It is currently 28 Mar 2024, 20:26
9fingers wrote:A standard capacitor run motor* switched with a solid state relay will be fully explosion proof and cost nothing like the one you link to.
Bob
* this is a common type used on fans as fans have low torque needs for start up.
Craig Salisbury wrote:Alas i feel my ebay skills are not up to par, I have been looking for one of these for quite some time hoping for a used bargain. I can get one that fits in a wall but that really isn't an option although half the price.
9fingers wrote:Craig Salisbury wrote:Alas i feel my ebay skills are not up to par, I have been looking for one of these for quite some time hoping for a used bargain. I can get one that fits in a wall but that really isn't an option although half the price.
Surely you can come up with a stand/box etc for a wall one. t'aint rocket science?
As for ebay, set up a search with afew key words and you can get a daily email listing likely candidates, if you are not seeing what you want then just adjust the search words.
Bob
Craig Salisbury wrote:9fingers wrote:Craig Salisbury wrote:Alas i feel my ebay skills are not up to par, I have been looking for one of these for quite some time hoping for a used bargain. I can get one that fits in a wall but that really isn't an option although half the price.
Surely you can come up with a stand/box etc for a wall one. t'aint rocket science?
As for ebay, set up a search with afew key words and you can get a daily email listing likely candidates, if you are not seeing what you want then just adjust the search words.
Bob
goddammit bob you pushed me. i will get orf my arris buy the cheaper one and build a box for it....on wheels no less.
I really need to stop being lazy.
9fingers wrote:A standard capacitor run motor* switched with a solid state relay will be fully explosion proof and cost nothing like the one you link to.
Bob
* this is a common type used on fans as fans have low torque needs for start up.
novocaine wrote:I have to ask, what is it Ex rated to? no where does it give you what it's protected against. is it cat II or Cat III rated? what temperature class is it designed for? can I bung hydrogen through it and not worry? or is it only for methane?
don't want to dig in to this one to much but in short, you don't need that, you need want low level input (air being pushed in to the space) and high level output (non driven) with a filter on the input to stop contamination and a filter on the out to stop pollution.
this way you can use a lower category drive, as your zone 1 will extend to the boundary of a small spray booth and not beyond it. if you are going to force evacuated the space then you need to make sure the flammable mixtures is below LFL before it hits the fan, so big inlets are a must.
the actual zone from a spray gun that's running correctly is less than 1m from the tip in a cone shape, if your spray area is well ventilated the LFL shouldn't be reached beyond this.
these small spray booths that are popping up for things like guitars with drawn air ventilation have to meet cat II.
I'm stopping before I type a whole EPD. basically, have a think about why you need this and if there's a better option.
novocaine wrote:The smell is from overspray gassing off, this won't fix that (if it did you'd have no finish on the item either).
easiest way to fix that is to sheet everything including floor and ceiling, spray then chuck the sheeting out straight away.
let me have a think about this as I don't want to give you incorrect advice and I've not done a DSEAR assessment for a small spray booth for years (did do one for a very very very large one in last 2 years though:) )
normally though if you can keep the flammable atmosphere below 25% of the LFL (which is 3% for ethanol the largest constituent in fiddes pre cat) then it's a zone 2 which makes Ex rating of equipment much easier and I'd follow the same line as 9fingers. that means good ventilation (something like 10-15 air changes per hour i'd have thought but I'd need to run the calculations) I'd still go with force inlet to keep the fan out of the zone.
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