Heat Exchanger Front Head Channel Box
ASME Code Construction with A/B/C/D Type Options for Tube-Side Distribution
About Yuhong Group
Yuhong Group Co., Ltd. is a comprehensive supplier of engineered thermal equipment and precision components. We manufacture custom shell & tube heat exchangers, pressure vessels, and a full spectrum of replacement parts, including tube bundles, U-tubes, heat exchanger tubes, finned tubes, and all critical accessories such as tubesheets, baffles, and channel heads.
Product Overview: Front Head Channel Box
The front head channel box, also known as the stationary head or header, is a vital component of any shell and tube heat exchanger. It serves as the inlet and outlet chamber for the tube-side fluid, distributing the flow into the tubes and collecting it upon exit. Manufactured to ASME Code requirements, our channel boxes are available in various TEMA standard types—including A (Channel and Removable Cover), B (Bonnet), C (Channel Integral with Tubesheet), and D (Special High Pressure Closure)—to match your specific exchanger configuration and service conditions.
Component Specifications
| Channel Box Component |
Available Material Standards |
Function & Customization Notes |
| Main Channel Shell |
ASME SA516 Gr.70, SA240 304/316L, SA105 |
The cylindrical body containing the fluid chamber; material selected based on tube-side corrosivity and pressure. |
| Channel Cover (for A-Type) |
ASME SA516 Gr.70 or SA240 316L |
Removable cover providing access to tube ends for inspection, cleaning, or plugging without disturbing piping. |
| Bonnet (for B-Type) |
Cast Iron, SA105 Forged, or SA350 LF2 |
An integral cover design offering a compact, leak-resistant closure for the channel. |
| Nozzles / Connections |
SA105 Forged, SA182 F316L |
Inlet and outlet ports for tube-side fluid; available in various sizes, ratings, and orientations. |
| Pass Partitions |
Same as channel material |
Divides the channel into multiple passes (2-pass, 4-pass, etc.) to increase tube-side velocity and heat transfer. |
| Gaskets & Bolting |
Various (Spiral Wound, Metal-Jacketed) + SA193 B7 Studs |
Ensures leak-tight sealing between channel, tubesheet, and cover under operating pressure and temperature. |
TEMA Standard Front-End Head Designs
Type A - Flat Cover Channel (Channel and Removable Cover)
One of the most common designs. The head body is welded to the tube sheet or cast integrally, sealed by a removable flat cover. Advantages: The tube ends can be inspected or plugged by removing the flat cover without dismantling pipe connections, making maintenance convenient.
Type B - Bonnet/Integral Cover
The head body and cover are an integral design, like a "hat" directly fixed to the tube sheet with bolts. Advantages: Compact structure, fewer sealing surfaces, suitable for space-constrained applications or applications with strict leakage risk requirements.
Type C - Channel Integral with Tubesheet
The head body and tube sheet are forged or cast as a single component. Advantages: Eliminates the sealing surface between the head and tube sheet, suitable for high-pressure conditions or services with zero tolerance for leakage.
Type D - Special High Pressure Closure
Designed for extremely high pressures, it employs a special sealing structure (such as lens gaskets, double cone seals, etc.) to ensure reliability under extreme pressures.
Key Features & Benefits
- Fully ASME Compliant Manufacturing: All end caps and tube boxes are designed, manufactured, and inspected according to ASME standards, providing complete Material Quality Reports (MTR) and manufacturing data reports.
- Multi-Pass Design Support: Based on thermal calculations, partitions can be installed within the channels to achieve 2, 4, 6, or more tube passes, optimizing flow rates and heat transfer coefficients.
- Material Combination Flexibility: For corrosive tube-pass fluids, stainless steel lining, weld overlay, or composite plate structures can be used, ensuring corrosion resistance while reducing costs.
- Customized Nozzle Placement: Nozzles can be placed at any angle and location to meet your piping layout requirements, simplifying on-site piping work.
Typical Application Areas
The front-end end cap box is a key component in various heat exchanger configurations, widely used in:
- Refining and Petrochemical Industry: Reactor feed/discharge heat exchangers, tower top condensers
- Power Industry: High-pressure heaters, low-pressure heaters, condenser water chambers
- Marine and Shipbuilding: Seawater coolers, intercoolers
- General Industry: Process heaters, coolers, reboilers
Request a Custom Quote
Whether you need a standard Type A flat-cover channel, a Type B end cap box, or a Type C or D design to meet high-pressure requirements, our engineering team can provide a precisely matched solution based on your drawings or process parameters. Please send your technical requirements to jimmy@steelseamlesspipe.com for detailed technical confirmation and a quotation.
english
français
Deutsch
Italiano
Русский
Español
português
Nederlandse
ελληνικά
日本語
한국
polski
فارسی
বাংলা
ไทย
tiếng Việt
العربية
हिन्दी
Türkçe
indonesia
Overall Rating
Rating Snapshot
The following is the distribution of all ratingsAll Reviews