CNC Machining of a Hot Water Heat Exchanger

At TruStop Inc., we were contracted by a USA-based customer to develop a heat exchanger system according to their supplied specifications. The final product would need to be capable of holding 150 psi, 7 ft. water heated to 400°F and would follow customer-submitted CAD drawings. By applying high precision manufacturing procedures to ASME-compliant designs, we were able to design and build a custom heat exchanger that exceeded the customer requirements.

We selected a combination of carbon steel and copper-nickel materials for fabrication of the heat exchanger. The design included 6″ and 3″ flanges, rated at 150 lbs. and 300 lbs. respectively, and also incorporated 5/8″ diameter, 0.049″ wall thickness heat exchange tubing. Material manufacture was conducted on-site and included precision CNC machining and assembly procedures. The final product achieved ASME Sec. VIII Div. 1 2010 certification, which establishes that a heat exchanger be able to heat 500 GPM of water from 140°F to 160°F, among other requirements. Construction and delivery were completed within an 8-week turnaround period.

To learn more about this project and TruStop Inc.’s other abilities, see the table below or feel free to contact us directly.

Custom Manufacturing of a Hot Water Heat Exchanger Project Highlights

Product Name

Hot Water Heat Exchanger

Product Description

Custom manufactured & machined single wall, tube and shell hot water heat exchanger.

Capabilities Applied/Processes


  • Manufactured
  • Machined
  • Assembled
Equipment Used to Manufacture Part

CNC Machined

Overall Part Dimensions

Flanges and rating: 6″ 150 lbs. and 3″ 300
Heating Tubes Outer Diameter: 5/8″ Wall Thickness: .049″

Designed Pressure

150psig MAWP at 400°F

Water Velocity

7ft. / sec

Material Used

Carbon Steel

In process testing/inspection performed

ASME inspection/Testing

Industry for Use




Delivery/Turnaround Time

8 Weeks

Delivery Location


Standards Met

Customer Specifications, CAD Drawing
ANSI Standards
ASME CODE, Section VIII Division 1, 2010

  • Heater Will Heat 500 GPM of Water from 140°F to 160°F
  • Total Heat Transfer of 5 million BTU/hr.
  • Heater will use 70 GPM hot water from 360°F to 215°F

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