Pass Partitions: Temperature Range -50°C to 400°C

Q: What is the primary function of pass partitions in heat exchangers?

Pass partitions create multiple tube-side fluid passes to increase velocity and improve heat transfer efficiency by optimizing flow path length and temperature differentials.

Q: How do pass partitions affect maintenance accessibility?

Properly designed partitions allow for tube bundle removal and cleaning while maintaining structural integrity; removable partitions are available for high-fouling applications.

Q: What materials are suitable for corrosive service conditions?

Duplex stainless steels, nickel alloys, and titanium offer excellent corrosion resistance in chloride, acidic, or high-temperature environments per ASTM and NACE standards.

Component Specifications

Definition

Pass partitions are structural components installed within tube sheets or headers of shell-and-tube heat exchangers to create multiple fluid passes. They direct the tube-side fluid through specific tube bundle sections in a predetermined sequence, controlling flow path length and velocity to achieve desired heat transfer coefficients and temperature profiles. These partitions are precision-engineered to withstand thermal expansion, pressure differentials, and corrosive environments while maintaining leak-tight seals between adjacent passes.

Working Principle

Pass partitions function by physically dividing the tube-side header into compartments, forcing the working fluid to traverse the tube bundle multiple times before exiting. This multi-pass arrangement increases fluid velocity and residence time, enhancing convective heat transfer coefficients. The partitions create serial flow paths that optimize logarithmic mean temperature difference (LMTD) and prevent fluid bypassing, ensuring uniform thermal loading across the heat exchanger surface.

Materials

Carbon steel (ASTM A516 Gr.70), stainless steel (316L, 304L), duplex stainless steel (2205), nickel alloys (Inconel 625, Monel 400), titanium (Grade 2), copper-nickel (90/10, 70/30) with corrosion allowances per NACE MR0175 for sour service.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	12-50 mm
Leakage Rate	<0.01% of flow rate per TEMA RCB-4.151
Surface Finish	Ra 3.2 μm max
Pressure Rating	Up to 3000 psi (207 bar)
Temperature Range	-50°C to 400°C
Flatness Tolerance	±0.5 mm/m

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 16812, DIN 28184, ASME BPVC Section VIII, TEMA Class R

Parent Products

This component is used in the following industrial products

Tube Sheets / Headers

Structural components that secure and distribute fluid flow in heat exchanger tube bundles.

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Engineering Analysis

Risks & Mitigation

Thermal stress cracking due to differential expansion
Corrosion at partition-to-tube sheet welds
Flow-induced vibration damage
Gasket failure causing cross-pass contamination
Erosion at high-velocity turnarounds

FMEA Triads

Trigger: Inadequate thermal expansion accommodation
Failure: Partition buckling or weld cracking
Mitigation: Implement expansion joints, use flexible designs, and calculate thermal stresses per ASME Section VIII Div.2

Trigger: Crevice corrosion in stagnant zones
Failure: Leakage between passes
Mitigation: Specify corrosion-resistant alloys, ensure complete drainage, and apply protective coatings per NACE SP0169

Trigger: High-velocity fluid impingement
Failure: Erosion at partition edges
Mitigation: Install wear plates, radius all edges, and maintain velocities below 3 m/s for liquids, 30 m/s for vapors

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerances per ASME Y14.5, flatness within 0.8 mm over entire surface, perpendicularity within 0.5° to tube sheet face

Test Method

Hydrostatic testing at 1.5x design pressure per ASME BPVC Section VIII, dye penetrant examination of all welds, ultrasonic thickness verification

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Pass Partitions

Manufacturer profiles associated with Pass Partitions.

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Frequently Asked Questions

What is the primary function of pass partitions in heat exchangers?