Name: ASME U Stamp Floating Head Heat Exchanger with TEMA Class R Design for High-Temperature Differential
Brand: Yuhong Group Co.,Ltd
SKU: Scambiatore di calore a testa flottante, scambiatore di calore a fascio tubiero
Price: 500,000.00 USD
Availability: InStock

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ASME U Stamp Floating Head Heat Exchanger with TEMA Class R Design for High-Temperature Differential

Dettagli:

Luogo di origine:	Cina
Marca:	YUHONG
Certificazione:	ASME, U STAMP, TEMA
Numero di modello:	Scambiatore di calore a testa flottante, scambiatore di calore a fascio tubiero

Termini di pagamento e spedizione:

Quantità di ordine minimo:	1 set
Prezzo:	1 - 1000000 USD
Imballaggi particolari:	Pallet/cassa in legno
Tempi di consegna:	45 - 150 giorni
Termini di pagamento:	T/T, L/C
Capacità di alimentazione:	100 set al mese

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Descrizione di prodotto dettagliata

Area di scambio termico:	Da 5 mq a 3.000 mq	Pressione di progetto:	0,1 - 30 MPa
Diametro del tubo:	Da Φ19×2 mm a Φ25×2,5 mm	Temperatura di progetto:	-100°C a 550°C

ASME U Stamp Floating Head Heat Exchanger with TEMA Class R Design for High-Temperature Differential

TEMA Class R Shell & Tube Design for High-Temperature Differential and Fouling Services

Product Overview

Yuhong Group Co., Ltd. engineers and fabricates ASME-certified shell-and-tube heat exchangers, pressure vessels, and air-cooled heat exchangers for the global oil & gas, petrochemical, refining, and power generation sectors.

The ASME U Stamp Floating Head Heat Exchanger is a TEMA Class R shell-and-tube unit specifically selected for severe thermal differentials and shell-side fouling. The floating tubesheet is not welded to the shell, enabling the tube bundle to expand and contract independently—eliminating differential thermal expansion stress when the temperature difference (ΔT) between shell-side and tube-side fluids exceeds 60°C.

The removable bundle design allows full pull-through extraction for mechanical cleaning, tube inspection, and plugging without disturbing shell-side piping, drastically reducing turnaround time.

Major Components - Material Standards & Specifications

Component	Material Standard / Typical Grade	Functional Role
Heat Exchanger Tubes (seamless)	ASME SA-213 TP316L	Low-carbon stainless steel; superior resistance to chloride pitting and general corrosion
Stationary Tubesheet	ASME SA-182 F316L (forged)	Fixed-end connection to shell; houses tube inlets/outlets
Floating Tubesheet	ASME SA-266 Gr.2 (carbon steel forging)	Not welded to shell; permits axial thermal movement
Shell & Shell Cover	ASME SA-516 Gr.70 (carbon steel plate)	Primary pressure boundary; thickness designed per ASME UG-27
Channel & Channel Cover	ASME SA-516 Gr.70 or ASME SA-240 316L (plate)	Tube-side fluid containment; provides access to tube ends
Baffles	ASME SA-516 Gr.70 or ASME SA-240 316L	Support tubes and direct cross-flow for enhanced heat transfer
Floating Head Assembly	Cover, gasket, bolting - per ASME Section VIII	Enables bundle extraction and accommodates differential expansion

Tubesheet cladding can be specified with ASME SA-266 Gr.2 + 304, + 316L, + 2205, or + 8825 for aggressive corrosive/erosive services. Tube diameters range from Φ19×2 mm to Φ25×2.5 mm (custom gauges available), and heat transfer areas are engineered from 5 m² up to 3,000 m² depending on thermal duty and allowable pressure drop.

Testing & Inspection Requirements (ASME Section VIII Div. 1)

Test Type	Code Reference	Acceptance Criterion
Hydrostatic Test	UG-99 - 1.3 × MAWP, minimum 30‑min hold	No visible leakage or pressure decay; tested separately on shell and tube sides
Radiographic Examination (RT)	ASME Section V, Article 2	Full or spot RT per UW-11; no unacceptable volumetric indications
Ultrasonic Examination (UT)	ASME Section V, Article 5	Laminar inspection of plates and forgings; thickness verification
Dye Penetrant / Magnetic Particle (PT/MT)	ASME Section V, Articles 6 & 7	Surface flaw detection on all pressure-retaining welds and machined surfaces
Pneumatic Test	Optional (when hydrotest not feasible)	Per ASME Code Case or user specification
Final Dimensional Check	Per approved fabrication drawings	All critical dimensions (tube pitch, baffle spacing, nozzle orientation) verified

All inspections are documented in the Manufacturer's Data Report (MDR) and witnessed by the ASME Authorized Inspector prior to U Stamp application.

Application Scenarios

Floating head exchangers are mandated where fixed tubesheet or U-tube designs are inadequate:

Oil & Gas: Crude preheat trains, gas dehydration, refinery crude distillation unit (CDU) overheads
Petrochemicals: Reactor effluent cooling, solvent regeneration, ethylene quench coolers
Power Generation: Steam surface condensers, feedwater heaters, turbine lube oil coolers
Heavy Industry: Blast furnace gas cooling, compressor intercoolers, hydraulic oil cooling
Severe Fouling Services: Fluids with high scaling, coking, or polymerization tendency that demand regular mechanical cleaning

Technical Advantages & Customization

Stress-Free Thermal Expansion - The floating tubesheet is unrestrained, allowing the bundle to slide axially. This eliminates thermal fatigue cracks common in fixed designs when ΔT exceeds 60°C - a parameter validated by FEA per ASME Section VIII, Appendix 4.

Full Maintainability - After removing the rear cover and floating head, the entire bundle can be pulled out. External tube surfaces and shell interior are fully accessible for high‑pressure water jetting or brushing, which is impossible with U‑tube bundles (due to bend radius constraints).

Corrosion Resistance - SA‑213 TP316L tubes offer proven resistance to chlorides (up to 2,000 ppm) and a wide pH range, with low carbon content (≤0.035%) preventing intergranular corrosion after welding.

Customisable Parameters (all within ASME design limits):

Design pressure: 0.1 - 30 MPa (g)
Design temperature: -100°C to +550°C
Shell materials: carbon steel (SA‑516), alloy steel, stainless steel (304/316L), duplex (2205)
Tube materials: stainless steel, carbon steel (SA‑179), titanium, copper‑nickel (C70600), nickel alloys (Incoloy 825)
TEMA types: AES, AET, or other floating head variants
Baffle arrangements: single‑segmental, double‑segmental, or helical to optimise cross‑flow velocity

Frequently Asked Questions

Q: When is a floating head exchanger preferred over fixed tubesheet or U‑tube?
A: Specify floating head when the shell‑side ΔT exceeds approximately 60°C AND shell‑side fouling is expected. Fixed tubesheet cannot accommodate large expansion; U‑tube bundles cannot be mechanically cleaned on the outside of the bends.

Q: What distinguishes TEMA AES from AET floating head designs?
A: AES uses a split‑backing ring for gasket retention; AET employs a pull‑through floating head. AES is more common for moderate pressures; AET is selected when the floating head cover must be fully removable without disturbing the shell.

Q: What does the ASME U Stamp legally certify?
A: It certifies that the vessel's design, materials, fabrication, welding, NDE, and hydrotest fully comply with ASME Section VIII Div. 1. The stamp, applied by an Authorized Inspector, is a prerequisite for procurement in most jurisdictions and for insurance underwriting.

Q: Can the tube bundle be withdrawn without disconnecting shell‑side piping?
A: Yes - after removing the rear channel cover and floating head cover, the bundle slides out axially, leaving all shell‑side nozzles and piping intact.

Q: Which NDE methods are mandatory for ASME U Stamp floating head exchangers?
A: ASME Section VIII mandates RT of all butt welds (per UW‑11), UT of plates and forgings (per UG‑93), and PT/MT of surface welds. Additional NDE (e.g., PMI, hardness testing) can be added per user specification.

For detailed technical data sheets, 3D models, or a quotation tailored to your process conditions, please contact Yuhong Group Co., Ltd. directly at vladimir@steelseamlesspipe.com.