Yuhong Group Co., Ltd. is a certified manufacturer and exporter of high-precision pressure vessel heads and custom closures designed for industrial process equipment. Serving global industries through www.tema-heatexchanger.com, we supply a complete range of cold-formed and hot-stamped dished heads engineered to perform seamlessly with high-pressure shell and tube heat exchanger systems, boilers, reactors, and air cooling units.
Whether you are retrofitting an existing shell & tube heat exchanger, replacing a channel head enclosure, or sourcing complete internal components—including a precision-machined heat exchanger tubesheet, custom u tube bundle, or heavy-duty finned tube bundle—Yuhong Group offers custom-engineered ASME Section VIII Div. 1 compliant solutions.

We manufacture dished heads in a wide variety of geometry profiles to suit distinct pressure ratings, wall thickness demands, and space limitations:

• 2:1 Semi-Elliptical Heads (Ellipsoidal Heads): The most widely used closure for medium-to-high pressure vessels and shell and tube heat exchanger channels, offering superior stress distribution and economic material utilization.
• Hemispherical Heads: Engineered for extreme high-pressure applications where wall thickness can be reduced while maintaining structural integrity.
• Torispherical Heads (Flanged and Dished / F&D): Cost-effective closures suitable for lower to moderate operating pressures.
• Flat Heads & Forged Cover Plates: Heavy forged discs precision-machined for removable channel covers and high-pressure plug headers.
• Conical Reducers & Transition Sections: Custom cone sections used for diameter transitions in specialized heat exchange vessels.

To withstand severe mechanical fatigue, high temperatures, and aggressive corrosive media, Yuhong Group supplies heads manufactured from certified plate and forging stocks:

A quality dished head is only one part of an efficient thermal processing system. Yuhong Group supplies fully integrated component packages to simplify your procurement and turnaround maintenance:

1. Precision Edge Beveling: All heads feature CNC-machined welding bevels (V, U, or compound bevels) to ensure full penetration welds and effortless fit-up during shell assembly.
2. Post-Forming Heat Treatment: Solution annealing (for stainless/duplex grades) or stress relieving is performed in-house to eliminate cold-work residual stresses and restore optimal corrosion resistance.
3. Severe Duty Capability: Ideal for heavy refining, petrochemical processing, offshore platforms, and power generation units handling lethal or highly acidic fluids.
4. 100% Quality Assurance: Certified with complete Mill Test Reports (MTRs to EN 10204 3.1/3.2), RT/UT weld seams inspection, and 3D dimensional laser scanning.

When sourcing or replacing a shell and tube heat exchanger head or vessel closure, technical engineers and procurement managers should verify the following key factors:

• Inside Diameter (ID) vs. Outside Diameter (OD) Specification: Always specify whether dimensions refer to ID or OD, as hot/cold forming tolerances can affect the final joint fit to the shell cylinder.
• Minimum Wall Thickness After Forming: Forming processes cause thinning at the crown and knuckle radii. Always calculate required nominal plate thickness based on post-forming minimum thickness requirements.
• Heat Treatment Requirements: Stainless steel heads (e.g., SA240 321/316L) subjected to severe forming require full solution heat treatment to prevent intergranular corrosion in service.

Need a custom-formed ASME elliptical head, a replacement tube bundle, or a precision-machined heat exchanger tubesheet?
Contact the Yuhong Group engineering team today for rapid pricing and technical consultation:

• Email: jimmy@steelseamlesspipe.com
• Official Website: www.tema-heatexchanger.com
• Company: Yuhong Group Co., Ltd.