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Checking Air Tightness of Manifolds and the Secondary Loop
Perform a pressure-preservation test on the connected manifold and the secondary loop branch of the cabinet.
Before performing this operation, ensure that manifolds are connected to the secondary loop in the equipment room.
Procedure
- Remove the two water inlet pipes A and B that connect different nodes from the water inlet manifold. See Figure 8-67.
- Connect water inlet pipe A to a pressure gauge. During the connection, hold the outer ring of the water inlet pipe connector, move it backward, and push it forward.
- Connect water inlet pipe B to an air compressor. During the connection, hold the outer ring of the water inlet pipe connector, move it backward, and push it forward. Increase the pressure to 600–650 kPa.
- Disconnect the air compressor. After the pressure is stable for 10 minutes, record the pressure gauge reading.
- Preserve the pressure for 60 minutes, record the data again and calculate the pressure drop.
- Check whether the pressure drop is less than or equal to 15 kPa.
- If yes, this item is qualified.
- If no, this item is unqualified. Adjust the flange of the secondary loop branch, and then perform the pressure-preservation test again until the air tightness is qualified.
- Open the manifold exhaust valve to discharge air and release pressure.
- After the discharge is complete, close the manifold exhaust valve.
- Reinstall water inlet pipes A and B on the water inlet manifold. See Figure 8-68.
