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the pipe is creating an' unusual loss of head with a subsequent drop in <br />capacity. Some of these conditions which immediately come to mind are: <br />1. A partially closed valve in the line, <br />2. A foreign object lodged in the line causing a partial blockage. <br />3. An improperly operating air relief valve causing an air block <br />at a high point and restricting flow. <br />4. Heavy sand deposits in low areas causing a line restriction. <br />5. An interior pipe surface much rougher than normally anticipated. <br />A search of all available records plus inquiries to personnel in the <br />Water Department fail to show the existence of more than one valve in this <br />line. This valve has been located east of the Buckhorn crossing and uncovered <br />for investigation. The pressure drop across this valve was found to be of no <br />measurable magnitude. The chances of some foreign object in the line are <br />most remote. All air valves were checked aad are in operating conditions. <br />Sand deposits in low areas is a possibility as is the fact that the interior <br />pipe surface is not as ideal as we expected. In the case of the latter con- <br />dition, nothing can be done to improve the flow characteristics except lining <br />the pipe, which is quite expensive. We made some pressure checks at service <br />points during a period of constant pipeline delivery in an attempt to find a <br />localized point of pressure drop. Nothing was discovered during these tests <br />to indicate such a blockage by local grit deposits. <br />It is our opinion that the frictional losses occurring in this pipeline <br />are due to rough interior surfaces, possible small grit deposits and the head - <br />consuming fitting arrangement at the storage tanks. <br />CAPACITY OF TRANSMISSION SYSTEM "B" <br />Transmission System "B" is comprised of a 12 -inch cast iron pipe, a 24- <br />- 24 - <br />