LeKe Piping / Technical calculator
Weld neck flange
weight calculator
Select NPS, pressure class and neck end pipe schedule. The drawing and dimensions update automatically to estimate the weight of one raised-face flange.
Configure your flange
ASME B16.5 reference dimensions · Sch. 40 default bore
Raised face height for Class 150: 1.6 mm. It changes with the pressure class.
Interactive 3D product model
Drag to rotate · scroll to zoom · model updates with your selections
Drag freely in any direction. 3D geometry is an estimate, not a manufacturing drawing.
Auto-filled dimensions (mm unless noted)
How the estimate is calculated
Volume of the bored plate ring, less bolt holes, plus a tapered hollow hub and raised face, multiplied by the selected density. The hub is simplified as a conical frustum; fillets, chamfers, machining allowances and manufacturing tolerances are excluded.
Source and quotation check
Flange O.D., minimum plate thickness, hub base diameter, length through hub and bolt pattern follow ASME B16.5-2003 Tables 7/8, 10/11 and 15/16. The bore follows the supplied weld neck flange I.D. schedule PDF. Hub fillets, weld-end land and chamfers are visual approximations informed by product photos, not controlled B16.5 table dimensions. ASME B16.5-2003 §6.4.1 describes approximately 2 mm (0.06 in.) raised face for Classes 150/300 and 7 mm (0.25 in.) for Class 600; the calculation uses the drawing convention 1.6 mm and 6.4 mm.