Air Separation Column Box

Herr & Sacco Inc. is a customer-focused mechanical contracting organization offering services from metal fabrication to process piping and rigging. The project highlighted here was a structural frame designed for use in the air separation industry that required both stainless steel and aluminum welding. With an ability to provide high purity welding within confined spaces, Herr & Sacco fabricated the structural frame and enclosed it in steel plates, as well as filled it with heat exchangers, vessels, separators, and miles of aluminum pipe. The complex project was completed with the use of a plate shear, plate roll; marvel saw, MIG welders, and 20-ton bridge cranes. The product was composed of a carbon steel and stainless steel structure with aluminum pipe. It featured dimensions of 12.5" long, 14" wide, 100’ in height, and with a tightest tolerance of ±0.003". Dimensional integrity was confirmed with the use of dye penetrant, high pressure testing, and radiographs. The project represents a run of one piece delivered in ten months.

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Air Separation Column Box Project Highlights

Product Name
Product Description
A Structural Frame enclosed in steel plates; filled with heat exchangers, vessels, separators and miles of aluminum pipe
Capabilities Applied/Processes
  • Stainless Steel Welding
  • Aluminum Welding
Equipment Used to Manufacture Part
MIG Welders, Plate Shear, Plate Roll, Marvel Saw, (2) 20 Ton Bridge Cranes
Overall Part Dimensions
Height: 100’
Width: 14"
Length: 12.5"
Tightest Tolerances
Material Used
  • Carbon Steel Structure
  • Stainless Steel Structure
  • Aluminum Pipe
In process testing/inspection performed
Dye Penetrant, Radiographs, High Pressure Testing
Industry for Use
Air Separation
Delivery/Turnaround Time
10 Months
Delivery Location
Clarksville, Tennessee
Standards Met
Customer Specifications
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