Recently an article was published that presented an easily constructed Excel sheet that estimates hydrodynamic noise in control valves1. A number of people have asked me if there is something similar for aerodynamic noise.
A veteran of valve sizing with more than 40 years of experience provides his perspective on how to calculate the compressibility factor of a real gas for control valve sizing purposes.
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.
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.
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.
The availability of an easily constructed Excel worksheet that calculates and graphs control valve installed gain in conjunction with the user’s preferred control valve sizing application has prompted a new interest in the application of these calculations. Three examples are shown here.
A simple process method based on the principle that piping pressure losses are approximately proportional to flow squared is presented.
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.
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?
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.
The devastating effects cavitation can have on control valve internals is widely appreciated. In this article, the authors therefore explain the origins of cavitation, provide an easyto-use method to estimate cavitation sound levels and conclude with approaches to reduce or even avoid cavitation.
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.
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.
Many engineers may wonder if it is possible to have flashing liquid flow in a control valve even if 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.
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.
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.
In the chemical processing industry, a significant percentage of measurement devices are not correctly matched to their application. This leads to decreased quality and consistency in their operation.
Valve sizing and proper application of control valves have always gone hand-in-hand. However, the tools available to valve users have changed and improved significantly over time.
Inside of plants today, AC motors are becoming the industry standard. Many plants are shifting to AC motors from hydraulic motors or DC motors when powering heavy loads, which were more popular in the past. This shift can be attributed to a variety of reasons and most have to do with cost.
When selecting the pipes and valves for a cooling system, it is important to understand the options available—and the possible outcomes associated with each selection. Many factors can impact the effectiveness, longevity and quality of the overall cooling system. Learn more.
United Electric Controls has introduced a unique new family of HART capable transmitters that provides programmable switching functionality for industrial process monitoring applications. The One Series 1XTXSW transmitter line is the first to integrate HART 7 compatible 4-20 mA output. Lean more.
Workplace safety is—or should be—a primary focus of every organization, regardless of whether we’re talking about a classroom, an office, a manufacturing facility, or an oil rig. Employees deserve a workspace that is as safe and secure as it can possibly be.
Sysmac is the latest machine automation platform from Omron with integration throughout: from controller to software.
Plant engineers often fail to incorporate correct lubrication into system processes and do not realize its critical importance until something goes wrong.
This is Part IV in a four-part series based on the contents of the new textbook, “Control Valve Application Technology, Techniques and Considerations for Properly Selecting the Right Control Valve.”
Cavitation is the 2nd leading cause of a pump system failure. It’s for this reason that a full understanding of what cavitation is, how it is caused and how it can be prevented is critical in the fluid power industry.
In order to get good control with stability throughout the full range of required flow rates, one must use a control valve that has an installed flow characteristic that is linear, or at least as close to linear as possible in most systems.
Tasked with increased demand for high power output, many operators in North American sectors such as power generation, oil and gas, petrochemical and chemical have been challenged by low-voltage solutions and their associated logistical challenges.
This is Part II in a four-part series based on the contents of the new textbook, “Control Valve Application Technology, Techniques and Considerations for Properly Selecting the Right Control Valve.”
This article discusses the importance of selecting the correct flow characteristic and correctly sizing the valve in order for the valve to properly control the process.
Considering the number of variables, gaining precise control of a process heating application can be a difficult task. In industries with a high demand for consistent quality, controlling the temperature of a substance from the start to the finish of a process is an absolute necessity. Learn more.
An HMI that is expressive, intuitive, and easy to implement makes industrial machines more attractive and competitive. The Omron Sysmac NA Series HMI enables faster, more efficient control and monitoring - and a more natural relationship between operator and machine.
Loss of containment is one of the costliest things that can go wrong at a plant. Accordingly, smart enterprises employ a variety of measures that ensure loss of containment just doesn’t happen – or when it does, the adverse circumstances are kept to a minimum.
A temperature sensor is a key component of any process heating application as it provides temperature feedback about the process, which can be used to monitor or control the process
Certain frequencies of sound can play havoc on industrial equipment. When control valves are not selected appropriately, there is an increased risk for cavitation, which causes high noise and vibration levels, resulting in very rapid damage to the valve's internals and/or the downstream piping.
Advanced Process Control (APC) methods used to be so advanced as to be esoteric- too complex and unusable except by a few high-level experts. Today, however, it seems APC is little talked about for an entirely different reason: It’s become a commodity.
When control valve professionals talk about "control valve sizing," they really mean the entire process of selecting the valve that will do the best job of controlling the process. Selecting the right size valve is an important part of the process, but there are other equally important considerations as well.
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