After the machine pump is out of service, it should generally be turned off every half hour until the temperature of the pump body drops to ( ).
Centrifugal pumps with light oil delivery medium may not be operated ( ) before disassembly and inspection.
In order to improve the purging effect, the heavy oil pump should be purged before maintenance ( ).
What is wrong with the main points of the preparation work before the machine pump is shut down for demolition and repair ( ).
The role of the standby pump for periodic turning is ( ).
The role of the standby pump for periodic turning is ( ).
One of the following options that is not a backup pump for regular turning is ( ).
The role of the standby pump for periodic turning is ( ).
The role of the centrifugal pump mechanical seal filling oil is ( ).
Of the following options, the statement about the action of sealing oil is wrong ( ).
The effect of oil film formation on the end face of dynamic and static ring after the mechanical seal of centrifugal pump is ( ).
The role of the centrifugal pump mechanical seal filling oil is ( ).
Pump lubricating oil in operation, which can be judged to have deteriorated except ( ).
Of the following options, it is not possible to judge that the lubricating oil of the pump in operation has deteriorated is ( ).
In operation, the lubricating oil deterioration of the machine pump can be determined by ( ).
