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Compressors what/which one do I need

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Compressors what/which one do I need
#1
Tasng4 Avatar
Tasng4 Neil Goodall
Lus La Croix Haute, Rhone Alps, France   FRA
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1966 Jaguar Mark X "Olive"
1966 Sunbeam Alpine
1973 Morris 1100 "Johnny"
1975 MG MGB GT    & more
Hi,
Can anyone help me decide what type/power/capacity of compressor I should buy?

For years I've been using 3 X 25ltr compressors connected in parallel, one of them has now died so I want to replace all of them with something which can handle blast cleaning. Previously I could blast for 30 seconds and them have to wait for 1.5 mins for the tanks to recharge.

I want to buy a compressor which can keep us with the amount of air blast cleaning uses. None of the tech specs seem to give the information I'm looking for. I know blast cleaning uses about 9cfm so ideally I want a compressor that can recharge faster than I'm using air - if that's possible. Also I only have a normal 2 phase supply (N.B. I'm in France where we use 230 volts.)

I really don't want to buy the wrong thing.

Thanks.

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Re: Compressors what/which one do I need
#2
Paul J Avatar
Paul J Silver Member
Locust Grove, OK, USA   USA
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1955 MG TF 1500
Properly sizing a compressor for a sandblasting job means considering both the PSI (pounds per square inch) and CFM (cubic feet per minute) of the compressor. The two factors together determine the total supply the compressor is capable of providing. The CFM on the compressor needs to be higher than that of the blaster. Choose a two-stage compressor with five horsepower or more and at least 80 gallons to ensure that the compressor runs in intervals instead of continually.

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Re: Compressors what/which one do I need
#3
ebooks76B Avatar
ebooks76B Gold Member Earl B
Queensbury, NY, USA   USA
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1972 MG MGB "Almost"
In reply to # 3408981 by Paul J Choose a two-stage compressor with five horsepower or more and at least 80 gallons to ensure that the compressor runs in intervals instead of continually.


Hello Neil,

I bought a 60-gallon, 3-horsepower, 2-stage compressor and it is not quite large enough for my blasting cabinet. Paul's suggestion seems right to me.

Good luck,

Earl


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Edited 1 time(s). Last edit at 2016-12-09 08:12 AM by ebooks76B.

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Re: Compressors what/which one do I need
#4
Tasng4 Avatar
Tasng4 Neil Goodall
Lus La Croix Haute, Rhone Alps, France   FRA
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1966 Jaguar Mark X "Olive"
1966 Sunbeam Alpine
1973 Morris 1100 "Johnny"
1975 MG MGB GT    & more
This is the one I'm thinking about --> https://www.machinemart.co.uk/p/clarke-boxer-14200-200-litre-belt-driven-air/

Earl - I realise it's nearer yours than what Paul suggests but there is a cost element as well. I expect, mostly, to be blasting smaller parts with regular pauses.

Thanks for the advice.

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Re: Compressors what/which one do I need
#5
rntanner Avatar
rntanner Roger N. Tanner (Disabled)
Oxnard, CA, USA   USA
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1970 MG MGB
1977 MG MGB
You will need to select the sand blasting equipment, and then determine which air compressor you will need, knowing what the sand blasting equipment needs.

Yes, it is the only way to clean "old car parts, down to bare metal."

When I had this equipment, we lived in a rural area, away from other homes. If you are in an urban area, your neighbors WON'T LIKE THE NOISE!


Roger N. Tanner
Professional Engineer, Retired

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Re: Compressors what/which one do I need
#6
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spikemichael Platinum Member Michael Caputo
Canton, IL, USA   USA
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1973 MG MGB "Freebie"
1973 MG MGB
1974 MG MGB "Spike"
1976 MG MGB "Cecil"    & more
In reply to # 3409320 by rntanner You will need to select the sand blasting equipment, and then determine which air compressor you will need, knowing what the sand blasting equipment needs.
If you are in an urban area, your neighbors WON'T LIKE THE NOISE!

X2000


Michael J. Caputo
'79, '77, '76, '74.5 (rubber dual SU), and '73 owner. Extensive experience in 12v Audio System design and installation. Vendor of Regalia and Promotional Products since 1993. Supplier of Accessories to MOSS. Forum Member since 2009; with a warped sense of humor since birth. Publisher of the annual MGB & GT Calendar, mailed worldwide.


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Re: Compressors what/which one do I need
#7
59mgaguy Avatar
59mgaguy John Terschak
Wakeman, OH, USA   USA
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1930 Ford Model A "Jenny"
1959 MG 14/28 "Jessie"
1974 MG MGB "Oooops"
You may want to get an upright tank to save space. plus it won't hurt to install it out side your garage in an enclosed area. That will cut down in the noise in our shop. If your going to sand blast or paint I suggest you either buy a dryer for the compressor or make one. Your going to get a lot of moisture/water mixing with your sand or paint.

John


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Re: Compressors what/which one do I need
#8
tomkatb Avatar
tomkatb Larry Baygents
Dayton, Ohio, USA   USA
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1963 MG MGB
For high usage tools it needs to be lots of electricity.

Bigger is better. I think about 14 CFM at 90psi. I have half that and it is half enough for my cabinet.

Sanders need that much.


L.W.(Larry)Baygents
63B
77 Spit

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Re: Compressors what/which one do I need
#9
mgbanthony Avatar
mgbanthony Platinum Member Anthony Henderson
Eastern Thousand Islands, ON, Canada   CAN
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1962 MG MGB
1974 MG MGB
A 5hp 2cyl, 220V and 60 gallon tank is very marginal. I've done a lot of sandblasting with it and hated every minute of it. It will maintain 90 psi, but runs constantly. An air drier is a must.

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Re: Compressors what/which one do I need
#10
Tasng4 Avatar
Tasng4 Neil Goodall
Lus La Croix Haute, Rhone Alps, France   FRA
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1966 Jaguar Mark X "Olive"
1966 Sunbeam Alpine
1973 Morris 1100 "Johnny"
1975 MG MGB GT    & more
Yes I accept that the compressor could/will struggle a bit but I have to weigh up the pros & cons of spending more for a REAL MAN'S compresssor or buying a smaller one which will be cheaper but will cope. For the last 10 years I have been using 3 X 25ltr compressors. I don't do much blasting but I'm just starting a restoration (sorry not an MG) and foresee the amount of blasting rising.

Regards,

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