Parameters
Design pressure P5.0 MPa
Gasket mean diameter G150.0 mm
Gasket width N12.0 mm
Gasket type
Gasket factor m3.00
Seating stress y69 MPa
Number of bolts n8
Bolt nominal diameter d20.0 mm
Bolt yield strength Sy660 MPa
Bolt utilisation70 %
ASME Design Equations
Gasket seating: $W_{m2} = \pi b G y$
Operating: $W_{m1} = \dfrac{\pi G^2 P}{4} + 2\pi b G m P$
Required bolt load: $W_{req} = \max(W_{m1}, W_{m2})$
0 kN
Operating W_m1
0 kN
Seating W_m2
0 MPa
Bolt Stress
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Leakage Check
Bolt Load Comparison (Seating vs Operating)
Bolt Count vs Bolt Stress & Safety Factor
Effective Gasket Width & Leakage
Basic gasket width: $b_0 = N/2$
Effective width: $b = b_0$ if $b_0 \leq 6.3$ mm, else $b = 2.53\sqrt{b_0}$ (mm)
Leakage margin: $\eta = \dfrac{W_{bolt} - H}{\pi G N \cdot mP} \geq 1$
Hydrostatic end force: $H = \dfrac{\pi G^2 P}{4}$
Engineering note: ASME Class 150–2500 ratings vary with diameter and temperature. Bolt material ASME SA-193 B7 Sy = 660 MPa is standard. Tightening torque T = K × d × F_b, K ≈ 0.15–0.20. At elevated temperature, account for gasket creep relaxation and retorque schedule.