This paper starts with a short overview about why pigging of pipelines is done as well as discussing the different types of scrapers and spheres and how they are used (i.e. drying, cleaning, separation, gauging, inspection etc). Afterwards a general overview is given about different methods of launching and receiving pigs in high pressure pipeline systems. The pros and cons of pig trap installation in comparison to the pros and cons of special valves are then presented. The next section presents and discusses different types of so-called high pressure pig valves which are currently available. The discussion will be focussed on safe operation and handling of these special valves. Finally, examples of field installations are presented. Note: This paper focusses on high pressure pigging systems as found in the oil and gas industry. Additional methods are available, especially for low pressure applications.
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