Hot Water # 2006 Washington DC
For more than twenty years, CPVC compounds have been used to produce single-layer, allplastic tube and pipe for the Plumbing, Fire Sprinkler, and the Industrial Piping markets. Due to market changes, expansions, and the inherent limits to the single-layer product, a completely new, engineered piping system had to be developed to augment Noveon’s product portfolio. Incorporating the properties of CPVC tube and pipe with the advantages of metal tubing, a CPVC/Metal/CPVC Composite Piping System proved to meet the marketing demands and the testing requirements. This paper will present technical aspects in the development of the composite pipe engineered system. Equipment challenges, such as modified die channels and specially designed cross-head dies, to meet the thin wall CPVC tubing requirements and the shear sensitivity of the compound will be discussed. Metal forming and welding equipment had to be identified and demonstrated for the strict standards needed with the CPVC tube. Various types of equipment and system differences will be explained. Experimentation and product development optimizing multi-layer dimensions were balanced to accommodate testing and market requirements While continuing with the development of the CPVC/Metal/CPVC pipe, the engineered system had to include incorporation of the solvent cement fitting. New designs for the fitting system will also be presented. Discussions will concentrate on physical property data of the composite pipe, long-term stress rupture data, and testing requirements for assembly systems. Copyright 2006 The Lubrizol Corporation. All rights reserved. Reproduction in whole or in part, in any form or medium without express written permission is prohibited.