Yokohama Waterworks Commemoration Hall / Joint and steelpipe
Yokohama was the first city in Japan in which a modern waterworks system was constructed. The Yokohama Waterworks Commemoration Hall and Waterworks Technology Commemoration Hall displays materials and videos that present how Yokohama's waterworks system was developed. (For more information, see the February 2010 issue of the PR magazine pla-topia.) http://www.city.yokohama.lg.jp/suidou/kyoku/torikumi/suidou-pr/kinenkan/
Of the components comprising the water feed system, the resin-coated joints are made from plastics. The internal and external surfaces of the joints are coated with an epoxy resin to prevent rust. Hard polyvinyl chloride-lined steel pipes, steel pipes with an inner coating of resin, are used. However, the screw-type connections of these pipes have an exposed metallic portion. A plastic core is inserted into the exposed metallic portion to prevent direct contact with water. For steel pipes for tap water, pipes lined with hard polyvinyl chloride or polyethylene powder are used.
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Types of water meters | |
Plastic parts making up a tangential-flow-impeller water meter |
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Current tangential-flow-impeller type | |
Auxiliary stop cock |