Cryogenic liquid pump failure reasons to exclude 1, the pump starts, the outlet pressure rise ⑴ impeller rotation direction does not match. ⑵ pump not fully to the cold, the pump gas. Exclude: ⑴ motor input line two-phase wiring to adjust ⑵ continue to cool, and open the anti-gas valve or adjust the seal gas pressure. 2, pump head or insufficient flow. ⑴ lack of motor speed. ⑵ impeller or pipeline blockage. ⑶ as the sealing pressure is too large, there is excessive gas into the pump. Exclude: ⑴ increase speed. ⑵ cleaning. ⑶ adjust the seal gas pressure. 3, the liquid can not be absorbed, indicating strong pressure beat ⑴ pipe valve is not open or pipe resistance. ⑵ pipeline leakage. Exclude: ⑴ open or clean. ⑵ repair 4, the motor temperature rise. ⑴ motor problems. ⑵ impeller mouth ring has been rubbed. ⑶ labyrinth seal has rubbed. Exclude: ⑴ electrician repair. ⑵ adjust the gap. ⑶ adjust the gap. 5, a sudden stop ⑴ seal gas pressure low chain. ⑵ stuck within the bearing. Exclude: ⑴ adjust the pressure. ⑵ cleaning or replacement. 6, vibration or noise occurs ⑴ fuselage and rotor do not have the same heart. ⑵ pump inlet pressure is too low or other causes of cavitation. ⑶ moving parts and fasteners friction ⑷ rotor parts loose. Exclude: ⑴ adjust ⑵ adjust the pressure, deflated. ⑶ calibration ⑷ maintenance
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