* U.S. Senate expected to approve debt deal on Tuesday
* U.S. crude to fall below $90 -technicals
* Coming Up: U.S. API weekly oil inventories; 2030 GMT (Updates prices)
By Alejandro Barbajosa
SINGAPORE, Aug 2 (Reuters) - Oil slipped on Tuesday as a slowdown in global manufacturing activity prompted bearish demand prospects, overshadowing the approval of a debt deal by the House of Representatives to avert a default by top crude consumer the United States.
Brent
In Washington, the focus now turns to the Senate, where the $2.1 trillion deficit-cutting plan is expected to be approved in a vote on Tuesday, the deadline to lift the nation's debt limit.
"The market is going to be thinking about the fundamental side of the economy, as well as what is going on in Washington, so it should be volatile" in coming days, said Jeremy Friesen, commodity strategist at Societe Generale in Hong Kong.
The debt plan "is cutting back on the fiscal stimulus, but there is still enough ammunition for the Fed to keep growth going for the remainder of the year," he added.
Earlier, U.S. crude rebounded from a one-month low after the House passed the budget deal, restoring some optimism to markets battered by the disappointing economic data.
The U.S. Institute for Supply Management manufacturing report, a gauge of factory activity in the world's largest economy, fell to 50.9 in July, its lowest since July 2009.
Brent crude edged higher on Monday as North Sea oilfield maintenance and violence in the Middle East offset the weaker global factory data.
BP said the North Sea Forties Pipeline System would be closed for five days this week to allow workers to remove an unexploded mine from World War II discovered in water near the pipeline.
France's Total shut its North Sea Elgin platform, which pumps 104,000 barrels per day of condensate, for summer maintenance, the company said, without disclosing the duration.
RISING STOCKPILES
U.S. crude oil inventories probably rose by 1.2 million barrels last week as increased supplies from the Strategic Petroleum Reserve offset losses due to Tropical Storm Don, a Reuters poll showed on Monday.
Gasoline stockpiles were projected unchanged for the week, the poll showed, while distillate stocks were expected to have risen 1.5 million barrels.
Industry data on inventories from the American Petroleum Institute (API) will be published on Tuesday, followed by government statistics from the Energy Information Administration on Wednesday.
Tropical Storm Emily formed near the Caribbean's Lesser Antilles islands on Monday, far from oil and gas-production facilities in the U.S. Gulf of Mexico.
In other markets, Asian shares fell on Tuesday on concerns about the health of the global economy, while a strengthening yen prompted speculation that Tokyo may intervene in the markets to curb the currency's value. (Editing by Himani Sarkar)