About AmX
American Exchanger Services, Inc. is the global leader in heat exchanger expertise and innovative engineering in the age of Power Generation Decarbonization.
Our Company
American Exchanger Services, Inc. (AmX) designs and manufactures heat transfer equipment including feedwater heaters, unfired heat exchangers, main steam condensers, and custom designs that are highly engineered, unmatched in quality, and critically efficient across all pillars of the Power Generation industry. AmX is a certified ASME Code Shop holding the “U” Stamp for fabrication, the “R” Stamp for repairs, and the “PP” Stamp for power piping. AmX is a member of HEI, helping to write the standards for the entire heat exchanger industry. We are deeply committed to a decarbonized future with several projects in the hydrogen space and special projects in nuclear fusion.
Our present focuses include:
Providing advanced engineering for the critical service needs for a reduced carbon environment.
Building critical equipment for the extreme conditions required for the next generation of Hydrogen production.
Solving critical engineering challenges for the Small Modular Reactor market.
AmX is headquartered in Hartford, Wisconsin, where we operate two state of the art fabrication and manufacturing facilities. AmX was incorporated in 1984 by Thomas J. Muldoon, PE. Today, under the same ownership, AmX leads the industry in the design, fabrication, and service of heat transfer equipment for the Power Generation, Process, Nuclear, Pulp and Paper, and Renewable Energy industries.
Meet The Team
Meet our award-winning multidisciplinary team based in Hartford, WI with a passion for engineering solutions and building global relationships.
Thomas J. Muldoon
President & Founder
AmX President and founder Tom Muldoon received his Undergraduate BSME from Marquette University with an emphasis in Thermodynamics in 1974 followed by an MBA from University of Wisconsin, Oshkosh 1983.
Tom received his Professional Engineer Certificate and has been an active member of the ASME since 1977, and was elected as ASME Fellow in 2014.
Tom started his career as an Engineering Specialist at UOP, Inc. working with heat exchanger design specifications for the hydrocarbon processing industry. Tom left UOP to work at Perfex Energy Systems Division which specialized in the design and fabrication of high and low pressure heat exchangers for the Power and Process industries. This included performing as the engineering Field Service specialists at Perfex with direct involvement in the field repair, modification, and failure analysis of high pressure heat exchangers. These repair techniques included explosive tube welding and plugging.
In 1985, Tom started Heat Transfer Specialists to perform independent consulting engineering services primarily for the power industry. A year later he founded American Exchanger Services, Inc. (Am-Ex, now AmX) upon the successful negotiation of a licensing agreement with International Research and Development Co. in Newcastle, England for the use of their "impactor" explosive welding technology.
Tom founded AmX after seeing an industry need to provide critical field and shop services and manufacturing of power, process and paper industry plant heat transfer equipment including high pressure feedwater heaters, steam condensers and other heat exchangers. AmX also provides advance fabrication technologies for the manufacture of high reliability feedwater heaters and heat exchangers.
Tom is a diligent contributor to industry organizations. He has authored numerous ASME (American Society of Mechanical Engineers) technical papers on feedwater heaters and condensers, and has presented additional papers at several EPRI (Electric Power Research Institute) Symposiums on High Pressure Feedwater Heaters and Joint Power Generation Conferences. He has also hosted webinars on Main Steam Condenser Design and instructed at the many EPRI Seminars on Feedwater Heaters.
In addition to the expertise in the field of heat transfer, Tom also has provided leadership in the field of high energy rate fabrication, authoring papers on topics including Explosive Welding repairs in nuclear and critical service application. To this end, AmX has been involved in several very specialized and unique R&D projects. One memorable project was building a complex prototype fusion vacuum chamber for a HSX nuclear fusion reactor. In addition, AmX has been involved in boiler tube sleeving, boiler tube explosive stub removal, and explosive forming of the end cowling of a steam turbine.
Tom was also called on to provide expert witness testimony in a lawsuit brought by a group of States’ Attorneys General acidification of lakes in the northeast portion of the United States against a large utility.
As power generation moves toward decarbonization in the future, Tom created a patent on a renewable power generation based only on seasonal temperature changes with a Power Recovery Condensing System. Using its advanced second law thermodynamic software and patented equipment and system designs, AmX will help reduce carbon emissions at exiting and new power plants by increasing efficiency and green generation.
After 37 years of operation, AmX is looking forward to new opportunities and innovations in providing Power, Process and Renewable Energy markets with the best possible engineering and fabrication.
Kellen J. Muldoon
VP Engineering & Sales
Kellen leads both the Engineering and Sales departments. Since 2013, Kellen has been integral in expanding the company's domestic and international reach, particularly in emerging international markets. To this end, the AmX team was awarded the Exporter of the Year (Great Lakes Region) Award from the SBA in 2015.
Kellen's expertise lies in providing value to customers through reliable service and the most effectively engineered equipment and services including Feedwater Heaters, Steam Surface Condensers, and BOP Shell and Tube Heat Exchangers.
Kellen holds a Mechanical Engineering degree from the University of Massachusetts Amherst where he also played on the men’s soccer team. He received his PE License in May of 2022.
Brent L. Jones
Director of Sales - Condenser Products
Brent is the Director of Sales for Condenser Products at American Exchanger Services. His primary responsibility is to capture condenser sales for the business including new steam surface condensers, field retrofit, condenser parts and other related products involving steam surface condensers. Brent has forty-three years of experience in the heat transfer field primarily for surface condensers, steam jet air ejector systems, and heat exchangers. This includes mechanical and thermal design experience, project management, and sales management. Brent also has extensive supervision experience. In his career, Brent has served previous roles including positions with SPX Heat Transfer as Director of Proposal and Sales Director and Vice President of Sales and Marketing for Alstom and Yuba Heat Transfer. Brent received a Bachelor of Science in Mechanical Engineering from Lafayette College in Easton, PA. Personal interests include family activities, fishing, travel, and riding his motorcycle.
James Frankiewicz
VP Quality
Mr. Frankiewicz began his career with AmX with an internship in the summer of 2007 and joined the team full-time in 2009 after graduating with a BS in Computer Engineering from University of Wisconsin Madison. His initial role was writing the thermal design and optimization software for condensers and feedwater heaters. Mr. Frankiewicz transitioned to a role in production in 2011, to help oversee project management aspects related to a large EPC project as part of a nuclear plant upgrade.
Mr. Frankiewicz has held various roles in production, including project management and document control, project scheduling, quality inspection and interim handling of production management responsibilities working with and supervising in-house and contract machinists, welders, and general laborers. He additionally has hands on experience with a variety of field projects including large main steam condenser re-tubing, replacement heat exchanger removal and installations, and various other onsite repairs, modifications, and consultations – both domestic and overseas.
Jim currently manages the quality program overseeing material purchasing and receipt inspection, in-process inspection and testing, as well as final acceptance testing.
Kenneth E. Yeaman
Operations Manager - Field & Fabrication
Ken joined AmX in 2017 and has over forty years of fabrication management experience, two as Owner/Manager of his own contracting firm, with the balance of his years supervising construction of heat transfer equipment at Hydro Dyne Inc. Ken has extensive experience in manufacturing, quality control and field service experience in Feedwater Heaters, Custom Heat Exchangers, Condensers, Evaporators, Reboilers, Oil Coolers, and Distilling Plants.
Ken has been an integral part of the AmX team, managing Operations both in the field and in the facilities, and in his time with AmX has traveled around the world providing critical service to our global partners. One of those experiences was in Indonesia, where he spent 4 months working on a main steam condenser re-tube.
In the field, Ken’s areas of expertise include Retubing, Rebundling, Mechanical Repair, Plugging, Field Inspection, Failure Analysis, and Removal and Installation of Heat Transfer Equipment. He is a skilled technician schooled in production disciplines and logistics. He has completed courses of study in certified welding and qualifies to the requirements of ASME Code Manufacturing Section I, IV and VIII Division I of the National Board of Boiler and Pressure Vessel Inspectors.
