since 4th minute you explain pressure relation and its influence on surge. You said that to prevent surge the pressure P2 must be greater than P1, I think there is a typo, since P1 is inlet pressure and P2 is an outlet pressure, the greater outlet pressure causes surge, so it's oposite to what you said in this movie.
ok, so they did not explain it well. As Szabolcs says a compressors job is to increase the pressure. However, I understand your point that the whole backflow starts because P2>P1. Well what they don't explain well is that surge happens when P2>P1 yet P2 is not sufficiently large for the air to exit from the exit valve. In other words, you don't want P2 to just be greater than P1. You want it to be sufficiently large so it can get out. another way of reducing the possibility of surge is to loosen the exit valve so air gets out easier, though that way you may not get the required compression ratio. p.s. a drop in p1, like in the case Szabolcs says, can also lead to surge.
@@mohammadbeitsadi If you follow, the normal pump curve then at a higher P, there are more chances of a surge and hence at a higher pressure it'll have the so called energy to exit the exit valve (as per your previous comment); arnt the 2 statements contradicting. Dont mind, if i said something wrong. I'm confused with the very concept of Surge and hence the comment. Also, if you have a better explanation of Surge (either thru a book or video), then kindly share. Thanks !
@@vanshlakhina2162 the fact is that the curve in that video does not really represent the compressor's curve in reality we better say it's for the receiver or in-between be cause the high pressure is due to the accumulation of gas with no way out not due to the compressor's discharge and we all know that no way out it's like a closed valve = no flow and that is the surge point :)
The P2 will always be higher, but when the outlet is chocked or blocked then surge will occur. It can also happen when the inlet is chocked due to inlet valve closure or filter choke up. In this video, the reason for surge is not explained I guess.
Install a check valve in de compressor discharge nozzle. It will not prevent surge, but it prevents a violent back flow and therefore it protects the compressor against damage. Instead of a heavy low-frequency surge you will get a high-frequency mild surge.
+Jan Huisman I know with liquids the pressure waves can travel faster than the check valves will move, I'm assuming with gases this isn't as much of an issue?
Not entirely. A check valve does not prevent a surge, but limits the effects if one occurs. A blow-off valve spills the gas to the atmosphere and is used as an anti-surge valve. This can only be done with non-toxic and inexpensive gases. For air this works fine. For industrial compressors the anti-surge valve recirculates the required amount of gas to the compressor suction, so that surge is prevented, but no gas is lost. In this circuit we need a cooler to remove the heat of compression from the gas.
Hello, just say thanks for that amazing video, very educative and a really hard work, i think that is my problem in my nissan tiida(versa) 1.5 turbo diesel, because i´m listening a rare noise when i run, i´ll see the video again jejeje its nice. thanks dude.
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Such an interesting way of explanation. Thanks a lot!
Thank you for this great excellent work!
AMAZING AND SUPER CLEAR, THANKS
since 4th minute you explain pressure relation and its influence on surge. You said that to prevent surge the pressure P2 must be greater than P1, I think there is a typo, since P1 is inlet pressure and P2 is an outlet pressure, the greater outlet pressure causes surge, so it's oposite to what you said in this movie.
Hey Pavel, we want P2 to be bigger, that is the reason why we are using compressors. The problem is when there is no flow.
ok, so they did not explain it well. As Szabolcs says a compressors job is to increase the pressure. However, I understand your point that the whole backflow starts because P2>P1. Well what they don't explain well is that surge happens when P2>P1 yet P2 is not sufficiently large for the air to exit from the exit valve. In other words, you don't want P2 to just be greater than P1. You want it to be sufficiently large so it can get out. another way of reducing the possibility of surge is to loosen the exit valve so air gets out easier, though that way you may not get the required compression ratio. p.s. a drop in p1, like in the case Szabolcs says, can also lead to surge.
@@mohammadbeitsadi If you follow, the normal pump curve then at a higher P, there are more chances of a surge and hence at a higher pressure it'll have the so called energy to exit the exit valve (as per your previous comment); arnt the 2 statements contradicting.
Dont mind, if i said something wrong. I'm confused with the very concept of Surge and hence the comment. Also, if you have a better explanation of Surge (either thru a book or video), then kindly share. Thanks !
@@vanshlakhina2162 the fact is that the curve in that video does not really represent the compressor's curve in reality we better say it's for the receiver or in-between be cause the high pressure is due to the accumulation of gas with no way out not due to the compressor's discharge and we all know that no way out it's like a closed valve = no flow and that is the surge point
:)
The P2 will always be higher, but when the outlet is chocked or blocked then surge will occur. It can also happen when the inlet is chocked due to inlet valve closure or filter choke up. In this video, the reason for surge is not explained I guess.
Install a check valve in de compressor discharge nozzle. It will not prevent surge, but it prevents a violent back flow and therefore it protects the compressor against damage. Instead of a heavy low-frequency surge you will get a high-frequency mild surge.
+Jan Huisman I know with liquids the pressure waves can travel faster than the check valves will move, I'm assuming with gases this isn't as much of an issue?
+luthmhor I have no experience with liquids, that's something for pumps, I would say. For compressors the anti-surge check valve is a standard issue.
This check valve is similar to a 'blow off valve' in a turbocharged vehicle yes? Is it recommended to recirculate the surging/compressed charge?
Not entirely. A check valve does not prevent a surge, but limits the effects if one occurs. A blow-off valve spills the gas to the atmosphere and is used as an anti-surge valve. This can only be done with non-toxic and inexpensive gases. For air this works fine. For industrial compressors the anti-surge valve recirculates the required amount of gas to the compressor suction, so that surge is prevented, but no gas is lost. In this circuit we need a cooler to remove the heat of compression from the gas.
Good job ! Thanks for your hard work, it was very useful and understandable !
what will happen if compressor starts to work at surge point?(i mean the the first time compressor work)
Great video! Can you also make a video on choking in compressors?
Hello, just say thanks for that amazing video, very educative and a really hard work, i think that is my problem in my nissan tiida(versa) 1.5 turbo diesel, because i´m listening a rare noise when i run, i´ll see the video again jejeje its nice. thanks dude.
❤🎉 EXCELLENT EXPLANATION
Relly very useful and perfectly super easily explained!!)
Nice explanation
In symptoms u r telling discharge pr as high and before that surge occur when P2 is low,P2 is discharge pr
great job! clear and easy to understand!
Nice video for learning
"The people who are reading this may God give them wealth and prosperity ❤️
Wish me a very happy birthday
really great!
thanks
Could you please explain what “Head” means?
It means pressure (discharge in this case)
Thanks a lot, Ajmal!
thanks a lot that was very useful
No, dude no way....not with a refrigerant charge....lol....sweet video though....
good job
Bearing thrusts over hear....
This Explanation of sure is INCORRECT as this phenomenon is a compressor INTERNAL phenomenon
tHANKS aJMAL