DOP Submersible Dredge Pump 250 "Acciona" Two DOP250 have been delivered to the Spanish contractor Acciona, for emptying caissons in Brazil. At Sao Joao de Barra a new harbour is built along the Atlantic coast. Acciona will pump sand out of the caissons, enabling the repositioning of them. The sand is used for beach replenishment. See all deliveries