Graphite gasket sealing
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The graphite gasket was tightened to 110 Nm, and a water pressure test was conducted; however, the lower part of the tank still leaked. Could someone expert please advise whether the issue lies with the torque, the graphite gasket, or the diameter of the partition holes.
Gaskets have a compression ratio, and they can generally only deform to a certain extent. Based on the gasket thickness you provided, the gasket is likely already worn out.
Gaskets with horizontal scratches are not recommended for use
Using the process of elimination, issues such as scratches on the gasket, incorrect tightening of bolts, or quality problems with the gasket itself could all be possible; only a specific analysis of the situation can determine the cause； By removing the gasket, it is possible to get a preliminary assessment of its quality; one should check the condition of the graphite winding layer to see if it appears like wet waste paper – such gaskets are seriously defective