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Sizing & Selecting the Right Chemical Metering Pump

In 2016 we will start a series of articles which address the very important issue of how to size, select, install and use a metering pump properly. As we all know, chemical metering pump applications are sometimes very complex and require planning and preparation from early on to ensure a successful installation. This series of articles are divided into the following eight sections:

1. Planning: Before we even start with sizing the pump, it is important to plan the application. We take into consideration various things such as the chemical, its physical and chemical properties, storage tank and its location, day use tank and its location relative to the pump and more especially its suction port, the injection quill and its distance from the pump, electrical power requirement etc.

2. Sizing: Here we start with the flow requirements and how much back pressure we encounter in the injection process. We also take into consideration the physical properties such as viscosity and density, and compensate for it. Dosage variation demands are also very important considerations.

3. Selecting the right pump: This is where you understand the different choices you have in types and brands of pumps and how to differentiate between them. We will also discuss life cycle cost versus purchase price of a pump.

4. Selecting the right material: Most chemicals are corrosive in nature and they require selection of material that is resistant to chemical attack. Knowing the exact chemical, its temperature and concentration is critical in selecting the right material.

5. Configuration: Do you want a leak detection system? Is the environment filled with flammable gasses or liquids in which case? What type of connections do you need for suction and discharge piping? These are the questions which will be addressed in this […]

By |March 18th, 2016|Metering Pumps Tips, News, Selecting the Right Pump|0 Comments

Leak Detection Systems for Hydraulic Diaphragm Metering Pumps

Aquflow hydraulically-actuated diaphragm metering pumps are by design both rugged and leakproof. However, in some difficult and/or critical chemical feeding applications, it is often desirable to add diaphragm leak detection – whether to protect the pump from hostile chemicals or to protect the process from possible contamination by hydraulic fluid.

For these applications, AquFlow has developed two highly reliable diaphragm leak detection systems. Your NPA sales representative can help you determine which system is best suited for your particular needs.

Series 3000 Pump w/ PVDF Liquid End and Conductivity Probe

Conductivity-Type Leak Detection

The conductivity-type leak detection system can be furnished on either tubular/disc diaphragm or double disc type diaphragm liquid ends. The system consists of a conductivity probe mounted in the pump intermediate chamber between the diaphragms. This intermediate chamber is filled with process compatible non-conductive fluid.

In the event of a diaphragm failure, process fluid leaking into the intermediate chamber results in a change of conductivity. This change in conductivity of the intermediate fluid increases probe current through the sensing circuit of the solid state control module. When the probe current exceeds the setpoint current, the control module energizes a relay output.

Series 1000 w/ Vacuum-Leak Detection

Vacuum-Type Leak Detection

The vacuum-type leak detection system is a highly reliable means of sensing diaphragm failure, and is frequently used when the process fluid will not allow a conductivity-type system. The vacuum-type system consists of two PTFE diaphragms held together under vacuum and separated by a thin, metallic intermediate ring. In this system, diaphragm failure is detected by sensing a change in vacuum pressure between the two diaphragms.

The complete leak detection system includes a vacuum gauge, tubing, purge valve, vacuum accumulator, and a factory preset vacuum switch. The U.L. listed SPDT vacuum switch […]

By |May 28th, 2015|Products, Uncategorized|0 Comments

Helpful Videos Available On Our Site!

Working Principle

Preparing for Installation

AquFlow has recently made a serious effort to make and publish instructional videos on our website. These videos can be watched on any platform including, PC, Tablets and Smart phones ( Apple, Android, etc.).

Following are some of the topics on which you can watch the videos today:

Bleeding Air from the Hydraulic Side

Replacing the Check Valve Seat

▪ How to start and operate and AquFlow pump
▪ How an AquFlow pump is assembled
▪ The working principle of a hydraulic diaphragm metering pump
▪ Proper maintenance of an AquFlow pump, including check valve seat replacement and purging trapped air
▪ And many more…

Click here to view our videos!

By |April 29th, 2015|Metering Pumps Tips, Products, Pump Accessories, Safety, Videos|0 Comments

A Simple Solution for Degassing Problems

AquFlow Series 1000

Some chemicals are susceptible to giving off gas while being moved or pumped. This challenge is especially complicated when this gas could get trapped in a small volume pump. Then the pump would not move any liquid as the gas trapped in the pump chamber would expand and contract with each stroke without moving any liquid. Fortunately, this is an issue AquFlow can easily overcome.

We have a special degassing diaphragm head which senses and expels the gas through a valve at the top where the gas usually tends to rise. This special design of the degassing head is very popular among municipal water and wastewater treatment facilities that use 12% sodium hypochlorite. With our assistance in proper pipe layout and a degassing head the possibility of degassing is minimized.

Parts schematic of a degassing diaphragm head and suction lift

AquFlow over the last 42 years have come up with many such specialized industry solutions such as IVAX (Intelligent Verification and Control System), tubular pump for viscous liquids, etc. Please visit our website to learn about various configurations and newest product developments at

By |April 27th, 2015|Metering Pumps Tips, News, Products, Pump Accessories|0 Comments

Skid-Mounted Systems Built Specifically for You

AquFlow offers customized ChemInjector systems based on your specified applications. We provide everything you need for an accurate chemical injector system. Most assemblies are skid-mounted, which is then placed at the site. Some chemical injector systems are too large for skid mounting. For very large systems, AquFlow provides on-site assembly as well as the option for mobile chemical injector stations.

* Systems are customized for you based on your chemical dispensing requirements.
* A complete turnkey system that can perform dependably and durably with minimal down time.
* Every component that goes into the system is pre-matched and tested so there are no incompatibility issues.
* On-site assembly available for systems that are too big for skid mounting.
* Mobile systems mounted on carts / trailers or other vehicles for covering long distances.

For more information on our standard ChemInjector packages and other available skid systems, contact our sales team at

By |March 26th, 2015|Case Studies, Metering Pumps Tips, News, Products, Pump Accessories|0 Comments

Four Differentiating Facts – Solenoid Vs Hydraulic Diaphragm Metering Pumps

Hydraulic Diaphragm Series 900

Solenoid Series 200

1. Cost of Ownership: While it is true that solenoid pumps are often less than half the purchase price of hydraulic diaphragm metering pumps, the total cost of ownership tells a completely different story. Hydraulic diaphragm metering pumps last over 10-15 years in the field with almost no maintenance. Solenoid pumps usually need service and replacement diaphragms every 6-9 months depending upon usage. Typically, a solenoid pump is considered good if it lasts 2-3 years in the field.

2. Balanced Diaphragm Vs Imbalanced Diaphragm: Hydraulic diaphragm pumps have process liquid on one side and hydraulic liquid on the other side to achieve balanced pressure on the diaphragm. This results in the diaphragm experiencing almost no mechanical stress which ensures a long life. On a solenoid metering pump, you have all the process pressure on one side with nothing to balance against it on the other side. This puts a lot of mechanical stress on the diaphragm and eventually causes bulging and failure.

3. Accuracy Matters: Due to the very nature of its design, hydraulic diaphragm pumps are extremely accurate throughout its life. That is the reason they are the only pumps that can meet API-675 standards. Solenoid pumps cannot because the diaphragm could bulge out or balloon even before it fails, which causes the accuracy to drop significantly.

4. High Performance: Solenoid pumps are good for low flow and low pressure applications usually under 100 psi. The duty cycle also needs to be very light. On the other hand, hydraulic diaphragm pumps can achieve flows and pressures hundreds of times higher than solenoid pumps. Hydraulic diaphragm pumps are also made for heavy duty or continuous operations 24/7.

So while solenoid pumps have their place […]

By |March 10th, 2015|Case Studies, Metering Pumps Tips, News, Products, Pump Accessories|0 Comments

Introducing the Remote Pump Head

Occasionally we have to pump some liquids with extreme temperatures that are either too hot or too cold. In either case, these temperatures could potentially cause long term wear and possible damage to the internals of the gear housing and the hydraulic oil it contains. AquFlow’s Remote Pump Head is designed to keep that temperature related effect away from the rest of the pump components by separating the liquid pump chamber away. We use the appropriate intermediate oil to better handle the temperatures and help dissipate the temperature difference.

Essentially the working principle of this pump is similar to any other AquFlow hydraulic diaphragm metering pump. The only difference is that there is an intermediate hydraulic oil that transfers the pressure to a pump head that is some distance away from the rest of the pump. These pumps are highly engineered pumps and they need to be customized to each application specifically. Hence we would need to know all details of the application such as exact process liquid, temperature of the liquid, viscosity and specific gravity of the liquid, ambient temperature, duty cycle (how much time the pump is running before it is off), suction and discharge conditions etc. before we can determine the exact configuration most suited to the application.

For full features and specifications, download the brochure HERE.

By |February 24th, 2015|News, Products|0 Comments

Top 5 Causes for AODD Pump Failure

1.       Air Valve Stalling, Clogging or Leaking: Stalling of the air valve often has to do with the design of the airways inside the valve. If the design in less than optimal it will stall under certain conditions. Same can be said about leakage of air where the air mostly blows through the valve instead of being redirected to push the diaphragm. Clogging on the other hand could be due to the quality of the air you are using. Make sure you use filtered air to run the pump.

2.      Diaphragm Rupture: The diaphragm in an AODD pump is always subject to mechanical stress and over time it causes stress cracks and failure. Material of the diaphragm combined with the method of manufacturing plays an important role in the longevity of diaphragms. Another important factor is the pressure. The higher the pressure the higher is the stress on the diaphragm. Lastly the number of strokes is the ultimate measure for the life of the diaphragm. Pumps that run faster will likely fail more quickly.

3.      Check Valve Failure: Usually AODD pumps use ball style check valves. These check valves are likely to fail due to something getting in between the ball and the seat preventing a good firm leak-proof closing of the valve. Use of a strainer will reduce this possibility. Additionally flushing the pump when you suspect something is stuck often clears the check valves of debris. Wear of the ball and seat also causes leak paths. This wear could be due to abrasive particles in the liquid or just a matter of poor material choice for balls or seats.

4.      Muffler Icing or Clogging: The main reason for the muffler icing is the […]

By |February 12th, 2015|Uncategorized|0 Comments

Visit AquFlow at Booth 2031 in Pavilion B!

AquFlow will be at the World Ag Expo

In addition to being strong in Water, Wastewater, Oil & Gas and other industrial markets, AquFlow pumps are very popular in the agriculture market for fertigation and chemigation applications. The accuracy and reliability of these pumps mean the farmers can count on these pumps starting right up season after season. These pumps do not need any special off-season storage procedure. They are ready to go whenever needed. AquFlow also has developed special Unidirectional pumps that do not reverse upon polarity change in center pivot applications. Please visit us at the show and ask us about our show specials on our most popular models.

By |January 26th, 2015|Events|0 Comments

AquFlow Wishes you Happy Holidays!

By |December 23rd, 2014|Uncategorized|0 Comments