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YUHONG HOLDING GROUP CO., LTD

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China Custom Carbon Steel ASME U Stamp Certified U-tube Bundle for Heat Exchangers
China Custom Carbon Steel ASME U Stamp Certified U-tube Bundle for Heat Exchangers

  1. China Custom Carbon Steel ASME U Stamp Certified U-tube Bundle for Heat Exchangers
  2. China Custom Carbon Steel ASME U Stamp Certified U-tube Bundle for Heat Exchangers
  3. China Custom Carbon Steel ASME U Stamp Certified U-tube Bundle for Heat Exchangers
  4. China Custom Carbon Steel ASME U Stamp Certified U-tube Bundle for Heat Exchangers

Custom Carbon Steel ASME U Stamp Certified U-tube Bundle for Heat Exchangers

  1. MOQ： 1 Set
  2. Price： 1 - 1000000 USD
  3. Get Latest Price
Design temperature Up to 450°C (tube side)
Delivery Time 45 - 150 Days
Tube length Up to 20 m
Payment Terms T/T,L/C
Minimum bend radius 2× tube outside diameter (R ≥ 2× OD)
Tube diameter 3.2 mm to 76.2 mm (⅛" to 3")
Supply Ability 100 Sets per month
Design pressure Up to 206.8 bar (3,000 psi)
Bundle diameter Custom, typically 500 mm to 3,000 mm
Packaging Details Pallet/ Ply-Wooden Cases with Steel Frames
Model Number U Tube Bundle, Shell & Tube Heat Exchanger Tube Bundle
Certification ASME, U STAMP, TEMA, API 661, EAC, GOST, TUV, ISO
Brand Name YUHONG
Place of Origin China

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  1. Product Details
  2. Company Details

Product Specification

Design temperature Up to 450°C (tube side) Delivery Time 45 - 150 Days
Tube length Up to 20 m Payment Terms T/T,L/C
Minimum bend radius 2× tube outside diameter (R ≥ 2× OD) Tube diameter 3.2 mm to 76.2 mm (⅛" to 3")
Supply Ability 100 Sets per month Design pressure Up to 206.8 bar (3,000 psi)
Bundle diameter Custom, typically 500 mm to 3,000 mm Packaging Details Pallet/ Ply-Wooden Cases with Steel Frames
Model Number U Tube Bundle, Shell & Tube Heat Exchanger Tube Bundle Certification ASME, U STAMP, TEMA, API 661, EAC, GOST, TUV, ISO
Brand Name YUHONG Place of Origin China
High Light Custom Carbon Steel U-tube Bundle ，ASME U Stamp Certified Tube Bundle ，Heat Exchanger U-tube Bundle 450°C
Custom Carbon Steel Heat Exchanger U Tube Bundle for Oil Refinery | ASME U Stamp Manufacturer
Yuhong Group Co., Ltd. specializes in the design and fabrication of custom heat exchange equipment, pressure vessels, and air-cooled heat exchangers. Our product portfolio includes complete shell-and-tube heat exchangers, replacement tube bundles, U-bend tubes, finned tubes, and core components such as tube sheets, baffles, channel covers, and flanges. This description covers our custom carbon steel U-tube bundle assemblies — engineered for oil refinery services and manufactured under ASME U Stamp certification.

Product Overview
The U-tube bundle is the primary heat transfer component in shell-and-tube heat exchangers. Unlike fixed tubesheet designs, the U-tube configuration features tubes bent into a U-shape with both ends secured into a single tubesheet. This allows each tube to expand and contract independently under thermal cycling, eliminating the need for expansion joints or floating head mechanisms.
Our custom carbon steel U-tube bundles are designed, fabricated, and inspected in accordance with ASME Boiler and Pressure Vessel Code Section VIII, Division 1, and bear the ASME U Stamp — certifying compliance under authorized inspector supervision. Additional design and fabrication criteria follow TEMA Standards (Tubular Exchanger Manufacturers Association) where applicable.
Key Design Parameters
  • Design pressure: Up to 206.8 bar (3,000 psi)
  • Design temperature: Up to 450°C (tube side)
  • Tube diameter: 3.2 mm to 76.2 mm (⅛" to 3")
  • Bundle diameter: Custom, typically 500 mm to 3,000 mm
  • Tube length: Up to 20 m

Main Components and Material Specifications
Component Material Standard Grade / Specification Key Properties Typical Dimensions
U-Bend Tubes ASME SA179 / ASTM A179 Cold-drawn seamless low-carbon steel Tensile ≥325 MPa; Yield ≥180 MPa; Elongation ≥35%; Hardness ≤72 HRB OD: 3.2 - 76.2 mm; WT: 0.71 - 3.40 mm
Tubesheet ASME SA516 Gr.70N Normalized carbon steel plate Tensile 485-620 MPa; Yield ≥260 MPa Thickness: Custom, typically 40-150 mm
Baffle Plates ASME SA36 / SA516 Carbon steel structural plate High-strength structural carbon steel Custom-cut to bundle diameter
Tie Rods & Spacers ASME SA36 / SA193 Carbon / alloy steel Per design requirements Custom lengths
Channel / Cover ASME SA516 Gr.70 Carbon steel plate Per ASME VIII Div.1 Custom dimensions
Note: Material grades may be varied per client specification and process conditions. Alternative tubesheet materials include ASME SA266 Gr.2N, SA336 F5/F11/F22, and SA350 LF2 CL1 for low-temperature service.

Inspection and Testing Requirements
All tube bundles undergo mandatory inspection and testing in accordance with ASME Section VIII Division 1 and the documented Quality Control System:
Test / Inspection Standard / Method Purpose
Raw Material Inspection ASME SA-20 / MTR verification Verify chemical composition and mechanical properties
Tube Flattening Test ASME SA179 / ASTM A179 Verify ductility and soundness of seamless tubes
Tube Expansion Test ASME SA179 Verify tube-to-tubesheet joint integrity
Non-Destructive Examination (NDE) Ultrasonic Testing (UT), Penetrant Testing (PT) Detect surface and subsurface defects in tubesheet forgings and welds
Hydrostatic Test ASME Section VIII UG-99 (1.3* MAWP minimum) Verify pressure integrity of tube-to-tubesheet joints and tube wall strength
Dimensional Inspection Per fabrication drawing and TEMA tolerances Verify tube layout, baffle spacing, and overall bundle geometry
Welding Procedure & Performance Qualification ASME Section IX Qualify all welding procedures (PQR) and welders (WQR)
Final Documentation ASME Form U-1 / U-2 Data Report Certified record for National Board registration
Note: All testing is witnessed by the ASME Authorized Inspector and available for third-party inspection upon request.

Application Scenarios in Oil Refineries
Custom carbon steel U-tube bundles are specified for a wide range of refinery process units where thermal differentials are significant and tube-side fouling requires periodic bundle removal for cleaning:
  • Crude Oil Preheaters — Preheat crude oil before atmospheric distillation using recovered heat from product streams
  • Refinery Condensers — Condense overhead vapors from distillation columns
  • Feed Water Heaters — Preheat boiler feed water using waste heat
  • Reboilers — Provide heat input for fractionation tower bottoms (thermosyphon or kettle type)
  • Gas Coolers — Cool refinery fuel gas, hydrogen, and other process gas streams
  • Intercoolers / Aftercoolers — Cool compressed process gas between compressor stages
  • Heat Recovery Units — Recover thermal energy from refinery off-gas and product streams
The removable bundle design allows for mechanical cleaning, visual inspection, and bundle replacement without disturbing shell-side piping — critical for refinery turnarounds and maintenance planning.

Technical Advantages and Customization
Thermal Expansion Management
The U-tube design inherently accommodates differential thermal expansion between tube and shell sides. Each tube bends independently, eliminating axial stress that would otherwise require expansion joints in fixed-tubesheet designs. This is particularly valuable in refinery services where temperature differences can exceed 100°C between inlet and outlet.
Single Tubesheet Construction
With only one tubesheet, the design reduces shell-side leakage paths compared to floating head designs, and simplifies the tube-to-tubesheet joint inspection.
Removable Bundle for Maintenance
The tube bundle can be withdrawn from the shell for cleaning, retubing, or replacement — reducing downtime during planned maintenance.
Custom Engineering Capabilities
  • Custom tube layout and baffle spacing to match process thermal and hydraulic requirements
  • Material selection per client corrosion and temperature specifications (carbon steel, alloy steel, stainless, duplex, titanium)
  • Tube-to-tubesheet joints: roller-expanded, strength-welded, or expanded-and-welded per design
  • Full material traceability with certified Mill Test Reports (MTRs)
  • ASME U Stamp with National Board registration
  • Optional coatings, cladding, or corrosion allowance per client specification

Frequently Asked Questions / Technical Considerations
Q: Why specify a U-tube bundle instead of a fixed tubesheet design for refinery service?
A: U-tube bundles eliminate thermal stress caused by differential expansion between tubes and shell — a common failure mode in refinery units with large temperature differentials. The single tubesheet design also reduces the number of potential leak paths.
Q: What is the minimum U-bend radius?
A: Per ASME and TEMA standards, the minimum centerline bend radius is typically 2* the tube outside diameter (R ≥ 2* OD). This ensures bend quality and prevents excessive wall thinning. Our CNC mandrel bending maintains wall thinning ≤ 12% (ASME limit: ≤ 17.5%).
Q: What documentation is provided with an ASME U Stamp bundle?
A: Each U-tube bundle is supplied with the ASME Manufacturer's Data Report (Form U-1 or U-2), certified Material Test Reports (MTRs) for all pressure-retaining components, NDE reports, hydrostatic test records, and welding procedure / welder qualification records.
Q: Can the bundle be designed for sour service (wet H₂S)?
A: Yes. For refinery sour service applications, material selection follows NACE MR0175 / ISO 15156 requirements with appropriate hardness controls and weld procedure qualifications. Carbon steel grades can be specified with HIC-resistant properties upon request.
Q: What is the typical lead time for a custom U-tube bundle?
A: Lead times range from 45 to 150 days depending on bundle complexity, material availability, and shop load.

For technical specifications, custom engineering support, or to request a quotation for your refinery U-tube bundle project, please contact Yuhong Group Co., Ltd. directly: vladimir@steelseamlesspipe.com
Custom carbon steel U-tube bundle for heat exchanger applications in oil refinery services

Company Details

Bronze Gleitlager

,

Bronze Sleeve Bushings

 and 

Graphite Plugged Bushings

 from Quality China Factory

  • Business Type:

    Manufacturer,Exporter,Trading Company,Seller

  • Year Established:

    1990

  • Total Annual:

    50M-75M

  • Employee Number:

    50~850

  • Ecer Certification：

    Verified Supplier

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  • YUHONG HOLDING GROUP CO., LTD
  • 20 Floor, No.1 New World Building, NO.1018 Min'an Road, Yinzhou District, Ningbo, China, ZIP:315040
  • https://www.tema-heatexchanger.com/

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