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Author Topic: Gear Pumps vs. Centrifugal Pumps  (Read 11949 times)

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Offline HydroMulcher

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Gear Pumps vs. Centrifugal Pumps
« on: Thu March 26, 2015, 10:04:05 AM »
Hi

Can any one let me the pros and cons of using either a gear pumps vs. centrifugal pumps please?

Offline Turboguy

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Re: Gear Pumps vs. Centrifugal Pumps
« Reply #1 on: Thu March 26, 2015, 11:06:14 AM »
I will take a stab at it.  Bowie man would be our real expert and he is welcome to add or contradict anything I say.  Both pump types are great but they do have their pluses and minuses.

Performance

Centrifugal pumps are better for spraying distances from a tower.
Gear pumps are better for spraying through long lengths of hose.
Gear pumps can spray things like stolens and sprigs and centrifugal pumps can't
Gear pumps have suction and Centrifugal pumps don't (no big deal one way or the other)
Gear pumps can sometimes handle a little thicker slurry than a centrifugal

Maintenance

Many Centrifugal pumps are very low maintenance.  Some may require occasional greasing but many don't.  Typically a centrifugal pump can go for years with no service.

Gear pumps require a bit more service.   You really need to grease them at least once a day and preferably twice a day.  If you don't you will end up having to replace the whole pump at a point where you could usually just rebuild it.

Gear pumps will gradually lose power.  There are a stack of gaskets under the front housing.  When you lose power you remove the bolts around the housing and take out a gasket (sometimes two).  Once you run out of gaskets to take out then you rebuild the pump and start over.   

So the summary would be that gear pumps are great but do take more service.  Centrifugal pumps are also excellent and do require less service.

Gear pumps are also positive displacement pumps.  In other words as long as the pump is turning it is pumping.  You need to have a bypass open at all times when you are not spraying to allow the fluid to bypass.  So in other words if you are spraying a tall hillside with the bypass closed for max power and shut off your gun you really need to open the bypass right away.  Sometimes it is better to have two people, one who can open the bypass when needed.   Centrifugal pumps are not positive displacement and if you quit spraying with the bypass closed the fluid will just bypass in the pump.   You don't want to do that for a long time but for a few minutes it isn't a problem.
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Offline Bowie Man

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Re: Gear Pumps vs. Centrifugal Pumps
« Reply #2 on: Thu March 26, 2015, 12:33:52 PM »
Pretty much spot on Ray,  good answer!
Ed Dugan
Northeast Bowie Sales LLC
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Offline HydroMulcher

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Re: Gear Pumps vs. Centrifugal Pumps
« Reply #3 on: Thu March 26, 2015, 01:26:02 PM »
Your help answering my question is really appreciated, many thanks for your help and time. :D

Offline Turboguy

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Re: Gear Pumps vs. Centrifugal Pumps
« Reply #4 on: Thu March 26, 2015, 03:25:21 PM »
You are welcome.  I am always happy to help in any way I can.
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Offline landscaper1009

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Re: Gear Pumps vs. Centrifugal Pumps
« Reply #5 on: Fri March 27, 2015, 09:16:13 AM »
Ray -- very good answer.  The only thing I can add is that centrifugal pumps have the capacity to pass larger solids (up to 3/4") than the gear pumps I know of. 
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Offline Bowie Man

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Re: Gear Pumps vs. Centrifugal Pumps
« Reply #6 on: Fri March 27, 2015, 09:44:10 AM »
Would probably disagree with that.  Gear pumps by there construction are better at passing solids and thicker slurries.  One reason they are used for sprigging.
Ed Dugan
Northeast Bowie Sales LLC
Phone: (908) 231-0987
Fax:  (908) 333-4117
Mobile: (908) 334-6398
www.nebowiesales.com
 
Now Playing - New Bowie Video featuring our Hydro-Mulchers and Straw Blowers in action.
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Offline Jeff Clouser

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Re: Gear Pumps vs. Centrifugal Pumps
« Reply #7 on: Tue March 31, 2015, 11:06:00 AM »
It should also be mentioned that centrifugal pumps are prone to cavitation.  Cavitation occurs when air gets whipped into the slurry and passes into the pump causing it to lose prime.  This usually happens when over-mixing a highly viscous slurry of wood mulch with tack or an engineered mulch product like a bfm, fgm, etc.  In addition to the ability to pump thicker slurries, gear pumps can also pump air, thus eliminating the potential for cavitation.

In our experience, we can achieve turret spray distances comparable to centrifugal pumps on machines 1200 gallons or smaller.  We switch to centrifugal pumps on 1700 and larger machines where turret spray distance requirements are greater than what can be achieved with a gear pump.

We used to use centrifugal pumps exclusively, but made the switch to gear pumps on our C60, C75, C90, and C120 several years ago.  In our opinion, the increased capabilities of the gear pump outweigh the additional maintenance requirements. 

Thanks,
Jeff
Jeff Clouser
Sales and Marketing Manager
Amazon Steel Construction
jclouser@amazonsteelconstruction.com

 

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