Sept 3 (Reuters) - The pipeline from Iraq's Kirkuk oilfieldto the Turkish port of Ceyhan, one of Iraq's largest crude oilexport lines, has been repeatedly attacked and has also sufferedregular maintenance problems.

The 960 kilometre (600-mile) Kirkuk-Ceyhan link carries anaverage of 500,000 barrels of oil a day, around a quarter ofIraq's exports.

Iraqi oil infrastructure is generally dilapidated followingdecades of war, sanctions and underinvestment.

A combination of sabotage and technical problems meant thepipeline was mostly shut from the 2003 U.S.-led invasion of Iraquntil 2007.

Following a period of relative calm after securitytightened, attacks have increased along the Iraqi and Turkishparts of the pipeline route this year as detailed below:

Aug. 12 - Iraq resumed oil exports through the Kirkuk-Ceyhanpipeline two days after a bomb attack forced them to be halted.

Turkey blamed the outlawed Kurdistan Workers' Party (PKK),which has waged an insurgency against the Turkish state for aquarter of a century, for the bombing.

The PKK ended a 14-month ceasefire in June.

July 1 - Oil flows halted following a technical problem,which was subsequently compounded by a suspected PKK rebelattack.

June 12 - Iraq resumes crude exports after suspectedsabotage halted them on June 6.

A 2-metre section of the pipeline was damaged near the townof Shirqat, south of the northern city of Mosul and about 300 km(190 miles) north of Baghdad. Officials blamed sabotage.

April 26 - Crude exports resume after disruption caused by abomb planted in Iraq's northern province of Nineveh.

It was blamed on Sunni Islamist insurgents fighting toundermine the Shi'ite majority, which came to power after the2003 ouster of Sunni dictator Saddam Hussein.

Sectarian tensions have risen after elections in March thisyear produced no outright winner.

Dec. 24 - Flow of oil resumed after a four-day halt thatIraqi oil officials blamed on sabotage.

For a related feature on security concerns around Iraq's oilfuture, click on

For a related interview on security in Iraq, click on

(Editing by Jane Baird)