LeKe Piping / Technical calculator
Buttweld pipe cap
weight calculator
Calculate a theoretical cap weight using ASME B16.9 cap dimensions, your nominal wall thickness and selected material. Inspect the matching ellipsoidal cap in 3D.
Set cap dimensions
NPS, outside diameter and cap length follow the LeKe ASME B16.9-2018 Table 6.1-10 reference.
Estimated weight
For one cap and the selected quantity.
Drag freely in any direction. The hollow model follows the selected standard length and wall thickness.
Calculation method
Volume = π(R² − r²) × s + 2π/3 × [R²h − r²(h − t)]. Here R = OD/2, r = R − t, assumed ellipsoidal crown depth h = OD/4, and straight skirt s = E or E₁ − h. Weight (kg) = Volume (mm³) × K / (π × 1000).
ASME B16.9 supplies cap dimensions and requires an ellipsoidal shape; it does not publish one fixed weight for every wall and material. The 2:1 crown and uniform-wall skirt are explicit modeling assumptions. Forming can thicken the crown and change the real profile. Use the production drawing or measured weight for purchase quantities.
Ask us to confirm your order
Send NPS or DN, wall or schedule, material grade, quantity and destination. We can confirm the applicable length, drawing and quoted weight.