CPP

Normally leaded with high lead content. Except for some rare unleaded grades AVGAS is always dyed.
Water cannot be tolerated, thus tanks and lines must be dry and mopped before loading.
FAME contamination could lead to specification issues and must thus be avoided.

Products are unleaded, but contain relatively high sulfur levels.
Water cannot be tolerated, thus tanks and lines must be dry and mopped before loading.
FAME contamination could lead to specification issues and must thus be avoided.

Usually Motor Gasoline is unleaded, contains MTBE and is dyed. Increasingly depending on regions grades are ULS, meaning they have extremely low low sulfur content (less than 50 down to 10ppm depending on region). Some grades are blended with Bioethanol.

In general gasoline ins a complex mixture of alkanes, alkenes, cycloalkanes, iso alkanes and aromatics.
Often these 3 types are blended during loading according to the shippers instructions.

This is a heavier fraction compared to Gasoline, with a higher boiling range. The molecules are in the size range of C8 to C21. To distinguish this from Bio Diesel, petroleum-derived diesel is increasingly called petrodiesel.
Ultra-low sulfur diesel (ULSD) is a standard for defining diesel fuel with substantially lowered sulfur contents. As of 2007, almost every diesel fuel available in America and Europe is the ULSD type.
For cleaning of last cargo Diesel to high purity standard a detergent should be used, because of its non-water soluble heavy fractions.

Biodiesel can be obtained from vegetable oil (vegidiesel/vegifuel), or animal fats (bio-lipids), using transesterification. Biodiesel is a non-fossil fuel, cleaner burning alternative to petrodiesel. It can also be mixed with petrodiesel in any amount in some modern engines, but some manufacturers strongly recommend against such use.

Chemically, most biodiesel consists of Fatty Acid Methyl Esters (FAME) instead of the alkanes and aromatic hydrocarbons of petroleum derived diesel. However, biodiesel has combustion properties very similar to petrodiesel, including combustion energy and cetane ratings.

A variety of oils can be used to produce biodiesel. These include: Rapeseed and soybean oils are most commonly used, soybean oil alone accounting for about ninety percent of all fuel stocks in the US. It also can be obtained from field pennycress and jatropha and other crops such as mustard, flax, sunflower, palm oil, coconut, hemp.

Blended Biodiesel is a blend of FAME or FAEE and mineral diesel. The percentage of biological component is often designated in the grade name, e.g. B15 indicates 15 % biological component. Pure FAME is often referred to as B100.

Naphtha is obtained in petroleum refineries as one of the intermediate products from the distillation of crude oil. It is a liquid intermediate between the light gases in the crude oil and the heavier liquid kerosene.

Naphtha and light distillate feedstocks should not be contaminated by lead and should not be carried directly after cargoes that contained lead e.g. aviation gasoline. Oxygenates can affect naphtha processing and washing is therefore required when
loading naphtha into tanks which have previously contained unleaded gasoline cargoes. Sea water washing should be followed by a fresh water rinse to remove chlorides.
Heavier feedstocks can tolerate minor admixing of aviation kerosene, kerosene, solvents or lighter feedstocks.

Products may contain relatively high levels of sulphur which could affect the quality of a subsequent low sulphur cargo.
Admixing of dyed kerosene with un-dyed kerosenes can result in the un-dyed cargo not meeting colour specifications. Tanks which have carried dyed products will require washing and mopping dry prior to loading un-dyed products. Where dye is not a concern, these products will not require tanks to be mopped after water washing unless following lube oil or light fuel oil.

The quality of lubricating oils is greatly affected by admixing with water and tank preparation will normally include mopping. Valves and strainers will also require opening and draining.
To maintain quality and avoid introduction of water, lubricating oils should be loaded, carried and discharged under air and not inert gas.