Pressure Vessel Fabrication and the ASME Stamp

The American Society of Mechanical Engineers (ASME) issues rigorous standards for constructing pressure vessels, which are stamped with codes that certify their compliance with ASME guidelines. All vessels designed to contain pressure that exceeds 15 pounds per square inch (PSI) should feature ASME certification and carry an appropriate stamp. The stamp signifies the product in question is built using the requisite materials and welding technologies that make it safe to use. While the ASME pressure vessel stamps are not legally required, many contracts and purchase orders between customers and manufacturers do stipulate them.  

U-Stamp Certification 

ASME has issued several different certification codes for different types of vessels. For example, the U-stamp (signifying an “unfired” vessel) is used on heat exchangers. A manufacturer that has attained U-stamp certification meets the appropriate ASME quality control standards and can design, fabricate, inspect, or test these unfired pressure vessels.  

Alloy Engineering is qualified to use the ASME pressure vessel stamp on vessels it has fabricated. We can thus develop the welding procedures needed to manufacture the products our customers demand to the quality levels they expect. We can fabricate an ASME U-stamp pressure vessel required by any industry, from pharmaceuticals to plastics to chemicals, oil & gas, or food & beverages. Likewise, we are certified to fabricate S-stamp power boilers. 

Certified to Fabricate Pipes & Pipelines 

Alloy Engineering is also certified to fabricate pipes and pipelines to the ASME B31 standard and is certified to meet American Petroleum Institute (API) specifications and standards for the oil and gas industry. Consequently, we can manufacture pressure vessels using a wide selection of materials such as high nickel alloys and all grades of stainless steel.  

Another quality standard and certification Alloy Engineering adheres to is the NBIC R-stamp issued by the National Board of Boiler and Pressure Vessel Inspectors, which indicates we meet the requirements for repairing and or modifying boilers and pressure vessels. 

Welding & Welding Inspector Standards 

Our highly capable welders are qualified to meet ASME Section IX and AWS D1.1 standards, and our welding inspectors are certified to inspect pressure vessels and other components. We can perform an array of tests in-house, including visual helium leak tests.  

To learn more about Alloy Engineering’s capabilities and to discover more about the ASME Pressure Vessel Stamp, call (440) 243-6800 or contact us.