This appraisal is for a range of kwik-ZIP® HDX and HDXT casing spacers that are used to maintain the position of a carrier pipe (watermain or sewer) within an encasing pipe for pipe-in-pipe applications such as slip lining and cased crossings. This Issue 3 is to add the range of HDXT casing spacers to this Appraisal.

The system can be used for medium to heavy weight pipe materials including steel, ductile iron, GRP, FRP, concrete, PVC and PE and is suitable for both pressure and non-pressure pipelines in grouted and un-grouted installations.

The casing spacers utilise a segmented design that allows the system to be used on a range of carrier pipes from 100mm OD to 3000mm OD. The components of the spacer are manufactured from injection moulded inert engineering thermoplastics that incorporate low friction high abrasion resistant wear pads, attached to load sharing runners. The number of segments required for each spacer is determined by the outside diameter of the carrier pipe.

The HDX casing spacers are offered with four runner heights: 38mm, 65mm, 90mm, and 125mm and are suitable for carrier pipes with outside diameters from 100mm to 1668m.

The HDXT casing spacers are offered with five runner heights: 43mm, 58mm, 63mm, 103mm, and 153mm and are suitable for carrier pipes with outside diameters from 300mm to 3000mm. The HDXT spacers have a longer segment length and at least 50% greater load capacity per runner than the HDX spacers.


Product categoryCasing Spacers
PA NumberPA 1523 Issue 3
Report holderKwik-Zip Pty Ltd
StandardWSA PS 324 Casing Spacers
Publication date
Expiry date

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PA 1523 Issue 3 - WSAA Certificate - Kwik-Zip - kwik-ZIP HDX and HDXT Casing Spacers-Final.pdf PDF