These Launchers and Receivers have been designed and fabricated by EN-FAB, Inc for placing at strategic points along a pipeline for pipeline inspection and cleaning.

El lanzamiento y recepción de esferas o diablos, requiere dispositivos especiales a la entrada y salida de los ductos a ser intervenidos (Pigged). Un sistema de envío/recepción de diablos (pigs) consiste de Barril de lanzamiento/recepción, tapa de apertura rápida, válvulas, indicadores de presión, tees de desvío, patín, drenes y equipo para manejo del dispositivo de limpieza (pig).

http://www.en-fabinc.com/es/launchers_receivers.shtml

Pig launchers and pig receivers are installed on pipelines to launch and receive pipeline pigs, pipeline spheres and pipeline inspection tools. Pig launchers & pig receivers offer a safe and effective means of inserting and removing pipeline pigs to and from pipelines. Pipeline Engineering fabricates pig launchers and pig receivers to meet the specific requirements of a pipeline.

http://www.circorenergy.com/pipeline-solutions/pig-launchers...




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Note added at 39 mins (2014-06-27 22:00:13 GMT)
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These operations include but are not limited to cleaning and inspecting the pipeline. This is accomplished by inserting the pig into a 'pig launcher' (or 'launching station') - an oversized section in the pipeline, reducing to the normal diameter. The launcher / launching station is then closed and the pressure-driven flow of the product in the pipeline is used to push it along down the pipe until it reaches the receiving trap – the 'pig catcher' (or 'receiving station').

http://en.wikipedia.org/wiki/Pigging

Pig launchers and receivers are commonly used in upstream oil and gas industry for periodic cleaning of pipelines carrying crude oil, natural gas and water from oil wells. A pig is a bullet shaped object which fits the pipeline from inside. The pig launcher launches the pig into pipeline and the upstream pressure pushes the pig to other end of the pipeline where it is received by the pig launcher. Hence generally arrangement for pig launchers and receivers are essentially the same, except for the difference between ‘Kicker line’ position for launchers and receivers. The sample drawing presents this general arrangement common to pig launchers and receivers.

http://www.enggcyclopedia.com/2011/04/typical-pid-arrangemen...



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Note added at 43 mins (2014-06-27 22:04:18 GMT)
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http://www.proz.com/kudoz/spanish_to_english/construction_ci...