Centrifugal pump selection for dissolved gases on stream
Centrifugal pump selection for dissolved gases on stream
(OP)
I would like to know about centrifugal pumps models and its suppliers address who are able to handle flows with up 70% vol gases, without cavitation.
Thanks.
Thanks.





RE: Centrifugal pump selection for dissolved gases on stream
Unless you run the pump at very, very low speeds (in which case you will get hardly nothing out of the pump), you will caviatate just about any centrifugal pump because of the offgassing that will occur at the impeller eye. In addition, you will vapor bind the pump even if you are lucky enough to run without cavitation.
My advice is to reduce the concentration of dissolved gasses to less than about 5% and then you can start looking at centrifugals.
Regards,
Tim S.
RE: Centrifugal pump selection for dissolved gases on stream
Thanks
Orama/Brasil (aombr@yahoo.com)
RE: Centrifugal pump selection for dissolved gases on stream
For low flows consider a diaphram pump.
For higher flows you might consider a pressure pump.
Several options more information about the system and I think you are right the problem has known solutions.
Regards,
Dan Price
RE: Centrifugal pump selection for dissolved gases on stream
You might consider looking to the oil production industry for a suitable pump. There are several types of positive displacement pumps that are capable of reliably handling multi-phase fluids which include oil, gas and solids. One of these manufacturers is Moyno Pumps. Their website, www.moyno.com, includes information on their product. Click on the "Products" button on the right and then look for the "Tri-Phaze" pump icon to get to the information. Progressing cavity pumps will pump large volumes of gas with liquids. In fact, the originator of the concept was trying to develop a compressor.
Good Luck!
RE: Centrifugal pump selection for dissolved gases on stream
TM
RE: Centrifugal pump selection for dissolved gases on stream
As I understood the original question, it involved a multi-phase fluid which contained a very high volume (70%) of gas. How would you pressurize the suction of the pump sufficiently to dissolve all of the gas into the liquid? It is this gas that creates the problem for any centrifugal pump because of their basic operating principal. That is, the fluid enters the eye (center) of the impeller and is accelerated outward via centrifugal force along the impeller vanes. Since the liquid phase is generally more dense than the gas phase, the centrifuge effect separates the two and "concentrates" the gas at the center of the impeller. Eventually the volume of gas at the center is large enough to vapor lock the pump and fluid no longer enters the suction. You can fiddle with this by removing the gas or improving the pump's ability to pass it (pardon the pun), but these efforts can only go so far.
Positive displacement pumps, on the other hand, are capable of and are routinely used to handle multi-phase fluids without damage or loss of performance.
RE: Centrifugal pump selection for dissolved gases on stream
These are centrifugal, relatively low head, machines suitable for 'pumping' wet gases.
There are plenty of manufactures who offer this type of machine. Search on google.com for 'liquid ring vaccum pumps'
RE: Centrifugal pump selection for dissolved gases on stream
If the vented gas can be put back in the process and pressure balance the operation great, other wise try use it elsewhere in the process. If it has to be discherged to atmosphere clean it up to best environmental requirements first.
The things I give away for free!!!!!!!!!!
Regards,
Mike S
RE: Centrifugal pump selection for dissolved gases on stream
I think they only have a slug catcher and a suction scrubber where the Gas Liquid Ratio is tunned.