Bimetallic Floating Head Exchanger with 316L Tubes & SA350 Clad

Bimetallic Floating Head Exchanger with 316L Tubes & SA350 Clad

Engineered for differential corrosion service applications where tube-side and shell-side fluids present drastically different corrosivity requirements.

Need a custom quote for Floating Head Exchanger? Contact our engineering team directly: jimmy@steelseamlesspipe.com

Yuhong Holding Group: Fabricators of High-Value Process Equipment

Yuhong Holding Group Co., Ltd. delivers certified thermal and mechanical solutions. Our core competence lies in custom ASME pressure vessels, heat exchangers of all major designs, and air-cooled heat exchangers. We support these systems with a full line of engineered replacement cores, specialty tubing (U-bend, finned), and genuine OEM components.

Product Profile: The Economically Durable Floating Head Design

This floating head heat exchanger is specifically configured for processes with differential corrosion requirements. Its defining feature is the use of a bimetallic tubesheet, marrying the structural economy of SA350 LF2 forged carbon steel with the localized corrosion resistance of a bonded 316L stainless steel layer. Coupled with a full 316L stainless steel tube bundle, it targets longevity where it matters most.

Structural Breakdown & Specification

Assembly Section	Construction Detail	Performance Rationale
Primary Heat Transfer Surface	Full 316L Austenitic Stainless Steel Tube Bundle	Provides uniform corrosion resistance for the primary wetted surface against a wide range of process chemicals.
Critical Junction Interface	Explosion-Bonded or Roll-Clad Tubesheet (SA350 LF2 + 316L)	The clad design isolates the corrosive tube-side fluid from the carbon steel base, protecting vital tube-to-tubesheet joints at a fraction of solid alloy cost.
Pressure-Containing Shell	Typically ASME SA516 Carbon Steel	Utilizes lower-cost material suitable for the less aggressive shell-side service environment.
Thermal Expansion Management	Independent Floating Head with Bolted Cover	The floating head assembly mechanically decouples the bundle from the shell, preventing stress from differential thermal expansion.
Flow & Support Internals	Carbon Steel Baffles & Tie Rods	Optimizes thermal performance and mechanical stability using materials appropriate for the shell-side conditions.

Engineering Insight: The Economic Logic of Clad Construction

In process design, material cost often scales non-linearly with alloy performance. A solid 316L tubesheet for a large exchanger is prohibitively expensive. The clad solution applies a minimum thickness (typically 3-10mm) of the corrosion-resistant alloy only to the face and bore holes, where contact with the aggressive tube-side fluid occurs. The backing material (SA350 LF2) provides the necessary mechanical strength at a lower cost. This is not a compromise, but a smart, ASME-codified engineering practice for optimizing capital expenditure (CAPEX) without sacrificing critical service life.

Operational Benefits & Project Value

• CAPEX Optimization: Achieves the corrosion performance of high-grade alloys for the wetted surface while significantly reducing material costs compared to solid alloy construction.
• Lifecycle Integrity: The metallurgically bonded clad interface ensures long-term integrity, superior to weld overlays in withstanding thermal cycling and mechanical stress.
• Unmatched Serviceability: The floating head design permits complete bundle extraction, enabling inspection, cleaning, or repair of both the 316L tubes and the clad tubesheet face without cutting piping on the stationary end.
• Ideal Application Scope: Specifically engineered for offshore seawater cooling (tube-side) with sweet cooling media on shell-side, chemical processes with one highly corrosive stream, or any application with a pronounced corrosion asymmetry between sides.

Initiate a Design Consultation

To implement a cost-optimized exchanger solution for your asymmetric process conditions, engage with our engineering team. Submit your process flow diagram (PFD) or service details to jimmy@steelseamlesspipe.com for a feasibility analysis and a comparative cost proposal.

This bimetallic floating head exchanger uses 316L tubes with SA350 clad tubesheet construction, a combination that delivers stainless-level corrosion resistance on the process side while keeping the pressure boundary cost-effective. The floating head design accommodates thermal expansion and provides full access to the bundle, which matters in offshore and chemical service where maintenance windows are tight. SA350 LF2 base material with clad overlay gives the tubesheet strength and corrosion protection in one component. CE-certified fabrication, material documentation and hydrostatic testing are included, with engineering support for installation and startup.