How come insulation application prevent freezing!? JT effect lowers temperature near zero degree. Insulation prevents from gas to exchange or absorb heat from surroundings. So doesn't it have a reverse effect!? Kindly explain how insulation jacket around throttling valve prevent icing .
Thank you for the question. The purpose of the insulating jacket is to keep cold, ambient temperatures and wind off of the valve. There are applications (line heaters) where the flow stream is heated prior to the pressure drop and the insulation also helps keep the heat inside the valve and piping. If you are operating in a warm climate, insulation specifically for the JT effect may not be needed because you want the warm air temperatures to exchange heat with the valve and piping as you have pointed out.
Thanks for the video. Is the upstream temperature going to change (decrease) if the pressure drop across the choke, hence the temperature drop downstream of the choke, is large? or the temperature upstream of the choke should not be affected, not matter how large the pressure drop is?
Kind of. It doesn't turn into liquid, but a supercritical fluid. On an input side. Critical temperature of the nitrogen gas -147 deg C. As you operate way above this temperature, and compression of gas will increase this temperature even more, you can't liquefy the nitrogen no matter the pressure. What can happen instead is the nitrogen can turn into supercritical fluid. The expansion via Joule-Thomson effect will reduce the temperature, but only if the pressure is less than 9 times the critical pressure. If the pressure is higher than that, the gas will actually heat up. So, to put a nitrogen gas and turn it into liquid, one can use Joule-Thomson expansion, but first it needs to be at proper temperature range, and at sufficiently low pressure, then cooled and liquefied using Joule-Thomson effect. The high pressure enough is not enough.
How come insulation application prevent freezing!? JT effect lowers temperature near zero degree. Insulation prevents from gas to exchange or absorb heat from surroundings. So doesn't it have a reverse effect!? Kindly explain how insulation jacket around throttling valve prevent icing .
This process is useless for hydrogen, helium and neon at room temperature because there are (way) above their inversion temperature. For these gases you actually heat them up.
Hello, I learned a lot from your videos. Thank you for sharing! I have a question to ask, can this valve withstand high temperature and high pressure? If so, is there any relevant research support? Look forward to your reply, thank you very much !
The temperature and pressure ratings vary by valve-type, and by which rubber-goods are used. The valve used in the video is one of our 2" High pressure control valves with NPT connections, giving it a Maximum pressure rating of 2000 PSIG. With our standard rubber goods, this valve can be used in service with temperatures ranging between -20*F to 225*F. For more information on how options affect temperature and pressure ratings, you can take a look on the site or in our online catalog.
No, our headquarters are in Oklahoma City, Oklahoma. We do have a global market however and do business and training with many countries, including India.
@@KimrayInc How come insulation application prevent freezing!? JT effect lowers temperature near zero degree. Insulation prevents from gas to exchange or absorb heat from surroundings. So doesn't it have a reverse effect!? Kindly explain how insulation jacket around throttling valve prevent icing .
Love youtube. Much easier to see 1 min video about it than listening to my heat transfer professor try to explain it for an hour...
Cool video been using these heaters for years in the gulf of mexico
I learnt about this when I was operating on an Ethylene plant in the 1960s.
Thanks nice video
It'd be great if everyone could just stop using the imperial system :)
How come insulation application prevent freezing!? JT effect lowers temperature near zero degree. Insulation prevents from gas to exchange or absorb heat from surroundings. So doesn't it have a reverse effect!? Kindly explain how insulation jacket around throttling valve prevent icing .
Thank you for the question. The purpose of the insulating jacket is to keep cold, ambient temperatures and wind off of the valve. There are applications (line heaters) where the flow stream is heated prior to the pressure drop and the insulation also helps keep the heat inside the valve and piping. If you are operating in a warm climate, insulation specifically for the JT effect may not be needed because you want the warm air temperatures to exchange heat with the valve and piping as you have pointed out.
Thanks a lot
So if i pressurise air to 114.7 psi in pump its temperature will increase 4 degree celcius...
Thanks for the video. Is the upstream temperature going to change (decrease) if the pressure drop across the choke, hence the temperature drop downstream of the choke, is large? or the temperature upstream of the choke should not be affected, not matter how large the pressure drop is?
The temperature of the upstream side will not be affected by the JT effect, only the downstream.
@@KimrayInc Thanks very much for the reply, much appreciated,
Under high enough pressure say with nitrogen gas a valve could turn it into a fluid.
Kind of. It doesn't turn into liquid, but a supercritical fluid. On an input side. Critical temperature of the nitrogen gas -147 deg C. As you operate way above this temperature, and compression of gas will increase this temperature even more, you can't liquefy the nitrogen no matter the pressure. What can happen instead is the nitrogen can turn into supercritical fluid.
The expansion via Joule-Thomson effect will reduce the temperature, but only if the pressure is less than 9 times the critical pressure. If the pressure is higher than that, the gas will actually heat up. So, to put a nitrogen gas and turn it into liquid, one can use Joule-Thomson expansion, but first it needs to be at proper temperature range, and at sufficiently low pressure, then cooled and liquefied using Joule-Thomson effect.
The high pressure enough is not enough.
How come insulation application prevent freezing!? JT effect lowers temperature near zero degree. Insulation prevents from gas to exchange or absorb heat from surroundings. So doesn't it have a reverse effect!? Kindly explain how insulation jacket around throttling valve prevent icing .
This process is useless for hydrogen, helium and neon at room temperature because there are (way) above their inversion temperature. For these gases you actually heat them up.
Hello, I learned a lot from your videos. Thank you for sharing!
I have a question to ask, can this valve withstand high temperature and high pressure? If so, is there any relevant research support?
Look forward to your reply, thank you very much !
The temperature and pressure ratings vary by valve-type, and by which rubber-goods are used. The valve used in the video is one of our 2" High pressure control valves with NPT connections, giving it a Maximum pressure rating of 2000 PSIG. With our standard rubber goods, this valve can be used in service with temperatures ranging between -20*F to 225*F. For more information on how options affect temperature and pressure ratings, you can take a look on the site or in our online catalog.
About gas catalytic heaters to prevent freezing: blog.kimray.com/gas-catalytic-heater-to-prevent-freezing/
Fahrenheit? Lol
Are you Indian?
No, our headquarters are in Oklahoma City, Oklahoma. We do have a global market however and do business and training with many countries, including India.
Look at the units used, that on its on is pretty telling
@@KimrayInc How come insulation application prevent freezing!? JT effect lowers temperature near zero degree. Insulation prevents from gas to exchange or absorb heat from surroundings. So doesn't it have a reverse effect!? Kindly explain how insulation jacket around throttling valve prevent icing .
its totes irritating watching an american made educational video and they dont use metric