* Huntington oilfield producing at 40 pct capacity -partner
* Field partner cites constraints with BP's CATS pipeline
OSLO, Oct 21 (Reuters) - The North Sea Huntington oilfieldin waters off Britain is producing at only about 40 percent ofcapacity due to problems in using a pipeline operated by energymajor BP, a partner in the field said on Monday.
Norwegian oil firm Noreco said it was unclear whenoutput at the small field, which is operated by German utilityE.ON, could be ramped up.
Noreco's share of Huntington's production was 3,391 barrelsof oil equivalent per day in September. This would bringHuntington's total output to some 17,000 boe per day last month.
But the field has the potential to produce 40,000 boe perday, Noreco said last month.
E.ON, which also pumps some gas out of the field, must shipsome of that gas via the CATS gas pipeline to be able to produceoil. The capacity to do so is limited, however, by constraintson the pipeline, Noreco said.
"It still is CATS that is the problem. We expect furtherinformation from the operator in the coming days," Noreco ChiefExecutive Svein Arild Killingland told Reuters.
Noreco holds a 20 percent stake in the field, E.ON 25percent. Premier Oil of Britain 40 percent and Canada'sIona Energy 15 percent.
BP could not immediately be reached for comment.
The Central Area Transmission System (CATS) is a 404 km (251mile) pipeline that transports gas from the North Sea toTeesside in northern England.
A major gas pipeline for Britain, it can handle more than 48million cubic metres of gas per day.
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