Air driven circulating pump

[DesignerMike]

I'm looking for a small (1/10 HP) circulating pump, centrifugal inline if possible.
I'm looking for air driven due to the fact it needs to be XP class1 div1
Physically it needs to be TINY (about 3.5" diameter and about 5" long total)
I'm replacing a grundfos pump that was not XP.
We spoke to them and they don't offer anything XP

I think I can modify the existing pump to accept an air motor but I hate to re-invent the wheel if someone makes it.

A diaphragm pump will introduce too much pulsation and noise.
I have had no luck finding an XP electrical motor (or pump) that small...or even close for that matter.
Pressure requirement is very low, but we need significant volume.
Similar to a 67705K29 from McMaster Carr.

NO Ideas are silly!
Thanks,
Mike

 

[dcasto]

that pump is explosion proof unless you are pumping a mixture taht can ignite with an oxidizer. That pump has a sealed motor. Fractional HP motors are hard to find, but I googled and found some that are not typical. Do you need explosion proof or Class 1 Div 1? TEFC motors will comply with that code.

http://www.grainger.com/Grainger/wwg/guideBrowse.shtml

Heres another supply place that you can match a seperate motor and pump.

 

[DesignerMike]

It needs to be Class 1 Div 1

The fluid shouldn't be flamable.
The primary issue is explosive vapors in the room.

BUT you make a good point that the pump motor itself is sealed. I'm not a motor guy, so excuse my ingnorance about the terminology.
The existing one has the "armature" (with power wiring)on the outside. The inner "rotor" is actually inside the a "can" that is exposed to the liquid being pumped. Bearings I'm sure are just brass busings. I do not see any brushes that could spark without cutting it completely apart. The screw holding the shaft into the inner section is rusted and I will be drilling that out tonight when I get home to see inside.

I normally deal with much bigger pumps and motors so this is a LOT out of my field of expertise.
(without cutting it completely apart) It looks like a tiny mag-drive that uses the electricity to set up a magnetic field and the tiny rotor inside spins freely. (and produces very little torque).

You raise a good point that I will dig into a bit more.
THX!

 

[hbw]

We use air motors from Gast Manufacturing Inc., Benton Harbor, MI Tel: 269-926-6171 Website:

http://www.gastmfg.com

for small injection pumps in hazardous electric areas.

We use Model 4AM-NRV-70C which produces 0.6 HP @ 935 RPM. They have smaller sizes. You will need an air filter / regulator /lubricator upstream and a muffler on the exhaust.

 

[Artisi]

If you were using a Grundfos pump in this application and it was working and acceptable - why change it now?