ASME Standard Carbon Steel Heat Exchanger Tube Bundle | Seamless Tube & Custom

Yuhong Group Co., Ltd. is a fully integrated manufacturer of raw heat transfer tubing, severe-service pressure equipment, and replacement thermal cores. We engineer and fabricate custom heat exchanger tube bundle assemblies, straight/bent tube arrays, high-efficiency Fin Tube modules, and heavy forged heat exchanger tubesheet plates for demanding industrial process operations.

As a primary seamless steel pipe and tubing manufacturer, Yuhong Group maintains direct quality control from raw material melting through precision machining and final assembly. Our production capabilities cover a broad range of metallurgy, including Stainless Steel Seamless Tube, Furnace Tube, Nickel Alloy Tube, Copper alloy tube, and heavy-wall carbon steel tubing. We build complete process Heat Exchanger systems as well as direct drop-in replacement bundles designed strictly to TEMA, ASME Section VIII Div 1, and API 660 standards.

We engineer thermal replacement cores matching original OEM equipment geometry or upgraded process requirements across standard mechanical designs:

• Removable U-Tube Bundle (TEMA U): Features bent Heat Exchanger Tube arrays secured to a single tubesheet. This configuration accommodates high differential thermal expansion between shell and tubes without causing mechanical fatigue at tube-to-tubesheet joints.
• Floating Head Tube Bundle (TEMA S/T): Built with a stationary heat exchanger tubesheet at one end and an internal floating head at the other, permitting complete core withdrawal for mechanical cleaning of shell-side foulants in crude oil applications.
• Fixed Tubesheet Bundle (TEMA E/F): Rigid dual-tubesheet design ideal for steady-state thermal duties, low operating temperature differentials, or shells fitted with expansion joints.
• Air-Cooled Finned Core Assemblies: Integrates high-density Fin Tube modules (extruded aluminum, L-foot, KL-foot, or embedded G-fin) onto base tubes to maximize heat dissipation in air cooling systems.

• Carbon Steels: ASTM A179 (low-carbon seamless cold-drawn), ASTM A214 (electric-resistance-welded), ASTM A210 Grade A1/C, SA334 Grade 6 (low-temperature service).
• Seamless Alloy Steels: ASTM A213 T11, T22, T91 Furnace Tube grades for high-temperature boilers and fired heaters.
• Stainless & Corrosion-Resistant Alloys: Stainless Steel Seamless Tube (304/304L, 316/316L, Duplex 2205, Super Duplex 2507), Nickel Alloy Tube (Inconel 625, Hastelloy C276, Monel 400), and Copper alloy tube (CuNi 90/10, CuNi 70/30) for brackish or seawater cooling loops.

• Direct Tube Mill Control: Producing seamless tubing in-house guarantees tight outer diameter (OD) control, wall thickness uniformity, and high surface finish along the total length of every Heat Exchanger Tube.
• Torque-Controlled Hydraulic Expansion: Automated expansion into double-grooved tubesheet holes--combined with optional seal welding--ensures zero-leakage joint integrity under operating pressures exceeding 20 MPa.
• U-Bend Stress Relieving: Cold-bent zones on U-tube configurations undergo controlled solution annealing or stress-relief heat treatment to restore corrosion resistance and prevent Stress Corrosion Cracking (SCC).
• 100% Quality Verification: NDE protocols include Hydrostatic Pressure Testing, Eddy Current Testing (ET) on tubing, Radiographic Testing (RT) on pressure welds, Liquid Penetrant Testing (PT), and Positive Material Identification (PMI).

1. Managing Flow-Induced Vibration (FIV): High shell-side cross-flow velocities can induce tube fluttering, resulting in fretting wear at baffle contact points or tube fatigue failure. Recalculating unsupported tube lengths, adjusting baffle spacing, or integrating rod baffles resolves FIV issues in gas coolers.
2. Pitch Geometry & Mechanical Maintenance: When ordering replacement cores for heavy fouling media, specifying a 90° or 45° square tube pitch layout creates continuous cleaning lanes for high-pressure hydro-blasting during turnaround maintenance. A 30° triangular pitch is recommended for clean fluids to maximize heat transfer density.
3. Baffle-to-Shell Clearance Rules: Outer Tube Limit (OTL) and baffle outer diameter must strictly adhere to TEMA standards. Excessive clearance allows process fluid to bypass the tube array along the inner shell wall, significantly lowering thermal efficiency in Tema heat exchanger units.

• Petroleum Refining: Crude Distillation Unit (CDU) preheat trains, hydrocracker feed exchangers, amine treating reboilers, and overhead condensers.
• Petrochemical & Chemical Production: Ethylene plant quench exchangers, nitric acid coolers, and aromatics separation units.
• Natural Gas Processing: Gas sweetening reboilers, glycol regeneration units, and compressor intercoolers/aftercoolers.
• Power Generation & Utilities: Boiler feedwater heaters, turbine oil coolers, and gland steam surface condensers.