2.2 Fuel storage and pumping Onboard s Learning Objectives The learning objectives of this section are to make all engineers, engine cadets and other crew members who are involved in the handling of fuels on board, familiar with: How to handle the fuel Take the necessary simple precautions by following test procedures To evaluate and find the correct temperatures of the fuel related to storing and pumping. To undertake the correct operation when performing stripping and trimming
2.2 Fuel storage and pumping Onboard • Learning Objectives The learning objectives of this section are to make all engineers, engine cadets and other crew members who are involved in the handling of fuels onboard, familiar with: – How to handle the fuel. – Take the necessary simple precautions by following test procedures. – To evaluate and find the correct temperatures of the fuel related to storing and pumping. – To undertake the correct operation when performing stripping and trimming
2.2 Fuel storage and pumping Onboard Storage temperatures 1. In general, bunkers should be stored at temperatures that allow reliable pumping while preventing build-up of wax in tank bottoms 2. The use of bunker tanks for water ballast should be avoided 3. The storage tanks should be maintained at a temperature that allows the fuel to be pumped or moved by gravity, without undue difficulty. 4. A temperature of about 45C will normally ensure good flow and pumping conditions
2.2 Fuel storage and pumping Onboard Storage temperatures 1. In general, bunkers should be stored at temperatures that allow reliable pumping while preventing build-up of wax in tank bottoms. 2. The use of bunker tanks for water ballast should be avoided. 3. The storage tanks should be maintained at a temperature that allows the fuel to be pumped or moved by gravity, without undue difficulty. 4. A temperature of about 45℃ will normally ensure good flow and pumping conditions
Table 2. 1 Heating requirements for pumping ⅵ iscosity, cSt at50 700 500 380 180 100 20 Temperature
Table 2.1 Heating requirements for pumping the
2.2 Fuel storage and pumping Onboard · Heating and cooling Storage heating capacity should be capable of raising the fuel temperatures to 45C 2. With high pour point waxy fuels, the temperature should not be allowed to approach the pour point. Otherwise, when the fuel is reheated for pumping, there may be great difficulties in reeling the wax structures that have formed in the tank 3. If the fuel has been allowed to cool however, extended heating time may be needed to dissolve all the wax in order to avoid filter blocking
2.2 Fuel storage and pumping Onboard • Heating and cooling 1. Storage heating capacity should be capable of raising the fuel temperatures to 45℃ 2. With high pour point waxy fuels, the temperature should not be allowed to approach the pour point. Otherwise, when the fuel is reheated for pumping, there may be great difficulties in remeling the wax structures that have formed in the tank. 3. If the fuel has been allowed to cool however, extended heating time may be needed to dissolve all the wax in order to avoid filter blocking
2.2 Fuel storage and pumping Onboard NOTE: fuel oils should never be heated to more than 10C below the actual flash point Heating coils should extend all over the tank bottom area to ensure that wax can be dissolved. If heaters are situated at the outflow only, wax may build up elsewhere in the tank Fuel tank heating coils: The storage tanks are heated by means of steam, and two kinds of leakage problems may occur:
2.2 Fuel storage and pumping Onboard • NOTE: fuel oils should never be heated to more than 10℃ below the actual flash point. Heating coils should extend all over the tank bottom area to ensure that wax can be dissolved. If heaters are situated at the outflow only, wax may build up elsewhere in the tank. • Fuel tank heating coils: The storage tanks are heated by means of steam, and two kinds of leakage problems may occur: