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Slug catchers can be used continuously or on-demand. A slug catcher permanently connected to the pipeline will buffer all production, including the slugs, before it is sent to the gas and liquid handling facilities. This is used for difficult to predict slugging behaviour found in terrain slugging, hydrodynamic slugging or riser-based slugging.
In fluid mechanics, slug flow in liquid–gas two-phase flow is a type of flow pattern. Lighter, faster moving continuous fluid which contains gas bubbles - pushes along a disperse gas bubble. [ 1 ] [ 2 ] Pressure oscillations within piping can be caused by slug flow. [ 3 ]
The Southern North Sea pipeline reception and gas treatment facilities include the following. [4] A pig receiver and slug catcher. Vapour from the slug catcher is cooled and chilled in a gas-to-gas heat exchanger, then by a refrigerant system, and a Joule-Thomson pressure reduction valve before the, now two-phase, mixture passes to a separator.
A cleaning pig for a 710-millimetre (28 in) oil pipeline. The blue plastic disks seal against the inside of the pipe to propel the device and to remove loose sedimentation or scale buildup. The black rectangles at the top and the circular disks in the center are magnets to attract and remove any loose metal objects in the pipe.
Slug flow is where large frothy waves of liquid form a slug that can fill the pipe completely. These slugs may also be in the form of a surge wave that exists upon a thick film of liquid on the bottom of the pipe. Elongated bubble flow consists of a mostly liquid flow with elongated bubbles present closer to the top of the pipe.
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A slug catcher is a type of vapor–liquid separator that is able to receive a large inflow of liquid at random times. It is usually found at the end of gas pipelines where condensate may be present as slugs of liquid.
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