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enter image description hereFirst time

I connect some pipes, then I fill water pressure into the pipeline to 10 kg cm$^{-2}$, but the pressure became 9 kg cm$^{-2}$ on the next day, I think about pressure drop cause fill air in pipes.

enter image description hereSecond time

I install the air relief valve at the high point, then I wait for $30$ minutes, water pressure became 9.8 kg cm$^{-2}$, I closed the air relief valve, doing this will ensure that the pressure will not drop again the next day?

If water pressure became 9 kg cm$^{-2}$ the next day, but the pipes didn't leak, how to explain this happening?

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  • $\begingroup$ Can you reword this: "...I think about pressure drop cause fill air in pipes..."? $\endgroup$
    – Brendan Darrer
    Mar 8 at 10:40

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Maybe the water pressure decreases when the water is cooled during the night.

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