การทดสอบหาจุดรั่วในระบบท่อจ่ายน้ำประปาโดยวิธีทดสอบเป็นขั้นตอนแบบวิธีปิดและเปิด

บทคัดย่อ

Close-and-open method is one of step testing. The advantage of this method is its short time for finding leak points. Before applying this method, all boundary valves of a surveyed area must be closed so that there is only one inlet point supplies water into the area.  A flow meter must be installed at the inlet point.  Then, each step valve will be closed for 5-10 minutes, flow rate will be recorded, and the valve will be reopened. The recorded flow rates of all closed-and-opened valves can be analyzed to find the leak points.  Comparing with the conventional method of Metropolitan Waterworks Authority (MWA) and Provincial Waterworks Authority (PWA), the Close-and-open method consume less time in finding the leak points, the non-revenue water in the networks will be decrease consequently.