• Large Diameter ASME Pressure Vessel Fabrication Services -11

    Large Diameter, Heavy Wall
    ASME Vessel Fabrication




TransTech is a market leader In the custom design and fabrication of large diameter, heavy wall, super capacity ASME code certified pressure vessels, serving clients in chemical, petrochemical, oil and gas, refining, and a wide variety of manufacturing industries.

Our expert design and fabrication teams can readily produce large diameter vessels to your exact specifications with sizes of up to 20 feet plus in diameter and weighing as much as 650,000 pounds and more.

We offer large diameter vessels for both aboveground and underground applications—delivered to the shortest lead times you'll find.  


With over five decades of experience preparing and executing heavy haul loads exceeding standard dimensions and weights, the TransTech Energy team is uniquely qualified to offer expert support across every stage of your project—including all aspects of delivery - from heavy haul and custom transport logistics including over road, inland barge and ocean vessel freight.

Our comprehensive services simplify the acquisition process across every aspect of your projectone point of contact, one invoicefrom design and engineering to manufacturing, fabrication, assembly, construction, inspection and test, logistics, installation, commissioning and startup.


  • Designed & manufactured to your exact specifications
  • Vessel sizes in excess of 20 feet in diameter and more than 650,000 pounds
  • ASME “U” Stamp, Division 1, 2, and 3, and NBIC “R” Certificate 
  • Atmospheric, Low and high pressure designs
  • Above ground and underground options
  • Horizontal and vertical designs
  • Lethal service 
  • Ultrasonic & Radiography 
  • PMI - Positive Material Identification  
  • Pickling and Passivation (Citric, Nitric and Phosphoric Acid)
  • Heat treatment & Stress relieving
  • In-house insulating with stainless, aluminum and fiberglass skin 
  • Jackets (Half-Pipe, Dimpled, Conventional)
  • Internal Pipe Coils 
  • Standard & custom nozzle configurations
  • Instruments & controls
  • Gauges
  • Piping & drains
  • Built-in lift lugs
  • Custom Manways
  • Custom platforms, ladders, safety cages
  • Short lead times 
  • Heavy Hauling & Delivery 


  • Compress – Pressure Vessel Mechanical Design Software 
  • AutoCAD Mechanical 


  • Stainless Steel
  • Carbon Steel
  • Nickel Alloy
  • Duplex 


We bring state-of-the-art manufacturing processes and tools to every project we deliver.  Our multiple, geographically diverse locationstotaling over 250,000 square feet of fabrication facility spacegive you access to one the largest, most advanced pressure vessel manufacturing resources in the United States.

Every vessel we produce is fabricated to the highest standards to provide you with unmatched quality and safe, reliable performance.  And all vessels are guaranteed to meet all API or ASME Division 1, 2, and 3, Section VIII standards.


Contact us today to speak with one of our large diameter API & ASME pressure vessel fabrication experts about your high capacity storage or processing needs.   

Our team of specialists can work with you to help determine the best solution for your application:(+1) 888.206.4563 —or click to contact us below:

Contact Us



Heat Exchangers, Reactors, Columns & Towers, API Storage Tanks, Pressure Vessels - Preliminary Project Development Project- TRANSTECH

FREE Preliminary Project Development Package

Receive a complete TransTech project proposal, including:

  • Complete sample project budget
  • Complimentary concept evaluation
  • Lead time evaluation
  • Cost analysis
  • More...
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