Technical Engineering Summary: Shrimp Cold Storage
Shrimp represents an exceptionally high-value export commodity that is acutely vulnerable to temperature fluctuations and ice crystal sublimative moisture loss (freezer burn). Tan Long turnkey shrimp cold storage systems optimize three critical parameters: ultra-stable sub-zero temperature, airtight vapor-sealed envelopes, and high relative humidity. Tan Long high-performance export shrimp cold storage focuses on three core pillars: 1) Ultra-rapid blast freezing (-38°C to -42°C) to form micro-fine ice crystals that do not tear delicate shrimp myofibrillar muscle fibers; 2) Deep freeze storage holding ultra-stable at -22°C to -25°C with fluctuations under ±0.5°C; and 3) Low-velocity gentle laminar airflow evaporators preserving 100% of the protective ice glaze against melanosis and black-spot oxidation.
1. Temperature Standards & Export-Grade Shrimp Freezing Protocol
Across the cold seafood supply chain, raw black tiger shrimp (Penaeus monodon) and whiteleg shrimp (Litopenaeus vannamei) must undergo rapid blast freezing within 2 hours of harvest and continuous deep freeze storage at -20°C to -25°C to preserve myofibrillar protein integrity. Substandard cold storage temperatures or humidity expose shrimp to three severe commercial risks:
Endogenous polyphenoloxidase (PPO) enzymes in shrimp heads and viscera remain active above -15°C, catalyzing oxidation of tyrosine into melanin (black spot melanosis defect). Continuous storage at -20°C or lower effectively suppresses enzymatic darkening.
When relative humidity drops below 85% or high-velocity discharge blows directly over cartons, ice sublimates into room air, creating spongy muscle tissue, causing 2% to 5% weight loss, and resulting in tough, dry meat after thawing.
Thermal swings exceeding ±3°C to ±5°C from poor defrost management or door traffic cause small ice crystals to melt and recrystallize into large jagged shards, puncturing actin-myosin myofibrils and causing excessive drip loss during cooking.
To eliminate these risks, Tan Long export shrimp cold storage facilities synchronize optimum thermal envelopes tailored to each commercial product specification:
| Commercial Product Form | Freezing Temperature | Storage Room Temperature | Storage Shelf Life | Mandatory Technical Protocol |
|---|---|---|---|---|
| Block Frozen Shrimp (HOSO/HLSO) | -35°C to -40°C (Contact Freezer) | -20°C ÷ -22°C | 18 - 24 Months | Water glazing filling around blocks, sealed heavy-duty PE barrier |
| Individually Quick Frozen (IQF) Shrimp | -38°C to -42°C (IQF Freezing Tunnel) | -22°C ÷ -25°C | 12 - 18 Months | Protective ice glaze 5% - 12%, QR code export traceability labels |
| Cooked Frozen Shrimp | -35°C to -40°C (Solid Belt IQF) | -22°C ÷ -25°C | 12 - 15 Months | Pre-cool core temperature to +4°C prior to freezing; preserve vibrant red pigmentation |
| Breaded / Value-Added Shrimp | -38°C (Spiral IQF Freezing Line) | -20°C ÷ -22°C | 12 Months | Vibration-damped transit preserving fragile batter/crumb coatings |
2. Deep Freeze Subsystem Configuration: Screw Compressor Rack & 150mm PIR Panels
With over 20 years of proven EPC delivery for seafood facilities ranging from 50 to 10,000 tons across the Mekong Delta aquaculture belt (Ca Mau, Bac Lieu, Soc Trang, Kien Giang), Tan Long engineers heavy-duty systems built to withstand aggressive saline marine humidity:
2.1. High-Density PIR/PU Sandwich Panels: Moisture-Proof & Fire-Retardant
Shrimp cold storage thermal envelopes utilize 100% Polyurethane (PU) or Polyisocyanurate (PIR) panels certified to fire resistance Class B1 under QCVN 06:2022/BXD:
- 150mm Deep-Freeze PIR Thermal Envelope: High-pressure injected density of 42-45 kg/m³, ultra-low thermal conductivity λ = 0.020 W/m.K, preventing 100% heat infiltration at -25°C.
- Heavy-Duty Continuous Mycom/Bitzer Screw Racks: Engineered for deep freeze black tiger and whiteleg shrimp; equipped with 99.9% multi-stage oil separators preventing oil film fouling in evaporators.
- Industrial Evaporators with Hot Gas Defrost: Heavy-gauge copper/aluminum or hot-dip galvanized steel coils resisting marine salt spray, with rapid automatic hot gas defrost holding room delta-T minimal.
- T-Light Heavy-Duty Sliding Cold Room Doors: Monolithic injected PU door leaves with perimeter perimeter heating cables preventing gasket freeze-up, gliding effortlessly even at -28°C.
2.2. Specialized Low-Temperature Screw Compressor Stations
To ensure uninterrupted 24/7/365 operation without capacity degradation, Tan Long packages 100% genuine imported compressor units from world-class leaders:
- Kobelco Screw Compressor Racks (Japan): Single or two-stage compound screw series delivering superior COP at evaporating temperatures of -30°C to -45°C. Exceptionally smooth operation with bearing life exceeding 50,000 running hours.
- Mycom / Mayekawa Compressor Systems (Japan): The global benchmark for large-scale shrimp processing plants utilizing natural Ammonia (NH3/R717) or low-GWP eco-refrigerants R404A/R507A.
- Bitzer Screw Compressor Racks (Germany): Semi-hermetic screw series with VFD variable frequency control, automatically modulating capacity from 25% to 100% based on thermal load, slashing power bills by 25%.
2.3. Low-Velocity Evaporators & High-Efficiency Hot Gas Defrost Loops
Tan Long shrimp cold storage evaporators feature wide fin spacing (9 - 12 mm) (Fin spacing 8mm - 12mm) to minimize frost accumulation during cargo transit. Evaporator casings are fabricated from powder-coated aluminum or SUS304 stainless steel, with low-RPM wide-diameter fans providing gentle airflow that prevents surface glaze erosion.
The system supports heavy-duty electrical defrost or automated hot gas defrost from compressor discharge lines, reducing defrost cycles to under 25 minutes while holding room temperature rise under 3°C.
2.4. Heavy-Duty Forklift-Bearing Reinforced Slab & Anti-Frost Heave Insulation
For industrial shrimp cold stores operating 2 to 3-ton forklifts, heavy-duty floor slabs feature 150mm - 200mm reinforced concrete poured over underfloor PU insulation:
- Underfloor PVC ventilation duct matrix or automated heating cables to eliminate subfloor frost heave risk.
- Dual-layer heavy-duty polyethylene (PE) vapor barrier stopping ground moisture capillarity.
- Polished concrete treated with silicate hardener or non-slip antibacterial epoxy coating complying with HACCP standards.
3. Turnkey Budget Estimate Matrix for Shrimp Cold Storage by Metric Tonnage (2026)
Investment budgets depend on tonnage capacity, product packaging (block frozen vs. IQF), and compressor rack configurations. Below is Tan Long’s 2026 turnkey indicative pricing matrix:
| Shrimp Capacity (Tons) | Dimensions L x W x H (m) | Compressor Horsepower (HP) | Temperature Range | Turnkey Budget (VND / USD Approx.) |
|---|---|---|---|---|
| 10 - 15 Tons | 6.0 x 4.0 x 3.0 (72 m³) | 7.5 - 10 HP | -20°C ÷ -22°C | 160.000.000 - 210.000.000 |
| 30 - 50 Tons | 10.0 x 6.0 x 3.5 (210 m³) | 15 - 20 HP | -20°C ÷ -25°C | 320.000.000 - 430.000.000 |
| 100 - 150 Tons | 16.0 x 10.0 x 4.5 (720 m³) | 40 - 50 HP (Screw Compressor) | -22°C ÷ -25°C | 750.000.000 - 980.000.000 |
| 300 - 500 Tons | 25.0 x 16.0 x 5.5 (2.200 m³) | 100 - 125 HP (Dual Parallel Screw) | -22°C ÷ -25°C | 1.850.000.000 - 2.500.000.000 |
| > 1,000 Tons (Logistics Hub) | Custom Pallet / High-Bay ASRS | Central NH3 / Freon Screw Station | -25°C Stable | Custom Survey & Engineering |
* Turnkey package includes: Compressor condensing unit, 150mm PU/PIR panels with SUS304/coated steel facings, heated sliding cold room doors, automated inverter PLC panel, IP66 waterproof refrigeration LEDs, and complete installation labor. Excluding VAT and external warehouse civil building construction.
4. Six-Step EPC Turnkey Construction Workflow for Shrimp Cold Storage
Every seafood cold storage project delivered by Tan Long adheres to stringent ISO 9001:2015 quality control protocols:
- Site Inspection & Thermal Load Calculation: Tan Long refrigeration engineers analyze site dimensions, daily turnover tonnage, and core input temperatures (+10°C vs -18°C) to size compressor power precisely, avoiding energy waste or cargo thawing.
- 2D/3D Engineering Layout & Technical Specification: Detailed layout drawings for cold chambers, anterooms preventing thermal ingress, forklift aisles, and refrigerant pressure piping schematics.
- Factory Prefabrication & Equipment Staging: PIR panels pre-molded at Tan Long’s Long An factory; Kobelco/Bitzer screw compressor racks packaged on heavy structural steel bases, pressure tested with dry nitrogen at 28 bar before dispatch.
- Chamber Assembly & Refrigeration Piping Integration: Erecting camlock panels, pouring heavy-duty reinforced subfloors, and orbital welding seamless pressure piping to ASME Boiler & Pressure Vessel codes.
- Deep Vacuum Dehydration & Pure Refrigerant Charging: Deep vacuum pull-down below 500 microns, charging genuine virgin refrigerant with verified CO/CQ certificates, and introducing synthetic low-temp lubricant.
- Full Load Commissioning, Thermal Calibration & Handover: Pulling down room temperature to -22°C within 4 to 6 hours. Testing operating amperage, compressor vibration frequencies, training client facility engineers, and executing 24-month comprehensive warranty handover.
5. Frequently Asked Questions on Shrimp Storage & Operations (FAQs)
Q: Can a holding cold room be used to freeze fresh raw shrimp directly?
Strongly not recommended. Holding freezers are engineered with gentle air speeds and cooling capacities sized only to maintain pre-frozen products (-20°C). Introducing warm fresh shrimp (+10°C to +25°C) extends freezing time to 15-20 hours, generating large cellular ice needles that shred muscle fibers while releasing latent heat that melts adjacent frozen cartons. Products must always pass through a -38°C blast freezer or contact plate freezer before entering the holding room.
Q: Why should shrimp cold rooms use SUS304 stainless steel instead of conventional coated steel?
Shrimp processing environments carry heavy airborne sea salt moisture and chemical washdown residue (chlorine, sanitizers). Standard pre-painted steel will rust at seams within 2 to 3 years, causing paint flaking that violates HACCP food safety standards. SUS304 stainless steel features high chromium and nickel content, offering impervious sea-salt corrosion resistance, a 20+ year lifespan, and easy high-pressure sanitization.
Q: How much electricity does an industrial shrimp cold storage consume per month?
Power consumption depends on envelope thermal resistance and compressor technology. With 150mm PIR panels and inverter-driven Kobelco screw compressors installed by Tan Long, the system modulates to 30% - 45% capacity once setpoint is reached. A 50-ton shrimp storage facility averages 2,800 to 3,500 kWh/month, saving 25% - 30% compared to refurbished piston units.
Q: What is Tan Long’s warranty and emergency service policy across the Mekong Delta shrimp belt?
Tan Long provides a comprehensive 24-month warranty on compressor systems and a 5-year warranty on insulation panels. Across key aquaculture hubs including Ca Mau, Bac Lieu, Soc Trang, and Ben Tre, Tan Long maintains satellite engineering hubs operating 24/7/365, guaranteeing on-site emergency arrival within 45 to 90 minutes of an urgent dispatch.
