Physics question (boiling in a vacuum)
I used mineral spirts to clean out my truck ac system. (flush) as well as follwed that with brake cleaner and then dry compressed air. (all I had availabnle)
Question. If any trace mineral spirits were left in the system, will these be boiled off when vacuuming with a vacuum pump? |
Physics question (boiling in a vacuum)
"stryped" wrote in message ... I used mineral spirts to clean out my truck ac system. (flush) as well as follwed that with brake cleaner and then dry compressed air. (all I had availabnle) Question. If any trace mineral spirits were left in the system, will these be boiled off when vacuuming with a vacuum pump? Let some evaporate from a clean glass jar and see if it leaves a waxy film. jsw |
Physics question (boiling in a vacuum)
On 18/06/2012 13:33, stryped wrote:
I used mineral spirts to clean out my truck ac system. (flush) as well as follwed that with brake cleaner and then dry compressed air. (all I had availabnle) Question. If any trace mineral spirits were left in the system, will these be boiled off when vacuuming with a vacuum pump? Depends on how good your vacuum is, but yes, basically. If you are concerned that a significant amount might be present in (say) a heat exchanger you can speed things up by warming it with a hot air gun. Do you have a gauge on your vacuum pump? |
Physics question (boiling in a vacuum)
Should be OK. If you can pull 400 microns or less. Mineral spirits has a low
boiling point, and should clear out. Christopher A. Young Learn more about Jesus www.lds.org .. "stryped" wrote in message ... I used mineral spirts to clean out my truck ac system. (flush) as well as follwed that with brake cleaner and then dry compressed air. (all I had availabnle) Question. If any trace mineral spirits were left in the system, will these be boiled off when vacuuming with a vacuum pump? |
Physics question (boiling in a vacuum)
On Monday, June 18, 2012 7:33:59 AM UTC-5, stryped wrote:
I used mineral spirts to clean out my truck ac system. (flush) as well as follwed that with brake cleaner and then dry compressed air. (all I had availabnle) Question. If any trace mineral spirits were left in the system, will these be boiled off when vacuuming with a vacuum pump? My guage shoes 28-29 HG. Does brake cleaner have the same low boiling point? |
Physics question (boiling in a vacuum)
"Stormin Mormon" fired this volley
in : Should be OK. If you can pull 400 microns or less. Mineral spirits has a low boiling point, and should clear out. Except that "mineral spirits" is a generic name for a fairly narrow range of solvents that may or may not contain dissolved higher fractions like non-volatile oils, greases, and paraffins. Many (not all) hardware store mineral spirits leave a waxy residue upon drying. Lloyd |
Physics question (boiling in a vacuum)
"Stormin Mormon" fired this volley in
: If you can pull 400 microns or less Stormy, that was as meaningless to him as if you'd said, "use a three- pronged veebleforp to clean out the lines." LLoyd |
Physics question (boiling in a vacuum)
On Jun 18, 6:33*am, stryped wrote:
I used mineral spirts to clean out my truck ac system. (flush) as well as follwed that with brake cleaner and then dry compressed air. (all I had availabnle) Question. If any trace mineral spirits were left in the system, will these be boiled off when vacuuming with a vacuum pump? Eventually the volatiles will go, depends on how good a vacuum you can pull. Big question is what the stuff left behind when it evaporated. I recently did my van system, took about 8 hours pumping before vacuum stabilized, 80 degree weather. I'd used some mineral spirits for a flush of some of the parts. Hopefully nothing harmful was left, just a little PAG oil residue. Stan |
Physics question (boiling in a vacuum)
You need a micron gage, not an inch gage. To tell if you've got a good
vacuum. Christopher A. Young Learn more about Jesus www.lds.org .. "stryped" wrote in message ... Question. If any trace mineral spirits were left in the system, will these be boiled off when vacuuming with a vacuum pump? My guage shoes 28-29 HG. Does brake cleaner have the same low boiling point? |
Physics question (boiling in a vacuum)
You know, sadly, I'm sure you are right.
Ah, well. That was a waste of plain text. Christopher A. Young Learn more about Jesus www.lds.org .. "Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote in message . 3.70... "Stormin Mormon" fired this volley in : If you can pull 400 microns or less Stormy, that was as meaningless to him as if you'd said, "use a three- pronged veebleforp to clean out the lines." LLoyd |
Physics question (boiling in a vacuum)
"Stormin Mormon" wrote in message ... You need a micron gage, not an inch gage. To tell if you've got a good vacuum. Christopher A. Young A 'full' vacuum reading on an inch scale would be the same as the barometer reading, assuming both gauges are accurate, which is very unlikely outside a lab. My barometer shows 30.56" right now so 28-29" of vacuum wouldn't be very good. The inch and micron numbers are heights of a column of mercury balanced against gas pressure, relative to either normal air pressure (29" lower) or a perfect vacuum (400 microns higher) depending on how the gauge is made. 400 microns is 0.01". jsw |
Physics question (boiling in a vacuum)
On Mon, 18 Jun 2012 08:49:35 -0700 (PDT), Stanley Schaefer
wrote: On Jun 18, 6:33*am, stryped wrote: I used mineral spirts to clean out my truck ac system. (flush) as well as follwed that with brake cleaner and then dry compressed air. (all I had availabnle) Question. If any trace mineral spirits were left in the system, will these be boiled off when vacuuming with a vacuum pump? Eventually the volatiles will go, depends on how good a vacuum you can pull. Big question is what the stuff left behind when it evaporated. I recently did my van system, took about 8 hours pumping before vacuum stabilized, 80 degree weather. I'd used some mineral spirits for a flush of some of the parts. Hopefully nothing harmful was left, just a little PAG oil residue. Stan Unfortunately "hope" don't feed the bulldogs. And as you found with the vacuum pump, if any volatiles are left behind they take a long time to boil off and get carried out. Most people don't bother pulling more than a token hard vacuum, or worse they use one of those air venturi "vacuum pumps" that isn't worth a plug nickel to "evacuate" a car system. And then they don't bother to change out the Filter/Drier and leave the old saturated one in - and wonder why the new compressor goes bad too. They make special high-purity HVAC System flushing solvents for this purpose and they are formulated specifically to not leave any harmful deposits and to evaporate out quickly. That's NOT the time to start playing "Mister Wizard" and experimenting with the home chemistry set. -- Bruce -- |
Physics question (boiling in a vacuum)
"Jim Wilkins" wrote in message ... 400 microns is 0.01". Oops, mental math mistake. 0.016" (0.015748") http://www.kylesconverter.com/mass/microns-to-inches jsw |
Physics question (boiling in a vacuum)
Gunner Asch on Mon, 18 Jun 2012 14:42:29 -0700
typed in rec.crafts.metalworking the following: On Mon, 18 Jun 2012 10:17:04 -0700, "Bruce L. Bergman (munged human readable)" wrote: On Mon, 18 Jun 2012 08:49:35 -0700 (PDT), Stanley Schaefer wrote: On Jun 18, 6:33*am, stryped wrote: I used mineral spirts to clean out my truck ac system. (flush) as well as follwed that with brake cleaner and then dry compressed air. (all I had availabnle) Question. If any trace mineral spirits were left in the system, will these be boiled off when vacuuming with a vacuum pump? Eventually the volatiles will go, depends on how good a vacuum you can pull. Big question is what the stuff left behind when it evaporated. I recently did my van system, took about 8 hours pumping before vacuum stabilized, 80 degree weather. I'd used some mineral spirits for a flush of some of the parts. Hopefully nothing harmful was left, just a little PAG oil residue. Stan Unfortunately "hope" don't feed the bulldogs. And as you found with the vacuum pump, if any volatiles are left behind they take a long time to boil off and get carried out. Most people don't bother pulling more than a token hard vacuum, or worse they use one of those air venturi "vacuum pumps" that isn't worth a plug nickel to "evacuate" a car system. And then they don't bother to change out the Filter/Drier and leave the old saturated one in - and wonder why the new compressor goes bad too. They make special high-purity HVAC System flushing solvents for this purpose and they are formulated specifically to not leave any harmful deposits and to evaporate out quickly. That's NOT the time to start playing "Mister Wizard" and experimenting with the home chemistry set. -- Bruce -- What..a can of WD-40 spritzed into the system or a bottle of GumOut carby cleaner wont do the job????? VBG Gunner, who has seen the results of both being used..... I take it, they are "less than sub-optimal"? -- pyotr Go not to the Net for answers, for it will tell you Yes and no. And you are a bloody fool, only an ignorant cretin would even ask the question, forty two, 47, the second door, and how many blonde lawyers does it take to change a lightbulb. |
Physics question (boiling in a vacuum)
I stopped reading when it became aparent that you thought an inch gage could
read vacuums. Christopher A. Young Learn more about Jesus www.lds.org .. "Jim Wilkins" wrote in message ... "Jim Wilkins" wrote in message ... 400 microns is 0.01". Oops, mental math mistake. 0.016" (0.015748") http://www.kylesconverter.com/mass/microns-to-inches jsw |
Physics question (boiling in a vacuum)
"Stormin Mormon" wrote in news:eMQDr.55131$F%
: I stopped reading when it became aparent that you thought an inch gage could read vacuums. What makes you think it can't? |
Physics question (boiling in a vacuum)
"Jim Wilkins" wrote in message ... "Jim Wilkins" wrote in message ... 400 microns is 0.01". Oops, mental math mistake. 0.016" (0.015748") http://www.kylesconverter.com/mass/microns-to-inches jsw Yeah, I noticed that but figured you were thinking the other way (microinches to mm) |
Physics question (boiling in a vacuum)
Gunner Asch on Tue, 19 Jun 2012 00:09:53 -0700
typed in rec.crafts.metalworking the following: On Mon, 18 Jun 2012 17:06:54 -0700, pyotr filipivich wrote: Gunner Asch on Mon, 18 Jun 2012 14:42:29 -0700 typed in rec.crafts.metalworking the following: On Mon, 18 Jun 2012 10:17:04 -0700, "Bruce L. Bergman (munged human readable)" wrote: On Mon, 18 Jun 2012 08:49:35 -0700 (PDT), Stanley Schaefer wrote: On Jun 18, 6:33*am, stryped wrote: I used mineral spirts to clean out my truck ac system. (flush) as well as follwed that with brake cleaner and then dry compressed air. (all I had availabnle) Question. If any trace mineral spirits were left in the system, will these be boiled off when vacuuming with a vacuum pump? Eventually the volatiles will go, depends on how good a vacuum you can pull. Big question is what the stuff left behind when it evaporated. I recently did my van system, took about 8 hours pumping before vacuum stabilized, 80 degree weather. I'd used some mineral spirits for a flush of some of the parts. Hopefully nothing harmful was left, just a little PAG oil residue. Stan Unfortunately "hope" don't feed the bulldogs. And as you found with the vacuum pump, if any volatiles are left behind they take a long time to boil off and get carried out. Most people don't bother pulling more than a token hard vacuum, or worse they use one of those air venturi "vacuum pumps" that isn't worth a plug nickel to "evacuate" a car system. And then they don't bother to change out the Filter/Drier and leave the old saturated one in - and wonder why the new compressor goes bad too. They make special high-purity HVAC System flushing solvents for this purpose and they are formulated specifically to not leave any harmful deposits and to evaporate out quickly. That's NOT the time to start playing "Mister Wizard" and experimenting with the home chemistry set. -- Bruce -- What..a can of WD-40 spritzed into the system or a bottle of GumOut carby cleaner wont do the job????? VBG Gunner, who has seen the results of both being used..... I take it, they are "less than sub-optimal"? That would be a fair assesment though not descriptive of the sound of bearings destroying themselves when the engine was started and the little "AC/Max" button pressed. I will keep that in mind for this summer's project. (Sheesh. Even I know that WD-40 is _not_ a lubricant, _or_ a solvent.) -- pyotr Go not to the Net for answers, for it will tell you Yes and no. And you are a bloody fool, only an ignorant cretin would even ask the question, forty two, 47, the second door, and how many blonde lawyers does it take to change a lightbulb. |
Physics question (boiling in a vacuum)
I'll set up four systems. Two will have a 400 micron vacuum, two will have
1,000 micron vacuum. Use your inch gage to tell which is which. Christopher A. Young Learn more about Jesus www.lds.org .. "Doug Miller" wrote in message . .. "Stormin Mormon" wrote in news:eMQDr.55131$F% : I stopped reading when it became aparent that you thought an inch gage could read vacuums. What makes you think it can't? |
Physics question (boiling in a vacuum)
Young's Law of usenet: After Nazis have been invoked and called forth from the spirit world, someone is sure to mention WD-40. The debate "is it a lubricant or water displacer" is not complete until someone explains what the letters abbrev. for. Points are earned by quoting usenet posters of old, Aristotle, or your own personal experiences with WD-40. Web pages abound, and are on topic for the debate. Regardless of how worthy an argument is, no one is allowed to change sides. The debate must continue to eternity. -- Christopher A. Young Learn more about Jesus www.lds.org .. .. "pyotr filipivich" wrote in message ... That would be a fair assesment though not descriptive of the sound of bearings destroying themselves when the engine was started and the little "AC/Max" button pressed. I will keep that in mind for this summer's project. (Sheesh. Even I know that WD-40 is _not_ a lubricant, _or_ a solvent.) -- pyotr |
Physics question (boiling in a vacuum)
On 6/18/2012 5:42 PM, Gunner Asch wrote:
What..a can of WD-40 spritzed into the system or a bottle of GumOut carby cleaner wont do the job????? If it ain't broke, you didn't use enough WD-40!!! |
Physics question (boiling in a vacuum)
"Stormin Mormon" wrote in message
... I'll set up four systems. Two will have a 400 micron vacuum, two will have 1,000 micron vacuum. Use your inch gage to tell which is which. Christopher A. Young There's no rule that inch-graduated gauges have to be crude. My inch gauge is a Dwyer model 2001 like the top left. It displays the draft of my wood stove: http://www.dwyer-inst.com/Products/P...eName=Ordering One minor division is 0.02" of Water Column, or ~0.0015" (~38 microns) of mercury. So the 600 micron difference would show plainly at around 3/10 of full scale. jsw |
Physics question (boiling in a vacuum)
On Tue, 19 Jun 2012 11:22:37 -0400, "Jim Wilkins"
wrote: "Stormin Mormon" wrote in message . .. I'll set up four systems. Two will have a 400 micron vacuum, two will have 1,000 micron vacuum. Use your inch gage to tell which is which. Christopher A. Young There's no rule that inch-graduated gauges have to be crude. My inch gauge is a Dwyer model 2001 like the top left. It displays the draft of my wood stove: http://www.dwyer-inst.com/Products/P...eName=Ordering One minor division is 0.02" of Water Column, or ~0.0015" (~38 microns) of mercury. So the 600 micron difference would show plainly at around 3/10 of full scale. jsw This is not my department, but some common petrochemicals, including the heavier solvents like Stoddard Solvent, have vapor pressures below 400 microns (0.4 mm) Hg. You won't get them out of the system with a vacuum on that order, if I understand the problem. 'Just thought I'd throw a wrench in here...d8-) -- Ed Huntress |
Physics question (boiling in a vacuum)
Ed Huntress fired this volley in
: You won't get them out of the system with a vacuum on that order, if I understand the problem. That's why a good pump with a fresh oil change will do 20 microns. Mine will, and I only paid $169 for it. I'm not happy with a system until it will hold 50 microns after I turn off the pump. Lloyd |
Physics question (boiling in a vacuum)
"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote in message . 3.70... Ed Huntress fired this volley in : You won't get them out of the system with a vacuum on that order, if I understand the problem. That's why a good pump with a fresh oil change will do 20 microns. Mine will, and I only paid $169 for it. I'm not happy with a system until it will hold 50 microns after I turn off the pump. Lloyd What do you use to measure 50 microns? My best 6" diameter mechanical absolute pressure gauge stops at 100, and I don't have mercury for a McLeod gauge. |
Physics question (boiling in a vacuum)
"Jim Wilkins" fired this volley in news:jrq7nj$15n
: What do you use to measure 50 microns? My best 6" diameter mechanical absolute pressure gauge stops at 100, and I don't have mercury for a McLeod gauge. A thermistor micron gauge. It heats a thermistor with a regulated voltage through a fairly high- value precision (and temperature compensated) resistor, introducing a variable (very small) current depending upon the thermistor's temperature. Gas molecules rob heat from it, changing the resistance, and thus changing the current, which is measured to determine the state of the thermistor. They can go down to 2 microns with very good accuracy. Mine is a Robinaire, and cost about $90 from a discounter. Lloyd |
Physics question (boiling in a vacuum)
"Stormin Mormon" wrote in news:7GZDr.7949
: I'll set up four systems. Two will have a 400 micron vacuum, two will have 1,000 micron vacuum. Use your inch gage to tell which is which. Now you're changing the conditions. Originally, you suggested that a gauge reading in inches couldn't be used to measure vacuum, which it obviously can. |
Physics question (boiling in a vacuum)
"Jim Wilkins" wrote in message ... One minor division is 0.02" of Water Column, or ~0.0015" (~38 microns) of mercury. So the 600 micron difference would show plainly at around 3/10 of full scale. jsw More explicitly; 600 microns = 0.6mm, or 0.6 * .03937 = 0.0236" of Hg, or 13.6 * 0.0236" = 0.32" of water, to the nearest scale division. The full scale on that gauge is 1" of water. jsw |
Physics question (boiling in a vacuum)
On 06/19/2012 04:48 AM, Stormin Mormon wrote:
Young's Law of usenet: After Nazis have been invoked and called forth from the spirit world, someone is sure to mention WD-40. The debate "is it a lubricant or water displacer" is not complete until someone explains what the letters abbrev. for. Points are earned by quoting usenet posters of old, Aristotle, or your own personal experiences with WD-40. Web pages abound, and are on topic for the debate. Regardless of how worthy an argument is, no one is allowed to change sides. The debate must continue to eternity. WD-40 was originally developed to keep rust off of the Saturn V rocket. And who do you suppose developed the Saturn V rocket? Nazis. It all comes full circle. Jon |
Physics question (boiling in a vacuum)
I had to go look. Your comment sounds reasonable. But, it was Atlas missile,
in 1953. http://inventors.about.com/od/wstart...a/WDFourty.htm Christopher A. Young Learn more about Jesus www.lds.org .. "Jon Danniken" wrote in message ... On 06/19/2012 04:48 AM, Stormin Mormon wrote: Young's Law of usenet: After Nazis have been invoked and called forth from the spirit world, WD-40 was originally developed to keep rust off of the Saturn V rocket. And who do you suppose developed the Saturn V rocket? Nazis. It all comes full circle. Jon |
Physics question (boiling in a vacuum)
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