LONDON, June 18 (Reuters) -Planned export volumes for Angolan crude stand to increase month-on-month in August, according to preliminary export plans seen by traders.

* Africa's number-two exporter Angola is set to export 41 crude oil cargoes in August, up from 36 planned for July and the same number in June.

* The relatively large increase includes two cargoes, a CLOV and a Girassol, deferred from July.

* The July export programme sold out late last week, in a relatively swift month for sales as China bought robustly in the latter part of the trading cycle.

* Sales of Nigerian crude for export in July picked up slightly after a lackluster start but flows of light sweet crude to Europe remain under pressure from competing U.S. crude grades.

* Medium sweet Nigerian grades were selling at relatively better prices, with Forcados and Escravos crude being offered at between dated Brent plus $3-$4, traders said.

Reporting by Noah Browning; Editing by Rod Nickel

 WEST AFRICA CRUDE OIL DIFFERENTIALS AND OUTRIGHT PRICES: 0#BFO-DIF 0#C-E Bonny Light BFO-BONBON-E Cabinda BFO-CABCAB-E Forcados BFO-FOCFOC-E Qua Iboe BFO-QUAQUA-E CRUDE ARBITRAGE STORIES O/CRUDEARB CRUDE OIL TRADES CRU/T NORTH SEA CRUDE REPORT CRU/E MEDITERRANEAN CRUDE CRU/MED 7 W Africa Asia crude exports, monthly O/WAFRICA1 New African oilfields AFR/NEW ENERGY speed guide CRUDE/1 crude speed guide NYMEX crude 0#CL: ICE crude 0#LCO:OPEC NSEA North Sea CRU crude oil PROD oil products DRV derivatives PRO/E European products O/L Latest ICE O/N Latest NYMEX OILOIL NYMOIL, IPEOIL, OILSPD, OILARB CRDWLDPRODEUR))