Open Access
Table 4
Standard table of gate grade.
| Gate evaluation grade standard | ||||
|---|---|---|---|---|
|
|
||||
| x i: Index | A | B | C | D |
| x 1: Primary component σ/[σ] | ≤0.85 | ≤1.0 | ≤1.05 | >1.05 |
|
x
2: Overload H 实/H 设 |
≤0.85 | ≤1.0 | ≤1.05 | >1.05 |
| x 3: Ice thickness(cm) | ice-free | ≤10 | ≤30 | >30 |
| x 4: Arm stabilityσ/[σ] | ≤0.85 | ≤1.0 | ≤1.05 | >1.05 |
| x 5: Deflection of main beam Δl/l | <0.85/ 600(750) |
<1.0/600 (750) |
<1.05/ 600(750) |
≥1.05/ 600(750) |
| x 6: Vibration strength | No obvious vibration | Local vibration not strong |
Global vibration Local intensity |
Global strong vibration |
| x 7: Gas corrosion | None | slight cavitation | Cavitation damage | Severe cavitation damage |
| x 8: Quality of parts | Health | Minor damage | severe damage | Loss of parts |
| x 9: Sealing performance | completely to satisfy the Requirement | basically to satisfy the Requirement | Close to satisfy the requirements | not satisfy the Requirement |
| x 10: Operating years | ≤5 | ≤15 | ≤30 | >30 |
| x 11: Rusting condition | No corrosion at all | a small amount of corrosion | More corrosion | Severe corrosion |
| x 12: Maintenance | Periodic | Basic Periodic | Unscheduled | none |
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