Metal Content This is a term used to describe any metallic component of a residual fuel. Redwood No.1 This is an obsolete unit of viscosity measurement. It is still quoted occasionally, but is calculated from measured kinematic viscosity. Residual Fuel Oil This is a term for fuel oil mainly comprising of the residues remaining after refining crude oil. HFT (Hot Filtration Test) The test for cleanliness and stability has now been replaced by ISO 10307-1 and ISO 10307-2. Short Residue’ This is a residual fuel component that is produced in a distiller’. It normally has to be cut ‘vacuum back with gas oil. It is good because it has excellent stability and a low density. Silicon - see Aluminium plus Silicon Sodium Sodium can be present in the fuel as a result of salt water contamination or may occasionally be present as a result of refinery processing. Sodium in fuel can be reduced by centrifuging. Specific Energy - see Calorific Stability Fuel oils are produced from a wide variety of crude oils and refinery processes. When marine fuel oils are produced they are normally tested for stability, using ISO 10307-1 and ISO 10307-2. If it becomes necessary to mix different fuels together, great care must be taken because even the mixing of stable components can result in an unstable final blend. The use of incompatible fuels results in large amounts of sludge being taken out by fuel oil centrifuges and purifiers, and frequently leads to centrifuge blocking. To produce a stable mixture, it is essential to use proper blending equipment. Under no circumstances should blending be attempted onboard a vessel after delivery, as it is almost certain that the mixture will not be homogeneous, and is highly likely to be unstable. Straight Run Fuel
Metal Content This is a term used to describe any metallic component of a residual fuel. Redwood No.1 This is an obsolete unit of viscosity measurement. It is still quoted occasionally, but is calculated from measured kinematic viscosity. Residual Fuel Oil This is a term for fuel oil mainly comprising of the residues remaining after refining crude oil. HFT (Hot Filtration Test) The test for cleanliness and stability has now been replaced by ISO 10307-1 and ISO 10307-2. Short Residue’ This is a residual fuel component that is produced in a ‘vacuum distiller’. It normally has to be cut back with gas oil. It is good because it has excellent stability and a low density. Silicon - see Aluminium plus Silicon Sodium Sodium can be present in the fuel as a result of salt water contamination or may occasionally be present as a result of refinery processing. Sodium in fuel can be reduced by centrifuging. Specific Energy - see Calorific Stability Fuel oils are produced from a wide variety of crude oils and refinery processes. When marine fuel oils are produced they are normally tested for stability, using ISO 10307-1 and ISO 10307-2. If it becomes necessary to mix different fuels together, great care must be taken because even the mixing of stable components can result in an unstable final blend. The use of incompatible fuels results in large amounts of sludge being taken out by fuel oil centrifuges and purifiers, and frequently leads to centrifuge blocking. To produce a stable mixture, it is essential to use proper blending equipment. Under no circumstances should blending be attempted onboard a vessel after delivery, as it is almost certain that the mixture will not be homogeneous, and is highly likely to be unstable. Straight Run Fuel
SAO-Marine-Products-Spec-Guide.docx