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Irrigation pipes

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Irrigation pipes form the permanent runs of an irrigation system. Choose them only once the route, zones, flow requirements and connection system have been established; a diameter alone does not define a complete system.

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Plan the pipe layout before listing materials

Draw the source, main line, branches, valves and endpoints to scale or with lengths marked. Mark changes in elevation, paths, roots and points that must remain accessible later. Every bend, branch and restriction affects the system. For long or heavily branched runs, pipe sizing should be professionally calculated based on the required flow and permissible pressure losses.

Planning area What to document Why it matters
Pipe External and internal dimensions specified for the system, material, permissible operating range Connectors and hydraulic calculations rely on defined dimensions
Connections System, insertion depth, seal, assembly instructions Similar diameters are not automatically compatible
Route Length, elevation, bends and branches Determines pressure loss and material requirements
Maintenance Isolation, drainage, flushing and testing points Makes commissioning and seasonal maintenance easier

Do not equate pipe dimensions with thread sizes

Depending on the type of pipe system, the stated dimension may refer to the external or internal diameter. Threads follow their own standards and naming conventions. Always take dimensions from the system specifications for the exact pipe and connector. Mixed installations require explicitly compatible adapters; “almost the same” does not provide a reliable fit for sealing surfaces and push-fit connections.

Before backfilling the trench

  • Clean and prepare pipe ends as instructed
  • Fully assemble connections and flush the line
  • Check the section for leaks under the intended operating conditions
  • Keep valves, filters and detachable adapters accessible
  • Photograph the pipe route and record dimensions for future work
  • Implement frost protection and drainage measures according to the manufacturer's instructions and system requirements

For zones and end devices, visit Irrigation systems and accessories. Find suitable adapters under Irrigation fittings and connections; for the winter shutdown, see Winterising your garden irrigation system.

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