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.
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