Case Studies

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AquFlow Pumps in Cooling Tower Applications

Cooling towers are very common in industrial complexes and commercial buildings. The one thing common is that they use a lot of water. Water conservation requires that water to be recirculated. And that recirculated water needs to be treated to ensure that it does not corrode or scale the cooling elements. Additionally there are possibilities of organic growth within the water which requires treatment with biocides.

Corrosion Inhibitors – These are injected in the recirculated water to prevent corrosive damage to the components.
Scale Inhibitors – Scaling can be more damaging than corrosion sometimes as it drastically reduces the heat transfer. Anti-scalants are injected to prevent scaling in the pipes and tubes.
Biocides – There are two options here Non-Oxidizing Biocides and Oxidizing Biocides. The Non-Oxidizing biocides are dosed once or twice a week and they typically require and contact time of 4 hours. Oxidizing Biocides such as Chlorine and Bromine are used depending upon the pH of the water. Bromine is effective for pH up to 9 and Chlorine is good for lower pH around 6 or 7. Their level are usually measured using Redox (Oxidation Reduction Potential – ORP).

Fireproofing Injection Pump

Injecting Alum / Accelerator into the fireproofing materials is the key to effective coverage that stays in place on structures for a very long time. AquFlow pumps are widely used for their dependability for Alum injection applications in many fireproofing systems. The ability to easily operate and adjust the flow of the pump while it is running along with the reliability of AquFlow pumps which last for years with almost no maintenance makes AquFlow a preferred pump. AquFlow also has Duplex pumps which can pump material in two parallel lines to feed two sprayers simultaneously. So whether you are spraying on cementitious material like CAFCO 300 or fire resistive plaster like Monokote you will be in control and confident with AquFlow injection pumps.

Pumping Viscous Liquids with AquFlow Pumps

Not all liquid chemicals are the same. Liquid chemicals come in various shapes, consistencies, viscosities and solid content. In this article we are going to explore the most suitable options for pumping high viscosity liquids.

Viscosity is by itself a complex subject which requires a very detailed explanations to various kinds and measures of viscosity. For our purposes we will keep the discussion relatively simple. Viscosity of a liquid is the resistance it generates to flow. When a liquid flows it has various frictional resistances that act on it and within itself. Two major types of viscosities are the dynamic (shear) viscosity AKA absolute defined as the friction between adjacent layers of the liquid as it flows and the second one being the kinematic viscosity which is measured as the ratio of absolute viscosity to its density.

Hence the higher the viscosity is of a liquid the slower it flows or pours out of a container. If we were to take two jars of exactly the same size and shape and fill one with water and the other with honey. Then we try to pour the contents out by turning it at a 45 degree gradient downwards, we will notice that the water jar empties out in a fraction of the tie it takes for the honey to empty if it ever empties completely. This is an illustration of what viscosity does to the movement of a liquid which is the rate of flow. So now we have established that the higher viscosity liquids flow slowly.

AquFlow makes several modifications to its pumps depending upon the liquid and the application to make it ideal for these high viscosity liquids. Some of these are as follows,

1. We reduce the speed of the flow by reducing the strokes per minute. […]

Did you know Hydroflo is AquFlow?

Many of you may already know this, but we started our life as Hydroflo in 1972.

Hydroflo pumps were revolutionary in design and quickly built their reputation as one of the most durable pumps. Soon the teal colored pumps were all over known for their quality and reliability. Then after the original founder Mr. John Klembeth retired in 1996, the company changed hands a couple of times under two different managements. That is where the names Penn Process Technologies and Nikkiso come in.
In 2007, AquFlow re-launched the pump line with a new name and a fresh new look with Golden Yellow color. So whether you have a teal green pump, a yellow pump, a Hydroflo pump, a Penn Process pump, or a Nikkiso pump, you need to contact AquFlow for all the spares, accessories and replacement pumps.

By |June 5th, 2017|Case Studies, News, Products|0 Comments

Metering Pump Market Global Forecasts to 2020

The Metering Pump Market size is projected to grow at a CAGR of 6.3% to reach USD 4.6 Billion by 2020 according to a recent article posted by MarketsandMarkets.

Among these six applications of the metering pump market, water treatment accounted for the largest market share in 2014 in terms of number of units sold as well as value. Metering pumps have region specific demands that are differentiated by placement, cost, and efficiency. With the flourishing water treatment, pharmaceutical & petrochemicals, and oil & gas industries in the Asia-Pacific region, it is expected to register a high CAGR of over 7% between 2015 and 2020.

The metering pump market size is projected to grow at a CAGR of 6.3% to reach USD 4.96 Billion by 2020. In terms of value, the metering pump market size in water treatment application is projected to reach USD 1.75 billion by 2020, at a CAGR of 5.9% between 2015 and 2020. The growth is attributed to the increasing demand for environmentally friendly wastewater disposal and increasing investment in modernization of infrastructure. Diaphragm type metering pumps offer significant advantages over other type of metering pumps and hence, lead the market whereas plunger/piston type metering pumps, due to their maintenance issues and inability to handle abrasive fluids, are projected to register a relatively lower CAGR.

Asia-Pacific was the prime market for metering pumps in 2014 and is projected to register the highest CAGR between 2015 and 2020, backed by the increasing demand for metering pumps in China. The overall growth of the Asia-Pacific region will be supported by the high growth of the metering pump market in China and India, which are projected to register CAGR between 7%-8% during the forecast period. China is […]

Controlling the Flow Capacity of a Metering Pump

Since a metering pump is usually a positive displacement pump there are two possible ways of controlling the flow capacity. The first one is by adjusting the volume of liquid displaced per stroke of the pump and the second is by adjusting the speed of the strokes.
I. Stroke Length – control the displacement volume per stroke
II. Speed of Strokes per minute

1. Stroke Length – Manual: All AquFlow hydraulic diaphragm metering pumps come with a standard manual knob to adjust the volume from 100% down to 5% or 10% without compromising the accuracy. On AquFlow pumps you can adjust the manual knob even while the pump is running unlike some other pumps where you have to turn the pump off before adjustment.
2. Stroke Length – Automatic ECCA: The stroke length can also be controlled automatically with an electronic signal (usually 4-20mA) coming from a source such as SCADA, PLC or a computer.
3. Stroke Speed / Frequency – VFD: We can adjust the speed of the pump by connecting a VFD to run the motor. Here again you can achieve very low flows by reducing the speed of the pump.
4. Dual Axis Control – Stroke Length And Stroke Speed Combined: Here we get the ultimate in control to the finest resolution by combining both the Stroke Length as well as the Stroke Speed. This can e done with a manual adjuster or automatic with electronic signal.

Introducing: Chem-Bot by AquFlow

Chem-Bot System

Self Regulating Proportional Chemical Injection System.
Water quality and its consistency is critical in many industries and applications. Very often the water is chemically treated to improve its quality for a given application. This treatment depends upon maintaining an exact proportion between the volume of the water being treated and the volume of chemical being used for the treatment. Variations in the volume of water with constant chemical flow such as in an irrigation pipeline where fertilizer is being added could show up as patches of green and brown.

▪ Chem-Bot is the solution to automatically and intelligently change the volume of the chemical in proportion to the flow in the pipe
▪ .It works by monitoring the flow in the irrigation water line sending a signal into the controller when flow changes
▪ The controller then sends a corresponding signal to the VFD
▪ VFD increases or decreases the chemical flow to keep desired ratio
▪ All of this without any human intervention and round the clock
▪ This system is designed around simplicity and dependability

Skid Systems (#8 of 8)

A Chemical Metering Pump is seldom used by itself. It is usually a part (ok, the part) of a chemical injection system into a process. Such a system requires various accessories, valves and controls to dispense the exact amount of chemical demanded by the application which may itself vary. Let us say if you are using chemical pump to achieve pH balance for the water. You need to measure the pH of the treated water and based on it decide if you need more acid to be injected. Such controls require you not only to monitor, measure and control but also to adjust dynamically as the conditions change. You need to have the flow meters, PLCs and valves all communicate with each other and deliver the desired result which in this case may be a pH value of 7 for the treated water. This is just one of the many applications including fertilizer dispensing, disinfectant chemicals for water, anti-scalant for pipes or boilers, anti-corrosion chemicals for oil extraction etc. etc.

Skid System

The end-user either has to figure out all the various components he / she needs, then make sure they all are compatible and communicate with each other and start buying each one perhaps from different sources. Then put this together in a way that is most efficient and make it work. If something goes wrong then deal with various suppliers who usually are quick to blame someone else’s component for the problem. It just becomes a complex headache. Many end users have figured out that it is far better to buy the complete systems from one manufacturer. Usually the pump is the most complex and central part of the system and AquFlow has tried and […]

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