Metering Pumps Tips

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Chemical Metering Pumps in a Power Plant

Have you ever wondered why power plants are located close to a water source such as a river? It is because of the need for water. Water is needed to generate steam to run the boilers and then water is needed to cool the systems after the electricity is produced from the turbines. According to estimation, the water consumption runs into thousands of gallons per Megawatt Hour of electricity produced. This water needs to be treated beforehand to get rid of organic and inorganic impurities. If the water is not treated it will start corroding the system and also reducing the efficiency due to scaling, etc. Following are some of the areas where chemical treatment of water is used in power plants.

1. Scale Inhibition, Hardness Stabilization: AquFlow Chemical Metering pumps are used for injecting phosphonates such as Phosphonobutane Tricarbonic acid.

2. Disinfection: AquFlow Chemical Metering pumps are used for injecting Sodium Hypochlorite and Paracetic Acid.

3. Flocculation: PAC (Poly Aluminum Chloride) or Ferric Chloride is injected using AquFlow pumps.

4. pH Adjustment with Acids: AquFlow Pumps are used for adding Sulfuric Acid or Hydrochloric Acid.

5. pH Adjustment with Caustic Soda: Sodium Hydroxide is added with AquFlow Chemical Metering Pumps.

6. Cleaning Agents: Formic Acid or Citric Acid.

7. Heavy Metal Precipitation: Sodium Sulfide or Hydrogen Sulfide is injected into the water using AquFlow pumps.

All these applications of chemical injection require precise amounts of dosing for the chemical. Hydraulically balanced diaphragm pumps are uniquely designed to deliver exact amounts of chemical regardless of the pressure and flow. They are very easy to adjust either manually or with a 4-20mA signal. They provide dual axis control, one with stroke length adjustment and another with RPM adjustment with a VFD. To facilitate the […]

By |April 12th, 2018|Metering Pumps Tips|0 Comments

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. […]

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 […]

Two Product Launches at the Ag Expo

Chem-Bot System

We were excited to launch our 2 new products at the Ag Expo last month.

Chem-Bot System.

Self Regulation Proportional Chemical Injection System.
– 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 raio.
– All of this without any human intervention and round the clock.
– This system is designed around simplicity and dependability.

Acid-Bot System

Acid-Bot System.

Automatic pH Balance Acid Injection System.

Acid-Bot by AquFlow is a fully automated system which measures the pH and controls it by adding chemical within the desired range. It does all this with minimal human effort once it is set up.

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

AquFlow’s year-end promotion is here: 50% OFF Spare Parts Kits and Accessories.

AquFlow is pleased to announce that until December 31st 2016 we will be offering 50% off all spare parts kits and accessories with the purchase of a pump.
Please send us your requirements here:

By |November 10th, 2016|Metering Pumps Tips, Products, Pump Accessories|0 Comments

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 […]