Binh Dinh is the largest tuna fishing capital in Vietnam, with a formidable fleet of offshore fishing vessels. Quy Nhon, Hoai Nhon (Tam Quan), Phu My, Annual catches exceed 12,000-15,000 tons. To preserve the original vibrant red color of the tuna, ensuring it meets Sashimi quality standards for export to Japan, the United States, and Europe, fetching 3-5 times the price of regular frozen tuna, a deep-freeze system at sub-zero temperatures is used. -50°C to -60°C It is a mandatory technical standard.
Tan Long Refrigeration and Electrical Engineering Joint Stock Company as a pioneering EPC general contractor providing solutions Ultrasonic deep freezing cold storage for tuna and seafood preservation warehouse in Binh Dinh.. We have mastered the technology of two-stage refrigeration compression and intensive refrigerant cascade, perfectly meeting the most stringent requirements of the international market.
1. Why must tuna for sashimi be deep-frozen at -50°C to -60°C?
Tuna meat contains extremely high levels of the pigment myoglobin. Under normal storage conditions (-18°C to -20°C):
- Myoglobin oxidation phenomenon: Myoglobin denatures into metmyoglobin, causing the meat fibers to change from a bright red to a dull dark brown in a short time, completely rendering it unsuitable for eating raw as sashimi.
- Eutectic freezing point: At temperatures of $-50^circ ext{C}$ to $-60^circ ext{C}$, all the water bound inside the tuna cells freezes instantly into ultrafine crystals, inhibiting the activity of enzymes that break down and oxidize fats. When thawed, the meat retains its elasticity, natural sweetness and richness, and vibrant red color as if it were just caught from the ocean.
💡 Breakthrough in Tan Long's 2-stage refrigeration technology in Binh Dinh:
Using a two-stage compression cycle combined with an auxiliary refrigerant cooling tank (Subcooler), the compressor operates at an optimal compression ratio, preventing discharge overheating and saving more than 25% of electricity compared to traditional patchwork units.
2. Technical Specifications Table for Specialized Cold Storage Systems in Binh Dinh
| Cold storage system | Room temperature | Refrigerant | Panel shell structure | Product application |
|---|---|---|---|---|
| Sashimi ultra-deep freezer | -50°C to -60°C | R23/R404A or two-stage NH3 | PIR panels are 175-200mm thick. | Whole tuna fillets for sashimi, exported to Japan. |
| Deep freezer storage for tuna | -45°C to -50°C | R507A / NH3 2-stage | PIR panel thickness: 150-175mm | Long-term storage (12-24 months) without discoloration. |
| Quy Nhon fishing port cold storage facility | -22°C to -25°C | R404A / Eco-friendly Freon | PIR panels with a thickness of 125-150mm. | Squid, mackerel, and shrimp are commonly exported. |
3. Standard B2B Equipment Configuration Recommended by Tan Long
- Two-stage screw/piston compressor unit: Use specialized compressors. Mycom Mayekawa (Japan) or Bitzer (Germany) Optimized for ultra-cold temperature ranges.
- PIR panel casing with superior insulation: High-density PIR core (42-45 kg/m³), brushed 304 stainless steel or salt-resistant Colorbond sheet metal surface, and tight-fitting double Camlock connection 100%.
- T-Light Stainless Steel 304 Deep Recessed Cold Storage Door: 150mm thick PIR insulation layer, 4-way heating element for the door seal to prevent freezing and jamming.
- SCADA system for automatic control: Multi-point temperature monitoring and operational history logging for traceability and export inspection purposes.
4. Estimated Price List for Cold Storage in Binh Dinh (B2B)
| Capacity | Actual volume | Main device configuration | B2B Budget |
|---|---|---|---|
| Tuna storage capacity: 10-25 tons | 60 – 150 m³ | Bitzer 2-stage assembly, 150mm PIR panel, T-Light stainless steel hinged door. | Detailed technical cost breakdown based on floor plan. |
| Fishing port storage capacity: 50-200 tons | 300 – 1,200 m³ | Screw compressor unit, Corrosion-resistant evaporator, 150mm PIR panel, Sliding door | Prepare technical design documents and Bill of Quantities (BOQ). |
| Processing plant with a capacity of 500 – 3,000+ tons | 3,000 – 18,000+ m³ | Mycom 2-stage NH3 compression station, -50°C deep freezing chamber, SCADA Cloud | Turnkey EPC general contractor |
👉 Field technical support: Tan Long engineers were present in Quy Nhon City, Tam Quan, Hoai Nhon, and Phu My within the following timeframe: 24 hours.
5. Proof of Tan Long's Practical Project Capabilities
- Automated warehouse general contractor NECS (102,642 pallets) and AJ Total (31,000 pallets).
- Mechanical and electrical engineering partner for seafood processing plants. Frescol Tuna 12,000 MT, APT Saigon Seafood.
6. Standard 7-Step EPC Construction Process
- Conducting field surveys of fishing ports and measuring the layout of processing plants in Binh Dinh.
- Thermodynamic calculations for a two-stage compression cycle to optimize the compression ratio.
- We provide transparent cost breakdowns for materials and supply CO/CQ certificates for imported equipment.
- Fabrication of PIR panel casings and T-Light ultrasonic insulation doors at Tan Long factory.
- Transportation and direct installation of high-pressure pipe welding, and nitrogen inert gas pressure testing.
- Deep vacuuming was performed, refrigerant was charged, and a test run was conducted to achieve a chamber temperature of -50°C.
- Handover of operation, instruction on routine maintenance, and 24/7 warranty activation.
7. Frequently Asked Questions (FAQ)
1. How expensive are the electricity costs for operating a -50°C freezer?
Due to the high compression ratio, the power consumption is higher than that of conventional warehouses. However, with Tan Long's 2-stage compression cycle technology and 200mm thick PIR panel casing, the system minimizes heat loss, saving 20% – 25% of electricity compared to conventional designs.
2. Does Tan Long provide flint stones for preserving fish on offshore tuna fishing vessels?
Yes. Tan Long directly manufactures the seawater flake stone crushers installed on tuna fishing vessels at Tam Quan fishing port, Quy Nhon, to preserve fish right at sea before transferring them to deep-freezing warehouses on shore.
Investment in -50°C Cold Storage for Ocean Tuna in Binh Dinh
Contact Tan Long Engineers today to receive specialized ultra-low temperature cold storage solutions for exporting tuna sashimi.
Cold Storage Construction Project in Adjacent Areas of the Central Coast
The coastal strip boasts deep-water ports, centers for catching and processing tuna, lobster, medicinal herbs, and trans-Asian logistics. Tan Long's engineering team is ready to conduct on-site surveys and provide technical support within 24 hours.
Engineer Nguyen Toan Thinh (Technical Director)
With over 18 years of practical experience in directing, consulting, designing, and constructing heavy industrial refrigeration systems, ASRS automated warehouses, and IQF freezing systems across more than 29 major national projects.
