Leakage Prevention Guidebook - Bureau of Waterworks Tokyo ...
Leakage Prevention Guidebook - Bureau of Waterworks Tokyo ...
Leakage Prevention Guidebook - Bureau of Waterworks Tokyo ...
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ContentsPage1 Outline <strong>of</strong> leakage prevention 11.1 Present situation 11.2 Necessity <strong>of</strong> leakage prevention 22 Countermeasure <strong>of</strong> leakage prevention 42.1 System <strong>of</strong> leakage prevention measures 42.1.1 Planned replacement <strong>of</strong> water pipes 5and improvement <strong>of</strong> materials for pipes(1) Distribution pipe replacement (aged pipes, 5early ductile iron pipes, etc.)(2)Integration <strong>of</strong> service pipes under the 6private road and replacement with sub mains(3)Reinforcement <strong>of</strong> seismic resistance <strong>of</strong> 6large-diameter service pipes(4)Material improvement work <strong>of</strong> service pipes 62.1.2 Early detection and repair work for water leakage 7(1)Planned work 7a Patrol work(Circulating checking) 8b <strong>Leakage</strong> volume measurement work 8c <strong>Leakage</strong> investigation and measurement work 8(2)Mobile work 92.1.3 Securing high level <strong>of</strong> leak prevention technologies 9(1)Training and Technical Development Center 9(2)Accreditation <strong>of</strong> <strong>Tokyo</strong> waterworks technology 10experts and super plumbers2.2 <strong>Leakage</strong> prevention construction system 103 The method <strong>of</strong> leakage investigation 113.1 Minimum night flow measurement method 113.2 Acoustic method 123.3 Correlation method 13
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