American Society of Mechanical Engineers (ASME)

“S” Stamp – BPVC Section I Certification (Power Boilers)

Applicable to boilers in which steam or other vapor is generated at pressures exceeding 15 psig, and high temperature water boilers intended for operation at pressures exceeding 160 psig and/or temperatures exceeding 250 degrees Fahrenheit. Superheaters, economizers and other pressure parts connected directly to the boiler without intervening valves are considered as part of the scope of Section I.

“U” Stamp- BPVC Section VIII (Pressure Vessels) Division I

Provides requirements applicable to the design, fabrication, inspection, testing and certification of pressure vessels operating at either internal or external pressures exceeding 15 psig. Such pressure vessels may be fired or unfired. Specific requirements apply to several classes of material used in pressure vessel construction, and also to fabrication methods such as welding, forging and brazing. It contains mandatory and non-mandatory appendices detailing supplementary design criteria, nondestructive examination and inspection acceptance standards.

 “R” Stamp

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.