Latest posts
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Reading the pressure–volume plot during the climb
The pressure-volume plot compiled live during pressurisation shows three signatures: healthy elastic pipe, trapped air, and the onset of yielding.
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Additive static heads, or why a line that fills can still fail to test
Air trapped at high points breaks the siphon and makes uphill heads add instead of balance. Why drive pressure can then exceed the safe working pressure of the line.
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Pressure–temperature analysis, and why half a degree decides the test
In a sealed water-filled line, pressure moves with temperature whether or not anything leaks. The relation, the constants, and why a half degree matters.