Problems with pressure testing vertical containers
Thread Content
For taller vertical containers, when conducting a hydrostatic test (with the container in a vertical position), should the pressure reading be based on the gauge at the lowest point or at the highest point? Considering the pressure of the liquid column, the pressure should be higher at the bottom, but by our standards, gauges are installed at the top of the container. Please discuss this!
Determine the test pressure location based on the design pressure location.
Based on the top portion, during the pressure resistance check, the program takes into account the static pressure of the additional liquid column, but this is not reflected in the test pressure.
This post was last edited by SDHZZXM on 2016-12-24 08:53. Since the pressure is high on the lower side, the pressure gauge should be installed on the upper side to show the lower pressure... Only in this way can the purpose of the pressure test be achieved.
As required, the pressure gauge should be at the top
The pressure gauge is installed at the top; when performing pressure verification, the liquid column pressure is already taken into account in the bottom head
The concept of design pressure refers to the maximum pressure specified at the top of the container. The pressure required for the pressure resistance test is obtained by multiplying the design pressure by a certain coefficient, and this test pressure should also be the pressure at the top. When using SW6 for calculations, a maximum pressure allowed for the voltage withstand test is determined. If the test pressure plus the hydrostatic pressure of the liquid column is less than this value, it indicates that the system is safe. By the way, for spherical tanks, during the hydrostatic test, it is required to install a pressure gauge at both the top and bottom. However, the test pressure is based on the reading of the pressure gauge at the top of the spherical tank.
The pressure for the pressure test is determined by the design pressure (or maximum allowable operating pressure) and the design temperature; both the design pressure (and maximum allowable operating pressure) are defined as the highest pressure applied at the top of the container. Therefore, during the vertical container (upright installation) test, the pressure gauge used for reading should be installed at the top. At the same time, you can also install a comparative pressure gauge at the bottom for reference. When performing a hydrostatic test on a vertical container (in a horizontal position), the static pressure of the liquid column in the equipment must be added to the original test pressure; the test pressure must be adjusted accordingly before carrying out the hydrostatic test. (Of course, if the hydrostatic pressure of the liquid column is less than 5% of the design pressure, it can be ignored.)
“(Of course, if the hydrostatic pressure of the liquid column is less than 5% of the design pressure, it can be ignored.)”? Where is such a rule? However, when considering the load and setting the design pressure, there is such a regulation...
It is indeed when considering the load. Typed it wrong.