Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document.
Note: Even the most advanced machine translation cannot match the quality of professional translators.
Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Checking Air Tightness
(Optional) Checking Air Tightness of Compute Nodes
Before installing compute nodes into a cabinet, check the air tightness of all water inlet and outlet pipes of the compute node mainboards and NPUs to ensure no water leakage in the compute nodes.
If compute nodes and manifolds are checked together during the cabinet air tightness check, you do not need to check the air tightness of compute nodes separately. If the air tightness of the cabinet is unqualified, you can use this method to filter out the faulty compute nodes with leakage.
- The air supply (such as an air compressor) coupling and pressure gauge coupling that connect to the quick connect couplings of water inlet and outlet pipes of compute nodes must be made of aluminum alloy.
- Check that the quick connect coupling is free from foreign matters before installing it.
- After removing a quick connect coupling, take protective measures immediately to prevent foreign matter from entering the quick connect coupling.
Procedure
- Remove the plastic bags from water inlet and outlet pipes of a compute node.
- Remove the dust caps from the water inlet and outlet pipes of the compute node. When doing this, hold the outer ring of the pipe connector and move it backward. Then pull the dust caps. See (1) and (2) in Figure 8-57.
Keep the removed dust caps clean to prevent the tap water filter from being blocked by particles such as dust after the dust caps are reinstalled.
- Connect one end of the pipes to a pressure gauge. (The water outlet pipe is used as an example.) Hold the outer ring of the pipe connector, move it backward, and insert the pressure gauge connector. See (1) and (2) in Figure 8-58.
- Connect an air supply (such as an air compressor) to the water inlet pipe of the compute node. During the connection, hold the outer ring of the water inlet pipe connector, move it backward, and insert the air supply connector. See (1) and (2) in Figure 8-59. Increase the pressure to 600–650 kPa.
- Disconnect the air supply (such as the air compressor) and install dust caps for the water inlet pipe of the compute node. During the installation, hold the outer ring of the water inlet pipe connector and move it backward, and then insert the dust cap. See (1) and (2) in Figure 8-60. After the pressure is stable for 10 minutes, record the pressure gauge reading as P1.
- Keep the pressure for 10 minutes, record the pressure gauge reading as P2, and calculate the pressure drop (P1 – P2).
- Check whether the pressure drop is less than or equal to 7.5 kPa.
- If yes, go to 8.
- If no, contact Huawei technical support.
- Disconnect the pressure gauge.
- Connect one end of the blue pressure hose in the commissioning package to the water inlet or outlet pipe of the compute node. When you cannot hear any air exhaust sound, remove the hose.
- Install dust caps for water inlet and outlet pipes of the compute node. During the installation, hold the outer ring of the water outlet pipe connector and move it backward, and then insert the dust cap. See (1) and (2) in Figure 8-60.
- Check the air tightness of other water inlet and outlet pipes in the same way.
Checking Air Tightness of a Liquid-Cooled Cabinet
This section describes how to check the air tightness before connecting a cabinet to the secondary loop.
- At least two persons are required to perform this operation. One connects the pressure gauge while the other pressurizes manifolds using an air supply (such as an air compressor).
- Check that the quick connect coupling is free from foreign matters before installing it.
- After removing a quick connect coupling, take protective measures immediately to prevent foreign matter from entering the quick connect coupling.
- Before checking the air tightness of the liquid-cooled cabinet, connect the liquid-cooled pipes of all nodes to the manifolds.
Procedure
- Remove the dust caps from the two quick connect couplings (named A and B in this example) of the manifold. See Figure 8-61.
Keep the removed dust caps clean to prevent the tap water filter from being blocked by particles such as dust after the dust caps are installed.
- Connect the manifold quick connect coupling A to the pressure gauge using a transfer pipe. During the connection, hold the outer ring of the transfer pipe connector, move it backward, and push it forward. See (1) and (2) in Figure 8-62.
- Connect the manifold quick connect coupling B to an air compressor using a transfer pipe. During the connection, hold the outer ring of the transfer pipe connector, move it backward, and push it forward. See (1) and (2) in Figure 8-63. Increase the pressure to 600–650 kPa.
- Disconnect the air supply (such as the air compressor). After the pressure is stable for 10 minutes, record the pressure gauge reading as p1.
- Keep the pressure for 60 minutes, record the pressure gauge reading as P2, and calculate the pressure drop (P1 – P2).
- Check whether the pressure drop is less than or equal to 15 kPa.
- If yes, go to 7.
- If no, contact Huawei technical support.
- Disconnect the pressure gauge.
- Open the exhaust valve of the manifold to release the air until no obvious sound is heard. After the discharge is complete, close the manifold exhaust valve.
Because the operation space is limited, do not let the cap of the air exhaust valve fall off during the pressure release.
