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Concrete In Australia : June 2008
Concrete Pipe Association of Australasia Designers AnD sPeCifiers – UnDersTAnD THe risK! Stormwater drainage systems, and in particular, pipelines, have traditionally been designed by experienced local government engineers who have had limited choice in the materials and concepts available to them. Things have changed dramatically over the last twenty years! This in turn has created a number of challenges. These include the skills shortages in industry, the outsourcing of designs to inexperienced designers, the arrival of different pipe materials and with this different design and installation concepts. Despite these changes the one thing that has remained constant is the basic role of the design engineer. Their position should be to always take engineering analysis into consideration, whilst aiming to acheive the desired outcome of the project. In stormwater drainage design, this means providing a durable system that offers best value to the owner, whilst protecting the health and safety of the user. Before making any final recommendation to the client, the engineer has a responsibility to analyse life cycle costs, the risks associated with the chosen pipe product, as well as any other risks that may be identified during the selection of pipe materials. It is important for specifiers to understand the design requirements for any particular pipe material before specyfing. Different materials, their service lives, and their maintenance requirements vary greatly. Added to this, the engineer has a legal responsibility to ensure that the product specified shall perform for the design life of the project. Therefore, it is important that before specifying a particular product the engineer must be aware of the characteristics, applications, potential deficiencies, and limitations of the product. To begin with it is important to undertand the differences that exist between pipe materials before selecting the type of pipe to be used in a project. The performance expectation of the specified product must be reviewed and evaluated using available literature to ensure that the proper considerations are being made. The engineer must take care to distinguish a manufacturers claims from facts regarding any particular product. It is not unreasonable to expect the design engineer to have an understanding of the most recent pipe standards to ensure that the structural design considers all aspects of the pipeline required, as well as the implimenting any recommendations outlined. Some pipeline materials require time consuming and diligent installation to ensure the service performs adequately. As such specifiers may need to be involved in the construction activities to ensure the pipe is being placed correctly to impliment the design. The engineer should also take responsibility to ensure that appropriate acceptance protocol be followed with recommendations for checks and testing after the pipline has been installed. Design of any pipeline system requires knowledge of material properties, installation conditions, and external loads. All of these factors combine to define the behaviour of the installed pipe. The engineer can reduce the risk of failure by understanding the material that is being considered for the pipeline! Concrete Pipe Association of Australasia What caused this failure ?Was the pipe designed and installed appropriately ? Understanding installation requirements is an important part of the design The Australian and New Zealand Standards for reinforced concrete pipe are AS/NZS4058 “Precast Concrete Pipe” and AS/NZS3725 “Design for installation of buried concrete pipe”. Used appropriately, reinforced concrete pipe can be designed for 100 yrs. To purchase you copy go to the CPAA web site www.concpipe.asn.au and order your copy today. Locked bag 2011 St Leonards NSW 1590 Ph: +61 2 9903 7780 Fax: +61 2 9437 9478 Email: email@example.com Web: www.concpipe.asn.au