Specifications for purging crude oil (fuel oil) storage tanks
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The crude oil (fuel oil) storage tanks that were used in the past need to be filled with light oils (naphtha, diesel, gasoline); it is therefore necessary to perform oil removal and purging operations on the tanks and pipelines. How should this purging be carried out to ensure that the quality standards for storing light oils are met? I would like to ask about the purging medium, the purging steps, the purging specifications, and the precautions for purging. The measures being taken now are water injection and aeration, nitrogen purging, and ball passing with sponge balls. I think it should be hot water for pipe heating and steam for purging.
What are the specific purging steps, purging specifications, and precautions for purging?
Steam purging: Check that the steam pressure is below the design pressure of the pipeline; then open the drain and bleed valves at the lowest points along the pipeline, introduce steam, and gradually remove the liquid. Once the liquid has been removed, close the drain and bleed valves, and finally perform sampling and analysis at the end of the pipeline
This post was last edited by mm280054599 on 2018-12-27 at 22:26. Specific purging steps, purging specifications, and precautions for purging: 1. Without seeing the drawings or visiting the facility, it’s impossible to be certain; if you need to make a decision regarding this, you must thoroughly understand the current condition of the facility yourself； 2. Things to pay attention to generally include: First, what was mentioned on the 4th floor is very important – do not hold back the pressure ； Secondly, the emission point must be kept safe; it should not be directed at equipment or above people’s heads, and in winter it should not be directed at main passageways ； Third, don’t let environmental protection authorities catch you discharging pollutants illegally ； Fourth, ensure proper isolation: install blind flanges where necessary to prevent cross-connection with other processes ； Fifth is to prevent waste steam and waste liquids from flowing back into the steam system ； Sixth, if the unit is located in the north, it is necessary to prevent condensate from accumulating in low-lying areas or storage tanks, as this could cause pipes and equipment to freeze and crack; after all, purging is usually carried out over night ； Seventh, remove the thermometer at the site; due to the high cleaning temperatures, the thermometer may get damaged. The pressure gauge can be replaced with one having a larger range, depending on the circumstances ； Eighth, if you discharge the condensate into the wastewater tank, oil and gas may accumulate in that area; be careful not to perform any welding operations there, nor use pumps that are not explosion-proof for pumping water ； Nine is to check the remote sensors after the rotation, such as level gauges; especially in cases where pressure conversion is used, since the density of the liquid varies, failure to calibrate them can result in inaccurate level readings or even a full tank ； After steam purging, samples taken from each section show satisfactory results; at this point, high-flow air can be used to remove any remaining liquid. Before feeding the material, the pipes can be purged again with nitrogen, and an oxygen level check can be performed to avoid areas prone to explosion ； Eleven is that you need to put in more effort yourself – driving, parking, inspections, and repairs are common; try not to sleep more than six hours a day.