【Q&A Question 036】May 26, 2016

The standby pump will shut off the pre-heating line, open the inlet valve to release air, and check all aspects of the pump. After starting the pump, monitor the current. Through coordination between the operators on site, the outlet valve of the standby pump will be opened while the outlet valve of the operating pump is closed. Once it is confirmed that the outlet valve of the operating pump is fully closed, wait for a few minutes. If the standby pump operates properly, then the operating pump should be stopped

Close the inlet and outlet valves, and vent the oil once its temperature has dropped

After stopping the pump, close the inlet and outlet manual valves to cut off cooling

1 Turn off the power supply. 2. Drain the liquid inside the pump, clean it, and regularly rotate the impeller 180º to prevent shaft deformation, until the pump body is completely cooled.

Close the inlet and outlet valves, cool naturally or by using circulating water in the pump casing jacket; drain through the inlet and outlet drains, and open the low-strainer plug in the pump casing if necessary

Close the inlet and outlet valves, cool naturally or by using circulating water in the pump casing jacket; drain through the inlet and outlet drains, and open the low-strainer plug in the pump casing if necessary

Steps for starting the hot oil pump and switching pumps: a) Check that all components of the pump and motor are present in good condition, with no damage； 　　b) Align the vehicle properly, add lubricant, turn on the cooling water – cooling water for the machine base ； 　　c) Lead the sealing oil to the pump inlet and remove water from it; preheat the pump in advance ； 　　d) Open the inlet valve fully, close the outlet valve, and open the exhaust valve to fill the pump chamber with liquid ； 　　e) Start the motor, and check its temperature, bearing temperature, vibration, as well as for any leaks ； 　　f) When the pump outlet pressure reaches the rated value, the outlet valve should be gradually opened until normal operation is achieved; once the hot oil pump is operating properly, seal oil should be supplied immediately ； 　　g) A thorough inspection and all preparatory work must be carried out before starting the standby pump; hot oil pumps should be fully preheated ； 　　h) Open the inlet valve of the pump and close the outlet valve completely, so that the pump chamber is filled with the medium; then use the exhaust valve to remove all the gas ； 　　i) Start the motor and check the operation of all components; once normal operation is achieved and the current remains stable, gradually open the outlet valve of the standby pump while gradually closing the outlet valve of the operating hot oil pump. Once the standby pump is operating properly, turn off the preheating line and inlet valve of the hot oil pump, and rotate the pump shaft once every half hour to prevent it from sticking ； Wait until the pump body temperature drops below 60 degrees Celsius, then discharge the liquid. After the pressure is released, open the nitrogen valve to purge until all air is removed.

This post was last edited by wangld on 2016-5-26 at 16:50. First, close the outlet valve and stop the hot oil pump; then close the inlet manual valve to cut off cooling. Once the temperature drops below 150°C, the sludge tank should be diverted to venting.

Close the inlet and outlet valves, turn off the preheating line, and empty it after cooling

Turn off the power. Drain the liquid from the heat transfer oil pump, clean it, and rotate the impeller 180 degrees at regular intervals to prevent shaft deformation, until the oil pump is completely cooled