The issue of nitrogen purging before starting the fourth-stage new hydrogen compressor
Thread Content
During nitrogen purging, low-pressure nitrogen is definitely introduced in front of the primary inlet and then discharged at the fourth outlet. But I have a question: is the turbine rotated during this purging process? Is the unloader set to zero? Is the inter-stage return line open?
No need! The unloader is in the zero position; the return line is not open
Would it be more effective to switch the inter-secondary return line several times during the replacement?
You can’t open it at the last stage, right? Otherwise, if the valve leaks, there will be pressure leakage!
I don’t think it’s a problem; if the outlet check valve leaks, pressure can still flow to the previous stage, after all the load is zero.
It can also be opened! We have never activated the return valve in our daily operations!
Thank you! Got it! What is the sequence for shutting down? Is it correct to first open the return valves step by step from back to front to release pressure, then reduce the load to zero, and finally shut down the machine?
First, unload the pressure, then adjust the return line; when the pressure is reduced to 0, close the four check valves to prevent backpressure, and promptly close the inlet and outlet manual valves!
It is best to start the turntable during replacement, so that there are no dead corners in the replacement process； The circuit should also be fully open; when the unloader stops, its state is zero load, so there’s no need to consider that
I’m just starting to learn about hydrogen compressors and chlorine compressors; thank you