Slops
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Slop oils are off-spec products, originating either from process units (e.g. during startups, shutdowns, or upsets), or from the tankfarm (slop oils made by tank cleaning, line purging/service switch etc.) Slop oils are usually re-processed within basic refinery units (CDU) and recovered as such. The terminology may vary from place to place. Refering to your post, these could be: 1. Wet slop - containing significant amounts of dissolved and emulsified water, making this batch unsuitable for reprocessing. 2. Dry slop - same as above, but moderately or fully dehydrated and therefore ready for reprocessing. 3. Wild slop - slop oils containing significant amounts of light hydrocarbons (the term similar to "wild naphtha"). You can find this category of slop oil in flare knockout drums. Black slops are off spec black petroleum fractions or products, such as atmospheric residue, fuel oil, asphalt; also called heavy slops, they require heating during storage and handling. Vacuum gas oil (brown color), handled in heat traced lines, is usually classified in this category. White slops are off spec white petroleum fractions or products, such as naptha, kerosene, jet fuel; also called light slops, they are handled and stored at ambient temperature. So specific gravity limits for products can (approximately) be: 0.9 & higher for black slops, 0.8 & lower for white slops. Intermediate values (i.e. 0.8-0.9, e.g. diesel, light gas oil) concern a "grey" area (relevant slops are sometimes considered as light ones). Storage & handling of these "intermediate" (term nowhere found) slops, as well as mixing with other slop categories, had better be considered through a HAZOP study (generally recommended by practices for any slop system). Slops of crude are mixtures of all mentioned slops, so they cannot be classified as above. Terms heavy / light (or black / white) slops do not seem to have been strictly defined, so differences of understanding may exist from refinery to refinery or place to place. However above hopefully complies with this thread. Clarification should have been tried by me earlier.
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crude slops
Transcript of Slops
Slop oils are off-spec products, originating either from process units (e.g. during startups, shutdowns, or upsets), or from the tankfarm (slop oils made by tank cleaning, line purging/service switch etc.)Slop oils are usually re-processed within basic refinery units (CDU) and recovered as such.
The terminology may vary from place to place. Refering to your post, these could be:
1. Wet slop - containing significant amounts of dissolved and emulsified water, making this batch unsuitable for reprocessing.2. Dry slop - same as above, but moderately or fully dehydrated and therefore ready for reprocessing.3. Wild slop - slop oils containing significant amounts of light hydrocarbons (the term similar to "wild naphtha"). You can find this category of slop oil in flare knockout drums.
Black slops are off spec black petroleum fractions or products, such as atmospheric residue, fuel oil, asphalt; also called heavy slops, they require heating during storage and handling. Vacuum gas oil (brown color), handled in heat traced lines, is usually classified in this category.White slops are off spec white petroleum fractions or products, such as naptha, kerosene, jet fuel; also called light slops, they are handled and stored at ambient temperature.So specific gravity limits for products can (approximately) be: 0.9 & higher for black slops, 0.8 & lower for white slops. Intermediate values (i.e. 0.8-0.9, e.g. diesel, light gas oil) concern a "grey" area (relevant slops are sometimes considered as light ones). Storage & handling of these "intermediate" (term nowhere found) slops, as well as mixing with other slop categories, had better be considered through a HAZOP study (generally recommended by practices for any slop system). Slops of crude are mixtures of all mentioned slops, so they cannot be classified as above.Terms heavy / light (or black / white) slops do not seem to have been strictly defined, so differences of understanding may exist from refinery to refinery or place to place. However above hopefully complies with this thread. Clarification should have been tried by me earlier.
