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How to deal with tendency to low quality Fuel Oil and engine operation

When a ship is chartered out, the charter party requires Fuel oil(FO) in compliance with the ISO standard only, increased possibility of loading low quality FO is anticipated. Therefore, onboard Chief Engineer shall try to grasp the qualities of the loaded FO as early as possible, and if any abnormality is discovered, the actual conditions shall be reported to the company Technical Superintendent immediately.

Tendency to low quality Fuel Oil and engine operation

(1) The Chief Engineer shall grasp the tendency in qualities of the loaded FO as early as possible by the following methods:

(a) When an analysis by third party is carried out, the results.

(b) CCAI values by an easy test kit possessed by the vessel, observation under a microscope, and observation of filter paper.

(c) Results of burning trial.

(d) Quantity and natures of drain and sludge from the purifier and settling tank, and clogging state of the filter.

(e) Change in number of times of backwash of the FO backwash filter.

Measures against low quality fuel oil

(a) Size of Gravity disk, inlet temperature, and blow intervals for FO Purifier shall be selected strictly.

(b) The spare purifier shall be used in parallel to reduce oil flow rate for purifying effect.

(c) High density oil (0.991 or higher) shall be treated by serial operation of a purifier and a clarifier.

(d) Bottom blow to the settling tanks and service tanks shall be carried out.

(e) Use of an emulsion breaker and a FO additive shall be considered to FO with excessive water and sludge, and low ignition qualities.

(f ) A third filter (5 micron type) shall be used for FCC catalysis FO.

(g) For low ignition qualities FO (High-CCAI value), the VIT or FQSL shall be adjusted to proceed injection timing so that the prescribed maximum pressure may be obtained.

(h) For low ignition qualities FO (High-CCAI value), an overload, torque rich operation or excessively low speed operation for a long period of time shall be avoided as far as possible.

(i ) For low speed operation, cooling water temperature and scavenging air temperature shall be kept high within the allowable range to improve combustion.

(j ) The engine exhaust system, such as air cooler, super charger, exhaust gas economizer, and FO system, such as the FO purifiers, FO pumps, injection valves, shall be kept in good conditions all the time.

(k) Great care shall be paid to the factors that are affected directly by FO, such as RPM of the supercharger, scavenging pressure, exhaust gas temperature, colour of exhaust gas, and so on.

(l ) During an engine stop, an internal inspection of piston rings and liners shall be carried out periodically through scavenging ports and the like, which frequency shall be increased as far as possible after the use of a low quality FO.

(m) Torque rich operation for a long period of time shall be avoided, and use of low quality FO and torque rich operation combined increase thermal load to cause troubles related to the combustion chamber. During use of low quality FO in particular, excessive torque rich operation shall be avoided.

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