Stop to purge gas lines, the following practice is wrong ( ).
Gas lines are purged using ( ) when the unit is stopped.
When the unit is stopped, the specified time for gas line purging is not less than ( ).
Stop to purge gas lines, the following is wrong ( ).
When the unit is stopped, ( ) the line should be swept with water headspace before steam purging.
Light oil (gasoline, kerosene) line purging, unit vapor pressure requirements ( ).
When the unit is stopped, the gasoline line should be used before sweeping the line ( ).
It is considered in ( ) to use water top before purging gasoline and kerosene lines.
When the pipeline of the following medium is out of service, ( ) the pipeline must be opened with hot steam.
The following heavy oil line purge practice is wrong ( ).
When sweeping the wire, the first of the following items to be swept is ( ).
When the following media pipelines are swept, the ( ) line is the most difficult to purge clean.
Before the heat exchanger is purged to steam, it should be ( ).
When the heat exchanger gives steam to purge steam, it should ( ).
When the heat exchanger needs to be repaired, the heat exchanger should be cut out first, and then the oil in the heat exchanger is drained, and finally ( ).
