GB/T 17186.2-2018 in English

Analysis of the core content of the standard

Key Technical Points

1. Leakage Control Model

The elastic-plastic gasket behavior model is adopted to quantify the leakage rate through the effective gasket width b_Ge and the creep coefficient P_ΦQR:

• Gasket stress range: Q_min(L)≤Q≤Q_max
• Iterative algorithm is used to determine b_Ge (Equations 38-41)

2. Mechanical Parameter Calculation

Implementation suggestions

1. Preferably use torque wrench for assembly (Appendix A) to control ε_± dispersion
2. Cyclic load conditions need to verify that Φ_F≤0.8 (Formula 70)
3. Metal gaskets are recommended to have c₁=1/20 (Formula 72a)

Standard evolution analysis

Main improvements of the 2018 version:
1. Add Calculation of internal forces in joints (Chapter 7)
2. Introduce EN13555 gasket test specifications
3. Supplement the metric bolt size table (Appendix G)