Water Treatment

Below you will find white papers on topics involving process control and automation.

Rotary Valves Can Prevent Stem Seal Woes

Submitted by Peter Jessee || Valin Corporation

Experienced process control engineers follow familiar, time-tested steps when presented with a new system to design and specify. Selecting a control valve for a process always requires the same information: collection of the process conditions, calculating required capacity and determining the materials that will survive in the process stream. But some process streams present more challenges than others.

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Coalescing 101: Sizing and Considerations

Submitted by Joe Bodle and Norm Hall || Valin Corporation

In the world of industrial filtration, one of the most common activities involves the removal or displacement of water from another liquid. However, this process is further subdivided into three distinct phases. Chronologically, the first of these phases is particulate filtration (sometimes referred to as prefiltration).

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Rainwater Diversion Strategies

Submitted by Dave Molinari || Valin Corporation

Rainwater can collect oils, contaminants, and chemicals as it touches the ground. Fortunately, technology exists to treat the initial rainwater, and it has been utilized in certain parts of the country for some time. However, as more people become aware of this functionality, its applications are gaining popularity all across the country.

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Condition Monitoring: What Are We Measuring?

Submitted by Corey Foster || Valin Corporation

The concepts of preventive maintenance and condition monitoring are not always characterized in a way that is entirely accurate. They sometimes seem to be treated as a one-size-fits-all service that many operators believe they need. However, these concepts can mean very different things depending on the application.

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Excel-Worksheet Predicts Control Valve Hydrodynamic Noise

Submitted by Jon Monsen || Valin Corporation

Most control valve manufacturers include IEC 60534-8-4:2015 in their control valve sizing and selection software to predict control valve hydrodynamic noise. However, users who want to make quick noise predictions or who want to construct valve sizing applications, programming the above noise standard can be a daunting task. 

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Simplified Methods for Liquid Control Valve Sizing

Submitted by Jon Monsen || Valin Corporation

If one wants to be able to do accurate hand calculations, or construct a simple program or Excel sheet, the method described here gives answers that agree exactly with iterative calculations using the equations in the current version of the ISA and IEC standards.

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Does Strainer Technology Make Sense for Your Process?

Submitted by Kari Kohonen || Valin Corporation

The key to developing the ideal filtration mix which achieves the desired results is to gather as much information as possible so that the right decisions about filtration can be made. Kari Kohonen from Valin Corporation examines whether introducing strainer technology can be advantageous.

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Using Control Valve Installed Gain Calculations

Submitted by Jon Monsen || Valin Corporation

The availability of an easily constructed Excel worksheet that calculates and graphs control valve installed gain in conjunction with the users preferred control valve sizing application has prompted a new interest in the application of these calculations. Three examples are shown here.

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How to Monitor Assets Remotely Today

Submitted by Corey Foster || Valin Corporation

As long as products have had ethernet ports, people have been asking for remote access to them. They believed they could just plug the devices into the internet, and it would all work. As more software tools became available and internet speeds increased, capable users found ways to give themselves access, however, there was a catch.

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Determining Pressure Drop for Control Valve Sizing

Submitted by Peter Jessee || Valin Corporation

Most people who are familiar with control valves have seen the formula for calculating the valve capacity (Cv) required to pass a given flow rate of water. This seems fairly straightforward until you ask yourself, what is the correct value of differential pressure to use?

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Maintaining an Enclosure’s Integrity

Submitted by Fred Gridley || Valin

Maintaining a consistent internal environment for your enclosures is critical for equipment to function properly. The National Electrical Manufacturers Association (NEMA) has defined standards for specific enclosures designed for the application and environment when correctly installed. Learn more.

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Stop Cavitation from Destroying Your Control Valve Trims

Submitted by Dr. Jon F. Monsen and Dr. Hans D. Baumann

The devastating effects cavitation can have on control valve internals are widely appreciated. In this article, the authors therefore explain the origins of cavitation, provide an easy-to-use method to estimate cavitation sound levels, and conclude with approaches to reduce or even avoid cavitation.

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Installation Practices Key to Successful Heat Tracing

Submitted by Jay Van Horn || Valin Corporation

Laying out an effective heat tracing design requires careful attention to detail. Every aspect of the system must be meticulously considered, including both the temperature requirements of the fluids being protected as well as the physical characteristics of the equipment being heat traced.

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The Case for High Flow Cartridges

Submitted by Tim Tritch || Valin Corporation

For many years, the industry has been guided to a liquid filter cartridge with an outside diameter (OD) measuring 2.5" or so with an inside diameter (ID) measuring 1", and a length that varied from 5" to 40". Of course, there are always a few exceptions. Learn more.

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Liquid Flashing in a Control Valve Without Choked Flow

Submitted by Jon Monsen, Ph.D., P.E., Valin Corporation

Many engineers may wonder if it is possible to have flashing liquid flow in a control valve even if the flow is not choked. The short answer is yes, but it is not very common. This article provides a more detailed answer to this question.

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Why Equal Percentage Valves Act Linear

Submitted by Jon Monsen, Ph.D., P.E., Valin Corporation

I was recently asked how the installed flow characteristic of an equal percentage valve in a system that includes a significant amount of pipe or other pressure-consuming elements "magically" becomes a linear, or approximately linear, installed flow characteristic.

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iPolymer High Purity PTFE Pressure Regulator

Submitted by iPolymer

The iPolymer PTFE Pressure Regulator is designed for use with high-purity water systems and aggressive chemical applications to regulate and maintain a constant pressure downstream of the valve and prevent over-pressurization of sensitive equipment.

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Controlling Compressor Vibration and Surge

Submitted by Jim Slama || Valin Corporation

Controlling vibration and surge is one of the most critical aspects of keeping centrifugal and reciprocating compressors up and running. If improperly monitored and maintained, these types of compressors can experience frequent functional issues and ultimately shorten their life span.

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