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UDC 628.14
Trukhin I. A., Murashev S. V., Il'ichev S. V.
Water stand posts: operation experience and advanced technical solutions
Summary
At present about 2.5 thousand water stand posts (mainly KV-4) are operating in the water distribution network of SUE «Vodokanal of St. Petersburg». Their maintenance is complicated by freezing in winter and uncontrolled water consumption. To improve the reliability of water stand posts Okkervil model was designed. A ball valve is used as a shutoff valve. Substituting steel pipe with a plastic one provided for the substantial reduction of the risk of water freezing over the inner surface of the feeding pipe. Improving the design provided for eliminating ejector moveability. The new design lacks sealing rubber rings; the stand post lever force at turning on is reduced. The new fixed ejector has a double seal at the connection to the stand post body. Okkervil water stand posts were tested during two years in the water distribution network of the Primorsk district of St. Petersburg, and starting from December 2012 they have been successfully operating in five cities of the North-Western region of Russia. The advance design of stand posts provides for the reliable operation of municipal and community water networks supplying the residents of houses that lack service pipes.
Key words
water supply network , stop valves , water stand post , ejector , ball valve
