A few questions about compressors?
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1. Why must the balance line of the compressor be connected to a vent? 2. I noticed today that one of the pipes coming from the high-pressure side was returning to the inlet; (our requirement is that the inlet temperature must not be lower than -20 degrees, and I suspect this is the reason.) Does the compressor have a minimum reflux pipe? (With anti-surge line) 3. Who has information on interlocks? Please provide some to me! Thank you. This post was last edited by fdsunset on 2009-4-2 01:36.]
That shouldn’t be a balance tube, right! I think it might be something like air leakage! One of the methods used to prevent surge is by adjusting the compressor outlet; this involves creating a backflow in the buffer tank at the inlet of the outlet pipe. The principle behind this is to alter the performance curve of the compressor. There’s plenty of information available on forums, so I suggest you search for it
It can’t be left open, right? Is there a valve to control it?
The original poster had better upload pictures of your machines. As for the interlocks of the compressors, each compressor has its own specific interlock setup; it’s best to obtain the relevant data and drawings for that compressor from your own company. If there are still any doubts, feel free to send the drawings for everyone to discuss. The balance pipe is not connected to the vent; I assume you are referring to the flare pipe provided for ensuring a dry seal, whose gas pressure is higher than that of the gas in the balance pipe. The pipeline you mentioned, which goes from the high-pressure side back to the inlet, is the balance pipe. There are generally two types of anti-surge pipelines. For flammable, explosive, or toxic gases, as well as to reduce emission waste, a backflow mechanism from the compressor outlet is usually employed. This approach not only reduces the pressure at the compressor outlet and lowers the compression ratio but also increases the inlet flow rate, allowing the compressor to operate at a lower compression ratio and higher flow rate. With a stable inlet pressure, the angle at which gas is drawn in at the impeller inlet is not too large, preventing rotational separation and thus avoiding surge. For devices like air compressors, where the compression medium is a harmless gas and the cost is low, anti-surge measures generally involve simply venting the air. This is because the inlet pressure and flow rate of the air compressor are always guaranteed; since the pipeline is open, the surrounding area is filled with air! Last edited by 2ndliver on 2009-4-2 03:24]
1 That should be the exhaust pipe for shaft seal gas leakage, connecting the exhaust ports of both shaft seals as well as the vent line. This high-pressure gas pipeline is designed to regulate the temperature of the incoming gas; when the temperature of the incoming gas is low, a portion of the high-pressure, high-temperature gas is recycled to adjust the inlet gas temperature. For the 3-way interlock, it depends on your own unit settings; the interlock settings vary for different units ；
1. That shouldn’t be a balance line. It must be the return pipeline. There is venting. Prevents surge in the low-pressure cylinder. 2. That’s also called backflow. It also prevents wheezing. We have ones too. It’s a bit open usually. It is recommended that the poster check the opening degree on the main control unit. 3. I have the chain information. But the OP probably won’t need it.
Look at the original poster’s reply – it’s a bit embarrassing. How could they say such incompetent things?
I suggest that if you have an image of question 2, it would be best to share it; it will be clearer when looking at the image. Leaving it empty is probably to avoid too much pressure – is there a pressure regulator before it’s left empty?