As part of the contract, GE will supply aeroderivative gas turbine driven centrifugal compressor packages which will become the "heart of the pipeline".
The company will manufacture and test the equipment in Florence, Italy for scheduled delivery in 2017.
GE Oil & Gas Middle East, North Africa and Turkey (MENAT) president and CEO Rami Qasem said: "This marks a key milestone for GE Oil & Gas and underlines our long-term commitment to Turkey where GE has been driving several localization initiatives as part of its US$900 million investment announced in 2012 in support of Turkey’s Vision 2023.
"The contract reiterates our commitment and proven track-record to support game-changer projects, such as TANAP that will not only support local economies through job creation and economic value but also strengthen the energy security of markets across Europe."
Estimated to cost $11.7bn, the 1,850km pipeline is expected to ensure uninterrupted gas flow from Shah Deniz gas field in Azerbaijan to Europe.
Planned to be commissioned in 2018, the first phase of TANAP project involves construction of 1,334km pipeline from the Turkish-Georgian border to Eskishehir province.
BP has 12% interest in the pipeline project while Azerbaijan’s state-owned oil company Socar and Turkish oil and gas group Botas own 58% and 30% stakes respectively.
