Figure 3-33 Charging nitrogen to pipes with installing low-temperature
component
(1) Liquid pipe needle valve (2) Discharge pipe needle
valve
(3) Low-pressure needle valve
(4) Low pressure valve 1 (5) High pressure valve 1 (6) Low pressure valve 2
(7) High pressure valve 2 (8) Reducing valve (9) Nitrogen steel vessel
Step 2 Open the pressure gauge valves and reducing valve to charge nitrogen into the
pipes to preserve the pressure at 3.5 MPa for 24 hours. The system pressure should
not decrease before and after pressure preservation provided that the ambient
temperature is stable. If the pressure varies due to ambient temperature changes,
conduct the pressure preservation test again.
The outlet pressure must be no more than 3.5 MPa. If the outlet pressure is more
than 3.5 MPa, some parts of the system may be damaged.
Step 3 If the pressure decreases, nd out and repair the leakage point by using soap
bubbles or a halogen leak detector. If the pressure is preserved properly, exhaust
nitrogen from the three positions shown in Figure 3-23.
NetCol5000-A(025, 035) In-row Air Cooled Smart
Cooling Product
User Manual (600 mm Width) 3 Installation Guide
Issue 17 (2020-10-22) Copyright © Huawei Technologies Co., Ltd. 62
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