The Double Tube Sheet Shell and Tube Heat Exchanger is a specialized heat transfer device designed based on the shell-and-tube structure, with a core double tube sheet design. It enables heat exchange between two independent fluid streams (e.g., product fluid and utility fluid) through the tube side (inside the heat exchange tubes) and shell side (outside the tubes), while the double tube sheets act as a physical barrier to isolate the two streams. This exchanger is engineered to eliminate cross-contamination risks and meet stringent hygiene standards, making it ideal for industries requiring ultra-high sanitation levels. It operates on the principle of countercurrent or concurrent heat transfer, ensuring efficient thermal exchange while maintaining absolute separation between media-critical for applications where product purity and regulatory compliance are non-negotiable.
Structural Features
Sanitary & Compact Construction
Constructed entirely of food-grade/pharmaceutical-grade stainless steel (e.g., 316L), all wetted and external surfaces undergo precision polishing (surface roughness Ra ≤ 0.8 μm for external parts). Its shell-and-tube structure is optimized for space efficiency, with a volume 30%–50% smaller than traditional single-tube-sheet heat exchangers of the same heat transfer capacity, saving installation space in cleanrooms or compact production lines.
Dual Tube Sheet Barrier
The unique double tube sheet design creates an interstitial space between the primary and secondary tube sheets. This structure physically separates the product and utility fluids, preventing cross-contamination even if a tube leaks. The interstitial space also allows for real-time leak detection (via pressure monitoring or visual inspection), ensuring immediate response to potential risks.
Full-Drainage Pipeline Design
The entire pipeline system is designed with optimized slopes and smooth internal surfaces, enabling 100% gravity-driven emptying of residual fluids. This eliminates dead zones and residue buildup, avoiding microbial growth and simplifying Clean-in-Place (CIP) and Sterilize-in-Place (SIP) procedures.
Comprehensive Tube Specifications
Available with heat exchange tubes in diameters of Ф6 mm, Ф8 mm, Ф10 mm, and Ф12 mm, it can be customized to match diverse process requirements-from small-scale lab R&D (e.g., drug formulation cooling) to large-batch industrial production (e.g., bulk vaccine temperature control).
Technical Advantages
Hydraulic Expansion Tube Technology
Heat exchange tubes are bonded to the double tube sheets using high-pressure hydraulic expansion (up to 6,000 bar). This weld-free connection avoids heat-induced material degradation, ensures uniform stress distribution, and maintains the integrity of the tube surface. It eliminates micro-cracks and leakage points, enhancing corrosion resistance and extending equipment service life by 50% compared to welded connections.
Reliable Sealing with Double Slot Expansion Joints
Equipped with double slot expansion joints made of FDA-compliant materials (e.g., PTFE, EPDM), the exchanger maintains leak-tight performance under thermal cycling (temperature range: -10°C to 200°C) and exposure to aggressive sanitizing agents (e.g., peracetic acid, sodium hydroxide). The joints compensate for thermal expansion/contraction, reducing mechanical stress on the structure and lowering maintenance downtime by 40%.
Ultra-Smooth BA Tube Performance
The heat exchange tubes adopt Bright Annealed (BA) processing, with an internal surface roughness of <0.5 μm. This mirror-like finish minimizes fluid adhesion and microbial attachment, reducing residue accumulation by over 70% and simplifying cleaning validation. The BA tubes also exhibit excellent resistance to acidic/alkaline media, preventing metal ion leaching and meeting USP <1058> and EU GMP Annex 1 standards.
Strict Regulatory Compliance
The exchanger fully complies with global sanitary and safety standards, including GMP (Good Manufacturing Practice), FDA (U.S. Food and Drug Administration), 3-A Sanitary Standards, and ASME BPVC Section VIII. It provides complete traceability documentation (e.g., material certificates, pressure test reports) to support regulatory inspections and batch record requirements.
Low Maintenance & Cost Efficiency
The durable structure and wear-resistant components reduce maintenance frequency and replacement costs. The compact design lowers infrastructure investment, while the high heat transfer efficiency (heat transfer coefficient up to 3,500 W/(m²·°C) for water-water systems) reduces energy consumption by 15%–20% compared to conventional heat exchangers.
Application
With its superior hygiene performance and reliable heat transfer capabilities, the Double Tube Sheet Shell and Tube Heat Exchanger is widely used in industries with strict sanitation and purity requirements:
Pharmaceutical Industry
Applied in Water for Injection (WFI) heating/cooling, API (Active Pharmaceutical Ingredient) temperature control, vaccine and biologic (e.g., monoclonal antibody) sterilization, and sterile buffer preparation. It prevents cross-contamination and ensures compliance with drug quality standards.
Food & Beverage Industry
Used for pasteurization of dairy products (e.g., milk, yogurt), sterilization of fruit juices, and temperature control of edible oils. The full-drainage design and easy cleaning features avoid flavor cross-contamination and meet food safety standards (e.g., FDA 21 CFR Part 177).
Biotechnology Industry
Suitable for fermentation broth cooling, cell culture medium heating, and purification process thermal exchange. The ultra-smooth BA tubes and leak-proof structure maintain sterile conditions, protecting the activity of sensitive biological materials.
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