Re: all about Air Compressors

Man, what a bummer, :nerves:>:( hopefully your Vespa gets fixed upon replacement of that air valve switch. Hope there will be no more upcoming defects in the days to come, cross your fingers and knock on wood !!! :superman:

Again, GOOD LUCK to you !

Re: all about Air Compressors

Went there earlier and the clerks there are kind enough to replace the crappy fittings that broke to a brand new brass ones then went home. When I was fitting the air filter's connection to the air valve of the compressor, there is still a massive air leak coming out. I inspected where the leak was coming from and found a crack underneath the valve. Will go back again tonight for a replacement as I really want to start painting my kits as soon as the compressor is up and running.

This is a classic case of over tightening. If the vendor failed to notice this then check very well the replacement they will give you to avoid inconvenience. When installing tighten the valve by hand pressure then when you feel that you have reached the threshold of the thread turn, slightly tighten with a wrench by 1/8 turn. Leak test it at 50 PSI. if there are no leaks then tighten another 1/8 turn and test for leak. If there is no leak leave it as it is. Don't over fill with Teflon. About 2-3 wraps will do 'coz if you over wrap with Teflon this will also contribute to the cracking. Sometimes if the thread fit is really good and seamless I use a thread lock seal like Loctite or Selleys in place of Teflon. if you can ask for a better brand of fitting whether it is more expensive I'd go for it.

Re: all about Air Compressors

Thank you for the feedback guys. Got my replacement air valve switch and I finally managed to set up my compressor without air leaks by adding some teflon and tightening the fit by hand pressure. Hopefully, smooth usage na from here on.

Re: all about Air Compressors

Always kept my compressor under a worktable so never inspected it, save for the occasional dewatering. While cleaaring up some space over the weekend, had to roll out the compressor and this is what I saw:

Seems sawdust clung on the surfaces around the pump because of some sticky film which I assume is oil. Or is it?

Any suggestions what I should do?

Compressor seems to work fine though.
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Re: all about Air Compressors

The yellow cap serves as a breather too. It's normal for oil to escape there as fumes and do accumulate over time. I see that it's now mixed with saw dust. None the less I see oil formation on the bottom part of the pump too. My first suspicion would be oil overfilling of the pump. For now I'd just clean the surroundings with WD-40, brush and cloth. Blow dry it then observe it from time to time to determine if there are some minute leaks on the pump itself.

Re: all about Air Compressors

Good day sirs,

I need some help... I have 2 identical compressors feeding a single air line, is there anyway wherein I can have the compressors operate alternately? My purpose for this is to even/balance the wear and tear of both compressors.

Is there an automatic switch, relay or any control device that will handle the alternating operation for the compressors?

I inquired over the net, the answer I got is about PLCs (programmable logic controller) not sure if that's what it is. I'm not so good with electronics stuff other replacing a broken light bulb. But can anyone share their opinion on this? Is PLC my only option aside from manually turning off/on the compressors?

Thanks and sorry if i posted on a wrong thread. (newbie):thanks:

Re: all about Air Compressors

you don't need programmable logic controller (PLC) to alternately run your pump. your controls need to have alternating relay like this:
http://ab.rockwellautomation.com/Relays-and-Timers/Alternating-Relays
http://www.macromatic.com/literature/catalog/pdf/?doc=arp_series.pdf
http://www.industrialelectronics.biz/macromatic/arp-1.html

But has to be wired by a professional.

Re: all about Air Compressors

Update on my Power Craft purchase

I got the unit today. Got it for 16.5k last price. It came with a free T-shirt, warranty card and manual.

Here are some pics of the compressor.

The unit stands around 4 feet. Consumes less space.

Two air outlet, each with a gauge. A quick coupler on the left controlled by an air regulator in the middle and a standard air cock on the right.

Warning label, product model number and specifications.

Close up view of the air filter assembly

hello guys,im newbie in this forum,id like to ask where i can buy powercraft 3hp 120L aircompressor here in metro manila? ganun parin kaya ang price 16.5k?

Re: all about Air Compressors

hi, saan pala pwede magpagawa ng tank ng air compressor? di na kasi maganda yung tank kasi napabayaan na nung di na ginagamit pero umaandar pa.vespa 1/4 HP yung compressor. matagal na samen yung air compressor gusto ko maayos ulit pra makapag spray paint inaalala ko lang baka dahil luma na yung tank di kayanin yung hangin sa loob.thx.

Re: all about Air Compressors

hi, saan pala pwede magpagawa ng tank ng air compressor? di na kasi maganda yung tank kasi napabayaan na nung di na ginagamit pero umaandar pa.vespa 1/4 HP yung compressor.sa tatay ko pa xa bale gusto ko lang ayusin.thx..

I don't know of anyone or any company who makes air compressor tanks. If you find one make sure the tanks they make are of good quality.

This is why:
https://www.google.com.ph/search?q=exploding+air+compressor&client=firefox-a&hs=v8z&rls=org.mozilla:en-US:official&channel=sb&biw=1854&bih=985&noj=1&source=lnms&tbm=isch&sa=X&ei=EKUNVOCCOoqMuATGl4CwCA&ved=0CAgQ_AUoAQ

If I were you, I'd just buy a reputable compressor brand, either brand new or used (but in very good condition).

Re: all about Air Compressors

why the air compressor tank explodes?to much air?I hope I will find a tank replacement.thx for the reply

good day guys!

what would be the minimum air compressor specs should i purchase for spray painting a car/car panels?

i've been doing some research and plan to paint my car and eventually put up a small paint shop business. thanks! 🙂

just want to share, I saw this article online on how to evaluate true horsepower and CFM rating of air compressors.
http://www.truetex.com/aircompressors.htm , it says on the article to time the amount of seconds from when
the compressor starts to cut in (which in my case a 2HP vespa 88 litre compressor) up to the time it cuts out. I timed the compressor from when
it started at 80PSI to 115PSi at 1 minute and 15 seconds or 75secs at a difference of 35PSI (115-80 = 35psi).

as per the formula it says to divide the tank capacity in gallons (88 litres = 23 gal approx) by 7.48 (1 cu-ft = 7.48gal)
or (23gal / 7.48 = 3.07486 cubic feet)

now in units of atmospheres of pressure, since 1 atm = 14.7 psi, the 35 psi of pressure added during the cycle is 35/14.7 = 2.38 atm of pressure during the cycle

"When a compressor pumps one "CFM" (cubic foot per minute), that means the intake port inhales one cubic foot of "free air" (air at atmospheric pressure,
which is 0 psig) per minute. (Note: A CFM does not mean in any sense the compressed volume.) So the unit really measures the mass of air flowing per minute,
not volume per minute, since a cubic foot of free air is a unit of mass. Some people labor under a stubborn misundertanding that these units refer to the flow
of compressed volume (as opposed to free air volume), but this is flatly wrong. The confusion arises because the term "cubic foot" sounds like a measure of volume,
when in fact this term in this context is an abbreviation for "the mass of a cubic foot of atmospheric air", which is a measure of mass."

Thus in one cycle, the rate at which air is being pumped into my tank, is the pressure rise times the volume of the tank,
or 3.07 cubic feet * 2.38 atm = 7.31 cubic feet per 75 seconds. To proportion the 75 seconds up to minutes, to get the pumped volume per minute,
multiply by 60/75, or 7.31 * 60/75 = 5.8 CFM (at 80 psig).

to avoid confusion here is whats applicable to our 2 hp 88 litre vespa's

TANK CAPACITY: 88 litres or approx 23gallons
cUT IN PSI: 80PSI
CUT OUT PSI: 115PSI
time from 80psi to 115psi = 75 seconds
charged 35psi for 75 seconds

CONVERT GAL TO CUBIC FT (1cu-ft = 7.48gal)

formula: (tank cap(gal) / 7.48)

(23 / 7.48 = 3.07 cubic feet tank capacity)

1 atmospheric pressure = 14.7 psi

FORMULA:
divide the amount of psi from cut in to cut out by 1 atmospheric pressure

(35psi / 14.7 = 2.38atm of pressure during the cycle)

to get the tru CFM of your compressor
formula:
multiply the tank capacity in converted cubic feet by the total atmospheric pressure in on cycle

(3.07 * 2.38 = 7.31 cubic feet in 75 seconds)

to get the exact cfm in one minute
multiply the total cfm by 60 (60seconds in 1minute) then divide by the number of seconds in one charge cycle

(7.31 * 60 / 75 = 5.85 cfm @80PSI)

THEREFORE MY 2 HORSE POWER 88 LITRE VESPA IS RATED FOR 5.85CFM @80PSI

where to buy 3HP powercraft 120l like in the post and same price 🙂

hello PHM! pano ba matanggal ang kalawang sa air tank? sa bawat drain ko kasi after use e parati may kasamang kalawang. pero hindi naman ganun katindi ang kalawang. e brand new naman yung compressor ko. ewan ko na lang kung "brand new repaint" yung binigay na 1hp powercraft ni rollins sakin.

plano ko din gawan ng cage yung compressor ko once na masettle down na yung mga plans at abubot sa garahe. nakakatakot din masabugan ng tanke kahit na well maintained yung compressor lalo na yung pressure switch.