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

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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.

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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