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Abstract
Tests undertaken to determine friction loss in large asbestos cement pipelines under typical field conditions encountered in water supply systems. The test results are compared with the flow resistance charts recommended for use in design by the manufactureres, James Hardie and Coy. The test results indicate that under the conditions normally encountered in ater supply systems the friction gradients given by the design charts should be increased by about 5 to 10 percent to to allow for ageing and variations in pipe characteristics during laying in the field.