Page 21 - LAPORAN OPTIMALISASI SISTEM GOVERNOR

3. Preparation for works
4. Over speed test before shutdown

I.2.2 Overhaul Governor (Need Governor Woodward specialist M/E) & Main Stop Valve
1. Inspection (audit) & Repair problem governor stroke/travel include check all equipment
governor woodward (mechanical & electrical)
2. Function check instrument control (Woodward 505) & configuration
3. Actuator, Governor, MSV
Governor
- Perform remove tubing & piping (oil system)
- Perform check all electricity & instrument
- Perform dismantle unit Governor
- Perform visual and clearance check, inspection, NDT, contact check (Audit
performance governor)
- Perform chemical cleaning
- Perform calibration governor and all system
- Perform repair passing problem at governor valve stroke
- Perform Setting governor valve stroke by woodward 505 controller
- Perform & setting Governor valve disc (Steam Chest)
- adjust centering of governor
- Perform assembly unit (mechanical & Electrical/Instrument)
Main Stop Valve (MSV)
- Perform remove tubing & piping (oil system)
- Perform dismantle unit MSV
- Perform visual and mechanical inspection, NDT
- Perform cleaning and Adjustment
- Perform assembly unit

I.2.3 Commissioning and Start Up
1. Pre-start
2. Stroke governor & function check
3. Start up, Overspeed test (M/E trip), Synchronize, Load test (up to 100 % load), Load
Rejection and running with load (48 hour) with data sheet commissioning.

I.2.4 Fokus Perbaikan
Selain lingkup pekerjaan tersebut, PT. Sumber Alam Sekurau juga menyampaikan beberapa
permasalahan unit yang dijadikan sebagai fokus perbaikan oleh PT. Energi Berkah Mitratama.
Adapun beberapa fokus perbaikan tersebut adalah sebagai berikut.
1. Butuh pressure tinggi untuk menggerakkan turbin (steam flow tidak bisa naik) dan travel
governor 100% (Woodward 505) namun beban tidak dapat maksimal 7,5 MW;
2. Respon Governor dan Travel Governor lambat pada saat beban lepas sehinggah sering terjadi
over speed saat terjadi kehilangan beban diatas 3 MW (load rejection) sehingga terjadi Black
Out;
3. Maintenance Main Stop Valve (MSV) / respon MSV saat terjadi Black out.

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