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Poly

Tee Fabrication

WA made custom fabricated poly tees.

Poly tees are used to branch off a pipeline, and are sometimes known as pull tees, spigot tees, moulded tees, welded tees, CNC fabricated tees, equal tees and reducing tees. As a specialist in poly tee fabrication, Acu-Tech stocks the main sizes of PE tees, and can also manufacture tees to suit your requirements. What is the difference between Forge T’s, Spigot T’s, Moulded T’s, Welded T’s, CNC Fabricated T’s, Equal T’s and Reducing T’s?

The different types of poly tees are:

Forge-Tees – Pull Tees

Forge tees, pull tees, reducing tees, or necking tee’s are manufactured by drilling a hole in the side of a piece of poly pipe, and pulling a die through to form an opening that can be welded to a smaller length of poly pipe. Forge tees are also known as pull tees or reducing tees – the off-take is always smaller than the diameter of the original pipe, so it is normally used when a smaller pipeline joins to a larger pipeline. The photo above shows two reducing forge tees with routered edges, made by Acu-Tech from PE pipe. Pull tees are technically known as ‘pull out reducing tee fittings’ or ‘necking tee’s’. Note that pressure de-rating factors apply on pulled tees – see below for more information.

Spigot Tees or Moulded Tees

A spigot tee is usually a moulded fitting, which can have bends, stubs or extra pipe butt-welded to the ends, to form a tee that can be welded or bolted to an existing pipeline. A spigot tee can be an equal tee or a reducing tee, depending on the type of moulded fitting used – Either a spigot equal tee or a spigot reducing tee. The photo above shows a reducing spigot tee with stubs welded on the ends, and backing rings – so the tee can be bolted to a pipeline.

Welded Tees, Segmented Tees, Mitred Tees or CNC-Fabricated Tees

CNC fabricated tees or welded tees, are welded and cut, to form a tee shape. Fabricated tees are always equal tees, as the pipe used for the offtake is the same size as the original pipeline. Welded tees are manufactured from PE pipe, which is cut and butt welded to the specified dimensions. The photo above shows a fabricated tee made from Acu-Therm co-ex white PE pipe. Welded tees are also known as mitred tees, segmented tees or fabricated equal tees. Note that pressure de-rating factors apply on weld tees.

Extrusion Welded Tees or Custom Made Poly Tees

Extrusion welded tees or custom made poly tees, are cut from PE pipe, and extrusion welded to form a tee shape. Extrusion welded tees are usually reducing tees, but can also be made as equal tees. The photo above shows extrusion welded tees made from Acu-Black PE pressure pipe. Note that pressure de-rating factors apply on extrusion weld tees.

HDPE Tee De-rating Information:

Information about de-rating that applies to poly tees is mentioned in the PIPA Document ‘PE Fabricated Fittings For Pressure Applications: De-rating Requirements’: For segmented tees fabricated out of pipe segments cut from pipe complying with AS/NZS 4130, the following de-rating rules for the calculation of the PN shall apply: [PN] = fT x [PN] pipe where f T is the de-rating factor for these tees, having a value of 0.5 [PN] pipe is the nominal pressure of the pipe, taken as a value. Test results of the manufacturer may demonstrate that a de-rating factor > 0.5 may be applicable. Results of testing in accordance to ISO 4427-3 Table B.1, shall determine the applicable de-rating factor fT. For pull out tees, the following de-rating rules for the calculation of the PN shall apply: [PN] = fT x [PN] pipe where f T is the de-rating factor for these tees, having a value of 0.5 (see note below) [PN] pipe is the nominal pressure of the pipe, taken as a value. Note: No direct published reference could be found in relation to accepted de-rating factors for pull out tees. In the absence of published de-rating factors the value of 0.5 was carried over from that applied to segmented tees. The minimum wall thickness of the fitting, shall comply with the requirements of AS/NZS 4130, for the rated nominal pressure of the pipeline. The tee branch outlet spigot end shall be straight for the length required to complete mechanical coupling, butt welding, or electrofusion jointing. Saddle tees: This type of fitting is prepared by electrofusion welding an injection moulded or machined PE electrofusion saddle fitting onto a PE pipe segment. Outlet branches are available in both equal and reduced sizes in accordance to the dimensional requirements of AS/NZS 4130. Branch saddle tees are available for pipe main sizes to DN2000, with outlets to DN500. This type of saddle tee is operated at the pressure rated SDR class for the pipe without the need for de-rating.   

Poly Tee sizes available from Acu-Tech Piping Systems:

  • 20 mm HDPE Tee – Moulded Tee.
  • 25 mm HDPE Tee – Moulded Tee.
  • 32 mm HDPE Tee – Moulded Tee.
  • 40 mm HDPE Tee – Moulded Tee.
  • 50 mm HDPE Tee – Moulded Tee.
  • 63 mm HDPE Tee – Moulded Tee.
  • 75 mm HDPE Tee – Moulded Tee.
  • 90 mm HDPE Tee – Moulded Tee.
  • 110 mm HDPE Tee – Fabricated Tee/ Moulded Tee.
  • 125 mm HDPE Tee – Fabricated Tee/ Moulded Tee.
  • 140 mm HDPE Tee – Fabricated Tee/ Moulded Tee.
  • 160 mm HDPE Tee – Fabricated Tee/ Moulded Tee.
  • 180 mm HDPE Tee – Fabricated Tee/ Moulded Tee.
  • 200 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 125 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 160 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 200 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 250 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 315 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 355 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 400 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 450 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 500 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 560 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.
  • 630 mm HDPE Tee – Fabricated Tee / Moulded Tee / Forge Tee.

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