The details of system settings and parameters for testing are shown in Tables 1 and 2, respectively. The transients in the system are generated by the fast and complete closure of the inline valve from initial full open state. The transient data are collected at the two ends of the pipelines (S1 and S2), with S2 used for the calibration of wavespeed of the test pipeline, and S1 (close to the inline valve) for the pipe fault detection and analysis later in this study.
Setting of geometric information
| Number . | Fault and instrument . | Value . | Distance to valve (m) . |
|---|---|---|---|
| 1 | Pressure sensor1 (S1) | – | 1.05 |
| 2 | Blockage1 (B1) | 5 m | 7.05 |
| 3 | Leakage1 (L1) | 3 mm (0.35 L/s) | 16.13 |
| 4 | Junction (J1) | 2 m | 30.22 |
| 5 | Leakage2 (L2) | 4 mm (0.47 L/s) | 44.31 |
| 6 | Pressure sensor2 (S2) | – | 59.39 |
| Number . | Fault and instrument . | Value . | Distance to valve (m) . |
|---|---|---|---|
| 1 | Pressure sensor1 (S1) | – | 1.05 |
| 2 | Blockage1 (B1) | 5 m | 7.05 |
| 3 | Leakage1 (L1) | 3 mm (0.35 L/s) | 16.13 |
| 4 | Junction (J1) | 2 m | 30.22 |
| 5 | Leakage2 (L2) | 4 mm (0.47 L/s) | 44.31 |
| 6 | Pressure sensor2 (S2) | – | 59.39 |
Experimental test condition
| Basic properties . | Value . |
|---|---|
| Pipe material | Galvanized steel material |
| Pipe diameter(mm) | DN40 |
| Calibrated wave speed (m/s) | 1014.10 |
| Sampling frequency (Hz) | 5,000 |
| Closure valve time (s) | 0.2 |
| Initial Reynolds number (Re) | 2.1 × 103–5.1 × 104 |
| Friction coefficient (f) | 0.0135 |
| Tank pressure (mH2O) | 28 |
| Basic properties . | Value . |
|---|---|
| Pipe material | Galvanized steel material |
| Pipe diameter(mm) | DN40 |
| Calibrated wave speed (m/s) | 1014.10 |
| Sampling frequency (Hz) | 5,000 |
| Closure valve time (s) | 0.2 |
| Initial Reynolds number (Re) | 2.1 × 103–5.1 × 104 |
| Friction coefficient (f) | 0.0135 |
| Tank pressure (mH2O) | 28 |