Auctions & Liquidations
Private Treaty Sale | DAIO Paper Japan | Steam Turbine GenSet
Listing 3130001:No. 15 Steam Turbine Generator Set (SD 15G)
DATA SHEET AVAILABLE FOR DOWNLOAD HERE
For sale by private treaty: the No. 15 steam turbine generator set at Daio Paper Corporation's Mishima Mill, Japan – Shin Nippon Machinery turbine C11-R16-EX, 62,920 kW, and MEIDEN generator TIC-AFT, 69,912 kVA, built 2019.
Tax Rate on Hammer Price: 10%
Description
1. Scope and site
| Item | Data |
| Owner / site | Daio Paper Corporation (大王製紙株式会社), Mishima Mill |
| Unit | No. 15 steam turbine generator set (15号機) |
| Scope of sale | Steam turbine and generator; associated accessories can be included on request |
| Not included | Boiler |
| Steam parameters (owner's data) | 8.6 MPa / 512 °C / 236 t/h |
| Rated output | Turbine 62,920 kW; Generator 69,912 kVA |
| Delivery year of the generating equipment | 2020 (per MEIDEN maintenance plan for the generator control panel) |
2. Steam turbine
| Item | Data |
| Manufacturer | Shin Nippon Machinery Co., Ltd. (新日本造機株式会社) |
| Type | C11-R16-EX, multi-stage (16 stages) |
| Main unit serial no. | DIOSM-3A-11893 |
| Rated output | 62,920 kW |
| Steam parameters (owner's data) | 8.6 MPa / 512 °C / 236 t/h |
| Exhaust | To condenser |
| Main steam stop valve | Emergency trip valve (MSV) |
| Governing valve | HP steam control valve, venturi type, 5 valves, servo-motor actuated |
| Turbine–generator coupling | Diaphragm coupling; face-to-face distance 550 mm (design +0.2/+0.5 mm; measured 550.32 mm, June 2024) |
| Turning device | Fitted |
| Lube oil system | Main oil pumps No. 1 and No. 2, type HG-65MT (motor driven); emergency oil pump type NHG-10 (motor driven); control oil pumps No. 1 and No. 2 (No. 2 motor driven) |
| Protection | Manual trip cock; remote trip device incl. solenoid valve |
| Bearing clearances (May 2024) | Journal 0.48 / 0.47 mm (management value 0.34–0.48); thrust 0.71 mm (management value 0.58–0.74) |
3. Generator
| Item | Data |
| Make | MEIDEN – OEM reports by Meiden Engineering Corporation; generator control panel manufactured by Meidensha (明電舎) |
| Type | TIC-AFT |
| Rated capacity | 69,912 kVA |
| Voltage / frequency | 11,000 V / 60 Hz |
| Poles / speed | 2-pole / 3,600 min⁻¹ |
| Serial no. | 4B6490R1 |
| Year of manufacture | 2019 |
| Excitation | AC exciter with rotating rectifier and PMG (permanent magnet generator) |
| Cooling | Air cooler with water-cooled tubes; flange gaskets 10K-150A-t2 (replaced 2024) |
| Bearings | Bearing metal with labyrinth seals, oil lubricated; bearing box at negative pressure in operation |
| Shaft voltage (18 Sept 2025) | 900 mV AC, NDE bearing to ground, at 11,000 V no-load – judged good |
| Generator control panel | Meidensha, S/N 2A7149PB, built 2019, installed in the electrical room; AVR, digital protection relays, transducers, sequencer |
| Insulation resistance (13 Sept 2025) | Stator 200 MΩ (1,000 V megger; criterion ≥ 10 MΩ); main field, rotating rectifier, exciter armature, exciter field and PMG ≥ 1,000 MΩ (500 V megger) |
4. Inspection and maintenance history (newest first)
| Period | Work | Contractor / document | Result |
| 11–13 Sept 2025, test run 18 Sept 2025 | Unscheduled generator internal cleaning (report title “突発 SD”): oil accumulation removed inside generator, exciter and PMG; oil leak outside the air cooler cleaned; insulation resistance, vibration, temperature rise, bearing box pressure, shaft voltage; load test to 56.44 MW | Meiden Engineering, report 0-220R25244 | No abnormality found that would lead to an oil leak; load test judged good; periodic cleaning recommended |
| 16–17 May 2024, start-up 12 June 2024 | First periodic inspection of generator control panel / AVR: switchboard inspection, protection relay tests, insulation resistance, interlock tests, AVR static, no-load and load checks | Meiden Engineering, report 0-250R24109 | No abnormalities |
| 15–23 May 2024 | Generator disassembly and detailed inspection with rotor withdrawn; insulation diagnosis; air cooler inspection (eddy current test, 30-min hydrostatic test, gaskets replaced); test run incl. ozone measurement | Meiden Engineering, report 0-220R24216 + photo album | No abnormalities; insulation judged sufficient for operation |
| 8 May – 12 June 2024 (36 days) | Turbine periodic overhaul: casing opened; rotor, nozzles, bearings, valves inspected; clearance and alignment records; oil pumps serviced; safety and operation tests | Shin Nippon Machinery, job DIOSM-6M-82040, report dated 17 June 2024 | All inspected items judged ○ (pass); repairs and OEM recommendations in section 5 |
5. Turbine overhaul 2024 – findings, repairs, OEM recommendations
• Slight erosion (length 10 mm) at the tips of the last-stage (16th) blades – to be monitored over time.
• Erosion at upper- and lower-half nozzles, stages 12, 13 and 14 – weld-repaired and hand-finished by the customer; to be monitored over time.
• Labyrinth and rotor fin damage at clearance-table positions C, D, E, F – hand-finished; rotor fin wear exceeds the management value, so the OEM recommends replacing the rotor fins together with the labyrinths.
• Governing valve: crack in the weld of the 1st valve seat, weld-repaired by the customer (PT good); gland packing replaced.
• Main steam stop valve: sub-valve cover could not be loosened and was not disassembled – OEM recommends servicing at the Kure works (呉工場) next time; damage to the valve cover and sub-valve bush hand-finished, replacement recommended next time; hydraulic relay and oil cylinder not disassembled this time, disassembly recommended next time.
• Servo motor not serviced this time; OEM recommends manufacturer servicing next time.
• 16 main steam flange bolts and 3 coupling spacer reamer bolts replaced; turbine–generator alignment adjusted.
• Main oil pumps No. 1/No. 2 and emergency oil pump serviced under the pump manufacturer's guidance (measurements, coupling, pump–motor alignment, motor and operation checked); control oil pump No. 2 replaced by a new unit, one unit serviced and kept as spare.
• Turning device initial torque changed from 10 % to 20 %.
• Recommended spare parts list for the next overhaul (MSV parts, governing valve packings, carbon brushes) included in the report.
6. Generator test data
Load test, 18 Sept 2025: 56.44 MW, 11,020 V, 2,999 A, power factor 98.40 %, exciter field 34.0 V / 7.2 A; stator winding U/V/W 62.6 / 63.8 / 63.0 °C; bearings DE 61.1 °C, NDE 63.4 °C; lube oil 46.6 °C at 102.1 kPa; cooling water in/out 29.8 / 32.0 °C. Criteria: stator temperature rise ≤ 100 K, bearing temperature ≤ 80 °C – judged good.
Vibration at 56,800 kW: bearings max. 8.3 µm p-p, casings max. 11.2 µm p-p (criterion for bearing pedestals ≤ 40 µm); shaft max. 36/50 µm p-p X/Y at DE (criterion ≤ 100 µm).
Insulation diagnosis, May 2024: stator insulation resistance U/V/W 28,860 / 31,250 / 31,250 MΩ (1-min values, DC 1 kV applied for 10 min), polarisation index 7.00 / 5.93 / 6.28; rotor 100 MΩ (DC 0.5 kV); tan δ0 at 2 kV 1.36 / 1.15 / 1.10 %; partial discharge Qmax 2,400 / 3,000 / 2,500 pC – all within the criteria.
7. Documentation available (in Japanese)
• Shin Nippon Machinery working report, turbine periodic inspection and maintenance, dated 17 June 2024 (checklists, clearance tables, bearing and alignment records, photos, spare parts list)
• Meiden Engineering report 0-220R24216, generator disassembly/assembly and detailed inspection, June 2024, plus photo album
• Meiden Engineering report 0-250R24109, generator control panel / AVR inspection, maintenance and repair, June 2024
• Meiden Engineering report 0-220R25244, unscheduled generator internal cleaning (“突発 SD”), September 2025
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