The Complete Guide to Gas Turbine Spare Parts

What are Gas Turbine Spare Parts?

Gas turbine parts are generally identical, but due to the difference in terminology for each manufacturer, the naming process of gas turbine parts varies slightly among the OEMs. Gas turbines are composed of three main components: compressor, combustor, and power turbine sections. But these three main components consist of hundreds of sub-components and parts.

Compressor Parts:

The compressor is in fact one of the important gas turbine parts that are used to raise inlet air pressure to a higher level. The rotating blades attached to the shaft force the air between stationary blocks, which raises air pressure, and at the compressor outlet, high-pressure air is available. There are several sets of small airfoil blades consisting of the compressor some of them have been attached to the inner shaft and rotate at high speed, while others remain stationary. The rotating part is referred to as the rotor and the fixed one is referred to as the stator. The main parts and components of a combustion system at a gas turbine are:

● Compressor Rotor Blades

● Compressor Stator Blades

● Compressor Casings

● Rack & Ring Assemblies

● Inlet Guide Vanes

● Inlet Bell Mouth

● IGV Bushings

● IGV Gears & Gear Racks

● Shims, Keys, Spacers, etc.

Combustion Parts:

The combustion section of a gas turbine is one of the very important gas turbine parts, which is between the compressor and the turbine flow direction. The main parts and components of a combustion system at a gas turbine are:

● Combustion Liners

● Combustion Liner Parts

● Combustion Cans

● Transition Pieces

● X-Fire Tubes (male & female) & Retainers

● Flow Sleeves

● Spark Plug Assemblies

● Flame Detectors

● TP Hardware

Turbine / Hot Section Parts:

The hot exhaust gases from the combustion section pass the turbine and leave the nozzle and generate power. The two important roles of the nozzles are to make thrust by accelerating thrust generation via heat exhaust gas and control the turbine’s mass flow. Similar to the compressor, in the turbine section we also have a rotor and stator but the main difference is that the exhaust gases are very hot and all parts in this section need to be resistant to the very high temperature. That is why this section is sometimes called the hot section in the gas turbine. Some of the main parts and components of a hot section at a gas turbine are:

● Nozzles

● Nozzle Hardware

● Nozzle Upgrade Sets / Hardware

● Buckets

● Bucket Hardware

● Shrouds

● Shroud Hardware

● Support Rings

Fuel Systems

In addition to the main three sections mentioned above, the gas turbine needs auxiliary systems to let it operates constantly and efficiently. These auxiliary systems provide fuel, lubrication, and control of all systems. One of the auxiliary systems is the fuel system which provides fuel in the combustor at the desired pressure and amount. Some of the main parts and components of a fuel system at a gas turbine are listed below:

● Fuel Pumps

● Fuel Nozzle Assemblies

● Fuel Nozzle Components

● Fuel Tank

● Flow Dividers

● Check Valves

● Piping / Flex Hoses

Casings & Packaging

The whole three main sections of a gas turbine are held by a casing. Generally, in a gas turbine, the casing contains the rotor and nozzles through which the hot gases are expanded and directed against the rotating buckets. Gas turbine casing also defines the boundary of part of the turbine flow duct and is formed from various segments, each segment being mounted from the fixed structure by a plurality of radially extending struts. Air is conducted into the compressor section through the ducts and also expanded gasses exited from the turbine section through the stack. The air needs to be filtered before entering the compressor. The filters are kept in the filter house which is ducted to the inlet of the compressor. Here you may find some other parts and components of a gas turbine package:

● Filters

● Filter House

● Inlet Casing

● Compressor Casing

● Compressor Discharge Casing

● Turbine Casing

● Exhaust Plenums & Stacks

● Exhaust Frame Assembly & Diffuser

Gearbox & Coupling

A coupling is used to connect the turbine shaft to the generator and sometimes a gearbox is also used to tune the speed of the turbine shaft and change it to the desired speed for the generator. There is also another gearbox called the accessory drive that is part of a gas turbine (not part of the core engine), and it drives the accessories, such as fuel pumps, etc. Here you may find some main parts and components of a gas turbine gearbox and coupling:

● Gearbox ● Quill Shafts ● Accessory Gear Parts ● Load Couplings ● Accessory Couplings ● Accessory Gear Parts

Miscellaneous

There are other parts and components such as valves, bearings, sensors, etc. that are essential for the operation of a gas turbine. Here is a list of more parts and components in a gas turbine:

Valves

● Servo Valves ● Solenoid Valves ● Fuel Valves ● Control Valves ● Control System Parts ● Actuators

Bearing, Assembly & Hardware ​​

● Lock Plates ● Nuts, Bolts, etc. ● Gaskets, Seals, etc. ● Fiberglass Gasket ● Sealing Core Gaskets ● Flat Gaskets ● Rope Gaskets ● Braided Gaskets ● Tadpole Gaskets ● Tapes ● Tadpole Tape ● Fabrics ● Coated and Non-Coated Fiberglass Sleeving ● Bearing Seals ● Oil Deflectors ● Thrust Bearings ● Bearing Hardware ● Tooth Material ● Bearing Housings ● Aluminum Bearing Seals

Sensors

● Vibration Sensors ● Magnetic Pick Ups ● Thermocouples ● Pressure Gauges ● Pressure Transmitters ● LVDT’s ● RTD’s

● Generator Parts

● Motors

● On- and off-engine cables

● Lube & scavenge pumps