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 /H
≤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/
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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