This appraisal is for a range of kwik-ZIP® HDX Series casing spacers 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.
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 HDX casing spacers utilise a segmented design that allows the system to be used on a range of carrier pipes from 100mm OD to 1668mm 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. Spacer runner heights can also be customised by combining different runners together into a single spacer.