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Custom Stab-In Bundles for Process Vessels and Heating Systems

Stab-in bundles are in-vessel heat-transfer assemblies designed to deliver process heating directly within process vessels. These units are commonly applied in reboiler-style service and other heating duties where compact integration and direct heat transfer are required. Our approach focuses on building bundles that fit the vessel geometry and support reliable thermal performance under operating conditions.

Krueger Engineering produces stab-in bundles using the efficient engineering and fabrication practices applied to our shell-and-tube heat exchangers. Our services include precision CNC tube-sheet drilling, custom tube arrangements, and U-tube or straight bundle types, depending on your needs. Our in-house production and assembly take place at our Houston facility, giving us full control over machining, welding, and bundle assembly. This integrated manufacturing approach allows us to deliver bundles that meet exact fit-up requirements and perform reliably in process service.

Why Choose Krueger Engineering for Stab-In Bundle Fabrication

Each Krueger Engineering stab-in bundle is configured to meet specific thermal and mechanical requirements, supporting reliable operation within process vessels and heating systems.

Capabilities & Specifications

  • Shell-and-Tube Bundle Engineering
    We apply our shell-and-tube heat exchanger experience to engineer stab-in bundles for specific process heating requirements.
  • Precision CNC Tube Sheet Drilling
    Our shop uses CNC drilling to ensure accurate tube sheet alignment and consistent bundle assembly.
  • Custom Tube Layout and Bundle Configuration
    We configure tube layouts and bundle geometry to match your vessel dimensions and thermal duty.
  • U-Tube and Custom Bundle Fabrication
    Krueger Engineering fabricates both U-tube and custom bundle designs to suit a range of in-vessel applications.
  • ASME-Certified Shop Manufacturing
    All fabrication is completed in our ASME-certified facility to support vessel integrity and consistent manufacturing quality.
  • In-House Welding and Heat Treatment
    Our controlled welding and heat treatment processes support consistent fabrication quality.
  • Tube Welders and Radial Drill Capability
    Our facility is equipped with specialized tube welders and radial drills to support precise bundle fabrication.
  • Bundle Handling in a 110,000 sq. ft. Houston Facility
    We manage bundle assembly and handling within our fully equipped Houston facility for efficient production and quality control.

Benefits

  • Efficient In-Vessel Heat Transfer
    Krueger Engineering stab-in bundles deliver direct heat transfer within the vessel, improving heating efficiency.
  • Reduced External Piping Requirements
    Our in-vessel bundle configurations help you minimize external piping and simplify system layout.
  • Reliable Performance in Process Service
    We build bundles to perform consistently under demanding operating conditions.
  • Support for Compact Equipment LayoutsOur configurations help you optimize space within process equipment and plant layouts.
  • Custom Fit for Specific Vessel Requirements
    Each bundle is fabricated to match your vessel dimensions and installation requirements.
  • Strong Fabrication Control and Quality Assurance
    Our in-house manufacturing approach ensures consistent quality and full control over fabrication.

Krueger Engineering stab-in bundles are built to match your process requirements, delivering reliable fabrication and consistent performance in process heating applications.

Explore Our Full Range of Products

Boilers
Boilers

Krueger Engineering and Manufacturing specializes in the design and production of high-capacity boilers, including waste heat recovery systems, built to your exact process requirements. We turn complex thermal specifications into rugged, reliable equipment that powers your most critical operations.

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Waste Heat Boilers
Waste Heat Boilers

Krueger Engineering and Manufacturing designs and fabricates waste heat recovery boiler systems that capture thermal energy from industrial process gases and convert it into usable steam for power generation, refining, and petrochemical operations.

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Heat Exchangers
Heat Exchangers

Krueger Engineering delivers advanced heat exchanger systems, from feed-effluent designs to rod baffle and transfer line configurations, optimized for thermal efficiency, uptime, and durability.

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Reboilers
Reboilers

Krueger Engineering and Manufacturing designs and fabricates high-performance reboilers, including specialized glycol reboilers and process heaters. Our team ensures every unit is tailored to meet your unique specifications and exacting process requirements.

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Glycol Reboilers
Glycol Reboilers

Krueger Engineering manufactures high-performance glycol reboilers designed to efficiently regenerate glycol in natural gas dehydration systems, ensuring reliable operation under demanding industrial conditions.

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Heaters
Heaters

Krueger Engineering and Manufacturing is a leading industrial heater manufacturer delivering heavy-duty thermal systems engineered for high-pressure, high-temperature, and corrosive process environments across critical industrial operations.

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Fuel Oil Heaters
Fuel Oil Heaters

Krueger Engineering and Manufacturing designs and builds fuel oil heaters that precisely raise the temperature of heavy fuel oils to the required viscosity, ensuring stable pumping and atomization for efficient combustion.

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Steam Coils
Steam Coils

Krueger Engineering manufactures custom industrial steam coils designed to efficiently heat air by transferring latent heat as steam condenses, delivering precise thermal control for complex industrial processes.

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Condensers
Condensers

Krueger Engineering and Manufacturing delivers custom, ASME-compliant industrial condensers tailored to your exact process specifications for maximum thermal efficiency and long-term reliability.

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Surface Condensers
Surface Condensers

Krueger Engineering and Manufacturing delivers custom, ASME-compliant surface condensers tailored to your exact process specifications for maximum thermal efficiency and long-term reliability.

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Steam Condenser
Steam Condenser

Krueger Engineering delivers reliable, ASME-compliant gland condensers in-house, capable of capturing and condensing leakage steam for turbine protection and water recovery.

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Dump Condenser
Dump Condenser

Krueger Engineering designs and manufactures custom ASME-compliant dump condensers for condensing turbine exhaust steam and supporting efficient plant operation.

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End-to-End Fabrication Services for Industrial Thermal Equipment

Krueger Engineering and Manufacturing provides a full suite of in-house services to ensure every component of your custom equipment meets our strict quality and performance standards:

Beveling

Krueger Engineering provides precision edge preparation for steel plates up to 2” thick, ensuring optimal weld penetration and structural integrity for your most demanding projects.

Eccentric & Concentric Cones

We manufacture eccentric and concentric cones to meet exact project requirements across demanding industrial applications.

Forming

Krueger Engineering provides precision steel forming services for heavy industrial parts and custom-fabricated components.

Pipe and Plate Forming

Krueger Engineering provides precision pipe and plate forming services for heavy-duty industrial applications. We form heavy walls and high-strength pipe with the accuracy and consistency required for demanding projects.

Plasma Cutting

Krueger Engineering delivers precision plasma cutting services for industrial plate fabrication and edge preparation. Our equipment is built to produce accurate parts, clean cuts, and dependable results for demanding applications.

Plate Bending

Krueger Engineering provides high-capacity plate bending services for industrial projects that require accuracy, repeatability, and dependable performance. Our operation is built to support heavy-duty forming for pressure, structural, and custom fabrication applications.

Plate Crimping

Krueger Engineering provides advanced crimping solutions to shape heavy-gauge steel into precise, repeatable geometries. We ensure every profile meets the rigid standards required for large-scale industrial and thermal projects.

Post Weld Heat Treat

Krueger Engineering provides post weld heat treat processing for large fabricated components and tank-related applications.

Rolled Cylinders

Krueger Engineering delivers high-precision cylinders tailored for pressure vessels, storage tanks, and heavy structural applications.

Rolling

Krueger Engineering provides high-capacity plate rolling services for industrial projects that require controlled forming, repeatable geometry, and dependable fabrication performance.

Welding and Cutting

Krueger Engineering delivers welding and cutting services for complex fabrication work that demands strength, control, and code-focused execution.

Engineering

Krueger delivers engineering support for custom heat transfer equipment and complex industrial projects. Our team combines specialized design software with experienced technical review to develop solutions that are practical to build and built to perform.

Talk to Our Engineers About Your Stab-In Bundle Requirements

Tell us your vessel dimensions, heat duty, and process requirements, and Krueger engineers will work with you to design a custom stab-in bundle for your application. We provide custom engineering, fabrication, and testing to deliver bundles built for reliable process heating performance.

Frequently Asked Questions About Stab-In Bundles

A stab-in bundle is a heat-transfer assembly installed inside a vessel to perform heating duty without the need for an external heat exchanger.
A stab-in bundle is used where space is limited or where direct vessel heating is preferred to minimize external piping.
We review vessel dimensions, heat duty, fluid properties, operating temperature, pressure, and installation constraints.
Materials used would be based on process requirements, which often involve carbon steel, stainless steel, or alloys.
Vessel size and geometry determine bundle length, diameter, tube layout, and overall configuration for proper fit and performance.
CNC tube-sheet drilling, precision welding, assembly, and bundle handling are critical fabrication capabilities for stab-in bundle manufacturing.
Bundles undergo non-destructive testing and hydrostatic testing to verify structural integrity and fabrication quality before delivery.

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