person in charge to monitor tank levels at all tank levels. Tank level monitoring allows the person in charge to take early action to avoid oil spills, especially when loading the ship. Tank level information is often sent to computers that calculate hull stresses such as shear forces and bending moments. Various other functions are available in some cargo control rooms. Many offer the person in charge additional monitoring and control systems, the ability to monitor inert gas systems, and tank pressures. Modern cargo control rooms typically allow the person in charge to control ballast pumps and valves, and monitor oil content of ballast water by the use of oily water separators. In cases where ships carry specialty products, specialized monitoring systems are available in the cargo control room. See also Oil tanker Chemical tanker Notes References . External links In Alaska: An Oil Tanker Sails NK Rules For Centralized Cargo Monitoring and Control Systems Petroleum technology Tankers