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ASME Rules 

To be able to fabricate to the ASME Codes or make repairs to the N.B.I.C. (National Board Inspection Code), Sigma Manufacturing must successfully complete an audit/review by The National Board of Boiler and Pressure Vessel  Inspectors. We must also have a qualified W.P.S. (Welding Procedure Specification) supported by a P.Q.R. (Procedure Qualification Record). The work must be performed by a qualified welder documented by a W.P.Q. (Welder Performance Qualification).

Sigma Manufacturing's WPS’s are qualified by each process and by material type. GTAW (Gas Tungsten-Arc Welding), GMAW (Gas Metal-Arc Welding), FCAW (Flux Cored Arc Welding), SAW (Submerged-Arc Welding). All processes must be qualified to ASME Section IX (Welding, Brazing and Fusing Qualifications). Sigma Manufacturing has multiple WPS’s.

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what it means for you

  • Only Certified Manufacturers Can Build Vessels

  • Complete Trace-Ability Raw Materials

  • Design Shall Meet A.S.M.E. Code

  • Pressure Vessel Test Must Be Witnessed By an N.B.I.C. Approved Third Party