Building / compressor help needed

[hammered]

Hey Guys Hoping you can give some input on our compressor experiments down here in Costa.

Built a unit using a Bitzer refer pump.
Near silent and has great cfm. at about 850 rpm with a 2hp 220 motor.
6 minutes to fill 200 liters.

I closed the oiler hole off with a plate but we were still getting oil in the air.
These pistons have only 2 pressure rings no oil ring.
I am wondering if I machine oil rings into the piston will this solve the oil issue?

I am hoping it will as they are great pump heads and the low db is nice.
Idea is to run 2 on the same tank and up our cfm for sand blasting.

I am guessing this will fix it but need to ask before I waist time and $ to find out it is not the problem and refer pumps are NFG. for air compressors.

any info and input would be great.

We have one of those 110lb preasure tanks for blasting and need as much cfm as we can get.

Next ?

Right now the refer pumps are on moth balls till I get word on the oil issue.

I bought a big ass 2 phase pump off a neighbor.
We have it plumbed with 3/8 tube. Pump to tank.
The head exhaust manifold can take up to 1'' pipe.
If we open up the tubing will it make that much of a differance?
I know water and oil ya but compressed air?
As is this unit pumps up 200 liters in about 4 minutes.
I want to up this if I can.
Still short on cfm.
We are running 3/8 airlines and thinking if you say open it up then I should go 1/2 air lines.

We run 4 100 tanks linked for drying the air.
90% humidity here.
1st is wet, second better 3rd and 4th near nothing and then we have a series of filters along the line.

Great trick we found out by mistake for any of you needing dry air on the cheap.
Just have a secondary holding tank or tanks at the end of the line.
The air is much drier in the end seems to condense in the 1st and 2nd is much dryer.

We run these machines 5hrs a day and the last tanks haven't got much more than a rats piss in them when we are done the day and drain them.

The 1st pours water when we drain it. up to a quart +.

Anyhow hope one of you can answer these ?s on oil and opening up the air.

Pura Bira

 

[Dirtsquirt]

Greetings from up north

Refrigeration compressors are meant to pump oil they usually have no oil control rings/
They are used in a closed system which means the oil that is pumped out will get returned.
They can be used for air with some work and some cost.
When used or air compressors you have to watch the oil level as they pump it out.
The only way i can think of to get a satifactory result would be
To install an accumulator. vessel on the discharge of the size would depend on cfm. I dont do liters or any of the foreign measuring systems so I am not gonna offer any advice here.
But 2 hp at 100psi should only deliver around 6cfm a minute.
that being said. A quart jar that is baffled. Ie: full of loosely rolled up wire mesh.. or dividers that cause change in directional flow. The idea is to slow the speed of the air down so the oil can drop out via impingment.
A drain on the bottom that weeps the oil back into the crankcase is viable idea and will keep your oil usage down.
the last phase to get decent air from a set up like this would be to
install coalescing filter (oil removal) after the first big tank. and take your air down stream of there.

is there a tag on the pump you bought from the neighbor
a 1 discharge would indicate to me that the pump is likely somewhere in 7.5-15 hp range if indeed it is an Air compressor.
ON the face of a 3/8 copper discharge would a terrible thing.
1/3 hp is the smallest i would use a tube that size on.
1/2" tube thur 3hp and 3/4 tube thru 7.5hp
if the pump is as large as i am guessing. you have like 200 psi at the discharge valves of the compressor and 100 where it hits the tank. All in all a bad deal..
Good luck.

 

[hammered]

I tubed it up on the exhaust to 5/8s now.

Charges 55 gallons in 3 minutes flat.

1100 rpm 120 lb shut off.

Any idea what kind of CFM I am getting.

I checked on some convertion gidits and can't make s*** of them.
2.5 cfm and I am guessing it is much more than this.

beats the neighbors compressor hands down and he is rated at 12 cfm.

If anyone knows how to rate a compressor let me know please.

Would be interested in figuring out my consumption and what I am powering out with this head.