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Project Name: Rehabilitation Project of Tiwi and Mak-Ban Geothermal Power Plants

Country: Philippines

Client: National Power Corporation (NPC)

Financial source : Overseas Economic Cooperation Fund(OECF)

Service Period: April 1997 to November 2005

1. PROJECT DESCRIPTION

Units to be rehabilitated are 4 units of 55 MW at Tiwi GPP and 4 units of 55 MW at Mak-Ban GPP. Tiwi and Mak-Ban started the commercial operation in 1979. Both plants heavily deteriorated after 18 years operation and needed to be rehabilitated for reliable operation at the rated output as well as to extend the life of these plants.

With financial assistance of the Overseas Economic Cooperation Fund(OECF) , the project started in April 1997. WEST JEC associated with PGI, the steam developer/supplier for both power plants, had been provided the engineering services.

2. SERVICES

  • Site survey and inspection of plant facilities
  • Preparation of environmental monitoring and pollution control system condition report
  • Finalization of rehabilitation plan and scope
  • Preparation of tender documents
  • Assistance in bidding and contracting
  • Check and review of manufacturersf design and drawings
  • Construction supervision
  • Assistance in the inspection and witness to shop tests
  • Assistance in commissioning
  • Training in power plant design and construction supervision on on-the-job (OJT) basis
3. MAIN TECHNICAL FEATURES
Tiwi
@ Units 1 and 2 Units 5 and 6
Capacity (gross, original) 55 MW x 4 units
(after rehabilitation) 60 MW x 2 units 57 MW x 2 units
@Turbine/Condenser
Manufacturer TOSHIBA, Japan
Type Single cylinder, double flow, impulse, condensing
Steam Pressure at MSV 7.86 ata
Generator @ @
Manufacturer TOSHIBA, Japan
Capacity 69 MVA
Voltage 13.8 kV
Frequency 60 Hz
Power factor 0.87 0.83
@Noncondensable Gas Removal System
Type 2 stage ejector and ejector/vacuum pump hybrid system
Gas content design value 2.8 wt%
Cooling Tower @ @
Manufacturer Marley Cooling Tower, USA
Type Induced draft, double cross flow, wooden

New Turbine Rotor for Tiwi Unit-2

Mak-Ban

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Units 1 and 2 Units 3 and 4
@Capacity (gross, original) 55 MW x 4 units
@(after rehabilitation) 63.2 MW x 4 units
@Turbine/Condenser
@Manufacturer Mitsubishi Heavy Industries Ltd. (MHI), Japan
@Type Single cylinder, double flow, impulse and reaction, condensing
@Steam Pressure at MSV 8 ata
@Generator
@Manufacturer Mitsubishi Electiric (MELCO), Japan
@Capacity 68.75 MVA
@Voltage 13.8 kV
@Frequency 60 Hz
@Power factor 0.919 0.83
@Noncondensable Gas Removal System
@Type 2 stage ejector system
@Gas content design value 1.0 wt%
@Cooling Tower
@Manufacturer MARLEY
@Type Induced draft, double cross flow

Mak-Ban Units 5 & 6 before rehabilitation

Mak-Ban Unit 2 Cooling Tower after rehabilitation

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