* Oil, equities pressured by economic jitters
* ECRI U.S. economic growth index drops to 3-wk low
* Coming up: CFTC positions data, 3:30 p.m. EDT Friday (Recasts, updates prices, market activity, new byline, changes dateline from previous LONDON)
By Robert Gibbons
NEW YORK, Aug 20 (Reuters) - Oil prices tumbled to a six-week low on Friday, headed for a second straight losing week as dismal economic data and bulging U.S. oil inventories kept investors worried about the economy and the outlook for oil demand.
Concerns about the global economy also revived risk aversion, strengthening the dollar and pressuring the euro. [
]A stronger dollar can pressure oil prices as money shifts out of more risky commodities and also because countries with other currencies must pay more for dollar-denominated oil.
U.S. crude for September <CLc1> fell $1.13 to $73.30 a barrel by 12:02 p.m. EDT (1602 GMT) on contract expiry day. It fell as low as $73.19 intraday, the lowest since July 7.
The more actively traded U.S. October contract <CLc2> fell $1.14 to $73.63 a barrel, while the front-month October Brent <LCOc1> contract fell $1.13 to $74.17.
A measure of future U.S. economic growth fell to a 3-week low in the latest week, the Economic Cycle Research Institute said on Friday. [
]U.S. stocks fell on Friday, tracking global equity markets lower as fears persisted that the economic recovery has hit a wall. [
]Oil prices were pressured this week by Wednesday's U.S. Energy Information Administration report that showed combined U.S. crude and refined products rose to 1.130 billion barrels in the week to Aug. 13 -- the highest level since the government began tracking weekly levels in 1990. [
]More disappointing U.S. economic data arrived on Thursday in reports that initial jobless claims rose to a nine-month high last week and mid-Atlantic manufacturing shrank in August.
"Even measured by the subpar nature of the macro numbers we have been seeing in recent weeks, Thursday's batch of figures were particularly disappointing. ... Excessive gains are getting rolled back given the 'slow-growth' track we seem to be on," said Edward Meir at MF Global in a research note.
On Friday, oil prices received negligible support from potential tropical weather threats brewing in the Atlantic.
A low pressure system southwest of the Cape Verde Islands strengthened overnight and has a medium, 40 percent, chance of developing into a tropical depression over the next 48 hours, the U.S. National Hurricane Center said Friday. The next named storm will be called Danielle. [
]Oil prices got no lift from a report from industry group American Petroleum Institute that U.S. demand for crude oil and petroleum products climbed 3.8 percent in July from a year ago, though the report showed gasoline demand was virtually unchanged. [
]RANGEBOUND TRADE
Oil prices have fallen by more than 10 percent from the early August high of around $82.97 a barrel and are now back in the $70-$80 range they have been largely confined in since last October.
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For a graphic on the technical outlook, see:
http://link.reuters.com/hes36n
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Analysts at the Schork Group expected increased volatility on Friday as the U.S. September contract approached expiration, and pegged support for the next front-month October contract at $72.34 and resistance at $77.20. [
] (Additional reporting by Emma Farge in London and Alejandro Barbajosa in Singapore)