Starting problems with reciprocating compressors
Thread Content
Question: Our plant’s process engineers require that when the compressor is started, the outlet valve or outlet vent valve not be opened; only the Stage 1 and Stage 4 valves are to be opened. As a result, the pressure at the fourth stage outlet reaches 10 KG right after the compressor starts up, which causes frequent leakage in the piston rod packing. May I ask, is it okay to operate the compressor in this way? Our operating procedure was also written by this process specialist. Employees have no choice but to follow the operating procedures.
This type of operation should not be the cause of frequent leakage in the piston rod packing, right? When the process medium is discharged directly or when the outlet valve is opened, the compressor consumes a lot of power, and the medium in the system will also flow back.
Before starting the reciprocating machine, the outlet valve must be closed; however, the vent valve can be left slightly open. But even if it’s not opened, there should still be no leakage at the packing – in that case, it’s necessary to check the installation or ensure proper lubrication. This won’t affect the pressure at the four outlets. After startup, the pressure reaches 10 kilograms – it’s possible that there is an issue with the design of your circuit
Now that both the inlet and outlet are open, can pressure still be retained at the final stage? It’s possible that the flow rate was designed to be low for each cycle; it is recommended to increase the diameter of the inlet. Also, the outlet valve is definitely closed. Start without load.