ASME Code Fabrication Shell & Tube Heat Exchanger with Fixed, Floating & U-Tube

Yuhong Group Co., Ltd. engineers thermal equipment that prioritizes long-term reliability and ease of maintenance. Our portfolio includes shell & tube heat exchangers, pressure vessels, and air coolers, backed by a complete supply of tube bundles, U-tubes, finned tubes, and all associated parts (tubesheets, baffles, heads, nozzles). Whether you need a new unit or a replacement core, we deliver solutions that keep your process running.

Our industrial heat exchangers are conceived with two guiding principles: minimize unplanned downtime and simplify field maintenance. Every design choice—from tube layout to gasket selection—is made with the end user's operating environment in mind. We offer fixed tubesheet, floating head, and U-tube configurations, each selected based on your cleaning frequency, thermal duty, and access constraints.

Material selection directly affects the initial investment and long-term operating costs of the equipment. The following are recommended pathways for typical industrial media:

• Pre-reserved location for sacrificial anodes: In seawater or brackish water coolers, even with copper-nickel alloys, pre-reserved mounting holes for replaceable zinc anodes in the tube box or tube sheet effectively protect the tube sheet and tube ends, extending life by more than 30%.
• Shell-side venting and draining ports: Installing venting and draining valves of DN20 or larger at the highest and lowest points of the shell side during design can completely eliminate air resistance during startup and liquid accumulation after shutdown, avoiding cavitation and dead zone corrosion.
• Tube Bundle Removal Guide Device: For large floating head heat exchangers, adding slide rails or guide bars inside the shell can significantly reduce mechanical damage to baffles and tubes during tube bundle removal and installation.

• Outlet Temperature Deviates from Design Value: If the hot fluid outlet temperature increases (insufficient cooling) or decreases (insufficient heating), first suspect tube bundle scaling or shell-side bypass leakage. Countermeasure: Check for increased pressure drop; plan chemical or mechanical cleaning.
• Abnormally Increased Pressure Difference Between Tube Side and Shell Side: A significant increase in pressure difference usually indicates blockage in the tube bundle or shell-side channels. Countermeasure: Backflushing or disassembly and inspection.
• Slight Leakage at Tube Sheet or Shell Flange: This may be due to aging gaskets or loose bolt preload. Countermeasure: Tighten bolts appropriately while hot; if ineffective, replace gaskets. Never tighten under pressure; depressurize according to procedures before operation.

• Seamless Replacement: Based on on-site surveys or existing drawings, our new heat exchangers or tube bundles are 100% compatible with the original equipment in terms of dimensions, interface orientation, and bolt hole spacing.
• Performance Upgrade Options: Without changing the shell, by adopting high-efficiency heat exchange tubes (corrugated tubes, finned tubes) or optimizing the baffle layout, the heat exchange capacity of the original equipment can be increased by 20-40%.
• Spare Parts Package and Emergency Response: We can create a critical spare parts list for your heat exchangers (gaskets, bolts, sacrificial anodes) and promise rapid delivery for urgent orders.

• Atmospheric and Vacuum Distillation Units in Oil Refineries: Floating head type, made of carbon steel or chrome-molybdenum steel, is recommended to cope with large temperature differences and media corrosion.
• Reactor Jackets or Internal Coils in Chemical Plants: U-tube type or fixed tube sheet type is recommended, made of 304/316L stainless steel, meeting cleanliness requirements.
• Power plant auxiliary equipment cooling: Fixed tube sheet type is recommended, made of carbon steel or stainless steel, with backflushing on the water side.
• Offshore platform seawater coolers: Floating head or U-tube type is recommended, made of 90/10 copper-nickel or titanium, and must be equipped with sacrificial anodes.