Methods for joining metal-plastic pipes

Reinforced plastic pipes are connected only with fittings.

Instruments

  1. Pipe cutter.

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This tool is required for a good cut of the pipe.

  1. Calibrator.

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This tool is required to machine the inside of the slice.

  1. Chamfering tool

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This tool is required to machine the outer edge of the cut.

  1. Adjustable wrench.

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  1. Plumbing pliers for fixing fittings.

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  1. Press pliers.

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Compression fittings

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A compression fitting is a collapsible part consisting of a body with a union, an O-ring, and a compression nut. For connection, adjustable or wrenches are used.

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The resulting connection is collapsible, which means that it must be checked.

Step-by-step instruction:

  1. Cut the pipe to the required length.

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When using scissors to cut a metal-plastic pipe, you must first thread the blade of the scissors into the pipe, turn the scissors half a turn around the pipe, and then cut the pipe. This is to avoid deformation of the pipe during cutting.

  1. Prepare the pipe for the connection using a calibrator and chamfer.

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If necessary, wipe the inside and outside of the pipe with a rag.

  1. Unscrew the compression fitting (remove the compression nut and split ring).
  2. Slide the compression nut onto the pipe, then slide the compression ring.
  3. Insert fitting into the pipe as far as it will go; turn the fitting if necessary.
  4. Slide the ring towards the nipple and secure the connection with the nut and wrenches. Tightening the crimp nut is done with two wrenches. The fitting is fixed with one; the nut is tightened with the other.

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Press fitting connection

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Instead of a nut, a crimp sleeve is used when connecting to press fittings.

Step-by-step instruction:

  1. Cut the pipe to the required length.

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When using scissors to cut a metal-plastic pipe, you must first thread the blade of the scissors into the pipe, turn the scissors half a turn around the pipe, and then cut the pipe. This is to avoid deformation of the pipe during cutting.

  1. Prepare the pipe for the connection using a calibrator and chamfer.

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Wipe the inside and outside of the pipe with a rag if necessary.

  1. Remove the metal sleeve from the press-fitting.
  2. Put the sleeve on the prepared end of the pipes and insert the fitting into the pipe.
  3. Slide the sleeve towards the fitting and clamp the connection with pliers until the handles of the pliers are fully engaged.

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If you are using manual crimping jaws, you need to crimp the joint twice. After pressing the first time, it is necessary to remove the tongs, turn the tongs relative to the joint by 30 degrees and re-crimp the joint.

Push-fitting connection

When connecting reinforced-plastic pipes with push-fitting, no additional tools are required.

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Step-by-step instruction:

  1. Cut the pipe to the required length.

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  1. Prepare the pipe for the connection using a calibrator and chamfer.

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Wipe the inside and outside of the pipe with a rag.

  1. Insert the pipe into the push fitting.

The connection is hermetically sealed and can be used for hidden piping. Withstands pressure of 10 atmospheres.

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