Table 10 Different tunnel entrance and exit guide angle corresponding to the stress of four bend (Gas pipeline)
From: Stress analysis of parallel oil and gas steel pipelines in inclined tunnels
Location | No entrance and exit guides | Guide angle = 15° | Guide angle = 30° | Guide angle = 45° | Guide angle = 60° |
|---|---|---|---|---|---|
Bend 1 | 358.92 MPa | 358.62 MPa | 351.91 MPa | 343.62 MPa | 334.83 MPa |
Bend 2 | 362.24 MPa | 362.19 MPa | 361.74 MPa | 361.15 MPa | 360.55 MPa |
Bend 3 | 358.76 MPa | 358.76 MPa | 358.47 MPa | 358.12 MPa | 357.77 MPa |
Bend 4 | 356.13 MPa | 354.35 MPa | 342.23 MPa | 327.34 MPa | 312.00 MPa |