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1. High reliability requirements. Due to the large ammonia plant and urea plant of the five centrifugal compressor units are all stand-alone operation, any outage will cause the whole plant to stop production, it is necessary to ensure the normal supply of steam. Fault shutdown of the boiler feedwater pump, will cause the drum water, long time will damage the water and waste heat boiler. Therefore, high reliability is the main indicator of the pump.