Dry weights for take-off, lifting & support estimating — flanges computed from ASME B16.5 (Classes 150–2500), valves from vendor catalogue data
Flanges. Computed from ASME B16.5 dimensional data — flange OD (O), thickness (tf), hub diameters (X, A) and length-through-hub (Y) — modelled as a bored ring plus hub frustum, multiplied by carbon-steel density (7 850 kg/m³). A per-type calibration factor reconciles the geometry to catalogue values (Class 150 weld-neck verified: 6″ = 9.3 kg, 12″ = 32.9 kg). Weights are derived from dimensional facts, not reproduced from any proprietary weight table.
Coverage. Weld-Neck & Blind: Classes 150–2500. Slip-On: Classes 150–600 (rare above 600#). Raised-face, carbon steel.
Valves. Gate, Globe and Swing-Check weights are from the Fasani (Tyco) bolted-bonnet catalogue, in kg — W1 = flanged body, W2 = welding (butt-weld) body. Note the catalogue's Class 1500 small-bore figures read lower than Class 900 (e.g. 3″ 1500# = 70 kg vs 900# = 130 kg), which appears inconsistent; values are shown as printed — verify those cells against a current vendor sheet.
Use. Indicative for MTO, lifting and support estimating. Actual weights vary with manufacturer, body material, trim and ends. Not a substitute for certified vendor data.