Page 398 - Improving Machinery Reliability

362 Improving Machinery Reliability
Table 9-1
Principal Component Failures Experienced by
Major Machinery and Recommended Spare Parts
Machinery and Component Frequency SIU Spares Post SIU Spares

Gear-speed increasers
Bearings 3 full set full set
Bull gear 2 full spare full spare
Pinion 2 full spare full spare
Coupling 2 1 spare 1 spare
Oil seals 1 1 set 1 set
Reciprocating compressors
Crankshaft 1 - -
Cylinders, liners 2 i set 1 set
Piston rods 2 partial partial
Valves 5 2 sets 1 set
Crosshead guides 3 1 set 1 set
Cross heads 2 - -
Crankshaft bearings 2 1 set 1 set
Connecting rods 1 - -
Connecting-rod bearings 1 1 set 1 set
Lubricators 2 1 unit -
1 unit
Pistons 2 -
Piston rings 2 1 set partial set
Centrifugal compressors
Bearings (journal) 4 1 full set 1 full set
Rotors (shaftslimpellers) 3 spare rotor spare rotor
Labyrinth packing 3 1 full set 1 full set
Bearings (thrust) 2 disc and pads pads
Couplings 2 full spare full spare
Seals 5 1 full, 1 wear 1 wear part set
part set
Steam turbines
Gland packing 4 full set full set
Interstage packing 4 full set full set
Bearings 4 full set full set
Rotors 3 full spare full spare
Nozzles 2 partial set partial set
Diaphragms 2 - -
Admission valves 2 packing 2 sets packing 1 set
Governor 3 full spare full spare
Hydraulic actuator 2 rebuild kit rebuild kit
Governor drive gear 4 full spare. full spare
Turning gear 1 - -
Nozzle-ring bolting 2 full set full set
Trip throttle valve I intemals internals
Electric motors
Bearings 3 1 set 1 set
Oil seals 2 1 set 1 set
Stator 3 1 unit 1 unit
Rotor 1 - -
Fan 2 1 unit I unit
Gas turbines
Combustors 3 full set full set
Compressor rotor 2 full rotor full rotor