Repair & Fabrication

Heat Exchanger Fabrication
Dunn is best known as an emergency repair shop, but we also engineer and fabricate shell and tube type heat exchangers, both larger and small. We have the facilities, lifting capacity, equipment, and a team of experienced craftsmen ready to handle all your heat exchanger needs. Whether the demands include cleaning, repairing, retubing, replacing or designing and fabricating new equipment, we can deliver. Capable of operating 24/7, we are ready to respond to your needs day or night.
Heat Exchanger Transportation

Dunn Heat Exchangers, Inc. has all the machining capabilities needed for repairs and complete fabrication. We utilize modern CNC drilling equipment, as well as the conventional radial arm drills, vertical boring mills, and horizontal boring mills. 100% of all machining needs are performed in-house. Request a plant tour today and discover why Dunn is a leader in heat exchanger emergency repair.
CNC Drilling Machine

Dunn has all the tools, equipment, tradesmen, and know how for fast turnaround of retubing, tube plugging, and repairs.

Heat Exchanger Retubing

ASME Code Welding
Dunn Heat Exchangers, Inc. is capable of meeting the most stringent welding requirements. We are capable of the fabrication and repair of most materials. We utilize welding techniques, such as Submerged Arc Welding (SAW), Gas Tungsten Arc Welding (GTAW), Gas Metallic Arc Welding (GMAW), and Shielded Metallic Arc Welding (SMAW), and more. We maintain more than 120 ASME qualified welding procedures. For your specific welding requirements, please contact Dunn's QA / Inspection Unit.
Heat Exchanger Repairs

Inspection & Quality Assurance
The company's Quality Assurance Department ensures that fabrication and repair needs meet the latest code requirements of American Society of Mechanical Engineers (ASME) and Tubular Exchanger Manufacturers Association, Inc. (TEMA). Quality Assurance (QA) also helps customers determine the repairs required to return equipment to service as quickly as possible, minimizing critical unit downtime. Members of our QA personnel are certified by the American Society of Non-Destructive Testing (ASNT) SNT-TC-1A, American Petroleum Institute (API) 510, and American Welding Society AWS - CWI - CWE and in accordance with those standards.
Heat Exchanger Testing