed pump shall be located between the constant level tank and the inlet to the raw product side of the regenerator.
Where a feed pump is used, a pressure differential controller-recorder is required and shall be inter-wired in such a way that it can only operate when the flow control device is allowed to run i.e. the F.C.D. has been turned on by the operator or operating system and safety interlocks that may be installed on the H.H.S.T. system are not preventing the F.C.D. from operating.
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