The Douty seal is basically an O-ring around the pig; it helps create a flexible seal within the pipeline around the Pig Barrel. It has to be a flexible seal to allow for slight imperfections in the pipe diameter, otherwise the Pig could become permanently lodged in an area with a slight imperfection in the pipe diameter.
How did I do?Can anyone explain about douty seals used in oil and gas pipe line pig barrels?
very high maint.., this guy knows his pigs....Can anyone explain about douty seals used in oil and gas pipe line pig barrels?
I don't recognize the term ';douty seals'; or ';pig barrels'; for that matter.
However you may be referring to the practice of passing a ';pig'; through a pipe or a pipeline to flush the contents through to one end at the completion of a process cycle to recover material left in the line that would otherwise be wasted. The term ';pig'; refers to a projectile that is sized to closely approximate the inside diameter of the pipe. It is launched by a blast of compressed air or other similar means. The line is then cleaned by flushing it with a cleaning agent in preparation for another process cycle.
In pipelines it may be used in a similar way to clean the lines of small amounts of material adhering to the pipe walls that pose a risk of plugging over time if left untended. The pig would be introduced to the pipeline while it continued in service and captured downstream for re-use.
Hope that helps.
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