Thanks for watching and glad we could help. If you want more refreshers, you should check out our Weekly Boiler Tips playlist. ua-cam.com/play/PLtXrfnqEhRXA6rwnsY8CGxsSx_qjOhGr0.html
How do you do a cold startup on the dearator? If you establish a proper water level first with the boiler off the water in the dearator it will be cold and you don't want cold water entering the boiler when the boiler starts up. How then is the water first preheated if the boiler itself is not running to provide steam to the dearator. It's like a catch 22.
You have no choice with a cold system and deaerator but to fill the boiler and start up with cold water. Because the boiler is cold, this does not create the same thermal shock as adding cold water to a hot boiler. The boiler should be warmed slowly to minimize warm up stress. Condensation may occur during startup due to the cold vessel temperature. This is sometimes mistaken for leaking on startup. As the boiler creates steam, makeup water to the DA will be heated. This can be optimized by opening the DA vent valve to speed air removal, temporarily bypassing the steam regulating valve feeding the DA to introduce steam earlier, and keeping the DA level a minimal until some steam pressure is established on the vessel. If the DA is at full operating temperature, rapidly filling a cold boiler with hot deaerator water can cause shock as well - tempered water is preferred.
Our facility is at about 4500 feet above sea level. We have a condensate return tank and a deaerator as well as an economizier. The condensate tank is not pressurizied and is 'normally' between 165 and 180 degrees. We believe there is some steam getting passed a steam trap and back to the plant. The deaerator is 'normally' 222-224 degrees and the pressure is around 6-8 psi. After the economizer, our feed water is about 240 degrees going into the boiler. With that as background, we have a very small plume of steam coming out of the pipe from the DA. Id say 6-12". I opened the vent valve and there was no appreciable difference in the plume, however there was an increase in H2O coming from the drain (connected to both condensate and DA, but assume the increase from the DA). Also, is 224 about the best we can get? Thank you in advance!
Should a DA making very loud banging noises when the return condensate is being pump into it? We run a low pressure plant 10psi, and have a vacuum return system. When our condensate pump runs and pumps into the DA it get very violent and loud banging. Also, now that is it has warmed up our condensate temps are about 40degrees lower, our DA temp has went from 220 to 214. With no changes by the operators, I thought it should maintain temp no matter what the incoming temp is?
Here are a few causes. First, if your pressure reducing station feeding the DA is malfunctioning, it can pass excess steam. Throttling a steam valve to the station will drop that pressure if this is the case - and the problem will need to be diagnosed and corrected. If throttling the steam supply to the DA does not relieve the pressure, you may have failed steam traps in the system. Steam passing through these failed open traps (or open bypasses) is exceeding the amount of steam the DA requires. Lastly, you may have a process that simply discharges very large amounts of flash steam. In some cases automated pressure control vent valves are required. Processes in these cases return condensate at a temperature and pressure that exceeds the preheat requirements of incoming makeup water. A specialized high pressure return system may be used in these applications - such as paper and cardboard manufacturing. High pressure on the DA can cause backup of condensate return systems, resulting in flooded heat exchangers on lower pressure applications. It can also cause damage to feed pump seals. In extreme cases, it can even prevent makeup water from entering the DA, resulting in low level, pump shutdown, and eventually boiler shutdown. Hopefully that helps!
If your talking about vessel pressure in the DA it should run around 4-8 psi. If your running more than that it’s either your steam or incoming water pressure. Do you have a vent open? And what pressure do you have from your steam ?
@@WildBill1984 I have some issues with my DA at the moment. I seen you tried to help that other guys question. Well I have a discharge pressure of 20 to 21 at times and I'm not getting the adequate amount of makeup water. Is it due to the pressure to high?
I have 2 DA tanks that we use only one at a time. What is the proper lay up procedure for the tank when not is use keeping in mind that I only have minutes to bring the other tank on line if something happens to the tank I'm using. I work for a hospital .Thank you in advance.,\\
Tricky question. This is a bit hard to answer because there are a lot of unknowns so we can at least list out the benefits / problems with each. A wet layup will have your tank filled ready to go but the water will be cold and could potentially introduce cold water into your hot boiler which is dangerous. It will take time to warm the filled tank. Dry Layup will be able to heat the water as it is filling but you would still need time to get the tank to operational levels. This would be a better choice depending on the size of your tank as it might not take long to fill. The best choice really is to have the tank on standby but active so it stays hot and ready to go but that also might not be the most economical choice. Hopefully that helps. If you wanted to talk in more detail, please do not hesitate to give us a call and someone can help you. (800) 228-8861
Hi I have an off topic question. I have 2 cooling towers running in parallel and they keep overflowing and I’m losing a lot of chemical. I’ve adjusted the floats as much as I can, but am still having overflow issues. Do you have any ideas of what could be happening? As far as I can tell all other components are functioning correctly. Thanks
Unfortunately this isn't something we could really comment on as there are a lot of variables in play. If you would like please contact us directly and we might be able to come up with something. 800.228.8861 Thanks for watching!
Hi just to comment Everytime my Cooling towers overflow the problem I have is Scale Clogging the Flow Tubes at the Top of the Tower .. Also Do you have the Finger Style level Control or the Bulb Style? If the Bulb style they usually get water inside and that will give you issues I hope this helps
Good information, for sure. Always nice to get a refresher.
Thanks for watching and glad we could help. If you want more refreshers, you should check out our Weekly Boiler Tips playlist. ua-cam.com/play/PLtXrfnqEhRXA6rwnsY8CGxsSx_qjOhGr0.html
Thanks for the video! Any advice on the vacuum breaker leaking steam? Pressure is 6psi.
Thank u guys as always . Great information.
Thanks for watching!
Thank you!
Well explained👍🏾
How do you do a cold startup on the dearator? If you establish a proper water level first with the boiler off the water in the dearator it will be cold and you don't want cold water entering the boiler when the boiler starts up. How then is the water first preheated if the boiler itself is not running to provide steam to the dearator. It's like a catch 22.
You have no choice with a cold system and deaerator but to fill the boiler and start up with cold water. Because the boiler is cold, this does not create the same thermal shock as adding cold water to a hot boiler.
The boiler should be warmed slowly to minimize warm up stress. Condensation may occur during startup due to the cold vessel temperature. This is sometimes mistaken for leaking on startup.
As the boiler creates steam, makeup water to the DA will be heated. This can be optimized by opening the DA vent valve to speed air removal, temporarily bypassing the steam regulating valve feeding the DA to introduce steam earlier, and keeping the DA level a minimal until some steam pressure is established on the vessel.
If the DA is at full operating temperature, rapidly filling a cold boiler with hot deaerator water can cause shock as well - tempered water is preferred.
Check out those Spence Type ED Valves!
Why is our dearator constantly squeaking/ squealing? Constantly running fluctuating 3 feed water pumps isn't normal either
Our facility is at about 4500 feet above sea level. We have a condensate return tank and a deaerator as well as an economizier. The condensate tank is not pressurizied and is 'normally' between 165 and 180 degrees. We believe there is some steam getting passed a steam trap and back to the plant. The deaerator is 'normally' 222-224 degrees and the pressure is around 6-8 psi. After the economizer, our feed water is about 240 degrees going into the boiler.
With that as background, we have a very small plume of steam coming out of the pipe from the DA. Id say 6-12". I opened the vent valve and there was no appreciable difference in the plume, however there was an increase in H2O coming from the drain (connected to both condensate and DA, but assume the increase from the DA). Also, is 224 about the best we can get?
Thank you in advance!
Thanks
Should a DA making very loud banging noises when the return condensate is being pump into it? We run a low pressure plant 10psi, and have a vacuum return system. When our condensate pump runs and pumps into the DA it get very violent and loud banging. Also, now that is it has warmed up our condensate temps are about 40degrees lower, our DA temp has went from 220 to 214. With no changes by the operators, I thought it should maintain temp no matter what the incoming temp is?
What about high steam pres and low water temp. I got 11psi steam 10 psi water and temp is about 198.
For clarification, there's no pop safety or relief vlv on a da correct?
Hey Jude, great video. Question, what causes high pressure on DA and what is the effect of this to the system? Thanks
Here are a few causes.
First, if your pressure reducing station feeding the DA is malfunctioning, it can pass excess steam. Throttling a steam valve to the station will drop that pressure if this is the case - and the problem will need to be diagnosed and corrected.
If throttling the steam supply to the DA does not relieve the pressure, you may have failed steam traps in the system. Steam passing through these failed open traps (or open bypasses) is exceeding the amount of steam the DA requires.
Lastly, you may have a process that simply discharges very large amounts of flash steam. In some cases automated pressure control vent valves are required. Processes in these cases return condensate at a temperature and pressure that exceeds the preheat requirements of incoming makeup water. A specialized high pressure return system may be used in these applications - such as paper and cardboard manufacturing.
High pressure on the DA can cause backup of condensate return systems, resulting in flooded heat exchangers on lower pressure applications. It can also cause damage to feed pump seals. In extreme cases, it can even prevent makeup water from entering the DA, resulting in low level, pump shutdown, and eventually boiler shutdown.
Hopefully that helps!
If your talking about vessel pressure in the DA it should run around 4-8 psi. If your running more than that it’s either your steam or incoming water pressure. Do you have a vent open? And what pressure do you have from your steam ?
What’s your temp?
@@WildBill1984 I have some issues with my DA at the moment. I seen you tried to help that other guys question. Well I have a discharge pressure of 20 to 21 at times and I'm not getting the adequate amount of makeup water. Is it due to the pressure to high?
I live in Karachi Pakistan I like your comments send 4 month ago
Thank You Again 🤙🏻 If you Ever make it to Hawaii Lunch is on Me I Hope you Like Poi 🤙🏻🌺🍻
Glad we could help! Hopefully one day we can take you up on it! Thanks for watching.
Hey there! When you guys say 5-7 psi you are referring to gauge pressure and not absolute pressure, correct?
I have 2 DA tanks that we use only one at a time. What is the proper lay up procedure for the tank when not is use keeping in mind that I only have minutes to bring the other tank on line if something happens to the tank I'm using. I work for a hospital .Thank you in advance.,\\
Tricky question. This is a bit hard to answer because there are a lot of unknowns so we can at least list out the benefits / problems with each. A wet layup will have your tank filled ready to go but the water will be cold and could potentially introduce cold water into your hot boiler which is dangerous. It will take time to warm the filled tank. Dry Layup will be able to heat the water as it is filling but you would still need time to get the tank to operational levels. This would be a better choice depending on the size of your tank as it might not take long to fill. The best choice really is to have the tank on standby but active so it stays hot and ready to go but that also might not be the most economical choice.
Hopefully that helps. If you wanted to talk in more detail, please do not hesitate to give us a call and someone can help you. (800) 228-8861
Hi I have an off topic question. I have 2 cooling towers running in parallel and they keep overflowing and I’m losing a lot of chemical. I’ve adjusted the floats as much as I can, but am still having overflow issues. Do you have any ideas of what could be happening? As far as I can tell all other components are functioning correctly. Thanks
Unfortunately this isn't something we could really comment on as there are a lot of variables in play. If you would like please contact us directly and we might be able to come up with something. 800.228.8861 Thanks for watching!
wareboilers thanks for the reply
Hi just to comment Everytime my Cooling towers overflow the problem I have is Scale Clogging the Flow Tubes at the Top of the Tower .. Also Do you have the Finger Style level Control or the Bulb Style? If the Bulb style they usually get water inside and that will give you issues I hope this helps
Can the DA vent valve be locked open during normal operation?
I live in Karachi Pakistan I like your comments send 4 month old
how to prosses dearator to boiler to drum to turbine wirh temretur & press
Not sure I understand the question. Mind explaining it a bit more? Thanks for watching though!
when deriator temp goes 105 degree C ...what should i do....
Mind explaining your question a little better? Not really sure what you are asking. Thanks for watching!