Product Description

Acu-Tech Piping Systems manufactures custom fabricated poly tees in Perth, Western Australia. 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 HDPE tees, and can also manufacture tees to suit your requirements.

What is the difference between Pull 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:

Acu-Tech Fabricated Pipe Fitting Custom Tees

Pull-Tees – Reducing Tees.

Pull tees, or necking tee’s are manufactured by cutting a hole in the side of a piece of poly pipe, and pulling a die through to form an opening that can be welded on to. Pull tees are also known as 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 pull tees with routered edges, made by Acu-Tech from HDPE 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.

Acu-Tech Fabricated Pipe Fitting Custom Tee with Flanges
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.

HDPE Fabricated White Tee
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 HDPE 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 HDPE 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.

Acu-Tech is a Perth supplier of Extrusion Welded Poly Tees in Australia
Extrusion Welded Tees or Custom Made Poly Tees

Extrusion welded tees or custom made poly tees, are cut from HDPE 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 HDPE 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.

Contact Acu-Tech’s sales team for more information, and a technical specialist on HDPE tee fabrication will be able to help you further.

With a fully equipped plastic fabrication workshop and experienced and qualified operators, Acu-Tech Piping Systems fabricates spools and components from pipe and sheet to client specifications.

Our extensive HDPE fabrication capabilities includes sweep bends, junctions, true y pieces, equal and reducing tees, PE surge tanks, cross pieces, custom HDPE spools, high pressure fittings, splash boxes, manifolds, launders, junctions and segmented bends ranging in size from 25 mm – 800 mm.  HDPE tees may also be known as poly teas by mistake. For any other requirements and for fabricated items that are less common and not mentioned our catalogue, feel free to contact us and we will gladly assist.

See photos and more information about our custom PE fitting fabrication at

Helping You

If you need advice or guidance, we’re here to help.

Acu-Tech Piping Systems’ sales team have extensive experience in supplying fabrication services. We encourage you to tap into this wealth of knowledge for advice and guidance. Our sales office is ready to take your call on 08 9238 8000 and will ensure that your enquiry is dealt with promptly. Alternatively, to send a message please click here.

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