LEAKAGE TEST OF WATER PIPELINE
In a water pipeline where flow is generated by pressure leakage test is a very important thing, because if there is any leakage in pipeline system it may cause a serious damage. This leakage test is done by generating pressure for certain segment of a pipeline system. When test result is acceptable for different segment then test is performed for the total pipeline at a time. This article is mainly focused on the leakage test for a one kilometer ductile iron pipeline of 1200 mm diameter.
To perform the leakage test we have to follow some steps which are briefly described below;
First, we have to close the both sides of pipe by a pipe end cover. This end cover should be equally inserted all around the pipe and the joint should be mechanical type.
In the pictures workers are installing a end cap and jointing it with nuts and bolts ensuring no gasket failure. This operation should be done on both side of the segment.
Second, we should provide support on the cap.At first, we have to place heavy precast concrete section and then cast the gap between the precast section and the sheet pile with concrete. We can use H-beam, 150 ton jack to provide this support based upon the pressure. During placing the beam and jack any gap in the joint will not acceptable because when pipe will under pressure there will be a possibility of displacement due to the gap.
In the picture workers are installing precast slab and providing support. This procedure should be followed on both side of segment.
Third, we will joint a GI pipe with the end cap (There is provision of pipe connection and gate valve on the end cap). Then attach the flow meter and pressure gauge with the GI pipe. During connection check the joint properly and make it leakage free. A pressure pump should also need to connect with the pipe by which pressure will be generated inside the pipe. If there is any air valve within the segment of leakage test we have to open it during water filling inside the DI pipe.
In the pictures a worker is showing how to connect the GI pipe and other connections for leakage test.
At last when the pipe will be filled up with water generate pressure by pressure pump as per requirement. During pressure rising it is important to check all open connecting at every time because any failure may cause serious damage and it is prohibited to let enter any third party in the working area. Here I described one method of leakage test. If there is any other method I will appreciate if you share with me.
To perform the leakage test we have to follow some steps which are briefly described below;
First, we have to close the both sides of pipe by a pipe end cover. This end cover should be equally inserted all around the pipe and the joint should be mechanical type.
In the pictures workers are installing a end cap and jointing it with nuts and bolts ensuring no gasket failure. This operation should be done on both side of the segment.
Second, we should provide support on the cap.At first, we have to place heavy precast concrete section and then cast the gap between the precast section and the sheet pile with concrete. We can use H-beam, 150 ton jack to provide this support based upon the pressure. During placing the beam and jack any gap in the joint will not acceptable because when pipe will under pressure there will be a possibility of displacement due to the gap.
In the picture workers are installing precast slab and providing support. This procedure should be followed on both side of segment.
Third, we will joint a GI pipe with the end cap (There is provision of pipe connection and gate valve on the end cap). Then attach the flow meter and pressure gauge with the GI pipe. During connection check the joint properly and make it leakage free. A pressure pump should also need to connect with the pipe by which pressure will be generated inside the pipe. If there is any air valve within the segment of leakage test we have to open it during water filling inside the DI pipe.
In the pictures a worker is showing how to connect the GI pipe and other connections for leakage test.
At last when the pipe will be filled up with water generate pressure by pressure pump as per requirement. During pressure rising it is important to check all open connecting at every time because any failure may cause serious damage and it is prohibited to let enter any third party in the working area. Here I described one method of leakage test. If there is any other method I will appreciate if you share with me.
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