Fill pipe line with water
For the pressure test, The water filling process was carried out slowly verifying that air is being released from the pipe line. It was very important to make sure that air was actually being released during this process as the pipe line would become dangerous because of the compressed air caused by the insufficient air released.
If water leakage was discovered during this process, the pipe line must be repaired immediately.
The pipe lines were left in the water filled condition at least 24 hours to stabilize the pipe line.
Before applying the specified test pressure, air was that be expelled completely from the pipe, valve, and hydrants. If there was not permanent air vents at high points, the corporation cock was installed at such points so that the air can be expelled from it.
Installed equipment required for pressure test
The necessary equipment for the pressure testing work may be prepared as follows.
- Pressure pump 1 set
- Pressure gauge 1 set
- Pressure recorder 1 set
- Suction hose necessary length
- Connection hose necessary length
- Overflow hose necessary length
- Water tank and water meter 1 set
- Connection pieces 1 set
Perform pressure test on pipe line
Pressurerization
Each valve section of pipe was filled with water slowly and the specified test pressure based on the elevation of the lowest point of the line or section under test and corrected to the elevation of the test gauge. Valves were not
operated in either the opening or closing direction at differential pressures above the rated pressure. Any exposed pipe, fittings, valves and joints were examined carefully during the test. Any damage or defective pipe, joint, fitting, valves that were discovered was repaired.
Leakage tests
If a drop in pressure occurs, the quantity of water added to re-establish the test pressure were carefully measured. This should not exceed 0.1 liters per millimeter of pipe diameter per kilometer of pipeline per day for each 30m head pressure applied.
Drain pipe lines
After the completion of the test, water was drained from the pipe line. If the adjacent pipe section is to be tested, the water may be available for the next test.
Removal of protective work from the ends of test section
Protective work at the ends of the test section was removed when this pipeline is to be connected to an adjacent pipeline. However, when the adjacent pipeline was tested, these same protections may be available for it.
After the adjacent pipe line has been tested, the test section was connected to it.