No. 99 Yilan Rd., Xiamen , CN.
+86 186 5928 0806

Large Pressure Vessels Fabrication

Openex is a market leader In the custom 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 teams can readily produce large diameter vessels to your exact specifications with sizes of up to 36 feet plus in diameter and weighing as much as 630 tons and more.

Openex also provides a full spectrum heavy fabrication and welding, industrial gearing, kitting, assembly and support for oil and gas.

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Pressure vessels are closed containers used to hold liquids, vapors, and gases at a pressure significantly higher or lower than normal. They are used in a number of industries, some of the most common being petrochemical, oil and gas, chemical, and food processing. The term “pressure vessel” can also be used to describe a number of pieces of equipment, including reactors, flash drums, separators, and heat exchangers. Openex manufactures both custom pressure vessels and large pressure vessels used in a wide variety of applications across the aforementioned industries.

When manufacturing a large pressure vessel, the first thing to consider is material. Which material can meet the strength requirements of a certain application? What about corrosion resistance? Cost-wise, it is also important to consider things like ease of fabrication, maintenance, and availability.

Next comes design and incorporating the customer’s specifications. This includes design pressure, maximum allowable working pressure, design temperature, maximum allowable stress, joint efficiency, and corrosion allowance. A large pressure vessel is fabricated through forging, rolling, and welding metal sheets. Then, auxiliary equipment and accessories are added to ensure the vessel can meet its application.

Lastly, the pressure vessel must be tested to make sure it will be reliable for the customer. This includes visual testing, ultrasonic testing, radiographic testing, magnetic particle testing, liquid penetrant testing, and pressure testing, as well as what Custom does: hydro-testing.

Openex's Fabrication Capability:

Openex’s 730,000 square meters manufacturing facility provides ample space for the fabrication, welding, and machining of each custom pressure vessel. Equipped with oxy-fuel and plasma cutting systems, heavy fabrication equipment, manual and CNC machining centers, and overhead cranes capable of handling up to 450 tons, Custom ensures high-quality production of any sized pressure vessels capable of passing the most strict, non-destructive examination and hydro-testing requirements. 

Contact us at or call us at +86 186 5928 0806 for more information about fabrication for pressure vessels and to receive a free project quote today.


  • Heavy Welding of pressure vessel
    ASME U Stamped Pressure Vessel
    Pressure Vessels Fabrication
  • pressure vessels
    columns and tower
    Radiographic Testing (RT) NDT
  • metal fabrication
    Quality control
    Pressure Vessel Parts before assembly
  • Customers Spot Inspection
    Heat treatment
    assemblied before welding

Our Full-Service Metal Fabrication - metal cutting and sheering, metal forming, bending, and rollingweldingCNC machining, sheet metal assembly, and quality inspection

Machining Services: Multi-Axis Machining, 5-Axis Machining, CNC Milling | Vertical and Horizontal, CNC Turning | Vertical and Horizontal, CNC Engineering, CMM Inspection

Material Types: castings, forgings, fabricated weldments, billets, bar stock, and plate

Metal Materials we worked: Stainless steel, Carbon Steel, aluminum, brass, bronze, chromium, copper, Monel, nickel,  titanium, zinc, and many other superalloys.

Contact us at or call us at +86 186 5928 0806 for more information about fabrication for your industry and to receive a free project quote today.

Certifications: ISO 9001, 14001,18001, CE EN 1090-1, ISO 3834, ABS, AWS, API, ASME, DNV.GL.

Industries Served: Mining,  Construction,  Oil & Gas,  Power Generation,  Marine,  Automotive,  Renewable Energy,  Pulp & Paper,   Bridge,   Aerospace,   Defense,  Printing and Dyeing,  Machinery, etc.

About Openex

Openex is home to a full-service, one-stop-shop, contract manufacturing company producing custom large machined parts and fabrications. Our full large fabrication services including large machining, cutting, welding, rolling, punching, braking, testing, painting, and others.
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