A bulk milk cooler (also called a milk cooling tank or milk chiller) is a direct-expansion refrigeration unit designed to rapidly cool fresh raw milk from its natural post-extraction temperature of approximately 35°C to a safe storage temperature of 4°C  within 3 hours of collection.

This rapid cooling is critical because fresh milk has only a limited natural resistance to bacterial growth. Without cooling to 4°C within this window, microbial activity accelerates rapidly, degrading milk quality and reducing shelf life irreversibly.

Bulk milk coolers are the primary cooling solution used at village-level dairy cooperative societies, farm collection centers, and rural milk chilling plants across India, where milk is collected twice daily from small producers and held until transport to processing dairies.

We offer a range of Milk Cooling Tank which is also known as Bulk Milk Coolers. Owing to the rich industrial experience, we are leading manufacturer of Bulk Milk Coolers. Bulk Milk Coolers are direct expansion type, range 300 litres to 5000 litres. These milk cooling tanks are for installing at village Dairy Cooperative Society which collects the milk everyday in the morning and evening from milk producers. The Milk collected shall be stored in the bulk milk cooler and cooled from the ambient Temperature to 4 degree centigrade within 3 hours.

Our Milk cooling tank is mainly used in preserving and storing fresh raw milk. The cooled raw milk can reach rapidly needed temperature of 4-5°C and keeps constant, which can prevent the generation of bacteria and keep raw milk in good condition. These excellent bulk milk coolers, which help in improving milk quality by cooling it at collection, center it before it gets transported to the dairies.

About Mahesh Eng. Works — Bulk Milk Cooler Manufacturer in India

Mahesh Eng. Works is a leading manufacturer of commercial dairy equipment and bulk milk coolers in India, supplying a complete range of direct expansion milk cooling tanks from 300 litres to 5,000 litres capacity. Our bulk milk coolers are designed specifically for installation at village dairy cooperative societies and rural collection centres, where milk is gathered from individual producers in the morning and evening sessions.

Mahesh Eng. Works is largest Commercial Dairy Equipment and Bulk Milk Cooler Manufacturer in India. Rapid and efficient milk cooling is essential for preserving milk quality. Milk leaves the udder at approximately 35°C and the heat in fresh milk must be quickly removed. Milk retains a natural resistance to bacteria immediately after extraction, but only rapid cooling to a storage temperature of around 4°C to 6°C, prevents or minimizes further micro-organism growth.

Features :

• Faster cooling owing to direct expansion
• Conforms to ISO 5708 2A II- latest version
• Robust design
• Durable tank made of AISI 304 SS
• Hermetically sealed compressor
• Digital temp controller
• Occupy minimum space
• Energy conscious
• Designed to be user friendly

Technical Specifications — Model Range

1.What is a bulk milk cooler?
A bulk milk cooler is a refrigerated stainless steel tank that rapidly cools fresh raw milk from about 35°C to 4°C within 3 hours. This prevents bacterial growth and preserves milk quality at the collection point before transportation to dairy processing plants.

2. How does a bulk milk cooler work?
A bulk milk cooler works by rapidly removing heat from fresh milk using a refrigeration system. Warm milk (around 35°C) enters a stainless steel tank, where a compressor circulates refrigerant through evaporator plates or coils. This absorbs heat and cools the milk to 4°C within 3 hours while an agitator ensures uniform temperature.

2.How fast can a bulk milk cooler cool milk?
A standard direct expansion bulk milk cooler reduces milk temperature from around 35°C to 4°C within 3 hours. This cooling speed meets international dairy safety standards for hygienic milk storage.

3. Is a bulk milk cooler different from a milk chiller?
No, both terms refer to the same equipment. A bulk milk cooler or milk chiller is used to cool and store raw milk at 4°C–6°C using refrigeration systems such as direct expansion or ice bank technology.

4. What capacity bulk milk cooler is required for a dairy cooperative?
The required capacity depends on milk collection volume per session:

500 litres: up to ~450 litres collection
1,000 litres: medium cooperatives
2,000 litres: large collection centres
5,000 litres: high-volume operations

Choosing slightly higher capacity than current volume helps handle future growth.

5. What material is used in bulk milk coolers?
Bulk milk coolers are made using food-grade AISI 304 stainless steel for the inner tank and outer body. This material is corrosion-resistant, hygienic, non-reactive with milk, and suitable for long-term dairy use.

6. Which refrigerant is used in bulk milk coolers?
Most bulk milk coolers use refrigerants like R-22 or newer alternatives such as R-410A, depending on the model and environmental regulations. Always confirm the refrigerant type before purchase.

7. What is ISO 5708 in bulk milk coolers?
ISO 5708 is an international standard that defines performance requirements for bulk milk coolers. It ensures the equipment can cool milk from 35°C to 4°C within 3 hours and maintain safe storage conditions consistently.

8. Which compressor is used in bulk milk coolers?
Bulk milk coolers typically use hermetically sealed compressors from reliable brands like Danfoss or KCL. These compressors are known for durability, energy efficiency, and easy service availability.

9. How is milk quantity measured in a bulk milk cooler?
Milk volume is measured using a calibrated dip stick or measuring rod. This allows accurate recording of milk quantity directly inside the tank without additional equipment.

10. Can bulk milk coolers be used in village dairy cooperatives? Yes, bulk milk coolers are designed for village dairy cooperative societies. They are compact, easy to operate, and suitable for twice-daily milk collection in rural environments.

11. How often should a bulk milk cooler be cleaned?
A bulk milk cooler should be cleaned after every milk collection cycle, usually twice daily. Regular cleaning using CIP systems or manual washing ensures hygiene and prevents contamination.

12. What is the price of a bulk milk cooler in India?
Bulk milk cooler price in India typically ranges from ₹1.5 lakh to ₹18+ lakh, depending on capacity, cooling technology, compressor brand, and build quality. Small 300–500 litre units are budget-friendly, while 5,000 litre systems are designed for large dairy operations.