Interval Extension – Compressor Upgrade

Gas turbine customers continue to look for products to increase availability while reducing maintenance costs. GT Interval extension products have been specifically developed to address both these needs. Interval extension products were developed to extend the duration between planned maintenance inspection intervals, which can result in increased availability and in some cases, may eliminate certain type of inspections (e.g. combustor inspections) resulting in reduced maintenance costs.

In the example below a unit operating at 50k EBH turbine inspection intervals now operates at 66k EBH turbine inspection intervals.

This change in operation provides the following benefits:

1. Same number of outages and scope but extended over 133k EBH compared to 100k EBH, helping to reduce overall maintenance costs
2. Extended duration of 66k EBH between outages which can result in improved availability
3. Typically, interval extension products also come with advanced Siemens technologies that can help improve performance when coupled with TPU (Thermal Performance Upgrades) products

Note: EBH = Equivalent Base Load Hours, ES = Equivalent Starts, HGP = Hot Gas Inspection, MI = Major Inspection

The following section highlights available recommended interval extension options for the compressor section.  

For turbine and combustor interval extension products, please refer to the following:

• Interval extension products: Turbine
  
• Interval extension products: Combustor

Applicable Frames: SGT6-5000F (FC, FD, FD2, FD3)

• Enhanced operation reliability
  
• Increase in hours between planned inspections (up to 66k EBH)
• Reduced life cycle costs

• New tie bar design Row 6 diaphragm
• Advanced coating on the diaphragm shrouds and blade ring grooves of Row 7 and 8