PIPE PIGGING

PIPE PIGGING

The pigging of pipelines is a reliable and elaborate procedure for pipeline cleaning but contains the risk that the device gets stuck in the pipe.

CLEANING OF POTABLE WATER PIPELINES

Das Molchen von Leitungen ist ein altbewährtes Verfahren, das zufriedenstellende Ergebnisse erzielt, bei dem aber ein gewisses Risiko besteht, dass ein eingebrachter Molch in der Leitung stecken bleibt.

Daher wird heutzutage eher selten, in erster Linie im Rahmen von Druckprüfungen gemolcht, um Restluft aus den Leitungen herauszudrängen oder um neue Leitungen für die Desinfektion vorzubereiten.

PIG TYPES

There are basically three different types of pigs with different hardness. Within each group, they are divided into about 15 different types for different applications. The pig can be bigger than the pipe up to a max. of 5%. It works like a hydraulic ram in the particular medium (e.g. water). Even longer line sections can be cleaned with pigs but it takes a relatively long time because the speed is 0.5 – 1.0 m / s.

FOR PVC AND PLASTIC PIPES

  • SW = swab, foam rubber coated with polyester, very soft pig
  • DF = dura-form foam rubber coated with polyurethane, medium / hard pig
  • XX = criss-cross Polyurethane plastic with DF
  • SH = splitted DF for steel and castings

FOR STEEL AND CAST IRON PIPES

  • WB = wire-brush XX integrated steel core
  • St = stud-big XX integrated steel hooks
  • Others: as for PVC and plastic pipes

PROCEDURE

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