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Any vessel carrying pressure in excess of 15 PSI falls under the ASME Code and should be stamped or certified by the ASME. ASME’s Conformity Assessment program is the leading, universally recognized, independent Quality Assurance (QA) program that certifies that manufacturing, power generation, stamped products and parts fulfill the requirements of relevant ASME codes and standards. It certifies that stamped items conform to ASME standards, including the ASME Boiler and Pressure Vessel Code (BPVC), the Bio Processing Equipment (BPE) Standard, and/or Reinforced Thermoset Plastic Corrosion Resistant Equipment (RTP-1) Standard. The result is the ASME Certification Mark, which signifies that the product in question is manufactured from high-quality materials and very safe to use.


An ASME U Vessel Stamp signifies that the vessel was made to the standards stated in Section VIII Division 1 by the American Society of Engineers. This certification is denoted by the ‘U Stamp’ for pressure vessels. Established in 1911, ASME formed necessary regulations to govern and control the manufacturing of pressure vessels & steam boilers to reduce the risk of any mishaps and explosions on factory premises. The U Stamp code on a vessel is used to confirm that the product is in accordance to the updated edition of the code. It also indicates that the pressure vessel has been designed and manufactured as per the ASME regulations. The pressure vessels under ASME U stamp requirements are specifically inspected by a third-party authorized inspector. The inspector must review and approve the calculations as well as witness the ASME hydro test. Such inspectors are commissioned by the National Board of Boiler and Pressure Vessel Inspectors.


A U2 Vessel Stamp means it meets the standards for Section VIII Division 2 Alternative Rules. The ASME U2 stamp is for unfired pressure vessels not built to ASME section 8 div. 1 standards, but under the alternative rules, has been inspected and found to comply with acceptable construction methods. A U-1 form signed by an authorized inspector must be filed for each such vessel, along with a description of the methods of construction used.


Repair or alteration of pressure-containing parts of a container must be performed in compliance with the applicable provisions of the current edition of the National Board Inspection Code (NBIC). Where specific procedures are not given, it is intended that subject to acceptance of the inspector, all repairs or alterations must conform as much as possible to the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC) section and edition to which the container was constructed.R stamps is ASME codes certification Stamp, qualifying organisations for the repair and/or alteration of pressure vessels-in line with ASME boiler and pressure vessel codes (check ASME IX, ASME VIII Div 1).The National Board of Boiler and Pressure Vessel Inspectors offers the R symbol stamp for the alteration and/or repair of pressure vessels, boilers, and other pressure-retaining items after subjecting the organization to an onsite review. Based on the jurisdictional requirements, the inspection may be handled by a member of the National Board or a representative.R Stamp is required for welding repairs done on the pressure vessels and to alter a variety of non-fired pressure vessels and tanks. There is an exhaustive procedure that the company needs to follow in order to qualify and retain the R Stamp certification. This procedure involves the company to demonstrate competence in performing actual repair and the repair procedure for tanks or vessels. The firm that completes any repair to a pressure vessel must hold a valid certificate of authorization to use the copyright-protected repair symbol of the National Board, commonly referred to as an R-stamp. The R-stamp may authorize repairs to be made at the repair firm or a field location, or both.

Universal Engineering Services has more than a decades experience in the pressure vessel design for clients in UAE, Oman, Qatar, Kuwait, Bahrain, Saudi Arabia, and many more countries all over the world. UES work to many ASME standards to design and validate pressure vessels, boiler, fittings and piping systems. We are also experts in Stress analysis of piping, structural design, ASME Joint review, Design of Storage tanks, code calculations, FEA/FEM, and spotless service on design management.

**The content of this article is taken from web open source. The blogs are intended only to give technical knowledge to young engineers. Any engineering calculators, technical equations, and write-ups are only for reference and educational purposes.

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