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Determining the Pump Controls (#6 of 8)

This is the sixth of eight articles in the series Sizing & Selecting the Right Chemical Metering Pump.

Before we discuss the topic of controls, it is important to understand that a metering pump takes external signals to turn on or off, as well as increase or decrease the flow capacity to meet the demand precisely. The signal to do these controls can come from a variety of external sources such as flow meters, sensors and / or PLC controllers.

The flow capacity of a metering pump is controlled by two different methods. One is to regulate the speed of the pump stroke which is accomplished with a Variable Speed Drive. The second method is to regulate the effective stroke length of the pump plunger. This stroke length adjustment could either be done manually or by an automatic stroke adjuster such as ECCA. In sensitive applications where there is a risk in using electrical signals and adjusters, these pumps can be controlled by a Pneumatic Stroke Adjuster. Some times in critical applications the engineers suggest using them both which is effectively Dual Axis Controls. That way you can maximize your adjustability and fine tuning.

As you may know by now, a metering pump seldom works in isolation. It works as a part of a system. The metering pump often needs to be turned on when there a need for a chemical to be injected and turned off when that need is fulfilled. It also needs to regulate the flow based on the demand. So in addition to the On / Off controls, the pump needs input to increase or decrease the flow capacity.

Frequently that is accomplished with a 4-20mA input where 4 is off, 20 mA is 100% capacity […]

By |July 22nd, 2016|Metering Pumps Tips, News, Selecting the Right Pump|0 Comments

Determining the Pump Configuration (#5 of 8)

This is the fifth of eight articles in the series Sizing & Selecting the Right Chemical Metering Pump.

This is where we take into consideration, the specific details of the application and everything that surrounds the pump. First, we should consider what kind of piping the pump needs to be connected to. What is the material, and what is the size? Does it need threaded connections (if so, male or female), or does it need flange type connections?

When the consistency and viscosity of the liquid get too thick then it could clog up in the valves and diaphragm head. For such liquids, it is important to use a tubular diaphragm where the liquid paths are more open, and it is easy to pass viscous and slurry type liquids.

On the other hand, if the temperature of the liquid being pumped is too high, it could negatively impact the hydraulic oil driving the pump and other components in the pump. For this we should consider using a remote diaphragm pump head,with which becomes a lot easier not only to keep the heat away from the rest of the pump, but also to remove heat with a cooling jacket around the remote head.

Then we should consider the application and whether a leak detection system is important. Many times in potable water or other food applications, customers prefer an early warning leak detection system so they can fix it before the oil in the pump contaminates the process lines.

There are two types of leak detection systems to consider. If the liquid being pumped is conductive then a conductive leak detection system is less expensive and effective. However, if that does not work there is a vacuum leak detection system option […]

By |June 24th, 2016|Metering Pumps Tips, News, Products, Selecting the Right Pump|0 Comments

Selecting the Right Material (#4 of 8)

This is the fourth of eight articles in the series Sizing & Selecting the Right Chemical Metering Pump.

Every liquid, including water, has some corrosive interaction with pump wetted components, the degree of which depends upon the material that is coming in contact with the chemical. In our world of injecting chemicals, we come across some of the most aggressive chemicals such as Sodium Hypochlorite, Sulfuric Acid, Sodium Hydroxide etc. If careful consideration to selecting the right material is not given, the resulting failure could be expensive at best ad catastrophic and injurious at worst. There have been cases where a chemical eats through the inside of a pump housing without being noticed until it develops pin holes or explodes due to pressure, causing injuries to personnel around. Hence it is always advisable to double check the material being selected to ensure that it is corrosion resistant. The good news is is that there are corrosion resistant materials available with most manufacturers for use with such chemicals.

The first step is to know the chemical and its properties.

1. Exact composition of the chemical: Knowing that it is an acid is not enough. You need to know what acid it is and what other chemicals are in that solution.
2. Concentration: A 10% concentration of a certain chemical behaves entirely differently as compared to a 40% concentration. A material of construction which is resistant to 10% solution of something may get destroyed by 40% concentration of the same chemical.
3. Temperature: Just as the concentration these chemicals behave differently with increased temperature.

In addition to the above which pertains only to the chemical coming in contact with the internal surface of the pump, one must take into consideration events such as spillage […]

By |June 6th, 2016|Metering Pumps Tips, News, Safety, Selecting the Right Pump|0 Comments

Food Grade Oil Available!

Chemical metering pumps are popular in the food processing industry. They may be used in a wide variety of food processing including mixing ingredients, adding flavoring and preservatives, metering vitamins, and water conditioning. In these applications, incidental food contact may occur, and food grade lubricant oils are best recommended for the pumps.

Aquflow is proud to announce that we offer food grade oil with our metering pumps! Our waterproof and fully synthetic lube oils are biodegradable and do not emulsify with water. Their extreme pressure and low foaming properties make excellent lubricants for hydraulic systems in not only food processing, but also in water and wastewater treatment.

Please contact an AquFlow representative for more detailed information on our available grades.

By |May 17th, 2016|Metering Pumps Tips, News, Products|0 Comments

Global Metering Pump market size to reach USD 4.96 Billion by 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 pumps 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, with its developing economies and rapidly expanding manufacturing bases, is expected to witness the highest growth market in terms of value during the forecast period.

By |May 11th, 2016|News|0 Comments

Selecting the right pump (#3 of 8)

This is the second of eight articles in the series Sizing & Selecting the Right Chemical Metering Pump. Read the previous article “Sizing your chemical metering pump and determining injection rate.”

Unlike most other decisions, this is the most subjective decision to make (unless you have tried various types and brands of pumps). This is also the most consequential decision in determining the level of success with your pump applications. There are many pump types and pump brands available in the market today. Each type and brand of pump has its unique positives and negatives. It is up to the user to choose the right type and brand for their unique application.

It is important to first know that all pump types are divided into two broad types: (1) Centrifugal and (2) Positive Displacement. While centrifugal pumps are the most common types of transfer pumps, they are not suitable in applications where the flow needs to be accurate and needs to overcome high pressures. In the context of chemical metering / dosing applications, a positive displacement pump is used almost all the time. Within the positive displacement pumps, there are many types. Below, we are going to discuss only the most common types used for chemical metering / dosing applications.

1. Gear Pump: As the name suggests, these pumps function by trapping liquid between gear teeth and pushing it from the suction to the discharge port. These are often used for hydraulic pressure developing. However, gear pumps are not suitable for accurate metering applications due to the leak back of liquid depending upon the clearances. These clearances will also tend to increase with wear.

2. Air Operated Diaphragm Pumps:This is a very versatile kind of pump and perhaps the most […]

AquFlow successfully completes large overseas project

Have you gotten the chance to see our 14 metering pumps designed for a large scale overseas project?

AquFlow was awarded a large chemical injection project for Kuwait National Petroleum Company in late 2015 which included several Series 3000 and Series 4000 pumps. These pumps were made to API 675 standards and included several options such as vacuum leak detection system, ECCA automatic stroke controller and special IEC motor adapters.

With this project we have further expanded our reach in Middle East and Asian market as the contracting company was Korean. AquFlow pumps were applied in a variety of applications including Neutralization Caustic injection, Polishing Sulfuric Acid injection and Demineralizing Sulfuric Acid.

By |April 25th, 2016|News, Products|0 Comments

Controlling Pump Capacity with ECCA

The pump capacity of hydraulic diaphragm metering pumps can be controlled both manually and automatically. Automatic adjustment can be handled by an Electronic Capacity Control (ECCA). This replaces the standard manual micrometer knob and can be mounted directly onto the pump. AquFlow’s ECCA uses miniaturized, state-of-the-art electronic technology built around an AC synchronous motor, which permits precise actuator travel, without hunting or overshoot.

The actuator may be housed in a NEMA 4X enclosure or NEMA 7 enclosure. Regardless of choice of enclosure, the ECCA is designed with convenient installation and maintenance in mind. Color-coded wiring leads simplify field installation and are fully encapsulated to keep moisture out. Encapsulated wiring leads also eliminate the need to open actuator housing to accomplish field wiring.

For more details and specs, visit our page or contact an AquFlow representative.

By |April 18th, 2016|News, Products, Pump Accessories|0 Comments

Sizing your chemical metering pump and determining injection rate (#2 of 8)

This is the second of eight articles in the series Sizing & Selecting the Right Chemical Metering Pump. Read the previous article “Planning for your Application.”

A metering pump is used to inject chemicals precisely into a process to achieve a certain desired result. That result could range from a certain amount by volume or mass of fertilizer to a definite amount of acid into water to achieve a certain pH balance. Or it could even be a certain amount of disinfectant into water to achieve a predetermined amount of PPM (parts per million).

The actual injection rate or the rate at which the chemical needs to be added depends upon the application, desired result and also the concentration of the chemical. For example, in case of the amount of chlorine the formula for calculation of the chemical injection rate is:

IR = 0.006xQxC / S

Where Q – System flow rate in GPM, C – Desired PPM for the chemical and S – Concentration of the chlorine bleach in %

There are many methods to arrive at the desired chemical injection rate and usually engineers will specify the exact rate using such methods based upon the application. Once you know the rate of chemical injection which is usually given in Gallons Per Hour (GPH), you need to then start the process of sizing the pump.

The second most important piece of information is the pressure that the pump needs to overcome to inject the chemical. If you are injecting into a pipe then the chemical pump needs to be able to overcome the pressure in the pipe as well as the pressure drop in the chemical lines from the chemical pump to the injection point. A pump injecting into a pipe […]

By |March 30th, 2016|Metering Pumps Tips, News, Selecting the Right Pump|0 Comments

Planning for Your Chemical Metering Pump’s Application (#1 of 8)

This is the first of eight articles in the series Sizing & Selecting the Right Chemical Metering Pump.

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.
Liquid to be pumped

The first thing we take into consideration is the properties of the liquid we are pumping.

Viscosity – If the liquid is viscous it would need to be pump with a slow velocity to allow for the flow of that liquid. If you pump too fast the liquid could cavitate or stall the flow.

Temperature – If the liquid is too hot or too cold it will affect the rest of the pump components. A very hot liquid could need a cooling jacket or materials that can withstand those temperatures. A liquid such as chocolate will solidify and clog the pump and may require a heating jacket to keep it flowing.

Specific Gravity – Heavier liquids will require flow capacity adjustments.

Off Gassing – Chemicals such as Bleach (sodium hypochlorite) could generate gas bubbles and cause air lock in the pump. These may require a de-gassing valve to be incorporated in the diaphragm head.

Concentration – Many times chemicals are diluted with water. A 10% concentration will have very different physical and chemical properties compared to a 50% concentration solution.

Particles – Particles in the liquid could clog the pump internals as well as the pipe. So design will have to keep in mind that the smallest areas in the pump will pass the […]

By |March 22nd, 2016|Metering Pumps Tips, News, Selecting the Right Pump|0 Comments