HDPE / PP Manholes and Chambers complying with the requirements of BS EN 13598-2 : 2009.
Manholes & Chambers are available in various internal diameters ranging from 300mm up to 4000 mm. The typical depths to invert can range from 1 meter to 6 meters and deeper in special cases. These units are provided with required inlet and outlet pipe, benching, lifting lugs and also with PE I PP ladder (if required).
The versatility of UPI’s HDPE I PP manholes & chambers makes them the ideal choice for housing, municipal and industrial applications. The maintenance free material offers following advantages over the conventional types (e.g. Concrete coated I lined, GRP):
HDPE / PP manholes and chambers are manufactured using an automated process of extrusion that is specifically designed to wind extruded material spirally onto a preheated and revolving mandrel. Overlap on the edge is fused homogeneously together while it is in the hot plastic state, producing a smooth internal surface. Once the manhole or chamber body is extruded, it is allowed to cool in open space and therefore subjected to less induced stress. Following this, the manhole or chamber’s base is extrusion welded on the manhole’s body and additionally secured with suitable stiffeners.
Subsequently, manhole or chamber’s fittings and accessories are installed. The sizes and orientation of the inlet and outlet pipes, vent pipe, channel’s slope is customized to customers’ requirement. This allows for more precise installation of these units at site and is time and cost effective. The entire manhole or chamber is then ready to be installed at site without the need for any major additional work to be done at site.
HDPE / PP manholes and chambers are designed to resist the radial and axial loads induced by earth pressure, ground water and traffic loads. Wall thickness and stiffness are determined based on inputs from design consultant / client. Manhole or chamber stiffness should be in compliance with BS EN 13598-2 or other applicable international standard(s). Factors such as installation depth, traffic and area load, ground water table, soil characteristics and other installation conditions should be analyzed. Anti-flotation weight may be incorporated if deemed necessary.
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