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3.17 HYDROSTATIC TEST OF PIPE CLASS I 3.17.1 Defenition
Hydrostatic test is a test to verify the structural adequacy of the design and the tightness of the pipe structure by means of water pressure.
3.17.2 Requirements Based on ABS Rules 4-6-27.3 about Hydrostatic Tests
3.17.3 Equipments and Function a.
Pressure Testing Pump
The function of pressure testing pump is to to supply air pressure into the pipe. The capacity of the pump depend on the the testing pressure value must be greter than testing
pressure
Figure 82 : Pressure Testing Pump b.
Pressure Gauge
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The function of the pressure gauge is to display of air pressure value used during the test. Surveyor should be check the certificate of the pressure gauge is used, because it
involves feasibility. Pressure gauge connect to the pressure testing pump.
Figure 83 : Pressure Gauge c.
Chart
The function of Chart is similiar with pressure gaug and should be checked certificates. but the difference between the two lies in the position. The different lies in its
position. If the pressure gauge connet to the pipe and installed near the pipeline. As for the chart, is also connect to the pipe, but the position was placed about 5 meters of the pipe.
Actually, the use of charts in hydrostatic test for pipe class 1 is for safety reason. Because the pressure used during the test is high, then checking the conformity of pressure based on the
design testing and pressure testing can be done at a relatively far distance 5 meters. In addition to the value of pressure used, in the chart there is also a testing time
Figure 84 : Chart
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3.17.4 Procedures
1. To connect between pressure gauge, pressure testing pump and chart.
Figure 85 : The Circuit of Pipe During Hydrostatic Test
2. Fill in pipe with the water. 3. Fill in pipe with the water high air pressure. Capacity pressure used depends on the design
of pressure value and test pressure value. Pressure values used can be seen on the chart.
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Figure 86 : The Pressure on Chart
4. Wait for see the result minimum 5 minutes. If the pipe is able to withstand the pressure exerted, the pipe structure will not be changed example bent and leak. In addition, if the
pressure value on the chart has not changed decreased then it is certain that the pipe does not leak.
3.17.5 Result and Conclusion of Survey
From the result visual inpection of Hydrostatic Test, not found changes in the pipe structure. Beside that, the value of chart don’t change. Base on situation that, it can be
ascertained that the pipes do not leak.
Figure 87 : The Complete Result of Testing
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3.18 DAVID LOAD TEST 3.18.1 David Load Test Details
