Yuhong Group Co., Ltd. designs and manufactures a comprehensive range of heat transfer equipment—shell and tube heat exchangers, pressure vessels, air coolers, and fired heaters—alongside critical components including tube bundles, U-tubes, heat exchanger tubes, finned tubes, tubesheets, baffles, and channel heads. With three ASME-certified facilities spanning 184,000 m² and an annual capacity exceeding 3,600 units, we deliver code-compliant thermal equipment to global oil & gas, petrochemical, and power generation markets.
The ASME U Stamp Water to Water Shell and Tube Heat Exchanger is a pressure vessel engineered for liquid-to-liquid heat transfer service in demanding oil & gas environments. Designed and fabricated in full compliance with ASME Boiler and Pressure Vessel Code Section VIII Division 1, this exchanger carries the ASME "U" Stamp—certifying that the vessel has undergone independent design verification, material traceability, weld procedure qualification (ASME Section IX), and third-party inspection by an Authorized Inspector.
Available in fixed tubesheet (TEMA AEL/BEM) or U-tube (TEMA BEU) configurations, the unit accommodates thermal expansion differentials while maintaining leak-proof tube-to-tubesheet joints (expanded or seal-welded). Shell diameters range from 6" to 120" (customizable), with tube lengths up to 20 m and pressure ratings up to 6,000 psi. Operating temperature range: -50°C to 600°C.
All pressure-retaining components are fabricated from ASME-certified materials with full mill test reports (MTRs) and positive material identification (PMI):
| Component | Material Standard | Typical Grade(s) |
|---|---|---|
| Shell & Channel | ASME SA516 | Gr.70 / Gr.70N (carbon steel, pressure vessel quality) |
| Tubesheet | ASME SA266 / SA182 | Gr.2 / Gr.2N (forged carbon steel); F304L / F316L (stainless) |
| Heat Exchanger Tubes | ASME SA179 / SA213 | SA179 (low-carbon steel); TP304L / TP316L (stainless) |
| Baffles / Support Plates | ASME SA516 | Gr.70 (carbon steel) |
| Flanges & Nozzles | ASME SA105 / SA182 | SA105 (carbon steel); F304L / F316L (stainless) |
| Bolting | ASTM A193 / A194 | Gr.B7 studs with Gr.2H heavy hex nuts |
Tube-to-tubesheet joints are executed via hydraulic expansion or seal welding per ASME Section VIII UW-20, with expanded joint depth and pull-out strength verified through qualification testing.
Every U-stamped unit undergoes the following inspection and testing protocol, witnessed by an Authorized Inspector (AI):
| Test / Inspection | Method / Standard | Acceptance Criteria |
|---|---|---|
| Non-Destructive Examination (NDE) | Radiographic Testing (RT) - ASME Section V | Full circumferential butt welds; no unacceptable indications per ASME VIII UW-51 |
| Ultrasonic Testing (UT) - ASME Section V | Plate and forging lamination inspection | |
| Dye Penetrant (PT) / Magnetic Particle (MT) | Surface flaw detection on nozzle-to-shell welds | |
| Hydrostatic Test | Per ASME UG-99 | Test pressure ≥ 1.3 × MAWP (shell side and tube side); minimum 30-minute hold; no visible leakage or pressure drop |
| Pneumatic Test | Per ASME UG-100 (when hydrotest not feasible) | Test pressure per code; leakage rate ≤ code allowance |
| Post-Weld Heat Treatment (PWHT) | As required by ASME UCS-56 | Controlled heating/cooling cycle per material thickness and group |
| Final Visual Inspection | ASME Section VIII Appendix 8 | Dimensional verification, surface finish, nameplate attachment |
All NDT reports, hydrostatic test charts, welding procedure specifications (WPS/PQR), and material test reports are compiled into a comprehensive data report (Form U-1 or U-1A) and registered with the National Board (NB) where required.
This water-to-water shell and tube heat exchanger is deployed across upstream, midstream, and downstream oil & gas operations:
The exchanger handles clean to moderately fouling water services on both shell and tube sides, with fouling factors accounted for in thermal design per TEMA standards.
Thermal Design: Heat transfer area and tube count are calculated per TEMA standards using HTRI or equivalent thermal design software, with baffle spacing and cut (typically 25% segmental) optimized for cross-flow velocity and heat transfer coefficient.
Mechanical Integrity: Fixed tubesheet design (TEMA AEL/BEM) provides the simplest, most leak-proof construction for low thermal expansion differential service. U-tube design (TEMA BEU) accommodates high ΔT without expansion joints, eliminating one tubesheet and reducing cost.
Corrosion Allowance: Shell, channel, and tubesheet thicknesses include specified corrosion allowance (typically 1.5-3.0 mm) per client process requirements, ensuring service life under corrosive water chemistries.
For technical specifications, custom design inquiries, or to request a quotation, please contact:
