The operation of a foam pig may be affected by the following factors:
Pipeline ovality: Submarine pipelines may be bent due to the peculiarities of laying, resulting in elliptical pipe sections. The elliptical subsea pipeline may reduce the contact area with the pig, which will affect the sealing effect and cleaning effect.
Pig interference: The interference of the foam pig refers to the relative size difference between the pig and the pipe, and the amount of interference will affect the contact stress and contact area, which in turn will affect the cleaning effect. The larger the interference, the better the cleaning effect, but too much interference may cause the pig to jam, and too small the interference may affect the cleaning effect.
Pipe wall friction: friction will cause uneven distribution of contact stress, and the more severe the friction, the more uneven the stress distribution. The contact stress increases nonlinearly with the increase of friction factor, and the average contact stress on the contact surface increases with the increase of friction on the pipe wall.
Foam density: The density of the foam pig will affect the size of the contact stress, but it has no effect on the distribution of the contact stress.
Dirt on the inner wall of the pipeline: When there is dirt on the inner wall of the pipeline, the cleaning results of the pig with different interference amounts will be different, which will affect the pigging effect.
Water quality problems: When using foam pigs, there may be water quality problems, which can affect the cleaning effect.
Environmental factors: such as temperature, pH value and other environmental factors will also affect the working effect of the foam pig.
The combination of these factors determines the application effect and cleaning ability of the foam pig in practical work.
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