The MARPOL line on tankers is a dedicated pipeline used for stripping cargo residue from the main cargo lines.
Purpose of the MARPOL Line
The primary purpose of the MARPOL line is to facilitate the complete discharge of cargo from a tanker, minimizing the amount of residue left in the pipelines and pumps after unloading. This is crucial for:
- Environmental Protection: Reducing the discharge of oil and noxious liquid substances into the sea, complying with the International Convention for the Prevention of Pollution from Ships (MARPOL).
- Cargo Efficiency: Maximizing the amount of cargo delivered and minimizing cargo loss.
- Operational Efficiency: Streamlining the cleaning process of cargo systems.
Details of MARPOL Line
According to MARPOL Annex 1 Reg.18-Jan-2024, the MARPOL line is:
a pipe (separate line) of small diameter designed to release the last part of the cargo that remains after unloading in the pipes of the main lines, as well as in pumps.
Key Features
- Small Diameter: Typically smaller than the main cargo lines, the MARPOL line is designed to handle relatively small volumes of liquid.
- Dedicated System: It's a separate piping system, ensuring that the stripping process doesn't interfere with normal cargo operations.
- Strategic Placement: It is connected to various points within the cargo system, including the main lines and pumps, to efficiently collect residue.
Operation
- After the main cargo discharge is completed, the MARPOL line is activated.
- Pumps are used to draw the remaining cargo from the main lines and pumps into the MARPOL line.
- The collected residue is then discharged to the receiving facility.
Importance
The MARPOL line plays a crucial role in ensuring tankers adhere to international environmental regulations, preventing pollution, and optimizing cargo delivery.
