|08-10-2008 10:30 AM|
These are the parts you plan to use? If so you should be able to put together a good workable system. This is a heck of a lot different than what usually is asked about, using something like a shop vac or compressor air for the air supply. Compressor air is inherently dangerous for several reasons that MUST be taken into consideration and dealt with before using which more often than not will cost more than just buying a system. A shop vac, or even worse a home vac, has some major drawbacks too the biggest is the fact it spews out contaminated air no matter how clean the intake air is. If it is a used vac it will be contaminating the air with untold different kinds of trash from dust mites to whatever plus all kinds of debris from the mechanical parts (mostly the motor) as they go through the normal wear process. Someone using a vac of any kind may think they are breathing safe air when in fact they could very well be coating their lungs with all kinds of trash, plastics, carbon particles, copper particles, all kinds of electrical insulation and varnish, etc. A breathing air supply is not something to take lightly and if a person makes a mistake it could be a serious one so anyone contemplating doing this needs to realize they may be betting their health and maybe their very life that they did not overlook something.
|08-10-2008 06:34 AM|
Couldnt you just get a longer hose and run it outside? and breathe through it....kinda like in snorkling?
|08-10-2008 06:07 AM|
Thanks for all of the input so far, it is much appreciated. Keep it coming
I too have been SCBA certified for 25+ years. PADI certified for 20+ years. Been certified numerous times for full face respirators, every time I go to job site that has asbestos the General Contractor doesnt care about any cards in your pocket, you WILL take their selected course and cert. ( The only reason my wallet is thick, cuz there are few greenbacks in it,lol)
AccuSpray 240 turbine, note the turbine intake is through its own filter with a bulkhead between it and the cooling air to the turbine motor;
Set the airflow:
They sell a hood identical to this except it is made of a vinyl material for added durability for an additional $5 fee. Either hood assy. comes with 5 face shield protectors.
|08-09-2008 11:47 PM|
Oldred covered it pretty good, and I guess about the only thing that I could add, if you make up your own system, I would have somebody watching you all the time that you are using it.
Just don't take the supplied air lightly, even the boughten systems, and don't forget, anything that comes through that hose is going directly into your lungs, this is some serious stuff here guys.
There is a lot to learn about supplied air, and how to use a respirator, and I know everybody isn't retired like I am, and has the time to read about it.
I also know there are a lot of guys on here a whole lot smarter then I am and can probably build a working system, but even a good working system has its pitfalls wether its homemade or boughten.
Some of you have read this before, but in case you haven't, I'll put it out again, its just brushing the surface on respirators, but every little bit helps.
Here it is. http://www.1969supersport.com/respirators.html
|08-09-2008 08:27 PM|
I am also curious if anyone has tried using a CPAP machine for fresh air. This is a medical device for sleep apnea, it forces air into your mouth or nose to eliminate snoring. Since it is a medical device it is obviously safe. I plan on steeling it from the wife the next time I paint in my garage and using a different hood or mask. Has anyone else thought of this before? What would be a good hood or mask to use?
|08-09-2008 03:16 PM|
|oldred||Just to add a little more about the mask/hood, I don't think it would be a good idea at all to use any kind of sealing mask with high pressure air, on a home built system anyway. By high pressure I mean any pressure higher than what would be safe to breath. A loose fitting hood of course would eliminate any potential over-pressure problems and would make the system simpler to design and much safer. IMO for what something like a Hobbyair system costs it would just be good insurance and eliminate the "what ifs" and when you subtract what you will spend building one it should not cost all that much more.|
|08-09-2008 02:53 PM|
I believe the Accuspray system has a separate air intake through the filter and does not draw air across the motor which is good.
You also need to make sure that your hose to pump connection does not get overly hot as it could cause the hose to offgas potentially toxic vapors.
You are right in placing a y-valve to vent surplus air. 8psi is way too much. Many positive pressure SCBA systems have a static pressure of only .9-1.4psi in the facepiece. Of course the hood should allow extra air to exit without building up pressure.
I built a fresh air system using an Ametek motor and pump (the same as the one in the Hobbyair system), light ribbed medical ventilator hose and a MSA mask. It works absolutely great. With a full hooded bunny suit, gloves and the fresh air system I feel very safe from iso's (but hot!).
If you can restore a car, you can build a fresh air system. It's not rocket science but you have to use due diligence, understand what you are doing and know the risks you are taking. Actually, for most people it is better to buy a system as the cost of the parts can approach that of a ready made system. You have the motor assembly already so it makes financial sense to make your own. I lucked out on a great deal on the motor and I had the mask already.
|08-09-2008 02:35 PM|
Most likely not but the air would still need to be filtered and it should not be attached to a sealing type face mask unless it used with an approved type regulator designed for breathing air. A regulator failure on the line going to a sealed face respirator could easily cause serious injury or even be fatal and a regulator designed for normal air use would not be nearly accurate or dependable enough at pressures that low.
|08-09-2008 01:45 PM|
|scrimshaw||Very interesting, I would never of guessed that would be a problem. Do you think that 'oil-less compressors' would still be susceptible to this problem?|
|08-09-2008 01:27 PM|
I have heard a couple of different explanations about what causes this and one night at a mine safety training class I attended there were two MSHA "experts" on mine air quality that nearly exchanged blows after a heated argument about the reason the Carbon Monoxide is present but there was no disagreement about whether or not it is there, the fact that the monitors are on the compressor systems bears that out. In most (but not ALL!) cases the levels are low enough to not be dangerous but without the monitor you would have no way of knowing. It is my understanding it forms when air containing contaminants (contaminants in the intake air plus oil, carbon build-up, etc from the pump) is compressed and heated by the pump. In any case it is there but the real question would be in what amounts? I thought I would do a quick search at OSHA and see what I could find and turned up a lot of info, here are a few from OSHA and some I just came up with on the net.
http://www.ecompressedair.com/librar...controls.shtml (bottom of page)
|08-09-2008 12:22 PM|
Can you explain why?
|08-09-2008 11:46 AM|
|08-09-2008 11:32 AM|
|shine||i was wondering why the carbon monoxide smelled so bad . my exposure in the booth is about like a trip to dfw and the air there. i'm really wanting to finish the a/c unit|
|08-09-2008 09:57 AM|
No No, you are supposed to use NEW toilet paper!!!
Carbon Monoxide is a real danger when using an air compressor and a filter won't help that, a Carbon Monoxide monitor should always be incorporated into the system.
|08-09-2008 09:47 AM|
|shine||what ever you use get a good filter set up. my last filter is an old toilet paper filter. compressed air is not really the way to go but i figure i only use it several times a year for short periods. i have a new set up going together for the blast booth using a squirrel cage and ice bucket. need some a/c in there my use it in the paint booth.|
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