Table 11 Different tunnel entrance and exit guide angle corresponding to the stress of four bend (Oil 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 | 411.39 MPa | 327.91 MPa | 327.43 MPa | 326.95 MPa | 326.47 MPa |
Bend 2 | 412.65 MPa | 328.21 MPa | 328.21 MPa | 328.17 MPa | 328.17 MPa |
Bend 3 | 421.69 MPa | 329.77 MPa | 329.77 MPa | 329.77 MPa | 329.77 MPa |
Bend 4 | 358.70 MPa | 329.12 MPa | 327.78 MPa | 326.52 MPa | 325.34 MPa |