VESSEL'S WATER INTAKE AND ANTIFOULING DEVICE (AFD)

The through-hull assembly, for uncontaminated water sampling, must be installed forward of any grey, black or heated water discharges and approximately 2 meters below the water line.

The containment vessel is part of the gate valve and through-hull assembly. It contains a computer activated rotary valve which will be closed in conjunction with the pump being stopped in the event of unexplained water being detected in the instrument enclosure.

External to the gate valve is the water intake scoop, which stabilizes the end of the sampling probe away from the direct contact with the hull and provides the seat for the eternal thermometer. It is designed to provide positive pressure when the vessel is moving to help prevent bubble formation in them sample lines.

An electro-chemical antifouling device (AFD) is installed within the scoop (or in the external housing of the submersible pumps for fixed platform installations) and is activated for a few minutes every twenty-four hours to reduce the effects of biological fouling.

Containment vessel with emergency shut off rotary valve