Overview
Stainless steel milk storage tanks are cylindrical vessels designed for the hygienic preservation of milk in dairy supply chains. These tanks serve as critical infrastructure between milk production and processing, maintaining product temperature and preventing contamination. Modern tanks comply with international food safety standards like FDA and EHEDG. They typically include refrigeration units, slow-speed agitators to prevent cream separation, and manholes for cleaning access. Capacities range from 1,000 liters for small farms to over 50,000 liters for industrial dairies.
Structure and Working Principle
The tank consists of an inner stainless steel cylinder (1.5-2mm thickness) surrounded by polyurethane foam insulation (50-100mm) and an outer protective jacket. A compressor-based cooling system maintains 2-4°C through glycol coils or direct expansion. Agitation is achieved via bottom-mounted propeller blades (15-30 RPM) to homogenize milk without damaging fat globules. Advanced models feature IoT temperature monitoring and automatic CIP (Clean-in-Place) systems with rotating spray balls for thorough sanitation.
Key Features
Food-grade stainless steel construction provides corrosion resistance and allows frequent cleaning with acidic detergents. The material's non-porous surface prevents bacterial adhesion, critical for milk storage. Double-wall insulation with PU foam minimizes energy loss, typically achieving <0.5°C temperature rise over 12 hours. Optional features include sight glasses, sample valves, and lactose crystallization prevention systems for extended storage.
Application Areas
Primary applications include farm bulk tanks (receiving raw milk), dairy plant intermediate storage, and transport tanks for milk collection. In cheese production, tanks serve as buffer storage before pasteurization. Specialized versions exist for yogurt fermentation (with heating capabilities) and silo tanks for powdered milk reconstitution. Tropical regions often require heavy-duty insulation and backup power systems.
Maintenance and Precautions
Daily cleaning with alkaline (pH 11-12) and acid (pH 2-3) solutions is mandatory. Inspect seals and agitator bearings monthly, with full system sanitization before seasonal use. Avoid abrasive cleaners that scratch surfaces. Ensure proper grounding to prevent electrolytic corrosion. Temperature logs should be maintained for regulatory compliance, with sensors calibrated quarterly.
B2B Procurement Guide
When sourcing, verify material certificates (mill test reports for steel) and welding quality (continuous TIG welding preferred). For large tanks (>10,000L), request pressure testing documentation. Lead times range from 4-12 weeks depending on customization. Consider modular designs for future expansion. Total cost of ownership should factor in energy efficiency (COP ≥2.5 for refrigeration) and spare parts availability.
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