10 Questions You Should to Know about Diaphragm Pump

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DaveB

I know there are a few users of air powered diaphragm pumps to pump syrup (hot and cold) and I'm hoping someone can give me some direction. I have a couple of big orders coming up and I'll need to fill several drums. I have an air powered drum pump but I can't use that to fill the drums with hot syrup. I'd like to get an air powered diaphragm pump but I'm having a bit of sticker shock. I originally budgeted about $400 based on the prices I saw but after talking with someone I've learned that while the diaphragm can take temperatures up to 212 degrees, the polypropylene housing can only take temps up to 180 degrees. So now I'm thinking about $5-600.

Any suggestions on models to look for? Can I use an aluminum housing or does it need to be stainless?

My other problem is ordering time. I really need something for the week of the 23rd but most places say it will take 1-2 weeks to get my pump and that's cutting it really short. Do any places in the northeast have them in stock?

I appreciate any help!

Russell Lampron

Have you tried Amazon or ebay? I use an aluminium bodied pump with Teflon diaphragms that I got on ebay a few years ago. There are probably others that will chime in with ideas.

maple flats

I use this one zoro.com/aro-double-diaphragm-pump-air-operated-200f-pd03p-als-kaa/i/G/#specifications
It is only rated for 200F, but I heat my syrup to 205-210, then draw it into my mixing tank, add DE and then mix and I then recirculate from the the mix thru the pump and back to the mix tank until it is fully blended. Then I open the valve to the filter bank and close the recirculate valve. I run it at up to 40 PSI on the filter pressure gauge. The pump can do far higher but my press suggests 40 PSI to keep from blowing papers.
I have not tested the temp as the blended syrup reaches the pump with pressure on it but I'll bet it is down to 200 by then.
That pump will move 5-7 gal/minute on recirculate thru about 15' of 5/8 ID hose. When filtering thru a 7" 5 bank it likely moves 3-4 gpm, I never checked it.
I have used that pump for 4 years. It does very well pumping hot syrup but for moving cold syrup it gets real slow, likely about 1 gpm, my solution for that was I got a heater (barrel band type) and I put the band on anywhere from 4-15 hrs ahead. 4 hrs is OK, longer heats it enough that the pump then moves about 5-6 GPM. The heater has a t-stat, I have that set at 150F and with the band near the bottom of the standing barrel it sets up convective circulating in the barrel and the whole barrel is heated. My band heater I think is this one bascousa.com/silicone-rubber-steel-drum-heater-3-inch-wide-30-gallon.html. My barrels are 26.5 gal and to get good contact I have to tie it with wire, the spring that normally holds it leaves it too loose on a 26.5 gal bbl.

wiam

This is the one that I have. https://www.zoro.com/warren-rupp-double-diaphragm-pump-air-operated-220f-wr10kp5bkk9/i/G/ Works well. Was $400 when I got mine. I have seen aluminum ones for about the same money as now price.

cjf12

I second ebay. I found one missed labeled as aluminum but was actually stainless (could tell by the model number) great deal and most times things ship relatively quick.

DaveB

Thanks guys for the responses. I appreciate the info. After some searching this morning I think I've determined that most places online just order from the manufacturer and then ship the customer, hence the two week lead time. I think eBay is the way to go and I found a few of these:

https://www.ebay.com/itm/3-8-Kynar-Air-Double-Diaphragm-Pump-10-6-GPM-200F-ARO-PD03P-ALS-KAA/

It's a little more than I wanted to spend but it has a maximum temperature rating of 200° and I can get it next week.

I'm going to keep looking but it's tricky. I can find aluminum ones but they have a polypropylene pump or I find a polypropylene pump with a membrane that is rating for a higher temp than the pump. It's tricky!

wishlist

Not exactly sure what you mean by aluminum but poly pump Dave ? The wet end of the pump should be aluminum or stainless. Most of the poly wet ends that I&#;m familiar with are 150 or so degrees .
If your looking on eBay for one ,I would recommend a Wilden 1/2&#; . Mine is stainless and does a good job of of pumping cold barrels as well as hot syrup thru a full bank Wes Fab press .
You need to be careful not only for temp rating of diaphragms but also that they are food safe . Look up Wilden and you can get a chart with temp ratings and uses for all the different diaphragms .

I use my spare Wilden as a pump to fill the head tank .

DaveB

Not exactly sure what you mean by aluminum but poly pump Dave ? The wet end of the pump should be aluminum or stainless. Most of the poly wet ends that I&#;m familiar with are 150 or so degrees .
If your looking on eBay for one ,I would recommend a Wilden 1/2&#; . Mine is stainless and does a good job of of pumping cold barrels as well as hot syrup thru a full bank Wes Fab press .
You need to be careful not only for temp rating of diaphragms but also that they are food safe . Look up Wilden and you can get a chart with temp ratings and uses for all the different diaphragms .

I use my spare Wilden as a pump to fill the head tank .

Thanks. The 150° limit of the polypropylene is what I was talking about. I'll look for a Wilden pump.

Anyone have input on this model?

https://www.ebay.com/itm/Aluminum-Alloy-Pneumatic-Diaphragm-Pump-1-Air-Double-Diaphragm-Pump/

jimsudz

DaveB, I just purchased a aluminum 1/2" 10.5 gpm pump From MB maple in Attica NY. MB Maple is a new DSD STARS dealer. The pump was $385 and change. They had their open house last Saturday and I got an additional 10% off. I haven't received it yet but I couldn't believe the price . The ss model is around $750. Plan on putting on My filter press. Give Mandi a call @585-708-

DaveB

Goto Huakai Anti-Corrosion Equipment to know more.

DaveB, I just purchased a aluminum 1/2" 10.5 gpm pump From MB maple in Attica NY. MB Maple is a new DSD STARS dealer. The pump was $385 and change. They had their open house last Saturday and I got an additional 10% off. I haven't received it yet but I couldn't believe the price . The ss model is around $750. Plan on putting on My filter press. Give Mandi a call @585-708-

Thanks for the tip! I gave them a call and they are having one shipped from the factory. I should have it by the end of this week so the timing is perfect. I couldn't beat the $385 price and shipping timeline.

DaveB

I received my new pump and am trying to get it working optimally but so far I'm not impressed with the performance. So far I've been mostly moving cold syrup but still. For those using air powered diaphragm pumps, I have a couple of questions:

1. How big of an air compressor do you use? I have a 2.5HP pump that provides 4.7CFM at 90psi and it seems like the pump struggles. I'm not sure if it's the pump or if it's not getting enough air.

2. Do you use an air filter? Someone mentioned adding a filter or something that keeps the membranes conditioned but I wasn't sure about that.

3. Does your pump ever stop pumping? Mine seems to pump but then slow down and speed up without regard to the pressure. Sometimes it just stops pumping and air just exhausts. I'm not sure if that is normal or what.

Are there any other best practices that I should employ? I appreciate any input that folks can give me.

Thanks!

Russell Lampron

Dave, for moving cold syrup these pumps are slow. The colder the syrup the harder it is to pump for any pump. I have seen gear pumps struggle under the same circumstances. I put my bulk syrup in my RO room which is 40* or a little higher a couple of days before I plan to pump it and that makes it pump a lot easier than trying to pump syrup that is below freezing.

I use a 3hp contractors compressor and it runs almost non stop when I'm using my pump, even at 1/2 throttle when I'm using it on my filter press.

My pump came with an air filter.

Occasionally my pump will stop pumping but that's only when I trying to get that last bit of syrup through the filter press when the press is getting clogged. When I'm doing that I've got the pump throttled down so that it's not pumping very fast. On my pump I can push on the pump piston to get it moving again.

Super Sapper

I would think that your air compressor should work. It may be slower but should still work. The air should not come into contact with the diaphragm, it is used to push a rod back and forth to flex the membrane. I would filter it to make sure your actuator does not get fouled. It should not speed up and slow down unless you have a leak in the suction line. As far as air going through it and not pumping your actuator is stuck between strokes (gummed up). If it is cycling really fast but not pumping you have air in your pump and it is having a hard moving it through due to high discharge head or restricted suction. I would use some oil for air tools and run it through the air line while pumping some water to see if this clears it up.

maple flats

My air diaphragm pump does vary in speed too. I can pump cold syrup but it is vary sloooow. I use a heater like this bascousa.com/silicone-rubber-band-heater-4-inch-wide-30-gallon-drum.html
I put it on the drum in the cold sugarhouse 3-12 hrs ahead. I set it for about 100 F. If 12 hrs passes it is fully up to that temp, but at about 3 hrs it is warm enough to pump easily. I usually do the 12 hr setting, put it on the night before and when I get to the sugarhouse in the morning it is ready. I don't very often do the 3 hr time because I prefer doing the work early and waiting the 3 hrs sets me back. However I have used the 3 hr time a few times and pumped it into my finisher to heat it the rest of the way or sometimes, heat it the next morning. I only filter at 205-210 or hotter, never when colder.
I have a 1" hose and suction tube for pulling syrup to the pump. If you plan to pump cold, try a 1.25" or even a 1.5" suction, that will help delivery speed on the suction, even if the actual inlet to the air diaphragm pump is only 3/8" or 1/2". Just make sure the diameter you choose will fit in the barrel bung hole and that the suction hose is stiff enough to not collapse under a partial vacuum.

wishlist

I would think that your air compressor should work. It may be slower but should still work. The air should not come into contact with the diaphragm, it is used to push a rod back and forth to flex the membrane. I would filter it to make sure your actuator does not get fouled.

The way a AODD pump works is the compressed air is on the back side of the diaphragm. The valve spool or actuator shifts back and forth and allows compressed air to fill the chamber which &#; pushes &#; the liquid being pumped out the discharge .

A filter/ moisture trap on your compressed air supply side is a very good idea .

DaveB

Thanks for the replies guys. When you're not 100% sure about something I know I can count on getting some direction here. Lots of good suggestions.

The stuck piston diagnosis was a good one. It was just blowing air this morning and I took off the cover for the air intake and rocked the piston back and forth and it worked like a charm after that. I did notice some moisture in there so I will add a filter/moisture trap in the future.

Temps were warmer today with the rain and the syrup pumped much better. I was getting about 0.7 gals/min which is OK with me. I pumped about 120 gallons today in about 3 hours. The pump is rated at 10.5 gallons/min and I'll see what it does with hot syrup and if it comes close to that.

I have an oil heater that I have put next to a drum and placed heavy moving blankets over in the past and it warms up the drums nicely after a few hours. My only problem is that the drums are usually outside and I need to move the syrup inside so I can only do that when the weather is nice.

GeneralStark

I acquired a Yamada NDP-15 BAT (Aluminum Body) last spring and it has been working well to pump cold syrup. When shopping for one of these pumps, look for pumps with a 1/2" input/output if you really want to be able to move cold syrup fast. A moisture trap is essential and I have found a regulator to be quite handy to control the speed of the pump. I use if for pumping hot and cold syrup and sweet from the flue pan and having the ability to control the speed of the pump is very helpful. That may also help to clean up some of the start/stop pumping as well.

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Part 1: Pressure, Vacuum, and Flow

Pressure and Flow
For most sampling applications, the following information is sufficient in determining the type of pump to select:

• Required Vacuum
• Required Pressure
• Sample point conditions
• Required Flow Rate
• Temperature and Type of Gas being pumped
• Ambient temperature where pump will operate
• Distance and diameter of tubing
• Voltage, frequency, and classification of motor

Vacuum
If the required vacuum is not known, you will need to calculate the pressure drop from the sample point to the pump inlet. ADI can perform this calculation. What we need to know is the required flow rate, line distance and diameter, Gas composition and temperature and initial pressure at the sample point.

Pressure
If the sample gas is venting to atmosphere downstream, then only the vacuum needs to be calculated. If the gas is returning to a flare or back to process, then the pump will probably require pressure to get there. Again, ADI can calculate this &#; however we will need to know the pressure at the return point.

Reading the Curves

• The pump curves we provide are really (2) curves plotted onto (1) graph.
• The left side of the zero is inlet vacuum vs. flow rate with the assumption that the outlet discharges to atmospheric pressure (or close to it).
• The right side of the zero is outlet pressure versus flow rate with the assumption that the inlet pulls from atmospheric pressure (or close to it).
• In applications where the pump is pulling a vacuum and providing discharge pressure; we have another set of curves called &#;combination curves&#;.
• Please contact ADI in these cases.

Vacuum Example

• If the inlet pressure drop is calculated as 5 InHgG at 8 SLPM and the sample vents to atmosphere, then all we need to do is find a pump that will provide &#; 8 LPM at this vacuum. See below.