The new Siemens SGT-750: proven technology, perfected results.
Count on it.
>>When we started to develop the SGT-750, we carried out a comprehensive survey, where
we asked our customers, what was most important for them, both in terms of cooperation with us
at Siemens, and also the technical solutions realized in our turbines.
>>Customer value.
>>Uptime.
>>Performance.
>>Green power.
>>Flexibility.
>>It was clear, that the most important aspect for everyone was reliability. Our solutions
offer maximum uptime. The turbines themselves are of quality design and are constructed
in high-quality, robust materials down to the smallest detail. They are also extremely
service-friendly. Gas turbines from Siemens are renowned for the peace of mind they give
their owners. An operational disturbance, whether planned or unplanned, always involves
a loss of income for our customers. So we set up clear targets for operational reliability.
One target was to offer our customers a maintenance solution of only 17 days in 17 years of operation.
We achieve that goal partly by building in optimal serviceability right from the very
beginning of the design work. For example: we've used advanced 3D visualization techniques
to test and improve the serviceability on a 1:1 scale.
It was also clear, that we needed a new power output.
There was quite simply a gap in our range. Now we've filled that gap
with an extremely efficient 37 megawatt machine, and with technology, that keeps emissions
to a minimum.
>>All this – high-efficiency, low emissions, high reliability, and simple maintenance – yields
a higher lifetime value for the customer. Our turbines are there to deliver not only
power, but a source of income. We want our customers to sleep soundly at night without
worrying about the continuous operation of their gas turbines.
Quite simply, you can count on them.
>>Every part, every detail in the SGT-750 turbine has been designed for maximum customer
value and profitability. We have aimed for the perfect mix of high efficiency, low emissions
and maximum reliability.
>>Let's have a closer look at the details, starting at the very beginning with the rotors.
The rotors incorporate the heritage of Siemens Electron Beam Welding. The single rigid compressor
rotor body insures reliable, stable and uniform run-up in hot or cold conditions.
Axial blade attachment grooves allow blade replacement without rotor removal. The turbine disks are
bolted to the compressor rotor and supported with mineral oil-lubricated, long-life tilting
pad bearings. The balancing planes allow field balancing on-site without disassembly.
>>Even in the early engineering phase, we can design in future maintainability and serviceability.
>>The compressor is a 13 stage axial flow compressor with a 24:1 pressure ratio.
It offers a control diffusion airfoil for high efficiency and two variable guide vanes for
optimized performance, even in the most extreme conditions.
>>The combustors are the fourth generation of DLE burners from Siemens. Here we make
maximum use of the fuel input, while ensuring that both NOX and CO2 levels are kept under control.
>>DLE – dry low emissions combustion – is used in 100 percent of all SGT-700 and SGT-800
installations. And since 1990 it's also the standard combustion method used in the SGT-600.
The DLE turn-down capability enables the use of large single turbines, replacing multiple
small units, allowing the same operating envelope. It offers robust and stable operation with
dual fuel on-line switchover capabilities.
>>Following the flow direction, we come to the compressor turbine, which is based on
years of experience and expertise. Durability and wear resistance are the criteria here.
We entered infrared cameras to monitor detail temperature measurements. The cameras detect
the slightest change and enable us to carry out the right actions at the right time in
the event of an irregularity. When it comes to the power turbine, it is important to be able
to optimize the settings for each individual customer. The turbine has to generate the
optimal amount of power, whether it's located in arctic conditions,
in a temperate climate, or in the middle of the desert.
>>The free power turbine is a two stage, high-speed module nominally running at 6100 rpm.
It's equally suitable for mechanical drive application – or with speed-reduction gear – power generation.
The free power turbine makes the unit an excellent choice, where grid requirements call for maintained
power output in the event of frequency drops. It can be optimized for all ambient conditions –
arctic, temperate, and tropical climates.
>>The package is assembled as a unit on a single lift frame with a divider
between the turbine itself and the driven equipment. For on-shore installations, generators and other
equipment can be mounted on a separate concrete foundation. Our aim with the SGT-750 package
was to develop a compact and easily assembled unit. We achieved this by developing a generic
driver, which can be used both for single lift applications or on-shore installations,
where it can drive either generators or gas compressors. Inside the package is the lube
oil system, the start motor, gas fuel system, purge system, secondary air system and compressor
wash. To minimize the amount of time on site, we test all the equipment before it is delivered.
Outside the package we have the liquid fuel system, water injection and fire extinguishing system.
>>All our turbines are adapted in a cost-efficient manner for each individual customer's needs
and background, so that we can provide a complete solution. Important for us is that we can
offer the customer a complete concept at an early stage. The SGT-750 has been developed
to suit a number of different applications: everything from mechanical drive to power
generation, including combined heat and power. Both gas turbine and the package can be adapted
for the specific application of the individual customer, enabling him to gain maximal profit
from his project.
When it comes to serviceability, the SGT-750 is quite unique. We can offer our customers
extremely high uptime, with as little as 17 maintenance days during a 17 year service
cycle – if that's what the customer wants. We can replace the entire machine in 24 hours
to reduce downtime to a minimum. But the normal service concept is unique in itself. It is
based on a smart combination of remote monitoring and analysis of operation data: quite simple
service routines pursued by the customer himself and annual service visits to check the health
of the turbine with the help of infrared cameras. This way of working has enabled us to offer
really long maintenance intervals. Four years of operation, before we even need to open
the machine, is just the start. This gas turbine just goes and goes. The few times it has to
stand still, the design is so planned, that work goes as rapidly and smoothly as possible.
And when the work is done, the turbine is going at full power again within 10 minutes.
And as part of Siemens we can also offer a number of extended scope solutions, which
can encompass everything from fuel systems to generators, switch gear, transformers or
boilers. This delivery from a single source is a security package for the customer.
>>Different concepts are available of course. A customer may operate only half the year,
probably during the winter. And in this case, all service can be done on site, using the customers own personnel.
Service alternatives are many, as varied as our customers.