Carbon Steel Shell & Tube Heat Exchanger with Fixed Tubesheet Floating Head and U-Tube Designs for Refinery Power HVAC

Yuhong Group Co., Ltd. engineers and fabricates reliable thermal systems, including shell & tube heat exchangers, pressure vessels, and air coolers, for customers worldwide. We also manufacture replacement tube bundles, U‑tubes, finned tubes, heat exchanger tubes (carbon, stainless, alloy), and essential parts such as tubesheets, baffles, and channel heads to support efficient plant operation and maintenance.

The carbon steel shell & tube heat exchanger is the most widely specified design for non‑corrosive and mildly corrosive duties - cooling lubricating oil, condensing steam, heating process water, or inter‑cooling natural gas. Our units are built to ASME Boiler & Pressure Vessel Code, using SA179 seamless tubes and SA516 Gr.70 shell plates, with SA266 Gr.2 forged tubesheets for long‑term mechanical integrity. We offer three standard configurations - fixed tubesheet, floating head, and U‑tube - each matched to your cleaning interval, temperature difference, and pressure requirements.

• Thermal design flexibility: We calculate tube count, pitch, and baffle spacing using industry‑standard software (HTRI) to meet your exact duty - flow rates, inlet/outlet temperatures, and allowable pressure drop.
• Erosion protection: For high‑velocity or particle‑laden inlet streams, a stainless steel or alloy impingement plate is fitted opposite the nozzle to protect tube ends.
• Leak‑tight tube‑to‑tubesheet joints: Precision rolling + seal welding ensures zero bypass even under thermal cycling.
• Expansion joint option: For fixed tubesheet designs with risk of thermal stress, we can add a bellows‑type expansion joint on the shell.

Carbon steel is the most cost‑effective material for non‑corrosive services. It offers:

• Proven track record in thousands of installations (oil refineries, power plants, compressor stations).
• Excellent weldability and repairability - local repairs or retubing are straightforward.
• Wide availability of tubes and plates - fast delivery for replacement bundles.
• Adequate corrosion resistance provided the water chemistry is controlled (pH 6‑9, low chlorides, oxygen removed).

Even a robust carbon steel unit will eventually show symptoms of degradation. Recognizing these early can save unplanned downtime:

1. Exit temperatures drift from design - If hot fluid outlet is too warm (cooler fouled) or too cold (bypassing), suspect tube scaling or shell‑side channeling. Check pressure drop - a 25% rise above clean condition indicates cleaning is due.
2. Unexplained pressure drop increase - Tube‑side ΔP rising without flow change often means debris in tube inlets or tube collapse. Shell‑side ΔP increase suggests baffle damage or foreign material. Inspect inlet nozzle strainer.
3. Visible leakage at tube‑to‑tubesheet joints - Small weepage can often be re‑rolled. Heavy leakage requires plugging or retubing. If multiple joints leak near the inlet, suspect impingement erosion - install or replace the impingement plate.

• Fit‑to‑print replacement: We manufacture drop‑in tube bundles using your old bundle drawing or a field‑sketched pattern - same tube count, diameter, length, and baffle spacing.
• Material upgrades: Replace degraded carbon steel tubes with 304/316L stainless or copper‑nickel without changing shell dimensions.
• Partial supply: Need only a tubesheet or a set of baffles? We can machine individual components.
• Fast emergency service: For critical failures, we can prioritize a replacement bundle and air‑freight it to your site.

• Oil & gas - crude oil heaters, gas coolers, amine reboilers.
• Power generation - bearing lube oil coolers, generator hydrogen coolers, closed‑cycle water coolers.
• Chemical & petrochemical - reactor feed/effluent exchangers, solvent condensers.
• HVAC & district heating - steam converters, hot water generators.
• Marine & offshore - central cooling systems, engine jacket water coolers (closed loop).

Tell us your service conditions (fluids, temperatures, pressures, flow rates) or send a drawing of your existing exchanger. Our engineers will respond with a datasheet, general arrangement drawing, and firm price. Contact jimmy@steelseamlesspipe.com today.