Record of Fault Handling for Pump B of the Quench Water Pump in Phase 3 of Zhongneng Chemical Industry

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Record of Fault Handling for Pump B of the Quench Water Pump in Phase 3 Gasification of Zhongneng Chemical Industry. Author/Source: Zhongneng Chemical Industry. Date: 2022-02-19. Clicks: 16. During the night shift the day before yesterday, the shift leader at the Phase 3 gasification site conducted a routine inspection of the gasification facility as usual. At 17:05, on the first floor of the gasification slag water system, while checking the operating status of the quench water pump, he noticed that the seal ring at the motor’s inlet end of P1703B was moving outward, which meant there was a risk of leakage from the mechanical seal at any time. This could affect the proper supply of quench water to the gasification furnace, posing a significant safety risk. He contacted the control personnel to strengthen the monitoring of process parameters, promptly requested that a pump be switched over in the workshop, and reached out to maintenance workers and electricians to jointly assess the situation and resolve the issue. Shortly after 17:31, when the shift supervisor activated the ESD interlock to force an increase in the cooling water flow using the instruments, dripping leakage began to occur at the mechanical seal of P1703B. At 17:52, the on-site personnel rotated pump P1703C and conducted a thorough inspection, after which they contacted the control room staff to start pump P1703C. They also gradually opened the outlet and asked the control room staff to report the flow rate and current continuously. When the flow rate of the quench water was normal after opening the outlet of P1703C, everyone breathed a sigh of relief. Meanwhile, the personnel on site coordinated with those in the control room to close the outlet of P1703B. When only half a turn remained in the outlet of P1703B, it was found that the flow rate was normal, so P1703B was promptly shut down, the inlet and outlet of the pump were closed, and the power supply was turned off as per regulations. Immediately afterwards, with the assistance of the on-site operators, the electrician resolved the issue with the seal ring at the shaft end of motor P1703B successfully.