A Lap Joint Flange is a type of flange used in conjunction with a stub end or tailed pipe, designed for applications that require frequent dismantling for inspection or cleaning. It is not welded or permanently attached to the pipe, allowing flexibility and ease of alignment during installation. Below is detailed information on lap joint flange dimensions: Design Features of Lap Joint Flanges Detachable Design: The flange is loose and can rotate around the pipe or fitting. Stub End Required: Used with a stub end to hold the flange in position. Ease of Installation: Alignment is easier since the flange can be rotated after bolting. Applications: Common in systems requiring frequent disassembly (e.g., low-pressure and non-corrosive environments). Dimensions Based on Standards The dimensions for lap joint flanges are standardized under ASME B16.5 (sizes ½” to 24”) and ASME B16.47 (sizes 26” to 60”). Key Dimensions: Outside Diameter (OD): The external size of the flange ring. Flange Thickness (T): Measured from the face to the outer back surface. Hub Diameter: The inside diameter of the hub matches the pipe size. Bolt Circle Diameter (BCD): The circle's diameter passing through bolt holes' center. Bolt Holes: Number and diameter vary with the pressure class. Raised Face or Flat Face: Some lap joint flanges have raised faces for enhanced sealing. Pressure Classes Lap joint flanges come in various pressure ratings to accommodate different piping systems. Typical classes include: Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500 Class 2500 Each class dictates the flange's dimensions, bolt size, and bolt number. Advantages of Lap Joint Flanges Alignment: Simplifies alignment during installation. Cost-Effective: Material savings as the flange does not need to match pipe grade. Reusability: Easily removed and reused. Reduced Stress: Ideal for systems experiencing high vibrations or thermal cycling. Applications Petrochemical Industries Water Treatment Systems Pharmaceutical Pipelines Food Processing Units