How to shut down a two-stage symmetric piston compressor with no load?
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The outlet of the secondary compression stage is connected to the inlet of the primary compression stage via pipes, and there are also drain and vent valves at the inlets and outlets of the primary and secondary cylinders. Could you please advise on how to shut down the system with no load?
If there’s a 2-to-1 ratio, it opens when the 2-to-1 condition is met, or it opens under unloading pressure
Do you mean that opening it twice in a row could cause an alarm for high intake pressure? Regarding this no-load shutdown, does it mean that the pressure at level 1 and level 2 must be completely released before shutting down? Also, we don’t have a unloading valve.
Starting with two and returning to one raises concerns about excessively high pressure at the primary inlet, as the equipment does not have a unloader. If a shutdown without load is required, then the inlet and outlet vent valves have to be opened!
In positive-displacement compressors, as long as it does not stop under pressure, or the pressure is at its minimum, it can be in a no-load state. Absolute no load is impossible.
An inlet valve is gradually closed to reduce the amount of air intake; it must not be closed completely, otherwise an accident will occur. At the same time, open the outlet circuit valve; as long as the circuit valve is not opened too quickly, there should be no problem with the inlet pressure. Stopping the machine after depressurization can reduce damage to the moving parts. Of course, as mentioned above, there is no absolute no-load condition; it’s relative.