* China now takes more than half Iran's crude exports
* Indian purchases also rebound
* Iranian oil exports more than halve from 2011 (adds background on U.S. sanction exceptions)
By Humeyra Pamuk
DUBAI, July 17 (Reuters) - Iran is set to arrest a slide in oil shipments in July as China increases imports to a record high to account for more than half of Iran's crude exports and prevent a further slump in Tehran's oil revenues, an industry report said.
Iranian supplies are expected to average 1.084 million barrels a day in July, little changed from 1.094 million bpd of exports in June, in what Geneva-based consultancy Petrologistics said was a preliminary report.
Tehran's oil exports halved in the four months from February to June because of U.S. and European Union sanctions aimed at discouraging what the West fears is an Iranian programme to develop nuclear weapons.
Only four countries are expected to import Iranian oil in July -- China, India, Japan and Taiwan, Petrologistics said, although it is possible a cargo could be diverted to Turkey.
An EU embargo on oil purchases and shipping insurance came into force at the start of July, and non-EU Turkey has also cut back sharply on Iranian oil.
Having cut imports to negotiate price discounts, China is now easily Iran's biggest customer. It is expected to increase imports to 590,000 bpd in July, or 54 pct of Iran's total exports, from 430,000 bpd in June and 480,000 bpd on average on 2011, the Petrologistics report said.
If China's final customs data confirms the figures, China's exemption from U.S. sanctions that seek to enforce internationl cooperation with its efforts against Iran could be at risk. On Washington in June granted Beijing a six-month exemption from sanctions that threaten to penalise the countries that trade oil with Iran on the basis that China had cut imports.
India may find itself in a similar position. Its Iranian oil purchases in July are expected to rebound to 335,000 bpd from 264,000 bpd in June, a little above its average imports last year of 326,000 bpd, Petrologistics said.
The consultancy said privately held Essar Oil was responsible for the bulk of the import increase. Essar is not restricted by the Indian government's shipping and insurance regulations on Iran.
Taiwan will take one cargo, equivalent to 65,000 bpd, having imported nothing since March. It averaged only 30,000 bpd on average in 2011.
The increases by China and India contrast with Iran's two other big Asian importers in previous years, Japan and South Korea. Japan is expected to import 98,000 bpd this month or little more than a third of last year's purchases. South Korea cut imports from Iran to zero in July after failing to secure shipping insurance. It took 240,000 bpd last year.
The sanctions have forced Tehran to store crude in tankers at sea to avoid steep cuts in oil production.
But floating storage of crude and condensate dropped to 34.4 million barrels in June -- equal to 17 very large crude carriers -- from a peak of 42.8 million in May, Petrologistics said. (editing by Richard Mably and Dmitry Zhdannikov)
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