Ecer asks for your consent to use your personal data to:
Personalised advertising and content, advertising and content measurement, audience research and services development
Store and/or access information on a device
Your personal data will be processed and information from your device (cookies, unique identifiers, and other device data) may be stored by, accessed by and shared with 135 TCF vendor(s) and 65 ad partner(s), or used specifically by this site or app.
Some vendors may process your personal data on the basis of legitimate interest, which you can object to by do not consent. Contact our platform customer service, you can also withdraw your consent.
Your message must
be between 20-3,000 characters!
Submit Requirement
Thank You！
Your requirement has been sent. we will contact you quickly!
{"title":"ASME U Stamp Floating Head Heat Exchanger with TEMA Class R Design for High","imgUrl":"https:\/\/img.chinax.com\/nimg\/ca\/51\/be9dc43befb4feeb8d26a55e9422-200x200-1\/asme_u_stamp_floating_head_heat_exchanger_with_tema_class_r_design_for_high.jpg","attrs":{"Minimum Order Quantity":"1 Set","Delivery Time":"45 - 150 Days","Model Number":"Floating Head Heat Exchanger, Shell and Tube Heat Exchanger","Design pressure":"0.1 - 30 MPa"}}
{"title":"API 660 Shell And Tube Heat Exchanger TEMA Standard ASME U Stamp ASME VIII","imgUrl":"https:\/\/img.chinax.com\/nimg\/d4\/bb\/6c889e0e1115ea61355fe43f4169-200x200-1\/api_660_shell_and_tube_heat_exchanger_tema_standard_asme_u_stamp_asme_viii.jpg","attrs":{"Brand Name":"YUHONG","Model Number":"Shell and Tube Heat Exchanger","Certification":"API 660, TEMA, ASME VIII, ASME , U STAMP , PED, API , ABS, LR, DNV, GL , BV, KR, TS, CCS","Place of Origin":"China"}}
{"title":"Shell And Tube Heat Exchanger API 660 ASME U Stamp For Petrochemical Industry","imgUrl":"https:\/\/img.chinax.com\/nimg\/25\/5b\/c69a652753f845a81519b48f12c4-200x200-1\/shell_and_tube_heat_exchanger_api_660_asme_u_stamp_for_petrochemical_industry_application.jpg","attrs":{"Brand Name":"YUHONG","Model Number":"Heat Exchanger Baffle, Impingement plate,Transverse baffle,Partition pass plate (Partition plate )","Certification":"ASME , U STAMP , PED, API , ABS, LR, DNV, GL , BV, KR, TS, CCS","Place of Origin":"China"}}
{"title":"Shell and Tube Heat Exchanger | ASME Certified | Stainless Steel","imgUrl":"https:\/\/img.chinax.com\/nimg\/82\/95\/b75f3804840780c34c0df7417611-200x200-1\/shell_and_tube_heat_exchanger_7c_asme_certified_7c_stainless_steel.jpg","attrs":{"Brand Name":"YUHONG","Model Number":"YH-HX-STHE","Certification":"ASME,ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015","Place of Origin":"China"}}
{"title":"ASME U Stamp Heat Exchanger API 660 In Petrochemical And Oil Refinery","imgUrl":"https:\/\/img.chinax.com\/nimg\/ee\/1d\/84c6e3f2babdeaff4fb3d23a758a-200x200-1\/asme_u_stamp_heat_exchanger_api_660_in_petrochemical_and_oil_refinery.jpg","attrs":{"Brand Name":"Yuhong","Model Number":"API 660, API 661, API 663","Certification":"ASME U , ISO 9001, ISO 14001, ISO 18001, ABS, BV, DNV-GL, LR, KR, CCS, NK , TUV","Place of Origin":"CHINA"}}
{"title":"Shell and Tube Heat Exchanger API Standard 660, ASME VIII Division 1, TEMA R","imgUrl":"https:\/\/img.chinax.com\/nimg\/69\/fb\/69839176851176bf75cd36d5d991-200x200-1\/shell_and_tube_heat_exchanger_api_standard_660_2c_asme_viii_division_1_2c_tema_r_class.jpg","attrs":{"Brand Name":"YUHONG","Model Number":"Shell & Tube Heat Exchanger with Clad Construction","Certification":"ASME Sec VIII Div.1 + TEMA Class R","Place of Origin":"CN"}}
{"title":"\u200b\u200bTEMA Class R BEM Heat Exchanger, Fixed Tubesheet, NACE SA179 tube for Sour Gas","imgUrl":"https:\/\/img.chinax.com\/nimg\/7d\/e6\/f878a90a293d6d7760005b443ec1-200x200-1\/e2_80_8b_e2_80_8btema_class_r_bem_heat_exchanger_2c_fixed_tubesheet_2c_nace_sa179_tube_for_sour_gas_refinery_service.jpg","attrs":{"Brand Name":"YUHONG","Model Number":"Fixed Tube Sheet Heat Exchanger, \u200b\u200bTEMA Class R BEM","Certification":"ASME U Stamp, PED 2014\/68\/EU, ISO 9001\/14001","Place of Origin":"CN"}}
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
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):
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.
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
