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Main parts of steam turbine and its durable and recommended purchasing period

1.Life of main parts of the existing steam turbines depends on operating conditions and circumstances. Deterioration of main parts will affect plant operation seriously since it take nearly one year to manufacture these parts.
2.In order to minimize plant outage, we would strongly recommend to stock necessary main parts as per the following table.
3.Recommended spare parts
Item Durable period Recommended
replacement
timing
Munufacturing lead time
(FOB)
(1)Turbine rotor(Including braid) 20~25 years 15~20 years 8 months
(2)Diaphragm, Nozzle 15~20 years 15~20 years 6 months
(3)Bearing 10~15 years 10 years 6 months
(4)Reduction gear 15~20 years 15 years 6 months
(5)Main stop valve,Governing valve, Casing valve 10~15 years 10 years 5 months
(6)Others 10~15 years 10 years 2~5 months
(1) Turbine rotor(Including braid)

(2) Diaphragm and Nozzle

(3) Bearing

(4) Reduction gear

(5) Main stop valve,Governing valve, Casing valve

(6) Others

4.Others
NO. Item Content Standard consumable period (year) Munufacturing lead time Measures
4-1 Pin for regulation device •Damage and wear measures (6~10) 2 months Preparation and replacement of spare parts
4-2 Reamer bolts & nuts for coupling •Damage and wear measures (15) 2 months Preparation and replacement of spare parts
4-3 Element for pressure control device •Damage and wear measures (15) 4 months Preparation and replacement of spare parts
4-4 Labyrinth packing •Measures of rupture, damage and wear (15) 4 months Preparation and replacement of spare parts
4-5 Pilot piston for regulating device •Damage and wear measures (10) 3 months Preparation and replacement of spare parts
4-6 Bolt & set screw for diaphragm •Deterioration measures of bolt & set screw
Note. Internal in turbine casing
After 60,000~80,000 HRS
(10~15)
2 months Preparation and replacement of spare parts
4-7 Air vent pin for regulating device •Wear of pin & oil leakage measures (10) 1.5 months Preparation and replacement of spare parts
4-8 Taper pin & spring for emergency triping device •Taper pin's wear and deterioration measures (10) 1.5 months Preparation and replacement of spare parts
4-9 Pin & spring for over speed triping device •Measures of wear and corrosion and damage of trip pin
•Measures of wear-out and deterioration of spring
(10) 1.5 months Preparation and replacement of spare parts
4-10 Solenoid valve ass'y for triping device •Coil or valve replacement (10) 2 months Preparation and replacement of spare parts
4-11 Power rotor & idler rotor for screw oil pump •Measures of damage & wear of gear (15) 4 months Preparation and replacement of spare parts
4-12 Display for electronic governor •Display failure 30,000 HRS 2 months Preparation and replacement of spare parts
4-13 Hydraulic amplifier •Damage and wear measures EVERY 2 YEARS or after 16,000 HRS 4 months Preparation and replacement of spare parts
4-14 Electronic governor •Deterioration (10) 5 months Preparation and replacement of spare parts
4-15 Screw & gear for regulation device •Corrosion & wear measures (15)   Preparation and replacement of spare parts
5.Valves
NO. Item Content Standard consumable period (year) Munufacturing lead time Measures
5-1 Valve & bush for main stop valve •Measures of corrosion, wear & damage of gland (15) 4 months Preparation and replacement of spare parts
5-2 Valve, valve spindle & bush for Governing valve •Damage and wear measures (10) 4 months Preparation and replacement of spare parts
5-3 Plate spring for main stop valve •Failure of dimension due to wear-out (4) 1.5 months Preparation and replacement of spare parts
5-4 Guide sleeve for governing valve •Grinding or new manufacturing of piston protection cylinder
•Setting of bush by processing of the middle cylinder crown
(10) 2 months Preparation and replacement of spare parts
5-5 Pin for governing valve feedback link •Damage and wear measures (6~10) 2 months Preparation and replacement of spare parts (Structural modification in part)
5-6 Piston for servomotor •Measures of wear and damage and oil leakage of piston (10) 2 months Preparation and replacement of spare parts
5-7 Strainer & set bolt for main stop valve •Damage measures of strainer
•Measures of damage and printing of bolt
Note 1. Weld repair or replacement of parts of strainer
(10~15) 3 months Repair or preparation for spare parts and replacement
5-8 Spring for main stop valve •Deformation and deterioration measures (15) 2 months Preparation and replacement of spare parts
5-9 Casing bolt nut & washer        
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