Sanitary DTS (Double Tube Sheet) Heat Exchanger

I. Design Advantages
· U-tube Design: Features a U-tube design, specifically recommended by ASME, with a unique structure that ensures reliable performance.
· Professional Design Support: Leveraging years of heat exchanger manufacturing experience, along with specialized selection software and databases, to ensure precise product selection.
· Expansion Joint-Free Design: An innovative expansion joint-free design reduces the risk of malfunctions and lowers maintenance costs.
II. Performance Guarantees
·High Efficiency and Energy Savings: Optimal design of internal flow velocity strictly controls pressure drop within customer-specified limits, maximizing heat transfer efficiency. Additionally, reasonable design margins are incorporated to enhance processing capacity to a certain extent, meeting the needs of business growth.
·Durability and Safety: The use of forged, thickened, aseptic double-plate tube design significantly enhances safety performance and fatigue strength, ensuring long-term stable operation.
III. Scientific Analysis
・Compliance with Industry Standards: Following TEMA recommendations, fouling factors are applied to every design to ensure the long-term stable operation of the equipment.
·Comprehensive and Precise Analysis: Each design report includes precise pressure points for both tube and shell walls (based on your approved pressure points) and undergoes 100% vibration and resonance analysis. For all multi-pass heat exchangers (straight tubes or U-tubes), precise counter-current and cross-flow analyses are conducted to comprehensively optimize heat transfer efficiency.
・Transparent Calculations: Heat transfer area is calculated only for the straight tube sections; U-bends are excluded from the heat transfer calculations. The calculation method is clear and transparent, providing you with an immediate understanding.

· Double-tube-sheet design prevents cross-contamination.
· Side-drain design for complete product drainage.
· Designed in accordance with FDA and CGMP requirements, offering flexible design options.
· The product flows through the inner tube bundle on the product side, while the cooling medium flows in the opposite direction through the outer tube bundle. The ends of the heat exchange tube bundle are secured by double-tube-sheets, which also serve as leak detection points to prevent bidirectional cross-contamination between the product and the cooling medium.
· The unit can be installed vertically or horizontally, primarily based on the customer’s space requirements. To facilitate installation, lifting and mounting brackets are pre-welded to the heat exchanger at the factory.
· Designed as a water intake cooler for injection water and pure water systems.
· Heat exchange tubes are made of imported SUS316L stainless steel; the outer diameter of the tubes is designed and manufactured according to user specifications.
· Please contact our company for specific engineering parameters; we can customize designs based on user requirements.

Technical Specifications
I. Process Features
We utilize an advanced hydraulic expansion process to join the tubes and baffles. This method significantly reduces surface damage caused by roller expansion, such as during the quenching process and when the tubes are thinned by expansion. In addition, all of our monolithic bidirectional thin-wall tubes effectively reduce stress at the tube-to-baffle interface, ensuring consistency,
minimizing maintenance time, and extending the service life of the equipment.
II. Pre-shipment Inspection Process
Every heat exchanger undergoes rigorous testing prior to shipment:
· Performance Testing: Hydrostatic testing (to verify equipment stability under fluid pressure), fuel permeation testing with X-ray analysis (to check for fuel leaks and internal structural issues), and computer-verified performance.
· Surface Inspection: Using a surface profilometer to ensure the surface roughness (Ra value) of polished and electropolished surfaces is below 0.25 μm.
· Comprehensive Inspection: Visual and endoscopic inspection, coding, and compliance checks in accordance with TEMA standards.
III. Compliance Standards
· ASME BPE-2005 (American Society of Mechanical Engineers Bioprocess Equipment Standard)
· ASME UM, NBR&R (Relevant Industry Standards)
· Canadian Registration (CRN)
· CE/PED (EU CE Certification and Pressure Equipment Directive)

Equipment Testing, Inspection, and Cleaning
I. Test Items
· Pressure Retention Test: Tests the equipment’s pressure retention performance.
· Drainability Test: Checks whether the equipment can completely drain the internal medium.
· Surface Roughness Test: Measures the surface roughness of the equipment to ensure that the Ra value for mechanically and electrochemically polished surfaces is below 0.25 μm.
· Endoscopic Inspection: Inspect the internal condition of the equipment using an endoscope.
· Pre-Packing Internal Blowout Inspection: Perform an internal blowout inspection prior to packing to ensure the interior is free of debris.
· Computer Functionality Verification: Verify the relevant functions of the computer system.
II. Validation and Standards
· Validation Document Completeness Check: Verify that all relevant documentation is complete.
· Surface Photometer Testing: Measure surface reflectance using a photometer.
· Light and Endoscope Inspection Standards: Comply with TEMA standards.
Other Standards:
Including ASME BEP 2005, ASME U, U, NBR & R; Canadian Registration (CRN), CE/PED.

I. Customization and Strength
· Customization is available. Seamless joints are created using imported equipment, ensuring high strength and a long service life.
II. Pipe Precision
· Bend radii comply with ASME requirements, and pipe contact within U-bends is excellent. (ASME: American Society of Mechanical Engineers)
· Inner surface roughness ranges from 0.3 μm to 0.6 μm (for seamless electrode tubes); for sanitary-grade welded tubes, roughness does not exceed 0.75 μm.
III. Design Standards
· U-tube design fully complies with the ASME BPE 200S standard and adheres to strict QA/QC procedures.
IV. Heat Transfer Design
· Heat transfer area is calculated based solely on the straight pipe sections; U-bends are not included.
V. Structural Advantages
・Forged, thickened, aseptic double-plate design ensures safety and fatigue resistance.
・Expansion joint-free design.