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Gas Turbine

DESIGN PRACTICE, OLD GENERATION GAS TURBINE EXHAUST SYSTEMS

Early generation offshore installed exhaust systems were typically designed with external thermal insulation, in combination with ducting fabricated in Austenitic Stainless Steel, and unfortunate combinations of material thicknesses and welding practice.As result, early generation systems are suffering from operational wear like extensive crack damages, leaking flanges, and degraded thermal insulation.Installations have in many cases been considered beyond repair and decided retrofitted.

As of today, operators realize that retrofit installation may not be practical and economic, due to high CAPEX and production loss during unit retrofit period.

NOBLE INSTALLATION EXHAUST SYSTEM EXTENDED LIFE™

Noble Installation has developed and patented proven upgrading products and methods extending the exhaust system life with more than 500 start/stop cycles, typically accumulating to 20 years extended operational life.

The extended life upgrade includes field activities without use of hot work, and by applying Noble Installation patented and proven methods and products

NOBLE INSTALLATION PROVEN PRODUCTS AND METHODS

Over the past 8 years, Noble Installation has focused on development of products and methods to
extend the life of old generation exhaust systems.

The designs are based on own inhouse technology, by personnel with up to 50 year experience in
engineering, manufacturing, testing and field servicing of Gas Turbine Packages.

The Life Extension Designs are made in compliance with OEM requirements and general Codes &
Standards, and in compliance with customer requirements.

EXHAUST SYSTEM HOT SPOTS.

Exhaust systems with crack damages and leaking flanges will suffer from external surface hotspots.
Hot spots may also be caused by degraded thermal insulation.
Surface hot spots with elevated temperatures may result in a hazardous situations if exposed to gas.

Typical exhaust duct hotspots.
Typical exhaust duct hotspots.

Noble Installation has developed and qualified a repair method to reduce hot spot temperature
levels.

Noble Installation have used our experience with gas turbine exhaust systems to develop new solutions for cost effective repairs, maintenance and operation based on proprietary, new products. The method includes use of Noble Installation patented products and methods:

  • HotBolt™ – self aligning bolts, see www.hotbolt.no
  • HotSeal™ – specialized seals for flanges etc.
  • CCRM™ Crack Cold Repair method
  • AlphaFlex™ Expansion Bellow
  • Noble Installation-LBH long fiber Ceramic insulation concept
  • Taylor made insulation pillows and panels