1-805-484-2992
Quotes - Engineering - Sales| PRODUCT | STYLE | TEMA TYPE | BUNDLE |
| U-Tube Heat Exchanger | U-Tube, single tubesheet | BEU / AEU / BKU | Removable |
WFI and Pure Steam U-Tube Exchangers
Where the Condensate Is the Product
Water for injection and pure steam systems invert the usual hierarchy. In most exchangers the process fluid is valuable and the utility is not. Here the high-purity stream is the product, the utility is ordinary plant water or glycol, and the entire design question is how to guarantee the two never meet.
Double tubesheets are effectively standard. A vented interspace gives a tube joint leak somewhere visible to go instead of allowing plant water into injectable-grade water. Given the consequence, this is rarely argued about.
Thermal cycling is the fatigue driver. Hot WFI loops are held at elevated temperature and periodically sanitized higher still. The exchanger sees that cycle for its whole life. A U-tube bundle handles it without an expansion joint because each tube grows independently, which is a large part of why the geometry dominates this duty.
Material detail matters. 316L with controlled sulfur welds predictably and produces a surface that electropolishes well. Heat tint and weld ferrite are controlled because both create sites where the passive layer is weaker, and a hot high-purity loop is an efficient way to find them.
Typical Construction
- Typical duty: WFI cooling, pure steam generation and condensing
- Tubesheet: Double, vented interspace with telltale
- Wetted material: 316L, dual certified, controlled sulfur
- Surface finish: Electropolished, BPE SF designation
- Sanitization: Designed for repeated hot cycles
- Connections: Sanitary clamp or extended tube weld ends
- Drainability: Sloped, low-point drain, no dead legs
- Codes: ASME Section VIII Division 1 and ASME BPE
- Leak detection: Open telltale or instrumented interspace
- Documentation: Full BPE turnover package
WFI and Pure Steam U-Tube Exchangers
U-TUBE • CONSTRUCTION
ASME BPE U-Tube
ASME BPE U-tube heat exchangers: surface designations, weld examination, dead-leg ratios, drainability and the documentation package your qualificatio
+ Learn More
U-TUBE • CONSTRUCTION
Bioprocess U-Tube
Bioprocess U-tube heat exchangers for media preparation, fermenter temperature control, harvest cooling and buffer duty. Low holdup, gentle velocities
+ Learn More
U-TUBE • CONSTRUCTION
Sanitary U-Tube
Sanitary U-tube heat exchangers in 316L with tri-clamp connections, drainable geometry and removable bundles. Built for 3-A duty and CIP circuits.
+ Learn MoreWFI and Pure Steam U-Tube Exchangers
Design for the Sanitization Cycle, Not Just the Duty Point
A WFI cooler spends most of its life doing a modest thermal job and a small fraction of its life being sanitized. The sanitization condition frequently sets the design temperature, the gasket selection and the fatigue case even though it contributes nothing to the process duty.
Tell us the sanitization temperature, how long it is held and how often it runs. It changes the answer on gasket material, on whether clamp connections are appropriate, and on how the interspace of a double tubesheet is expected to behave.
Which Side Should the WFI Be On?
Running WFI through the tubes gives a smooth passage that drains under gravity in a vertical unit and is straightforward to sanitize. The limitation is the bend interior, which cannot be electropolished or verified.
Running WFI on the shell side makes every product-contact surface accessible for finishing and inspection, at the cost of engineering the shell for positive drainage. Where the specification demands an electropolished designation on all wetted surfaces, this is normally the resolution.
