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(2) 125MW (250MW) Siemens W701WS Gas Turbine GenSets,
rebuilt & unused since, 50Hz, can also use HFO, Re:26323

26323

INTRODUCTION:
1.) There are two (2) Siemens Westinghouse W701 DS gas turbine generator sets for sale: the upgraded version of W501D models, which were manufactured by Fiat who designed them as TG50D5 under licence to Westinghouse (presently a Siemens Company).
Brief History
The W501D models of gas turbines were owned, installed and operated by an European utility company at a former Power Station for three (3) years before they were dismantled as a result of the company’s decision to increase the plant capacity. At which point, the two (2) W501D units were sold to the present owner who had them upgraded by Siemens to W701DS models with 127.8 MW nominal capacity each. Siemens also fully overhauled the units to zero hours.
These units are now for sale.
The 701DS technology is one of the most widespread middle size engines (100-140MW) for power generation that can also operate on Heavy Fuel Oil (HFO).

2.) EQUIPMENT TECHNICAL PRESENTATION
The nominal net site output of each unit is 127.8 MW at ISO conditions, with 32% efficiency in open cycle and up to 52% efficiency in combined cycle.
The turbines have dual fuel capability on natural gas and distillate oil (also heavy fuel oil, following pre-treatment) and are equipped with hot stacks (by-pass) when used for simple cycle operation.

Each unit is located in a separate enclosure and is equipped with its own inlet filtration system, anti-icing system and water injection for NOx abatement.
An optional plant insurance and warranty period through an Operation and Maintenance contract, which will not exceed the calendar date in which one of the following events will first occur:
8,000 equivalent hours;
12 months from the GT first firing.

A Power Plant rebuilder was contracted to conduct a major overhaul of both generator assemblies including stator and rotor overhauls. Also upgraded were both gas turbine longitudinal sections to 127.8MW, 50Hz according to the OEM technical specification. The overhaul and upgrade results as well as the aftermath performance test results are available upon request subject to purchase.

The standard overhaul warranty conditions is:
Net Power Output of 127,800 kW;
Heat Rate of 2,664 kCal/kWh

The upgrading warranty guarantees:
Power increase of 4.2% from original ISO output;
Heat Rate improvement of 0.6% from original ISO output;
Exhaust Temperature increase of 12°C from original ISO output.
All figures make reference to ISO conditions, base load, dry natural gas, open cycle and with GT auxiliaries only.

The gas turbines were inspected by two independent verification authorities. In addition, a visual inspection was performed by Lloyds Register.
Inspection reports, as well as maintenance history, performance upgrade results and supported warranties can be made available upon request.

  1. POTENTIAL USE OF 701DS TECHNOLOGY
    The 701DS technology is one of the most widespread middle size engines (100-140MW) for power generation and the only engine of its size that can operate on Heavy Fuel Oil (HFO).
    These gas turbines are designed for dual fuel use with capability of switching between natural gas and HFO while still operating under load. HFO is often used as a backup fuel for peaking power plants or when natural gas supply is interruptible.

This flexibility to switch fuels is a very important advantage of 701DS’s. In respect to fuel type, within reason any and all heavier grades of fuel can be used as these are old design slow speed marine diesels that are not sensitive to fuel quality issues.
The application of 701DS in power industry will give the producers an advantage of economic flexibility switching to fuel oil when natural gas prices become expensive.

 

Used Power Plants
Specifications
Rating
250MW
 
Type
Gas Turbines
 
Manufacturer
Siemens
 
Model
W701DS
 
Fuel
Natural Gas
 
Hz
50Hz
 
Ref #
26323
 
Note

Scope of Supply:

The two (2) GTG sets are a nominal 127.8MW machines each including the following scope of supply:
Gas Turbine W701DS
GT Engine;
Dual Fuel Std Combustion System;
Turbine Bearing Fire Fighting
On Board I & C Devices;
On Board Air Cooling System;
On Board Bypass System.
Generator
Hydrogen Cooled Generator (excitation system included);
Rotor Jacking Oil System;
Hydrogen Oil Sealing System.
Control Package
Vibration Motion System (Bently Nevada);
Gas Detection System (MSA);
Fire Protection Board (Ciodue).
Electrical Package
Motor Control Centre;
6kV Board;
Generator Protective Relay Panel;
Battery Charge with Batteries and Inverter;
Auxiliary Transformer;
Insulated Bus Bar Duct;
Generator Circuit Breaker;
Excitation Board;
Excitation transformer;
Lighting Board;
Starting System Board and Transformer (2 packages for 4 power islands).
Starting Package
Static frequency converter (1 package for 2 power islands)

SSS Clutch (SSS)
Barring Gear
Inlet Air System
Filter Room
Inlet Manifold
Inlet Silencer
Exhaust System
Horizontal Diffuser
Silencer
Vertical Stack
Diverter Box
Mechanical Package
Common Lube Oil System for the Gas Turbine and Generator
Atomizing and Instrumental Air System
Cooling Air System
Gas Fuel System Skid
Liquid Fuel System Skid
Cooling Water Skid
Water Injection Skid
Liquid Fuel Forwarding Skid
Cooler Assemblies
Air-to-Air Cooler for Rotor Cooling
Oil-to-Water Cooler for Lube oil Cooling
Water-to-Air Cooler for water Cooling System
Fire Fighting System (CO2 deluge)
GT Enclosure
Turbine Bearing
Mechanical Package Enclosure
Enclosures with Ventilation and Lighting System
Gas Turbine Module

Generator (only a shed)
Mechanical Package
Electrical Package

Control Room
Battery ad DC Distribution Room
Other
Emergency Diesel Generator with Relevant Board (1 unit for 2 power islands)
GT Pipe Rack Assemblies
Documentation
Layouts, P&I drawings, Single Line Diagram (as available on site)
O&M manuals (as available on site)
Terminal points
The used Gas Turbine Package is delimited by the following boundaries:
Natural Gas: at inlet flange of the gas skid in the mechanical packages
Diesel Fuel Oil: at inlet flange of the GT injection skid
15 kV: insulated bus bar duct terminals
I&C Interconnection: at marshalling box at the supplied equipment
Other Utilities (water, etc.): at inlet flange at the supplied equipment
Pipe rack: at boundary of the power island
Exclusions
The following equipment, systems and connections, necessary in order to operate the power plant, are excluded in the current scope of supply:
Generator step up transformers
Consideration by purchaser to replace existing filter rooms with new pulse cleaning type filters if in desert area
Pipes with diameters ≤2"
Cables, conduits and cableways
Control Systems
Battery
Pipework insulation
Valves, fittings, pipes, cables, structures and any other material of any kind outside terminal points
Communication systems
Fire-fighting system(s) apart GT bearing, GT and mechanical enclosures
Gas reducing/Compression station
Tank and tank farm
Fuel oil transfer from tank to forwarding skid· Fuel oil treatment system
Fuel oil unloading bay system
Electrical substation
Ancillary buildings (e.g. warehouse, workshop etc.) with relevant equipment
Lighting system outside the existing GT power island boundary
Lightning system
Embedded systems and materials (e.g. oily and rainy water; raw, portable and demi water; sewage; cathodic protection; earthing grind etc.)

Water-treatment plants (e.g. raw, potable, oily, demi etc.)
Hydrogen storage and/or production system
DCS for power plant control
Power plant electrical system supply
Black start system if required
HV and I&C interconnection to HV substation
Any kind of modification request to comply with new site design conditions, norms, codes, local laws etc.

 


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