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Checking the Nitrogen Pressure
Context
Before delivery, low temperature components are injected with nitrogen to 0.2–0.6 MPa. Before connecting pipes, the nitrogen inside pipes must be discharged.
Nitrogen must be discharged; otherwise, air jets emitted during pipe welding may cause bodily injuries.
Procedure
- Connect the rubber hose to the pressure gauge, and tighten all pressure gauge valves.
- Remove the bonnets of the three needle valves on the low temperature component, and connect the other end of the hose to the three needle valves in turn, as shown in Figure 4-54.Figure 4-54 Checking the pressure of the low temperature component
(1) Needle valve 1
(2) Needle valve 2
(3) Needle valve 3
- If the pressure gauge reading is no less than 0.2 MPa, the unit is airtight. Then open the pressure gauge valve where the hose is connected to discharge nitrogen. After the discharge is complete, remove the hose and reinstall the valve bonnet.
- If the pressure gauge reading is less than 0.2 MPa, pipes have leakage points, and you need to contact Huawei technical support.
