MOSCOW, May 21 (Reuters) - Black Sea CPC Blend oil

exports via the Caspian Pipeline Consortium (CPC) pipeline

system are set to rise to about 5.3 million metric tons in June

from the 4.9 million planned for May, two sources familiar with

the matter said.

On a daily basis CPC Blend oil exports will rise by some 12%

from May's plan, Reuters calculations showed, as maintenance at

Kazakhstan's giant Tengiz oil field is scheduled to end this

month.

Tengizchevroil, the Chevron ( CVX )-led Tengiz operator, undertook

scheduled maintenance on one of the six production trains at the

Tengiz oilfield, resulting in a fall in oil output.

CPC does not comment on export plans via its system.