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Vaccuum systems
I was wondering if anyone else has their vaccuum system connected by PVC
pipe and if so, do they have it grounded. Thanks, Kevin |
Vaccuum systems
Kevin Cleary wrote:
I was wondering if anyone else has their vaccuum system connected by PVC pipe and if so, do they have it grounded. Thanks, Kevin Yes and NO. I am using 4" PVC pipe overhead and do not have it grounded. Did you ever see the (Of all the things I have lost, I miss my mind the most!) - who are the two guys who test all the theories? - anyway, they did a segment on the static build up on PVC and found that it just does not build enough to give a significant discharge, if any at all. It seems PVC is really lousy at holding a charge. Deb |
Vaccuum systems
"Kevin Cleary" wrote: I was wondering if anyone else has their vaccuum system connected by PVC pipe and if so, do they have it grounded. ^^^^^^^^^^^^^^^^^ I have my vacuum hooked up with 1" flexible plastic tubing (Tygon) and it is not grounded. I don't see any need--there is not enough air flow in a vacuum line, even with minor leaks, to generate much static electricity. You really have to have dry air, vigorous motion and very good insulation to generate sparks. |
Vaccuum systems
In article d4pVi.5972$%r.1350@trnddc01,
"Kevin Cleary" wrote: I was wondering if anyone else has their vaccuum system connected by PVC pipe and if so, do they have it grounded. Thanks, Kevin I guess I need to ask, which kind? Dust collection or vacuum clamping? -- -------------------------------------------------------- Personal e-mail is the n7bsn but at amsat.org This posting address is a spam-trap and seldom read RV and Camping FAQ can be found at http://www.ralphandellen.us/rv |
Vaccuum systems
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Vaccuum systems
"Dr. Deb" wrote: Yes and NO. I am using 4" PVC pipe overhead and do not have it grounded. Did you ever see the (Of all the things I have lost, I miss my mind the most!) - who are the two guys who test all the theories? - anyway, they did a segment on the static build up on PVC and found that it just does not build enough to give a significant discharge, if any at all. It seems PVC is really lousy at holding a charge. The two guys you are thinking of are Adam Savage, And Jamie Hyneman, from the Mythbusters. While they did prove PVC has a hard time holding a significant charge, I personally like to ground my vacuum tubing. As all it takes is one small spark and the right dust condisitions to create a potential flash fire. But thats just my two cents. Donald Vivian |
Vaccuum systems
On Mon, 29 Oct 2007 20:54:06 GMT, "Leo Lichtman"
wrote: "Kevin Cleary" wrote: I was wondering if anyone else has their vaccuum system connected by PVC pipe and if so, do they have it grounded. ^^^^^^^^^^^^^^^^^ I have my vacuum hooked up with 1" flexible plastic tubing (Tygon) and it is not grounded. I don't see any need--there is not enough air flow in a vacuum line, even with minor leaks, to generate much static electricity. You really have to have dry air, vigorous motion and very good insulation to generate sparks. Good point, Leo... we've been at about 20% humidity for a week or so and the cats have gotten shocked enough to be afraid of us, but they haven't burst into flames yet.. I take a lot more precautions for static shock around the computers then the shop.. mac Please remove splinters before emailing |
Vaccuum systems
I really meant to label this dust collection not vaccum system.
"Kevin Cleary" wrote in message news:d4pVi.5972$%r.1350@trnddc01... I was wondering if anyone else has their vaccuum system connected by PVC pipe and if so, do they have it grounded. Thanks, Kevin |
Vaccuum systems
In article 8fNVi.24511$eD3.20181@trnddc03,
"Kevin Cleary" wrote: I really meant to label this dust collection not vaccum system. "Kevin Cleary" wrote in message news:d4pVi.5972$%r.1350@trnddc01... I was wondering if anyone else has their vaccuum system connected by PVC pipe and if so, do they have it grounded. Thanks, Kevin There is a difference. While the PCV in a pipe can build little charge, this is NOT true for the dust moving through the pipe. That's where the real danger is. The pro's recommend a bare wire through the pipe for that reason -- -------------------------------------------------------- Personal e-mail is the n7bsn but at amsat.org This posting address is a spam-trap and seldom read RV and Camping FAQ can be found at http://www.ralphandellen.us/rv |
Vaccuum systems
So its best to wrap grounding wire around the PVC and then attach it to a
groounding rod? Kevin "Ralph E Lindberg" wrote in message ... In article 8fNVi.24511$eD3.20181@trnddc03, "Kevin Cleary" wrote: I really meant to label this dust collection not vaccum system. "Kevin Cleary" wrote in message news:d4pVi.5972$%r.1350@trnddc01... I was wondering if anyone else has their vaccuum system connected by PVC pipe and if so, do they have it grounded. Thanks, Kevin There is a difference. While the PCV in a pipe can build little charge, this is NOT true for the dust moving through the pipe. That's where the real danger is. The pro's recommend a bare wire through the pipe for that reason -- -------------------------------------------------------- Personal e-mail is the n7bsn but at amsat.org This posting address is a spam-trap and seldom read RV and Camping FAQ can be found at http://www.ralphandellen.us/rv |
Vaccuum systems
"Kevin Cleary" wrote in message news:oR_Vi.7057$Q%3.4249@trnddc04... So its best to wrap grounding wire around the PVC and then attach it to a groounding rod? Grounding insulators is a tough task. PVC is a pretty good insulator. Not to mention that wrapping the outside will do even less for the inside than the out. The "pro's" (sic) still haven't produced a single instance of dust explosion in a sanding dust pipe, and the science says the density, particle size and heat of the spark which would jump from the pipe to the interior ground (?) are not likely to hit a perfect combination, even if they were the proper charges http://www.esdsystems.com/training/staticgeneration.htm. |
Vaccuum systems
no, no, no, no.
if you are going to do this at all, you need the wire inside the pipe - I'd use steel instrument wire because it will resist the dust abrasion, and I'd drill a little tiny hole in the pipe occasionally to "sew" the wire through so it stays on the side of the pipe. or, there is conductive pipe available - frequently the black pipe is conductive enough to prevent static build up, but you would want to check this via the specifications. You can attach the wire to any ground, a rod, the conduit in which you electrical power runs, a water pipe, etc. "Kevin Cleary" wrote in message news:oR_Vi.7057$Q%3.4249@trnddc04... So its best to wrap grounding wire around the PVC and then attach it to a groounding rod? Kevin "Ralph E Lindberg" wrote in message ... In article 8fNVi.24511$eD3.20181@trnddc03, "Kevin Cleary" wrote: I really meant to label this dust collection not vaccum system. "Kevin Cleary" wrote in message news:d4pVi.5972$%r.1350@trnddc01... I was wondering if anyone else has their vaccuum system connected by PVC pipe and if so, do they have it grounded. Thanks, Kevin There is a difference. While the PCV in a pipe can build little charge, this is NOT true for the dust moving through the pipe. That's where the real danger is. The pro's recommend a bare wire through the pipe for that reason -- -------------------------------------------------------- Personal e-mail is the n7bsn but at amsat.org This posting address is a spam-trap and seldom read RV and Camping FAQ can be found at http://www.ralphandellen.us/rv -- Posted via a free Usenet account from http://www.teranews.com |
Vaccuum systems
Asking isn't the same as thinking, but it's a fair substitute and easier
for me, so: ******************************************** How abrasive is the dust from a woodturning shop at the dust removal velocities encountered in a turning shop? Does it abrade PVC walls? Between the fixed PVC and the moving dust are electrons stripped off some or all of the dust particles or they stripped off the PVC? IOW, is the charge (voltage) between dust and PVC tubing or between dust particles? Does living in areas of high humidity remove/lessen the possibility of explosion from shop dust? Is there a correlation between relative humidity and charging of dust moving in turning shop dust removal situations'? Is the threshold RH known? What is the ground wire inside the PVC pipe supposed to prevent; ie. does the dust burn like gasoline vapor in a car's engine or does it explode, whatever the difference is. Would a humidifier reduce the risk of explosion in dry climes or would it just make the turner uncomfortable and rust all his tools? I know there are supposed to be no foolish questions, but asking without thinking produced the above. Sorry. :) Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
Vaccuum systems
Hi jev, I appreciate your response, but I'm unsure of your intent. I
thought these were legitimate questions and I don't like to assume knowledge which I have not. Did the site you suggested not get posted or did you refer to mine in some way ? If you were not pleased, I regret the misunderstanding, but I still would appreciate answers from someone who knows. I could look it up, but better to get a friendly reply from a woodturner's slant. Thanks in advance for your explanation. Regards, Arch |
Vaccuum systems
On Fri, 2 Nov 2007 11:00:17 -0400, (Arch) wrote:
Hi jev, I appreciate your response, but I'm unsure of your intent. I thought these were legitimate questions and I don't like to assume knowledge which I have not. Did the site you suggested not get posted or did you refer to mine in some way ? If you were not pleased, I regret the misunderstanding, but I still would appreciate answers from someone who knows. I could look it up, but better to get a friendly reply from a woodturner's slant. Thanks in advance for your explanation. Regards, Arch Sorry forgot to post the link - my apologies http://mywebpages.comcast.net/rodec/...s.html#summary |
Vaccuum systems
Wow! What a great link. Many thanks, jev. Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
Vaccuum systems
Jev,
That was quite an article. Thanks, Kevin "jev" wrote in message ... On Fri, 2 Nov 2007 11:00:17 -0400, (Arch) wrote: Hi jev, I appreciate your response, but I'm unsure of your intent. I thought these were legitimate questions and I don't like to assume knowledge which I have not. Did the site you suggested not get posted or did you refer to mine in some way ? If you were not pleased, I regret the misunderstanding, but I still would appreciate answers from someone who knows. I could look it up, but better to get a friendly reply from a woodturner's slant. Thanks in advance for your explanation. Regards, Arch Sorry forgot to post the link - my apologies http://mywebpages.comcast.net/rodec/...s.html#summary |
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