Both oil residues (sludge) and sewages collected on board must be delivered to the reception facilities, regularly.
In this regard, there are two types of standard discharge connections. This article mentions the specifications and requirements of this connections based on the MARPOL Convention.
This is necessary in order for authorities to be able to monitor if a vessel’s crew has performed any illegal oil discharge at sea. All officers and crew onboard need to recognize that recording of ORB is required by the rules and the records are critical.
In accordance with MARPOL/Annex I/Reg. 12, ships with a gross tonnage of 400 and above are mandated to be equipped with a tank or tanks of sufficient capacity. The capacity should be determined with consideration given to the type of machinery and the duration of the voyage, ensuring the proper reception of oil residues (sludge).