- Aeroderivative gas turbine
- A gas turbine derived from an aircraft engine, light and quick to start, for example the GE LM2500 and LM6000.
- Heavy duty gas turbine
- An industrial gas turbine built for continuous operation and long overhaul intervals, for example the GE Frame 9E or Siemens Westinghouse W501.
- ISO rating
- The output and efficiency of a gas turbine at standard conditions of 15 degrees Celsius, sea level and 60 percent relative humidity. Real output falls at higher ambient temperature and altitude.
- Heat rate
- The fuel energy needed to produce one unit of electricity, for example in kJ per kWh or Btu per kWh. A lower heat rate means higher efficiency.
- Simple cycle
- A plant where the gas turbine drives the generator and the exhaust heat leaves through the stack.
- Combined cycle (CCGT, CCPP)
- A plant where the exhaust heat of the gas turbine makes steam in a heat recovery steam generator and the steam drives a steam turbine for additional power.
- HRSG
- Heat recovery steam generator. The boiler behind a gas turbine that uses its exhaust heat to make steam.
- DLE and DLN
- Dry low emissions and dry low NOx. Combustion systems that cut nitrogen oxide emissions without water or steam injection.
- Dual fuel
- A turbine or engine that can run on two fuels, usually natural gas and diesel or light fuel oil.
- Hot gas path inspection
- A scheduled inspection of the combustion and turbine parts exposed to the hottest gas.
- Major overhaul
- The largest scheduled maintenance event, where the turbine or engine is opened completely and worn parts are replaced. Hours since the last major overhaul are a key value for buyers.
- Borescope inspection
- An inspection of the inside of a turbine or engine through small ports with an optical probe, without opening the casing.
- Equivalent operating hours (EOH)
- A count that adds operating hours and a weighting for starts, trips and fuel, used by some manufacturers to plan maintenance.
- Preservation
- Measures that protect a stored unit against corrosion, for example dry air, desiccant and sealed packaging. Buyers of stored units ask for the preservation records.
- Condensing steam turbine
- A steam turbine that exhausts into a condenser to produce as much power as possible.
- Back pressure steam turbine
- A steam turbine that exhausts at a pressure a process can still use for heat.
- Prime, continuous and standby rating
- Generator set ratings for unlimited variable load, unlimited constant load and limited emergency use.
- Power barge
- A floating power plant on a barge or ship hull, often with gas turbines or engines, that can be moved to a new site.
- LOI
- Letter of intent. A written statement by the buyer naming the unit, offered price, buyer company, end user, country of installation and payment route. It releases full data and inspection.
- POF
- Proof of funds. A bank letter confirming that the buyer can pay the purchase price.
- NCNDA
- Non circumvention and non disclosure agreement between the parties of a deal.
- Escrow
- A neutral third party that holds the purchase payment until the agreed conditions, for example delivery or transfer of title, are met.
- Letter of credit (L/C)
- A bank undertaking to pay the seller when the documents named in the credit are presented.
- Incoterms (EXW, FOB, CIF, DAP)
- Standard trade terms of the International Chamber of Commerce that define where risk and cost pass from seller to buyer.
- Exclusive sales mandate
- An agreement where an owner gives one broker the sole right to market a unit, so the unit appears with one price and one contact in the market.
More detail: buyer guide, gas turbine FAQ, steam turbine FAQ, generator set FAQ, glossary, how we work, inventory.