Yuhong Group Co., Ltd. supplies fabricated tube bundles for shell-and-tube heat exchangers, pressure vessels, and air-cooled heat exchangers. Our scope includes U-tube bundles, straight-tube fixed tube sheet bundles, and floating head designs, alongside replacement tube bundles for refinery, petrochemical, and power generation retrofits. Complementary supply covers heat exchanger tubes, finned tubes, tube sheets, baffle plates, and channel heads - all coordinated to TEMA, ASME, and client-specific datasheet requirements.
A tube bundle comprises the complete tube-side assembly of a shell-and-tube heat exchanger: tubes, tube sheets, baffles, tie rods, and spacers. The bundle is removable (floating head or U-tube) or fixed (fixed tube sheet) depending on service requirements. Each bundle is engineered for specified thermal duty, pressure drop, and fouling resistance, with tube layout (triangular, square, or rotated square) selected to optimize film coefficients and cleaning accessibility.
| Component | Materials | Applicable Standards |
|---|---|---|
| Heat exchanger tubes | Carbon steel (SA-179, SA-192, SA-210), Stainless steel (304/304L, 316/316L, 321), Duplex (2205, 2507), Copper alloys (C12200, C70600), Titanium (Gr.2) | ASTM A213, A269, A249, B111, B338 |
| Tube sheets | Carbon steel, SA-516 Gr.70, Stainless steel clad, Alloy steel | ASME SA-516, SA-240 |
| Baffles / Support plates | Carbon steel, Stainless steel | ASME SA-516 / SA-240 |
| Tie rods & spacers | Carbon steel, Stainless steel | ASTM A193 / A320 |
Tube ends are expanded, welded, or both (strength-welded plus expanded) to tube sheets per TEMA RCB-2. U-tube bundles are formed with bend radii ≥1.5× tube OD to maintain wall thinning within acceptable limits.
| Test / Examination | Method / Standard | Acceptance Criteria |
|---|---|---|
| Hydrostatic test | ASME Section VIII UG-99 | No leakage at 1.3× design pressure |
| Pneumatic test | ASME Section VIII UG-100 (when specified) | No pressure drop |
| Tube-to-tubesheet joint | Expanded joint pull-out test (TEMA RCB-2.22) | 2× design pressure retention |
| Eddy current testing (ECT) | ASTM E571 or E2096 | Reference standard calibration |
| Acoustic Pulse Reflectometry (APR) | ASTM E2906/E2906M | Internal flaw detection & identification |
| Radiographic / Ultrasonic | ASME Section V | Weld examination |
| Dye penetrant | ASME Section V | Surface defect detection |
APR examination is applied for both new fabrication quality control and in-service bundle inspection - detecting through-wall holes, ID pitting, erosion, blockages, and bulging without tube removal.
For applications prone to scaling or particulate fouling, specify square pitch (90° or 45°) to enable mechanical cleaning. Triangular pitch (30°) maximizes tube count for a given shell diameter but restricts access.
Provide the original tube sheet layout drawing or measure: tube sheet diameter, tube count, tube OD and wall thickness, tube pitch, baffle spacing, bundle length (overall and tube-to-tube sheet), and inlet/outlet nozzle locations. Our engineering team conducts interference checks prior to fabrication.
Minimum bend radius is 1.5× tube OD for seamless carbon steel and stainless steel; 2.0× for copper alloys. Tighter radii risk excessive wall thinning (>12.5% nominal wall).
Hydrostatic test after rolling and/or welding confirms joint integrity. For critical services, helium leak test can be specified.
Yes. Replacement bundles are fabricated to your existing exchanger drawings. On-site measurement services are available to confirm as-built geometry.
