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screen printing => Equipment => Topic started by: 3Deep on August 06, 2015, 12:37:47 PM
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I know this is going to sound stupid, but yesterday I was in a hurry and went to chiller and just crank the air valve wide open letting a big rush of air into the press and heard nasty bang sound, my normal way is to open it up slowly until the press air tank is full them open it up all the way. Question do any of think just cranking it wide open and letting air rush in will harm anything, I'm kinda thinking doing that might blow open a seal or something, I know if I had a worker that did that to my press I would be pissed (wide open air start up).
darryl
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Not sure what the pros will say, but I just always have eased it on. Just seems like the right thing to do?
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you turn your air off every night? We leave everything powered up... the chiller makes the compressor cycle about once or 2x an hour, but makes it easier, and keeps the screens locked in place as well if we leave a plastisol job setup over night.
you may have been hearing the tubes move around or bounce as things moved.
-J
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i don't leave the compressor on overnight...i had a bad experience. we blew a hose that caused it to run all night and the pump seized. I really don't recommend leaving things on overnight that can do that..like water to a hose, etc. you're asking for trouble in my opinion...
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I turn everything off and drain the compressor and water traps every night. Come in and start over in the am.
Yes you can blow a line, valve, etc shocking the system.
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I turn everything off and drain the compressor and water traps every night. Come in and start over in the am.
Yes you can blow a line, valve, etc shocking the system.
same here, we run tandem chillers/compressors....I don't like the idea of leaving it on all night, that scares me a bit. And we always ease the air on with the ball valves, never crank them open fast. It doesn't take long to charge the line so why crank it open fast?...
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i don't leave the compressor on overnight...i had a bad experience. we blew a hose that caused it to run all night and the pump seized. I really don't recommend leaving things on overnight that can do that..like water to a hose, etc. you're asking for trouble in my opinion...
We have had a fitting fail during the day and because of that turn the compressor off before we leave. It would be no good to have a fitting or hose fail overnight. This requires tightening the manual clamps for jobs staying on press overnight but that is merely a couple minutes.
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Thanks guys, and yeah we never leave any air to our press overnight plus the Anatol press we have has air and manual clamps so the screen stay nice and tight. I couldn't see us walking out and leaving anything on I even turn the breaker off on the compressor just in case a line blows.
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I've been told by the pneumatic guys that turning off the air increases the potential for getting moisture in the system, and the 'mass' flow of air through the chiller can result in water in the lines.. you can actually see this happen if you if you have a moisture trap before the chiller... you'll get a dump of water right after you open the valve.
but I suppose you guys are right about fittings failing at night... wonder what the 'real' solution is that.
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you turn your air off every night? We leave everything powered up... the chiller makes the compressor cycle about once or 2x an hour, but makes it easier, and keeps the screens locked in place as well if we leave a plastisol job setup over night.
you may have been hearing the tubes move around or bounce as things moved.
-J
Our M&R tech told us not to leave the press pressurized over night. And upon start up in the morning to slowly let if fill up with air.
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I've had full air on up to the press pretty much every time I've turned on the old GT-8 or the newer RS, never had issues.
Perhaps 244 cares to chime in on this as far as his presses go?
Agree 100% not to leave compressor on overnight. Had a neighbor with a blown hose, we saved his comp--called and asked "Is your recip supposed to be running right now?" They were out on a job--hadn't even been in that day yet.
IMO you shouldn't have any problem keeping the air locks on all night with a decent size tank--fix your air leaks, lazy guy. ;)
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I've had full air on up to the press pretty much every time I've turned on the old GT-8 or the newer RS, never had issues.
Perhaps 244 cares to chime in on this as far as his presses go?
Agree 100% not to leave compressor on overnight. Had a neighbor with a blown hose, we saved his comp--called and asked "Is your recip supposed to be running right now?" They were out on a job--hadn't even been in that day yet.
IMO you shouldn't have any problem keeping the air locks on all night with a decent size tank--fix your air leaks, lazy guy. ;)
Air should be left on all the time. When you turn the compressor off at night or weekends the air that is in the lines will re-absorb the moisture in the lines or ambient air. Air that is chilled and under pressure wont do that. Every time you turn the compressor on you are running it to refill the system adding wear and tear to it as well as the chiller. To prevent damage from a possible hose bursting and flying all over the place beating up whatever is around it add another ball valve just like the one you use to turn the air off. Before you add it close the ball valve and drill a 1/8" hole through the ball. Now when you go home just close the valve and the hole will keep the system full. This will also let the compressor cycle instead of running constantly and burning itself up. Doing this will not let hoses become unseated and prevents the pressure strains from affecting the air components. We have been doing this for 30 years without issue.
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@Rich reading your post sound like your saying refilling the compressor tank correct, I never let my compressor tank run empty it stays full, I just turn the power off and shut the air valve off at the chiller. Now far as the press goes it leaks down which tells me it has some air leaks, but I thought that the press leaking down was normal. If I read your post correct I still don't think I want to have air pressure on my press full time when not in use or left over the weekend, but that's just me, good to learn something new anyway.
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I just spent about 20 minutes on the phone with a regional manager for Kaeser. I just asked him to educate me on this. I won't go into what he told me, as it would likely be different from what your rep or sales person might say, depending on brand. So now I am 100% satisfied with how I run my compressors. Make a phone call or send an email. Get it straight from the horse's mouth. I've been doing it right, and now I know for sure.
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@Rich reading your post sound like your saying refilling the compressor tank correct, I never let my compressor tank run empty it stays full, I just turn the power off and shut the air valve off at the chiller. Now far as the press goes it leaks down which tells me it has some air leaks, but I thought that the press leaking down was normal. If I read your post correct I still don't think I want to have air pressure on my press full time when not in use or left over the weekend, but that's just me, good to learn something new anyway.
I personally think its better to keep the press pressurized all the time, at least for ours it is.
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also, a rotary screw is meant to run 100% duty cycle, so even if it did start running constantly overnight, nothing bad should happen.
I do like rich's idea of a hole in the ball valve, but what I may do is a 1/8" hose "bypass" around the ball valve with a second gate valve for maintenance when needed.
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also, a rotary screw is meant to run 100% duty cycle, so even if it did start running constantly overnight, nothing bad should happen.
I do like rich's idea of a hole in the ball valve, but what I may do is a 1/8" hose "bypass" around the ball valve with a second gate valve for maintenance when needed.
Just buy a ball valve with a brass ball and you can drill it in less than a minute.
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I like to follow manufacturer's recommendations :-X
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our atlas copco compressor has two PSI setpoints and is programmable for day/week/month selections of setpoints. 15 minutes before the shift comes in the compressor is set to 110 psi, and 15 minutes after the shift leaves it will maintain 60 psi. we were shutting it off at night and turning off the air before the chiller but this is easier.
oh
after working on a press (maintenance) with the air off, i always slowly open the air valve - ive had pneumatic oilers pop off because ive failed to seat the o ring correctly after filling it with oil.
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also, a rotary screw is meant to run 100% duty cycle, so even if it did start running constantly overnight, nothing bad should happen.
I do like rich's idea of a hole in the ball valve, but what I may do is a 1/8" hose "bypass" around the ball valve with a second gate valve for maintenance when needed.
Just buy a ball valve with a brass ball and you can drill it in less than a minute.
Thanks. I was just staring at a chromed ball valve thinking "There is no way in hell I am drilling this with my crappy tools"... :)
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also, a rotary screw is meant to run 100% duty cycle, so even if it did start running constantly overnight, nothing bad should happen.
I do like rich's idea of a hole in the ball valve, but what I may do is a 1/8" hose "bypass" around the ball valve with a second gate valve for maintenance when needed.
Just buy a ball valve with a brass ball and you can drill it in less than a minute.
Thanks. I was just staring at a chromed ball valve thinking "There is no way in hell I am drilling this with my crappy tools"... :)
make sure the ball is bronze and not Stainless and it will be easy.
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Compressor on here all the time, Where are you losing air ? if my tank is full at the end of the day it usually doesn't even cycle on overnight.
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Somehow I think we might be moving from the question I asked, but still tons of good info to know, our compressor stays full of air all the time I just turn power it down when we leave and turn it back on when we are back in the shop. What I don't do is leave the air on to our press full time, which from what Rich sez is perfectly fine with there press's, so I thinking that is another great quality to owning an M&R press or speaks highly of there equipment. I don't know what other press manufacturer's recommend for there press as they are not on here to say, but our press is an all air press which I don't know if that makes a difference or not hmmm.
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I left the air on to our Javelin the entire time we owned it as well.
my thinking, is that the air lines, valves, etc all will endure LESS stress if you just leave the air on all the time vs inflating/deflating them every day.
things usually break when they're stressed and un-stressed repeatedly.
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We run two in tandem, with a device that alternates them. At the end of the day, we close the at the press, then both compressors are shut down, and the valves on each are closed. I think you probably made something slam into something else, as you usually let the air in slowly, it wouldn't happen. If it still works, you're probably OK...
Steve