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.
- 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.