DPC 108, Guidelines for Proper Cooling of Milk on Dairy Farms

Item #: DPC-108

Published: 2012

Pages: 25

This guideline provides information pertaining to methods and equipment for cooling milk on the farm. Recommendations are included as aids in selecting equipment and maintaining cooling systems, including precoolers. Pertinent regulations and state recommendations are presented for reference. Emphasis is placed on auxiliary equipment and/or operations which produce high quality milk while saving energy. Definitions of useful terms are in the Appendix.

DISCLAIMER: The DPC is not responsible for the use or application of the information provided in this Guideline. It is the responsibility of the user to ensure that the information addresses their needs and that any action taken complies with appropriate regulations and standards.

Table of Contents:
Introduction
APPROVAL REQUIREMENTS
OVERVIEW - FARM MILK TANKS & HEAT EXCHANGERS
MILK TANKS, AGITATORS & RECORDING THERMOMETERS
     Sizing Farm Milk Tanks
     Types of Tanks
     Open tanks
     Closed tanks 
     Silo tanks
     Recording Thermometers
     Standards for Recording Thermometers
     Mixing Milk
IN-LINE COOLERS
     Partial Cooling with Well Water
     Water for in-line coolers
     Operation and Types
     Plate coolers
     A buffer tank
     Complete Cooling of Milk
     Precooler Sizing Considerations
     Pre-cooler Installation
     Pre-cooler Operation and Maintenance
     Cleaning In-Line Coolers
     Water System Protection
     Chilled Water Systems
     Treatment of Chilled Water
BASICS - REFRIGERATION & MILK COOLING
INSTALLATION OF COOLING SYSTEMS
     Air cooled condenser units
     Farm milk tanks
     Install Heat Recovery Unit
COOLING SYSTEM MAINTENANCE
     Early Warning Signals
     Refrigeration Compressors
     The Air-Cooled Condenser
     Water-Cooled Condensers
     Detecting Refrigerant Leaks
     A Sight Glass
     A Moisture Indicator
     Touch Hot and Cold Lines Carefully
APPENDIX I: Definitions of Selected Terms
APPENDIX II: Example -- Sizing Milk Cooling Systems
APPENDIX III Quick Checks for Milk Cooling Systems
Table 1. Bacterial Growth in Raw Milk Held for 24 Hours at Different Temperatures
Table 2. HEAT RECOVERY SYSTEMS
Figure 1. In-line Tube Coolers
Figure 2. In-Line Plate cooler
Figure 3. Installation of a Pre-cooling Plate with Discharge Water to a Watering Tank
Figure 4. Installation of a Pre-cooling Plate with a Water By-pass to Watering Tank
Figure 5. Installation of a Pre-cooling Plate with Discharge Water to a Watering Tank
Figure 6. Installation of a Plate Cooler with Re-circulated Hot Water for Temperature Maintenance
Figure 7.  Backflow Prevention Assemblies
Figure 8. Typical Refrigeration System
Figure 9.  Optional Locations of Compressor/Condenser For Efficient Operation
Figure 10. Refrigeration System with Heat Recovery and Water Heater

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DPC 108, Guidelines for Proper Cooling of Milk on Dairy Farms

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