Stub Ends are pipe fittings used with lap joint flanges to connect pipes. They are commonly used in systems where frequent disconnection is required for inspection or cleaning. Stub Ends are classified into three types: Type A, Type B, and Type C, as per ASME B16.9. Key Dimensional Parameters Outer Diameter (OD): Matches the pipe diameter for a proper fit with the flange. Inside Diameter (ID): Matches the pipe’s inner diameter, ensuring seamless flow. Length (L): Defined as the distance from the flange-facing surface to the pipe end. Short Stub End (Short Pattern): Ideal for compact installations. Long Stub End (Long Pattern): Used where additional pipe length is needed. Lap Diameter (B): Surface diameter that makes contact with the flange. Thickness (T): Matches the pipe schedule for pressure handling. Stub End Types Type A: Designed for standard lap joint flanges. Has a machined face and a radius on the lap to match the flange. Commonly used in high-pressure or critical systems. Type B: Used with standard slip-on flanges. Typically utilized in lighter pressure systems. Type C: Universal type suitable for lap joint or slip-on flanges. Has a straight edge and is often used in low-cost installations. Dimensional Ranges Nominal Pipe Sizes (NPS): Typically range from 1/2" to 24" or larger for custom applications. Wall Thickness (T): Matches pipe schedules (Sch 10, Sch 40, Sch 80, etc.). Length (L): Short pattern stub ends are around 1.5 times the pipe OD, while long pattern stub ends are approximately 2.5 times the pipe OD. Applications Stub Ends are extensively used in: Systems requiring frequent dismantling. Corrosive environments (with material like stainless steel). Food, beverage, and pharmaceutical industries for easy cleaning and maintenance.