Singapore ports operator PSA International (PSA) has appointed former Shell CEO Peter Voser as its new chairman.

It said incumbent Fock Siew Wah will step down on 1 April.

He will become special advisor to PSA until his retirement on 31 July.

Voser is currently deputy chairman.

PSA said Fock has steered PSA with "visionary leadership and strategic foresight" since August 2005.

Volumes have doubled to more than 80m teu.