Hydro Plant Risk Assessment Guide

power supply, inspections, exercising of the system on a regular basis, wrap of rope/chain onto
drums, replacement part availability.
Results are analyzed and applied to Table 5 to arrive at an appropriate Gate Operator (Electric
Hoist) Physical Condition Indicator Score.
Note: Bridge and gantry cranes that are used for emergency closure shall not be inspected or
rated using this section. Bridge and gantry cranes have specific inspection requirements that are
described in applicable Federal, State, Provincial laws and regulations. See the Crane Condition
Assessment Guide, Appendix E9.
Table 5 – Gate Operator (Electric Hoist) Physical Condition
Electric Hoist Condition
Results
Indicator Score
Hoist surfaces and coatings are free of corrosion; no structural damage
or cracks; couplings are tight and properly aligned; moving parts are
lubricated; gearbox oil is free from contaminants and moisture and
tested regularly; no groove wear on drums or sheaves; bearings are
checked for wear and lubrication; oil seals do not leak; gears are
properly aligned and have no wear; the hoist ropes are inspected for
3
broken strands, hoist chain is free of cracked, deformed, or severely
corroded links; the rope/chain is laying properly on the drum; limit
switches are properly set and functioning properly; hoist brakes have no
wear and operate properly; no unusual noises or binding of the
mechanism during operation; electrical components are clean and
function; the hoist system has been tested and exercised regularly.
Hoist surfaces and coatings have minor defects or corrosion; no
structural damage or cracks; couplings are tight and properly aligned.
moving parts are lubricated; gearbox oil is not tested regularly or minor
contaminates noted; no groove wear on drums or sheaves; oil seals do
not leak; gears are properly aligned and have no wear; hoist ropes have
no broken strands or evidence of corrosion; hoist chain has some
2
corrosion but no cracks or deformed links; the rope/chain is laying
properly on the drum; limit switches are properly set and functioning
properly; hoist brake pads have ≥ 50% of the lining left and operate
properly; no unusual noises or binding of the mechanism during
operation; the electrical components are not very clean; the hoist
system has been tested and exercised regularly.
Hoist surfaces and coatings have minor defects or corrosion; minimal
structural damage with no cracks; couplings are tight and properly
aligned; gearbox oil is not tested regularly or minor contaminates or
water is noted; some groove wear on drums or sheaves; oil seals have
1
minor leaks; gears are mis-aligned but no major wear or damage to the
gears; hoist ropes have no broken strands or evidence of corrosion;
hoist chain has moderate corrosion but no cracks or deformed links;
E11-9