Chemical Feed Pump Best Applications 4

[ohiowater]

Regarding Chemical Metering Pumps, what type of metering pump(rotary or diphragm)has the best operating history for the specific chemicals listed below (backpressure 100 psi):

NaOCl 5.0 gph
HFS Acid (fluoride) 1.0 gph
Caustic Soda 10.0 gph
Ferric Chloride 25.0 gph

 

[MechanicalJoint]

I'd check w/ a chemical feed pump company first. They will have more experience, knowledge and testing than anyone else.

I've been very happy with ProMinent pumps (headquarted in Pittsburgh, PA) with local reps in Ohio. If your in Ohio, I'd check with a their Regional Manager Craig Dunn. Their phone number is 412.787.2484. Also check out:

http://www.prominent.cc

On one NaOCL pump...make sure you have a "degassing" head on the pump.

 

[BurtP]

Check out

http://www.burtprocess.com

as well.

 

[glennpan]

Ohiowater,

There are several very good manufacturers of chemical metering pumps on the market. Diaphragm type metering pumps are the most commonly used for the chemicals and capacities that you listed. The type of pump you select should also be decided on the type of control that you require whether it be manual or an automatic style. Here are some tips for the style or material of pump that you may want to consider for your various chemicals.

NaOCl 5GPH: Use PVC as the material for the pump choice. Either a solenoid driven or a motorized pump will be fine for this size, the motorized pump will cost a little more but will provide a higher pressure. A previous poster mentioned a de-gassing head, these are fantastic for flows of 2 GPH and under where severe off-gassing can cause a pump to vapor lock. However at your flow rate this generally does not happen and is an un-necessary expense.

HFS 1GPH: Use PVDF (Kynar) as the pump material. Stay away from PP as many manufacturers will use a glass filled PP which will be chemically attacked. For this size, a solenoid driven pump is a great choice.

Caustic Soda 10 GPH: PVC pump with EPDM seals. At this size, motorized pumps are the way to go.

Ferric Chloride 25 GPH: PVC pump with Viton seals. Once again a motorized pump is a nice selection.

For more metering pump information try

http://www.panner.com

They can offer you budgetary information as well.

 

[gumlog]

My present client has standardized on Watson marlow Peristaltic tube pumps.

http://www.watson-marlow.com/watson-marlow/index.htm

I don't know that much about them but client has gotten away from diaphram pumps in recent years.

Gumlog PE

 

[glennpan]

Gumlog,

There has been a growing trend in the industry towards using peristaltic pumps. They offer less pulsation, and fewer parts in contact with the solution than diaphragm pumps.

The drawback of these pumps is generally that they are cost prohibitive. Perhaps more importantly they can be quite limited in pressures with standard pumps only going to about 30 PSI. For 100 PSI backpressure, a diaphragm type metering pump makes sense.

Glenn

 

[assco]

I use Milton Roy pumps exclusively.

 

[bimr]

It has been a tradition in the water treatment industry (at least in the US) to use diaphragm pumps. Thats not to say that other pumps will not work. You will probably find that diaphragm pd pumps are the most economical.