Does the hydrostatic test pressure increase on its own?
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This post was last edited by Northwest Wolf on 2011-7-17 21:59. Does the hydrostatic test pressure increase on its own? During the hydraulic testing of the equipment, water was filled in last night and pressure was increased to the test pressure of 0.3 MPa this morning; after that the pressure was held constant while the sealing surfaces of the container were inspected. By 12 p.m., it was found that the pressure gauge indicated 0.35 MPa, an increase of 0.05 MPa. What caused this? At the scene, there were indeed many water droplets on the surface of the equipment, similar to condensation droplets, but they did not drip. The manufacturer says it’s due to thermal expansion and contraction – the water coming from the water supply pipes is at a lower temperature, and by noon the temperature of the water rises and the pressure increases. Is that possible? Is it possible for the equipment’s volume to be 31 cubic meters?
It does exist; it naturally expands when heated and contracts when cooled. . Especially in winter. . In cases of large temperature differences
Yes, as the temperature increases, the saturated vapor pressure of water rises as well
Reply to 2# deep*a: But given the current weather conditions in Nanjing, can there be a difference of 0.05 MPa due to thermal expansion and contraction for equipment of this volume?
From the morning, when the temperature is low, and if it becomes warmer at noon, thermal expansion and contraction might occur; as for how large the pressure difference will be, that’s hard to say. Also, your equipment has a relatively large capacity, so it depends on external factors
There is such a possibility. If it is fully charged, the temperature will increase slightly, and the pressure will rise significantly.
It’s normal; there is definitely a change in pressure difference from night to noon, and a change of half a kilogram is quite normal.
This phenomenon does exist. I won’t repeat what others have said; I’ll mention just one thing: check the site to see if sunlight is falling on the equipment, as this can also cause an increase in temperature and thus an increase in pressure. An expert mentioned this situation to me in a conversation.
This is quite normal; it’s due to thermal expansion and contraction. Liquids are already very compressible, so it’s normal for pressure to increase under certain conditions.