Hydraulic Clearance Optimization (HCO)
Valid for following frames: SGT5-4000F (V94.3A), SGT6-4000F (V84.3A), SGT5-2000E (V94.2)
Power increase in simple cycle operation: up to 2 MW and in combined cycle up to 3 MW
Efficiency increase in simple cycle operation: up to 0.3 %-points and in combined cycle up to 0.2 %-points
Power up your performanceThe performance enhancement feature of the Hydraulic Clearance Optimization upgrade (HCO) is achieved by shifting the rotor against flow direction to optimize turbine clearances during steady state operation. The axial shift of the rotor is performed automatically by hydraulic pistons behind the compressor thrust bearing. The gain in power and efficiency due to the conical shape of the turbine is expected to be higher than the potential losses on the compressor side. The Hydraulic Clearance Optimization upgrade is implemented after an one hour warm-up period, i.e., when differential thermal expansions of rotor and casing components have equalized. Should a loss of hydraulic pressure occur, the system is designed for the rotor to move back to its original position automatically in a “fail-safe” manner.
The Hydraulic Clearance Optimization provides significant performance advantages and offers attractive financial payback options.
The Hydraulic Clearance Optimization upgrade offers you a clearly technical and monetary quantifiable benefit and can be a cost-effective means to help you improve the overall performance of your gas turbine plant.
Benefits may include:
- Power improvement up to 2 MW in simple cycle operation and up to 3 MW in combined cycle operation *
- Efficiency improvement up to 0.3 %-pts. in simple cycle operation and up to 0.2 %-pts. in combined cycle operation * / **
The HCO upgrade can be combined with other modernizations such as the Compressor Mass Flow Increase or the Turn Down upgrade.
The Hydraulic Clearance Optimization is state-of-the-art for Siemens gas turbines since 2009.
* Actual results may vary.
** Turbine Exhaust Temperature = constant
Scope of Supply
The Hydraulic Clearance Optimization upgrade from Siemens is just one of the many innovative modernization packages available.
The scope of this upgrade includes:
- New combined compressor bearing
- Hydraulic pistons installed behind the compressor axial bearing
- Auxiliaries (e.g. additional hydraulic system, control device and piping)
We recommend that the installation of this upgrade be performed at a major outage. We offer a full range of field service capabilities to help you manage your maintenance and outage schedules.