Pressure Vessels

Each pressure vessel that we manufacture is per the American Society of Mechanical Engineers (ASME) code. As a leading ASME pressure vessels manufacturer, our specialty lies in working with a variety of alloys, pressures, & designs to meet your custom requirements. More »

Weld Overlay and Clad Vessels

Our weld overlay and clad vessels are fully code-compliant. We use our advanced welding techniques to their full capabilities to offer you the finest overlay/clad components and pressure vessels. More »

High Pressure Vessels

We hold the American Society of Mechanical Engineers (ASME) U, U2, and U3 stamps, and have the capabilities and resources to manufacture ASME high pressure vessel to your exacting specifications. More »

Autoclaves

We hold the American Society of Mechanical Engineers (ASME) U, U2, U3, PP, & S stamps, and have the capabilities and resources to manufacture autoclaves to your exacting specifications. More »

Heat Exchangers

We specialize in the design, engineering, and fabrication of Shell and Tube Heat Exchangers, including thermal calculations. All of our units are built in strict accordance with the latest edition and addenda of the A.S.M.E. Code, Section VIII Division 1, 2, or 3 and T.E.M.A.” More »

 

How to Fabricate a Pressure Vessel

The fabrication of a pressure vessel is a detailed and precise process. Immense care needs to be taken to ensure that the quality of the vessel is excellent, and that the fabrication meets all the requirements of the ASME Boiler and Pressure Vessel Code (BPVC) and global safety standards.

Steps to Fabricate a Pressure Vessels

To help you understand the process easier, the fabrication process has been divided into steps. Before the fabrication process is begun, a few important design steps must be performed. These are given below in brief.

  • List the Design Criteria: This is where all the technical specifications and requirements are taken from the client. The design criteria will include aspects such as the shape of the vessel, and details such as material of construction, length, diameter, internal pressure & temperature, etc.
  • Perform Mechanical Strength Calculations: With pressure vessel design software, the mechanical calculations are performed to determine the required material thicknesses and weld sizes.
  • Generate Fabrication Drawings: Fabrication drawings are produced based on the design criteria and mechanical calculations with software such as AutoCAD. These drawings can be produced in 2D or 3D, but usually 2D will suffice.

Once the design is approved by the client and a third party inspector (A.I.), the fabrication process begins.

  1. Cut The Plate: A large amount of plate is cut into the required width and length for the vessel shells. A specialized cutting torch is used to cut the steel. A variety of torches can be used depending on material and required edge quality. Bevels are usually cut on edges at this time.
  2. Roll the Plate into Cylinders: The plate is rolled into cylinders of required diameter. Usually the plate is rolled cold, but can be done hot in order to use plate rolls of a smaller capacity.
  3. Weld Long Seams of Cylinders: Usually performed with submerged arc welding.
  4. Fit & Weld the Pressure Vessel Cylinders: Usually performed with submerged arc welding. This is only needed if more than one shell is required to meet the required vessel length.
  5. Cut and Form the Pressure Vessel Heads: Various cutting torches can be used to cut the plate for the pressure vessel head. Then the pressure vessel heads are formed using a variety of techniques, usually flanging and spinning or press forming is used.
  6. Fit & Weld Heads to Pressure Vessel Shell: Usually performed with submerged arc welding.
  7. Cut Holes For Nozzles: Holes need to be cut into the steel plate for the required vessel nozzles. This is usually performed with a manual plasma-arc or oxyacetylene cutting torch.Final edge preparationis performed by manual grinding.
  8. Install Nozzles: Nozzles and reinforcement pads are welded in usually using a manual wire welding technique.
  9. Install Required Structural Supports and Lifting Devices: These are usually welded on using a manual wire welding technique.
  10. Final Quality Checks: This could include hydro, pneumatic, radiography, ultrasonic, and or magnetic particle testing to ensure integrity of design, material, and welding.
  11. Final Inspections:This usually includes internal, customer, and third party inspections.

By completing each step carefully, you can fabricate a pressure vessels of great quality.

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