* Angola to export 1.58 million bpd in August
* Qua Iboe valued around dated plus $2.20-$2.40
* India, Indonesia tender results awaited
LONDON, June 16 (Reuters) - Angola is scheduled to export less crude oil in August than July, provisional loading programmes from trade sources showed on Thursday.
Some Nigerian crudes were expected to come under pressure as there are relatively ample remaining supplies for July.
* A preliminary loading schedule showed exports of 1.58 million barrels per day (bpd) on 51 cargoes in August, including six shipments of Cabinda, eight of Dalia and five of Plutonio.
That would be down from July's total expected to average 1.7 million bpd.
* Traders said it was too early for any offers or spot trades for August cargoes, although the slight decline in exports could lend values some support.
* Some grades are looking relatively long for July. Five cargoes of Agbami are stil available, traders said. Offers were heard around dated plus $1.20.
* Bonny: Sellers not showing offers as participants are awaiting a revised loading programme from Shell after this week's force majeure declaration. A trader said relatively small delays of two to three days were expected at most.
* Qua Iboe: valued notionally around dated Brent plus $2.20 to $2.40, unchanged from the previous session.
* Indian Oil Corp has a buying tender out for August cargoes. The price and grade offers should be submitted on Tuesday and Wednesday and should remain valid until Thursday.
* Petral, the trading unit of Indonesian state-run energy firm Pertamina, reissued a tender to buy sweet crude for August delivery. The tender closes later on Wednesday with offers valid until a day later, they said.
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(Reporting by Alex Lawler; editing by Jason Neely)