ASME Pressure Vessel Fabrication: Design, Materials, and Engineering Expertise

Designing and building pressure vessels requires specialized engineering skills, careful attention to safety codes, and experience with advanced materials. Alloy Engineering provides all of this with our ASME-certified pressure vessel fabrication services. 

Operating from our Berea, Ohio facility, we serve clients across the U.S. in chemical processing, oil and gas, power generation, pharmaceutical manufacturing, and food and beverage production. 

ASME-Certified Pressure Vessel Manufacturing

Alloy Engineering is certified by the American Society of Mechanical Engineers (ASME) to design and build pressure vessels and related equipment. These certifications prove we meet the strict standards required for safe pressure vessel construction. 

Alloy Engineering holds the following certifications:

• U Stamp (ASME) – Authorizes the design and fabrication of boilers and pressure vessels. Every U Stamp vessel we fabricate is code-compliant and registered with the National Board of Boiler and Pressure Vessel Inspectors. 
• S Stamp (ASME) – Certifies the design and fabrication of power boilers. 
• R Stamp (National Board of Boiler and Pressure Vessel Inspectors) – Permits Alloy Engineering to perform repairs and alterations on existing pressure vessels. 

We also employ AWS-CWI and AWS-SCWI certified welding inspectors and ASNT SNT TC-1A Level II certified NDE inspectors. Hartford Steam Boiler serves as our Authorized Inspection Agency. With these certifications, we work on a wide range of equipment:

Types of Pressure Vessels and Equipment We Fabricate

• Pressure vessels (fired and unfired) 
• Heat exchangers  
• Reactors and process vessels 
• Storage tanks and condensate tanks 
• Power boilers 
• Economizers and separators 
• Pressure piping (ASME B31.1 and B31.3) 

Designing Pressure Vessels for Corrosion and High Heat

Many pressure vessels run in places where corrosion, high temperatures, and harsh chemicals are constant challenges. Our team works closely with clients to ensure each vessel is designed for its specific purpose. 

Choosing the right materials is essential for long-term performance. With years of experience using stainless steels and nickel-based alloys, our engineers can recommend alternative materials based on what has worked in previous projects. 

Common alloy grades we work with include 304 and 316 stainless steel, Alloy 625, Alloy 825, Hastelloy C-276, and Inconel 600, selected based on operating temperature, process fluid, and required corrosion resistance. These recommendations can help improve durability, corrosion resistance, and service life. 

Our high-nickel alloy fabrication capabilities support the full range of specialty material combinations your application may require. We maintain approximately 500 Welding Procedure Specifications (WPSs) to support the wide range of materials used in our fabrication work, which is one of the broadest WPS libraries in the region for custom alloy pressure vessel work. 

Comprehensive Inspection and Testing Processes

High-quality fabrication is vital for the safety and reliability of pressure vessels. To make sure every vessel meets ASME standards and customer requirements, Alloy Engineering uses a thorough inspection and testing process.  

All welds receive a visual inspection (VT) before leaving the facility. Most welds are also checked with dye penetrant testing (PT) before shipping. Depending on the project and code requirements, other non-destructive tests may include: 

• Ultrasonic testing (UT) 
• Radiographic testing (RT) 
• Magnetic particle inspection (MT) 
• Helium leak testing (performed in-house) 

All NDE procedures are written per ASME Section V. Quality personnel are qualified per ASNT SNT TC-1A. These inspection methods assess weld quality and ensure each vessel meets the strict safety and compliance standards for pressure equipment. 

Partnering with Clients for Innovative Results

Our experienced team works closely with clients to develop practical, code-compliant solutions. Using design software such as PV Elite and Compress, engineers model pressure vessels and heat exchangers to verify performance and compliance.  

For complex parts, our team may use Finite Element Analysis (FEA) to evaluate stresses. We also use SolidWorks 3D to develop and validate designs without generating unnecessary prototypes, reducing cost and lead time. Specialized partners provide HTRI calculations to optimize heat exchanger performance. 

Industries We Serve 

Alloy Engineering fabricates ASME pressure vessels for demanding industrial applications across multiple sectors: 

• Chemical processing — corrosion-resistant vessels for aggressive process fluids 
• Oil and gas — vessels meeting API specifications for extraction and refinery service 
• Power generation — power boilers, economizers, and heat recovery equipment 
• Pharmaceutical and food processing — sanitary-grade vessels meeting purity and sterility requirements 
• Plastics and polymer manufacturing — high-pressure reactor vessels 

Get Started on Your Next Pressure Vessel Project

With decades of experience creating complex alloy equipment, Alloy Engineering combines ASME-certified manufacturing, advanced engineering analysis, and strong material knowledge to deliver pressure vessels for demanding industrial jobs. Contact the Alloy Engineering team to discuss your next project.