New Smart Valve Sensor Provides Preventive Maintenance Diagnostics on Quarter-Turn Valves

MVQ 101
The ifm MVQ101 Smart
Valve Monitor
Good news for valve automation companiesifm’s new smart valve sensor, the MVQ101, provides continuous position feedback and preventive maintenance diagnostics on quarter-turn valves. The sensor features built-in functions that can identify different wear conditions via IO-Link, ifm’s digital communication interface. For example, the sensor can indicate a change in the valve’s operation, which can be a warning that deposits are interfering with the valve’s ability to close or that the seal is wearing.

https://teco-inc.com
800-528-8997



Remanufactured Process Instruments Save You Money, Resources and Time

TECO is the world's largest remanufacturer of magnetic flow meters, instrumentation and valves. Their secret is the combination of experience, trained technicians and facilities. TECO can remanufacture virtually any process instrument or valve. Every remanufactured item meets or exceeds the original OEM specifications and performance standards.

Send TECO your worn-out flowmeters, instruments and valves and get them back as good as new (or better)!


Thompson Equipment Company
https://teco-inc.com
800-528-8997

Severe Service Flowmeters by TECO

For flow measurement of extremely abrasive slurries in Mining, Dredging, Fracing, and Oil and Gas Exploration.

Capabilities include:
  • Liners: magnesia stabilized zirconia ceramic, aluminum oxide ceramic, polyurethane rubber, neoprene rubber, Linatex, Teflon (PTFE), rotationally molded Tefzel (ETFE), PFA, and others. 
  • Electrodes: SS, Hastelloy C (C-276), Hastelloy B, zirconium, titanium, platinum/iridium, solid tungsten carbide, tungsten carbide coating, etc. 
  • Exotic tube constructions available (100% titanium).
  • Specialty Coatings: epoxy paints, powder coat, custom colors, etc.
800-528-8997

Happy 4th of July from Thompson Equipment Company

"The United States is the only country with a known birthday. All the rest began, they know not when, and grew into power, they know not how.... There is no "Republican," no "Democrat," on the Fourth of July, — all are Americans."

James Gillespie Blaine


ABB Rotameter (Variable Area Flow Meter) Application Notes

The Variable Area Flowmeter is an instrument for measuring the flow of liquids and gases in pipelines. It includes a vertical tube through which the fluid flows whose diameter increases from the bottom to the top and a float which can move vertically in the tube.

As the flow increases this float moves to a higher position until its resistance to the fluid flow is balanced by the float’s buoyed weight in the fluid, a value which is constant and independent of the flowrate. The position of the float is a measure of the flowrate. The flowrate values can be read on a scale.

Here is a listing of applications where rotameters (variable area flow meters) are commonly used and links to where their PDF documents can be downloaded.

Important Flowmeter Performance Metrics

Animation of differential flow
Animation of differential flow
Common to most flowmeters are rated levels of performance; some of the more universal
performance metrics include accuracy, precision/repeatability, turndown ratio, resolution, ease of installation, straight pipe run requirements, on-going operations and maintenance, and costs.

Accuracy
Accuracy is the difference between a measured value and the actual value. No flowmeter is 100% accurate and most manufacturers provide a range of accuracies in their product line - tighter accuracy requirements are typically more expensive and may also be more restrictive to specific applications.

Precision/Repeatability
The precision or repeatability of a measurement entails the ability to reproduce the same value (e.g., flow rate) with multiple measurements of the same parameter, under the same conditions.

Turndown Ratio
Rotameter
Rotameter
(ABB)
The turndown ratio refers to the flow rates over which a meter will maintain a certain accuracy and repeatability. For example, a steam flow meter that can measure accurately from 1,000 pounds per hour (pph) to 25,000 pph has a turndown ratio of 25:1. The larger the turndown ratio, the greater the range over which the meter can measure the parameter within the accuracy stated.

Resolution
The resolution is the smallest increment of flow that can be incrementally registered by the meter. For example, a water meter designed for a small diameter pipe may be able to provide a resolution of 100 pulses per gallon (or more) as a signal output, but a meter designed for a larger pipe or higher maximum flow may only be able to provide 1 pulse per 100 gallons. Further, a very large flow meter may only be able to provide 1 pulse per 1000 gallons. The metering system may have limitations with regard to peak signal frequency or minimum time between pulses to properly register the data signal.

Ease of Installation
Select make-and-model decisions considering size and weight constraints, specific electrical and communications needs, and the overall environment the flowmeter will operate in.

Magmeter
Magnetic flowmeter
(TECO)
Straight-pipe Run Requirements
Applicable to some types of fluid (gas, liquid and steam) flowmeters, straight-pipe run requirements relate to the length of unobstructed straight pipe required leading up to and immediately following the flow meter’s location. Obstructions in the fluid flow (such as elbows, tees, filters, valves, and sensor fittings) cause changes in the flow pattern (flow regime and velocity profile). Straight-pipe runs allow the flow pattern to normalize/stabilize making measurements by velocity-type and differential-pressure-type flow meters less prone to measurement error. Straight-pipe run requirements are usually expressed in terms of the number of pipe diameters.

The straight pipe requirement is in addition to the length of the flowmeter itself. The straight-pipe run requirements can be reduced with the addition of flow straightening or flow conditioning devices installed upstream.

Ongoing Operations and Maintenance
Vortex flowmeter
Vortex flowmeter
(ABB)
The lowest cost flow metering technology may not be the best choice if it has high associated maintenance costs (e.g., frequent service, calibration and recalibration, sensor replacement). As with most capital purchases, a life-cycle cost approach (including all capital and recurring costs) is recommended for decision making.

Installation Versus Capital Cost
In some situations, the cost to install a flowmeter can be greater than the capital cost; this can be true where system shutdowns are necessary for flowmeter installations, or where significant redesign efforts are needed to accommodate a flowmeter’s physical size, weight, or required connection. In these cases, decision makers should consider alternative technologies that may have a higher capital cost but a much lower installed cost. A good example of this is the use of non-intrusive flow metering technologies (e.g., ultrasonic flowmeters) that typically have a high capital cost but often a significantly reduced installed cost. It is recommended that meters be installed with isolation valves or switches making it easier to remove, replace, or service the meter in the future.

Reprinted and abstracted from US Department of Energy paper titled "Metering Best Practices: A Guide to Achieving Utility Resource Efficiency, "

Severe Service Magmeters for Fracing Operations

Proven in the heat of a West Texas summer, and the cold of an Alberta winter, this TECO magmeter is designed from the ground up to withstand corrosive slurries, acids, bases and solvents.



Severe Application Meter
Severe Application Meter (TECO)
Magnetic flow meters (magmeters) installed on blender trucks are of particular concern. The application involves accurately measuring the flow of an extremely erosive slurry comprised of sand and “frac water” (a mixture of water and harsh chemicals). Replacing failed magmeters can take up to 4 hours, and requires the shutting down of the entire frac spread.

Calling upon sixty-plus years experience in magmeter application, failure analysis, repair, and design, TECO developed several innovative magmeter features intended to improve longevity in fracing operations.

FRAC Trucks
FRAC Trucks
First, TECO developed a ceramic sleeved liner made of “magnesia partially stabilized zirconia”, a very tough ceramic used in severe-service applications that provides corrosion resistance and durability.

Second, TECO developed electrodes built from a solid tungsten carbide billet, which afford unparalleled wear resistance. Given the sand density in the frac fluid, noise reduction is critically important; so, the tungsten carbide is polished leaving a hard, smooth finish that significantly reduces noise in the electrode circuit.

FRAC Sand
Erosive sand tears up
other magmeters. 
Finally, TECO designed the magmeter as a drop-in replacement. It operates with a variety of secondaries and matches the “lay length” of the meter being replaced. There is no need for a new transmitter and no need for repiping, allowing for simple retrofit in existing installations.

Internal view of TECO SAM after 500,000,000 pounds of sand
Internal view of SAM after 500,000,000
pounds of sand flowed though the core.
Upon inspection, the customer found the
flow tube to be looking “brand new”.
In 2017 TECO introduced the SAM (Severe Application Meter) magmeter as a flow meter designed specifically for hydraulic fracturing operations. By specifying SAM, operators save money through increased uptime; decreased health, safety and environmental risk; and reduced costs related to magmeter purchase and repair.

Download the PDF version of this article here.

Contact TECO by visiting https://teco-inc.com of call 800-528-8997 for more information.

Oval Gear Flow Meters: Accurate, Robust, and Long Life

Oval Gear Flow Meters Although there are many types of flow meters used to measure fluid flow rates, positive displacement (PD) designs, including Oval Gear flow meters, are unique as they are the only meters on the market that directly measure actual volume. All other metering techniques infer the volume by making a type of measurement and equating it to the flow rate.

One of the key criteria in selecting the right flow meter is the degree of accuracy dictated by the application. To meet high-precision requirements in various industrial environments, Oval Gear flow meters fit the bill. These meters feature a wide flow range, low pressure drop and extended viscosity range. Oval Gear flow meters offer easy installation and high accuracy, plus measure high temperature, viscous and caustic liquids with simple calibration.

Oval gear flow meters are simple and robust. They operate by interlocking two oval gears, offset by 90 degrees, inside the meter housing which are then rotated by the flowing media. They are very rugged and designed to operate in very harsh environments. Accuracy is maintained irrespective of temperature, viscosity change, or flow pulsation. It's not unusual to see these meters perform in the field for upwards of 40 years.
Flow path and operation of Oval Gear Flow Meter
Flow path and operation of Oval Gear Flow Meter
Oval Gear flow meters are an excellent choice for any number of industrial applications including:
  • Chemicals
  • Petrochemicals
  • Water and Wastewater
  • Oils and Diesel Fuel
  • Pulp and Paper
  • Paints and Coatings
  • Printing
Download Oval Gear flow meter brochure here.

For more information on Oval Gear flow meters visit https://teco-inc.com or call 800-528-8997.

Compact and Ultrafast Response Temperature Transmitters: The IFM TA2

TA2 temperature instrumentTraditional temperature sensors are constructed from multiple components, assembled and calibrated together. The assembly and calibration of the components is time consuming and requires a high level of skill. These temperature instrument assemblies, due to their open design, are susceptible to moisture, corrosion and other environmental conditions which are a major cause for instrument stress.  Furthermore, periodic maintenance for verification of calibration is needed, adding costs that directly affect profitability.

IFM's innovative TA2 temperature instrument solves this problem. Constructed of 316 stainless steel, this fully laser welded,  one piece hermetically sealed instrument is rated IP69K. There are no points of ingress to cause drift or damage the sensor and they are fully calibrated during manufacture and ready to use right out of the box. The sensor is pre-scaled in various popular ranges and fully scaleable to custom ranges using the IO-Link communication and programming tool.

With a compact 3-1/4" diameter and 1-1/2" long housing, the TA2 installs into the tightest locations. A bright led located in the M12 connector gives visible indication that the sensor is operational. Wiring is conventional 2-wire loop power for easy installation.

The IFM TA2 transmitter line is available both with standard threaded process connections for standard applications, and the popular sanitary process connection, for applications in the food and beverage industries.

Finally, the TA2 temperature transmitters dramatically reduce response time. The standard fast response unit can react to 50% of the temperature change in less than 1.0 second, and just 3.0 seconds to 90%, while the ultrafast versions react in just 0.5 seconds and 1.0 seconds, respectively.

For more information on the IFM TA2, call TECO at 800-528-8997 or visit https://teco-inc.com.

Failed Flowmeter - Replace with New or Remanufactured?

New or Remanufactured Flow Meter
Many companies don't realize that when you have a failed mag meter or mass meter, it's often more cost-effective and efficient to have them restored to mint condition, than it is to replace them with new units.

But if you send meters to the original manufacturer they can disappear into their system for weeks or months. And you have no idea how long it will really take, or if it will fail again later from undetected problems. The fact is you can't afford the loss of productivity or downtime. But what if there were a place you could send broken flow meters that could save you money and time by restoring them to pristine condition. A cost-effective specialist who could guarantee rapid turn around time and premium customer service. A team of experienced professionals with the capabilities to keep equipment in service, even if it's no longer supported by others.

For a proven partner like this, there's only TECO. Established in 1947, TECO has become the global leader in restoration and customization of magnetic flow meters, Coriolis meters, and other process control instruments.

TECO understands that time is money, which is why they provide the fastest turnaround time in the
industry. They don't simply repair a broken part and return it, they do a full restoration and back the whole meter with a full warranty. Their quality control includes NIST traceable flow calibration, which is often required by regulatory agencies, and ISO 9000 standards. They also provide independent calibration to serve your preventive maintenance and metrology needs.

While their low cost, high quality work has made them the industry leader, it's their commitment to premium customer service that keeps their clients loyal. Extensive capabilities, combined with a focus on service, also means they can manufacture custom flow meter solutions to meet the demands of severe applications.
  • Low cost, rapid restoration of mag meters, mass meters and other instruments. 
  • Pristine, like-new equipment, backed with a full warranty. 
  • Customized solutions and expert customer service you can trust. 
It's all part of the package with TECO.

If you have failed mag meters, Coriolis meters, or other instruments, call TECO today. After receiving your equipment they'll turn around a quote in 48 hours or less - no return authorization required. To develop a customized solution for your needs, contact TECO.

Phone (504) 833-6381
Visit https://teco-inc.com

Top 5 Reasons TECO Consistency Transmitters Stand Above the Competition

  1. TECO Consistency Transmitters are shipped with built-in flow-rate compensation. This is important because blade style consistency sensors are sensitive to shifts in production flow-rate. This means that their output has a component which is strictly a function of flow-rate. If this isn’t compensated for, changes in flow-rate will look like changes in consistency. TECO Consistency Transmitters include a flow-rate input so that this flow-rate function which automatically gets applied to the consistency signal. This feature is unique to TECO.
  2. The key feature of our C3000 and C5000 probe style sensors is that they aren't sensitive to flow-rate changes to begin with. The C3000 and C5000 are insensitive to shifts in production flow-rate below 3.0 fps. This means that as long as the flow-rate stays below 3.0 fps, shifts in flow-rate will not produce any negligible affect on the probe output signal. For flow-rates above 3.0 fps when using C3/5000 series sensors, it is recommended that active compensation be used.
  3. The C5000 sensor is retractable, allowing it to be removed from an active process. This feature is particularly useful when installed in hostile measurement environments, such as blow lines and bleach plant operations. The retractable feature allows for quick change-out when it comes time for replacement, allowing the restoration of a critical measurement in minutes, instead of waiting weeks or months for a scheduled shutdown. This is a strong competitive advantage for C5000 users.
  4. All TECO sensors are hot-swappable, saving the time and effort of a recalibration procedure when a sensor is replaced. All that is required is use the built-in normalization procedure and "zero" the replacement sensor. Your new sensor is ready to use.
  5. TECO consistency transmitters can be upgraded to act as a consistency controller, or function as multi-input controller, so that other process parameters can be adjusted for in the consistency control loop.
More Reasons:
  • TECO consistency transmitters can also be set up as a dilution controller.
  • 100% Made in the USA. 
  • TECO consistency transmitters are very competitively priced.
More information at https://teco-inc.com
800-528-8997

Flow Meter Designed for Corrosive Slurries, Acids, Bases & Solvents

TECO Severe Applications Meter (SAM)

A patent pending magnetic flowmeter with abrasion resistant ceramic trim that exceeds the capabilities of Alumina or Yttria Zirconia. Capable of withstanding a variety of corrosive slurries, acids, bases, and solvents.

800-528-8997

Severe Service Flow Meters by TECO



Stock Prep Solutions - Helping Paper Manufacturers Stay in Business

Stock Prep
The concept behind stock prep is to manage the raw materials being added to the process so the finished stock meets the requirements of the paper machine and the final quality of the finished product. Finished stock is a suspension of fibers, additives, and impurities matching a defined level of quality, which ultimately determines the operation of the machinery and the quality of the final product. Most of the machines used for individual processes provide not only the desired effect, but also may produce undesirable side-effects. Implementing process controls to reduce or eliminate these undesirables help paper producers gain considerable improvements in quality, consistency, and yield.

This video introduces, and presents a case for, specific process instrumentation designed for stock prep.

http://www.teco-inc.com
800-528-8997

What Are Rotameters?

rotameter
Rotameter (ABB)
Rotameters are a type of variable area flow meter used for measuring the volumetric flow rate of a fluid. A tapered tube, usually glass, has a float that gets pushed by the drag force of the flow being measured and is pulled down by gravity. The simple operating principle and design makes rotameters a popular choice, and they are able to measure high flow rates as well as very low flow rates.

The rotameter has a number of advantages for use in a process. No external power or fuel is required, only the corresponding flow and gravity. They are simple devices that can be produced from low-cost materials, which is a main reason for the rotameter’s widespread use across many applications. Additionally, the area of the flow passage increases when the float moves, resulting in a linear relationship. The clear glass used also allows for a low risk of thermal shock and resulting issues from measuring chemicals. Rotameters also typically do not experience large drops in pressure, are simple to install, and are repeatable for long periods of time as long as they are operating under the same process conditions.

A few limitations exist in rotameters, the first of which relates to the fact the rotameter relies on displacement to function. A rotameter made to measure a certain substance at a particular temperature is only going to be accurate when measuring the substance and process qualities originally intended. While a rotameter can be scaled to measure different densities and viscosities, a limitation exists when the fluid characteristics being measured change in complexity. Secondly, while floats are often designed to function independent of viscosity, it can be difficult to ensure their effectiveness. Additionally, measurements being evaluated via rotameters can be uncertain when the float oscillates or near the bottom of the scale being used by the rotameter.

Certain fluids may also obscure the reading on the rotameter since the reading must be read through the flowing medium. This limitation can be countered by coupling he rotameter with a transducer in certain process applications. Another option for readability involves using a magnetic float that can be accompanied by a follower outside the tube, allowing the operator to easily read the measurement.

For more information about rotameters, visit https://teco-inc.com/ABB.

Positive Displacement Flowmeters

Positive displacement flowmeter.
(Badger Meter Blancett)
Positive displacement flowmeters use fluid to mechanically move internal components such as pistons, gears and discs to measure flow.  These devices are both precise and simple to operate.

The positive displacement flowmeter, in contrast with other types of flowmeters, directly measure the volume of fluid passing through the meter instead of employing inferential flow measurement. The rotational velocity of the rotor in the flow meter is directly proportional to the rate of flow. Electronic versions of positive displacement meters rely on magnets to activate sensors in their fluid chambers, whereas their non-electrical counterparts rely on the rotation being driven by the fluid flow.

The operating principle of the positive displacement meter may be simple, yet the flowmeter type offers a few specific advantages for industrial application. A main benefit of this flowmeter is a high level of accuracy due to its internal components. The accuracy of the flowmeter is directly related to the size of the clearances, or the space between the sealing faces.

These flowmeters are also particularly useful for handling a high range of viscosities. As the fluid viscosity increases with the positive displacement meter, less slippage or bypass will occur, meaning more total fluid will pass through the positive displacement meters. In addition to these design-based advantages, the positive displacement meter typically allows for excellent repeatability and linearity.

The longstanding use of positive displacement flowmeters across various industries has been a source of stability in terms of design, with the most recent advancements in positive displacement technology focusing on maintaining precision at lower costs.

There are a few known limitations for the use of positive displacement meters. The meters are not the optimal choice for measuring fluids with large particles, and are also non-ideal for measuring fluids with large air pockets. Additionally, systems using positive displacement meters need to account for slight pressure drops in the positive displacement meter. While the meters are able to accurately measure non-lubricating fluids, using positive displacement flowmeters to measure these types of liquids will not be as efficient as using the flowmeter for lubricating fluids. Overall, these types of flowmeters are a cost effective, accurate and volumetrically based flow measurement solution.

For more information on positive displacement flowmeters, call Thompson Equipment Company (TECO) at 800-528-8997 or visit https://teco-inc.com.


An Easy Way to Understand Laminar Flow vs. Turbulent Flow

Image courtesy of Wikimedia.org
Laminar flow occurs when a fluid flows in parallel "layers" with no interaction between the layers. When flowing at low velocities, fluids tend to flow without lateral (sideways) mixing, and adjacent layers glide past one another, analogous to playing cards sliding between others in a deck.

In contrast to laminar flow, turbulent flow, caused by excessive kinetic energy in parts of a fluid flow, undergoes mixing and lateral irregularities characterized by eddies, recirculation, and apparent randomness. Fluid speed magnitude and direction changes chaotically in turbulent flow.

The video below provides a very simple, but very effective, demonstration of laminar and turbulent flow.

https://teco-inc.com
800-528-8997

Get Your Process Flow Meters Remanufactured Instead of Buying New

Remanufactured Flow Meters
Cutaway before and after of remanufactured flow meter.
Head scratcher. Why buy brand new flow meters when there are companies in the USA that have the trained technicians and facilities ready to remanufacture your old flow meters to a condition better than new?

Remanufactured flow meters meet or exceed all OEM specifications and performance standards. Here's how it works. Experienced technicians break down your flow meter to it's core components - flowtube, electronics, enclosure, flanges, and electrical. All parts are evaluated for wear and tear. All components are cleaned, primed, and painted. New electronics, flow sensors, liners, and electrical connections are installed. Once assembly is complete, the "remanufactured" flow meter goes through an exhaustive quality control process and is calibrated to NIST traceable standards using an advanced, state-of-the-art calibration facility.

remanufactured flow meter
Remanufactured flow meter.
All this is done very efficiently, quickly and cost-effectively.  You just ship your old instrument in to the attention of the "Repair Department". No RMA is required. The company evaluates your old flow meter and then generates a quote with delivery time for the remanufactured meter (normally within 48 hours).

Here is a summary of the benefits for choosing remanufacturing:
  • All brands of flow meters are candidates.
  • NIST traceable certificate is provided.
  • Obsolete flow meters are no problem.
  • No evaluation fees charged.
  • Accessories are included.
  • New warranty is given.
  • Failure analysis is provided.
  • Flow meters can be repurposed for severe service (enhanced during remanufacturing).
  • Remanufacturing is GREEN and environmentally friendly.
For more information, visit this flow meter remanufacturing link or call 800-528-8997.

Industrial Plug Valves

plug valve
Plug valve diagram showing
plug shape and orifice.
There are common components to be found on almost every process system that involves fluid control. Regardless of the operation's scale, pumps, piping, tanks and valves are likely to be part of the system.

Valves, of which there are many types, provide control over the flow rate, direction and routing of fluids in a processing operation. Flow can be started, stopped or modulated between zero and full rate using a properly sized and configured valve. Some valves enable media flow to be diverted to a selection of outlets, in lieu of a single inlet and outlet pair. Specialized valves regulate inlet or outlet pressure, or prevent fluid flow from going in an undesirable direction. All of these capabilities are packaged into differing valve product offerings that present a very large selection array to a process designer or engineer.

Industrial flow control valve types are generally classified according to the structure or arrangement contained within the valve body that provides obstruction to fluid flow. Some of the common types are ball, butterfly, gate, globe, and plug. Surely, there are more valve types, and this article is not intended to list them all. Some of our previous blogs have discussed selection considerations for gate, ball and butterfly valves. This article will focus on one of the oldest valve types, the plug valve.

Plug valves, like ball and butterfly valves, span from fully open to fully closed positions with a shaft rotation of 90 degrees. The “plug” in a plug valve is installed in the flow path within the valve body and rotated by means of a stem or shaft extending to the exterior of the body. Plugs are often tapered toward the bottom and are fitted to a seating surface in the valve body cavity that prevents fluid from bypassing the plug. An opening through the plug, the port, can be shaped to provide particular flow characteristics. There are numerous variants of the basic plug valve which may make it suitable for particular applications. One common variant is the lined or sleeved plug valve, with an insert or interior lining of material that creates an isolating barrier between the valve body and the media. This allows use of less expensive materials for the body construction that may be otherwise subject to corrosion by exposure to aggressive media.

Plug valve advantages:
  • 90 degree rotation from open to closed provides fast operation.
  • With proper configuration, can be well suited for frequent operation.
  • Availability of corrosion resistant liner may provide comparative cost savings because valve body can be constructed of less expensive material.
  • Design is simple and employs a low parts count.
  • Valve can be serviced in place.
  • Generally, low resistance to flow when fully open.
  • Reliable leak-tight service due to tapered plug wedging action, replaceable sleeve, and injection of lubricant in some variants.
Plug valve disadvantages:
  • Higher friction in the plug closure mechanism may require comparatively higher operating torque than other valve types.
  • Without a specially designed plug, generally not well suited for throttling applications.
  • Rapid shutoff delivered by plug design may not be suitable for some applications where hammering may occur.
Share your fluid control application challenges with a valve and automation specialist. Leverage your own knowledge and experience with their product application expertise to develop an effective solution.

Contact Thompson Equipment (TECO) for all your valve automation and valve repair needs.

https://teco-inc.com
800-528-8997

What Are Orifice Plates?

Fig. 1 - Orifice Plates
The orifice plate is the simplest of the flowpath restrictions used in flow detection, as well as the most economical. Orifice plates are flat plates 1/16 to 1/4 inch thick. They are normally mounted between a pair of flanges and are installed in a straight run of smooth pipe to avoid disturbance of flow patterns from fittings and valves.

Three kinds of orifice plates are used: concentric, eccentric, and segmental (as shown in Figure 1).

The concentric orifice plate is the most common of the three types. As shown, the orifice is equidistant (concentric) to the inside diameter of the pipe. Flow through a sharp-edged orifice plate is characterized by a change in velocity. As the fluid passes through the orifice, the fluid converges, and the velocity of the fluid increases to a maximum value. At this point, the pressure is at a minimum value. As the fluid diverges to fill the entire pipe area, the velocity decreases back to the original value. The pressure increases to about 60% to 80% of the original input value. The pressure loss is irrecoverable; therefore, the output pressure will always be less than the input pressure. The pressures on both sides of the orifice are measured, resulting in a differential pressure which is proportional to the flow rate.

Segmental and eccentric orifice plates are functionally identical to the concentric orifice. The circular section of the segmental orifice is concentric with the pipe. The segmental portion of the orifice eliminates damming of foreign materials on the upstream side of the orifice when mounted in a horizontal pipe. Depending on the type of fluid, the segmental section is placed on either the top or bottom of the horizontal pipe to increase the accuracy of the measurement.

Eccentric orifice plates shift the edge of the orifice to the inside of the pipe wall. This design also prevents upstream damming and is used in the same way as the segmental orifice plate.
Orifice plates have two distinct disadvantages; they cause a high permanent pressure drop (outlet pressure will be 60% to 80% of inlet pressure), and they are subject to erosion, which will eventually cause inaccuracies in the measured differential pressure.

Contact TECO with any process flow question or requirement. You can find them by visiting https://teco-inc.com or by calling (504) 833-6381.

Industrial Control Valve Design and Operation

Control valves
The design and operation of industrial control valves  is very important to understand if you work as a process engineer, a plant maintenance person, or if you design process control loops.

Control valves are used extensively in power plants, pulp and paper mills, chemical manufacturing, petro-chemical processing, HVAC and steam distribution systems.

There are many types, manufacturers, body styles, and specialized features, but the they all share some basics operating principles. The video below explains components, operation, and fundamentals.

TECO designs automated control valve systems for all major industries including chemical, pulp and paper, petro-chemical, power generation, and water treatment.  TECO’s experience and engineering background make them a uniquely qualified partner for your next automated valve requirement.

https://www.teco-inc.com
800-528-8997

ABB Rotameters Quality and Performance a Legacy of Fischer and Porter Roots

The Fischer & Porter Company, founded in 1937, was a well-known and respected manufacturer of
process instrumentation. The Fischer and Porter brand has long been associated with an industry-leading range of flow measurement products. The legacy is strong though, and despite the F&P brand being shelved, their rotameter (variable area flowmeter) line is still referred to by some old-timers as "Fischer and Porter Rotameters" or "F&P Rotameters".

In 1994, Fischer & Porter was acquired by Elsag Bailey Process Automation as a strategic union to blend Elsag Bailey's expertise in distributed systems with Fischer & Porter's expertise in process instrumentation. In 1999 ABB acquired Elsag Bailey and moved the F&P products in to a larger portfolio of ABB process instrumentation and the Fischer and Porter line of rotameters became known as ABB rotameters.

Today, Fischer & Porter products are fully integrated into the ABB portfolio of process instrumentation products which include variable area flowmeters (rotameters), magnetic flow meters, vortex shedding meters, and mass flow meters.

In 1947 Thompson Equipment (TECO) was the first firm ever appointed to represent and sell the Fischer & Porter Rotameter line.  TECO proudly continues that relationship today and specifies, services, and sells ABB Rotameters nationwide.  TECO also maintains a large inventory ready for same-day shipment. For more information, visit https://teco-inc.com/ABB or call 800-528-8997 for immediate service.

Thermo Scientific Belt Scale Maintenance

Thermo Scientific Belt Scale
Thermo Scientific Model 10-14, 10-17, 10-20, 10-30, and 10-101 Belt Conveyor Scales

Belt conveyor scales have become an important part of most bulk material handling facilities. However, being relatively unobtrusive in most conveyor systems, they are often overlooked or ignored after their initial installation. Lack of simple maintenance will potentially cause significant reduction in the accuracy capabilities of these instruments. Most belt conveyor scales are capable of providing reliable results within ±0.50% of their full-scale rating. Belt conveyor scales that have been certified via the National Type Evaluation Program (NTEP) are capable of providing results that meet the criteria of the National Institute of Standards and Technology (NIST) Handbook-44, which is 0.25%. This is defined as being within 0.25% of actual material load and repeatable within a 0.25% bandwidth.

Regardless of the accuracy capability of the scale design, it is unlikely that these devices will perform as promised if simple maintenance procedures are not strictly adhered to. Every scale installation will develop its own set of operating characteristics; therefore it is absolutely necessary to monitor the scales performance and provide routine maintenance as required. It is generally advised, throughout the belt scale industry, that calibration checks be made frequently during the weeks after initial installation, then to increase the time frame between calibrations as statistical results are obtained. While this is a simple suggestion to follow, all too frequently the increase in time between calibration verifications defaults to only whenever a problem is suspected. By then it is too late, incorrect weighments have been made, processes have been interrupted and inventory levels need other means of verification.

Establishment of a routine inspection procedure, including not only the belt conveyor scale, but the entire material handling system, will result in an increased confidence in the scale and ultimately greater control of the accuracy it is providing. It is important to remember that the entire conveyor that the belt scale is installed in becomes part of the “weighing system,” and that any changes that occur or are performed within this conveyor can and probably will affect the performance of the scale. Therefore, in addition to a routine scale maintenance procedure it becomes imperative that any and all maintenance performed on the conveyor be reported to the individual or department responsible for the scales performance.

Verification of the basic mechanics of the conveyor system itself is an integral part of the scale maintenance procedure.

Please see Thermo Scientific Belt Conveyor Scale Maintenance Check List below.