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Pigs are also used in oil and gas industries to clean or clear pipelines. Intelligent or "Smart pigs" are used to inspect pipelines to assess their condition and to prevent leaks, which can be hazardous or harmful to the environment. They usually do not interrupt production, though some product can be lost when the pig is removed.
Today pigs are used during all phases in the life of a pipeline for many different reasons. Fig. 1 Cleaning pig in a pipeline Fig. 2 Classification of pipeline pigs. Pigs used today can be divided into three categories (Fig. 2): Utility Pigs, are used to perform functions such as cleaning, separating, or dewatering.
Ice pigging is a technique used for cleaning pipes, distinguished from traditional pigging by the use of a semi-solid 'pig' made of ice, rather than a solid object. This ice pig is capable of flowing through pipes, navigating obstructions such as valves and variations in pipe diameter, due to its fluid-like properties.
And clean! Pigs are a lot cleaner than we give them credit for too. Most pigs have excellent long-term memory and can learn from either positive or negative experiences. Studies have even found ...
Passive cleaning bodies may be a matter of brushes or special constructions like scrapers or so-called "pigs", for instance, which are conveyed through the tubes by means of pressurized air, water, or other media. In most cases, cleaning is implemented through the oversize of the cleaning bodies compared to the tube inner diameter.
Pipeline Filling (Flooding) – which can be carried out by propelling pigs through the pipeline with water or free flooding with water (normally for smaller or unpiggable pipelines). Hydrotesting – this is a process by which the pipeline in question is pressure tested to a predefined pressure above the operating design pressure of the pipeline.
Image credits: LittlestSlipper55 When you look around, you might be surprised how many things have names that can really mislead you. Take guinea pigs, for example.
Unlike manure produced in a conventional farm, CAFO manure cannot all be used as direct fertilizer on agricultural land because of the poor quality of the manure. [citation needed] Moreover, CAFOs produce a high volume of manure. A feeding operation with 800,000 pigs could produce over 1.6 million short tons (1,500,000 tonnes) of waste per year ...