[Gray Wolf]

I just ordered a couple Gast DAA-501P-GB 1/2 horse two cylinder diaphragm pumps for trials.

I think that Ricks Bong smacked the nail on the head with the observation that none of the oil less recovery pumps tolerate running dry for extended periods, so we should think outside the box and design a system that does.

I will recovery from the pots and columns using the Gast, which will run all day at -20"Hg, but won't always produce enough pressure on the discharge side to put it back in the original storage tank.

I will discharge it into a 50# storage tank, and when that tanks pressure reaches 20 psi, I will turn on the oil less refrigerant pump and pump it back down to 0/5psi, so as to always keep the oil less lubricated.

PS: Both Eden Labs and Apeks use Haskel pneumatic refrigerant pumps for hydrocarbons.

I also checked out a smaller pump that ostensibly would put smiles on our face in a larger configuration, but the company didn't make a larger one and wanted $60K for a 5 prototype run and $500K for testing and certification.

After that, if I ordered 2000 units, I could have them at $1500 each, sooooooo, as hard as it is to imagine, I declined.

It is a solenoid, with the center plunger being the piston. The switching magnetic field cycles the piston and simple check valves make a pump out of it. No doubt it still doesn't like being run dry either............

[icdog]

Those welch pumps won't work? I don't know enough to figure it out, one section said it did solvent degassing.

Is the Haskel simple to use, it looks totally different? A simple 10hp compressor is all that is needed?

[Gray Wolf]

The Haskel is two pneumatic cylinders, with a common shaft. When you cycle one back and forth with air, it moves the other piston back and forth in its cylinder, which has two check valves that turn it into a pump.

You have an air connection, and an intake for the vapors, plus one for discharge. Three point connection.

Read their clean air requirements, and plan on a refrigerative drier, an air receiver for moisture drop out, and a coalescing filter to clean up the air from the compressor.

[Gray Wolf]

Originally Posted by icdog

Those welch pumps won't work? I don't know enough to figure it out, one section said it did solvent degassing.

Is the Haskel simple to use, it looks totally different? A simple 10hp compressor is all that is needed?

The Welsh pumps might work as an interim stage, such as I'm going to use the Gast pumps for.

You need 40 scfm of clean air for maximum performance, which means a refrigerative drier, a receiver, and a coalescing filter to clean up the air.

[Breakover]

I spoke with Bacharach a while back. They told me they were pretty sure there was going to be a recovery pump built for our collective needs, with automatic vacuum/pressure trip points similar to the Caresaver, etc within the year.

Sit tight, things are changing quickly.

[icdog]

GW the Haskel sounds complicated now

[rb extractors]

I'll believe it when I see it

[Ioni Botani]

If someone was creating a proprietary design for our community (which I believe they are) they would be dumb not to turn a profit off that baby, if not to cover R&D costs alone. Whoever designs this thing could have one in every lab...

[rb extractors]

There is turning a profit and ripping people off. Until it is legal in more than a couple states, I doubt you will see it happen as the lawyers have final say over the engineers
and it is a liability and legality issue

[dybert]

Originally Posted by Gray Wolf

The Haskel is two pneumatic cylinders, with a common shaft. When you cycle one back and forth with air, it moves the other piston back and forth in its cylinder, which has two check valves that turn it into a pump.

You have an air connection, and an intake for the vapors, plus one for discharge. Three point connection.

Read their clean air requirements, and plan on a refrigerative drier, an air receiver for moisture drop out, and a coalescing filter to clean up the air from the compressor.

We will be upgrading from the Caresaver to the Haskell pump sometime in the future but like you said, there is some infrastructure required for running it.


We currently run 3 supercritical extractors, so we have the air supply dialed in just fine. But like you said, there is a lot of equipment involved in providing the "proper" air supply to these types of pumps.