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| I have done quite a few searches on this question and getting a very wide range of opinions, so sorry I know this has been discussed quite a bit. We are building a fertilizer tool bar and are putting on a liquid system and I am a little confused in what pump should be used. Most people who sell fertilizer systems for a living (I.E. Agxcel, Surefire Ag) use diaphragm pumps on their systems. We were wondering why this is the case when our case IH sprayer (3330 ) and many sprayers use centrifugal pumps. We will be using a John Deere 2630 and rate controller and will be running very wide ranges of variable rates, some fields range from 15 gpa to 30+ gpa. Planning on running a 60 foot toolbar at 8+ mph. Alot of places that I read say that a centrifugal pump can't handle the change in speed like a diaphragm and that is why it is the pump of choice by many of these companies? I'm just trying to grasp the concepts here? Any help would be appreciated.
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Central Kansas | Diaphragm pumps are fixed displacement so with every revolution of the shaft a predetermined amount of liquid is pumped down the line. Diaphragm pumps change rate by changing the shaft speed into the pump.
Centrifugal pumps are used to build pressure and flow is controlled by an adjustable orifice i.e. a butterfly valve to change flow to the boom.
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haskell county, ks | just getting ready to try a hypro d70 pump with jd rate controllers but had rain so haven't ran yet. going from centrifical ace pump. frustrated with the seals failing all the time on the ace so that is our reason for the change. will be following post for others experience also. |
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Cen IL | Go with a ace hydraulic powered centrifugal and a raven 44 controller. Simplicity that is hard to beat for the money |
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Snipesville, GA | I have a diaphragm pump on our 60 ft sprayer. I can tell you that just putting out 10-12 GPA does great at 8 mph. When you get to the headland and shut off booms the pressure will spike from 35-50 psi to well over 100. That is my bad point on diaphragm pumps. They are positive displacement and what comes in must go out. They are low maintenance and durable however. We usually change diaphragms every other season.
Have you thought about a piston pump similar to a John Blue? We used those many years ago and were very accurate. |
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Coldwater, Michigan | We have used both Centrifugal and Diaphragm pumps on planters. Upkeep has a lot to do with why we have put on hundreds of Diaphragm pumps compared to a few of the Centrifugal. We usually put a by-pass on to adjust the pressure and to handle the surge of shutoff. The D70 handles the higher volumes pretty well if suited to the application. Yes, in sprayers for years the Centrifugal's have been the standard.
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Snipesville, GA | There is a fellow agtalker that has a CIH 3185 that lays by corn at 50 gpa and cotton a lot less. He's going about 5 mph at 90 ft in corn. I think he did put a bigger pump on later after OEM went out. |
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| I asked the same question last year on row starter for a planter. We installed two systems with centrifugal pumps, JD rate controllers and Raven components. We were well satisfied with the performance but judging by the comments maybe we will have seal trouble with the pumps. |
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Centrifugal Pump vs Diaphragm Pump
