The ASME B16.47 Series A Class 150 Weld Neck Flange is the industry standard for large-diameter piping (NPS 26–60). Formerly MSS SP-44, Series A is characterized by a thicker flange profile and larger bolt diameters compared to Series B, providing superior resistance to external loading. These flanges feature a tapered hub for butt-welding, ensuring smooth flow and reduced stress concentration in high-capacity pipelines, refineries, and water treatment facilities.
Technical Attributes: Class 150 Series A (NPS 26–60)
Primary Standard,ASME B16.47 Series A
Former Standard,MSS SP-44
Size Range,NPS 26 through NPS 60
Pressure Rating,Class 150 (approx. 285 psi at ambient)
Main Types,Weld Neck (WN) and Blind
Face Type,"Raised Face (RF) 0.06"" standard"
Common Materials,"ASTM A105, A694, A350, A182"
Construction,Forged Steel
Weld Prep,Beveled for Butt-welding
Series Comparison,Thicker and heavier than Series B
Gasket Compatibility,Spiral Wound (ASME B16.20)
Drilling Template,Circular Bolt Pattern
Finish,125–250 Ra (AARH) standard
Coating Options,"Yellow Primer, FBE, or Galvanized"
Typical Industry,"Oil, Gas, & Water Infrastructure"
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