Precision machining of large, heavy components is a core Roben Manufacturing capability. Our drilling and milling services handle the demanding work that smaller shops cannot, from drilling tubesheets up to 470 inches in diameter to machining components on centers up to 60 inches in diameter and 50 inches high.
Tubesheet drilling in particular is exacting work: thousands of precisely located, accurately sized holes whose tolerances determine whether a heat exchanger's tubes seat and seal correctly. We bring the equipment and experience to do this and other heavy machining right.
Heavy Drilling and Milling for Demanding Components
Tubesheet drilling is one of the most precise operations in heat exchanger fabrication. Each hole must be located accurately on the tube pattern and drilled to the correct diameter and finish so the tubes seat and seal. We drill tubesheets from 4 inches up to 470 inches in diameter and from 1 inch up to 35 inches thick, producing the high-quality hole patterns that high-integrity tube-to-tubesheet joints require.
Our drilling capability extends to large work envelopes up to 120 by 120 by 15 inches thick, accommodating the heavy plates and components common in process equipment. This lets us drill flanges, supports, and structural components that would otherwise require outside machining and additional handling.
Milling on our machining centers, with capacity up to 60 inches in diameter and 50 inches high, handles flange faces, sealing surfaces, mounting features, and other precision surfaces. Combined with our lifting capacity of up to 200 tons, we can manipulate and machine very large, heavy parts safely and accurately.
Performing this machining in-house, under the same quality system as our fabrication, keeps tight tolerances controlled and removes the schedule risk of shipping parts out for machining. Whether the machining supports a complete Roben vessel or is supplied as a standalone service, the work is documented and dimensionally verified.
Why Choose Roben Manufacturing
- Precision tubesheet drilling. We drill tubesheets from 4 to 470 inches in diameter with the accuracy high-integrity tube joints demand.
- Large drilling envelope. Drilling up to 120 by 120 by 15 inches handles the heavy plates and components of process equipment.
- Large-part machining centers. Milling up to 60 inches diameter and 50 inches high machines flange faces, sealing surfaces, and features.
- 200-ton handling capacity. Our lifting capability lets us manipulate and machine very large, heavy parts safely and accurately.
- In-house quality control. Machining under our own quality system keeps tolerances controlled and removes outside-machining schedule risk.
Key Features & Capabilities
- Tubesheet drilling from 4 to 470 inches diameter
- Tubesheet thickness from 1 to 35 inches
- Drilling envelope up to 120 by 120 by 15 inches thick
- Machining centers up to 60 inches diameter and 50 inches high
- Flange-face and sealing-surface machining
- Mounting-feature and precision-surface milling
- Lifting capacity up to 200 tons for heavy parts
- Accurate tube-pattern hole location and sizing
- Standalone machining or integrated with fabrication
- Dimensional verification and documentation
Applications & Industries Served
- Heat exchanger tubesheet drilling
- Flange and nozzle machining
- Large structural and support component machining
- Sealing-surface finishing on vessels and exchangers
- Heavy-plate drilling for process equipment
- Outsourced precision machining for other fabricators
Codes, Standards & Quality Assurance
Roben Manufacturing fabricates under a controlled quality system and holds the ASME U Certificate of Authorization, with registration through the National Board of Boiler and Pressure Vessel Inspectors. Every applicable project is supported by material test reports, qualified welding procedures, nondestructive examination records, and complete documentation.
Relevant standards and resources include: ASME Boiler and Pressure Vessel Certification; TEMA — Tubular Exchanger Manufacturers Association.
Frequently Asked Questions
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