NACE - Materials Performance Webinar

Summary

The technical challenges of alternating current (AC) mitigation within cathodic protection systems are a major and growing concern for owners and operators of critical infrastructure across the world.

Urban centers continue to expand and the co-location of pipeline infrastructure and high-voltage AC infrastructure is becoming common practice. Furthermore, as pipeline coatings continue to improve, the slightest defect in coating will cause a high concentration of AC current at that point – a major risk for rapid AC corrosion.

New technologies designed to help mitigate the risks of AC corrosion are advancing and constantly evolving, which can dramatically improve how operators manage these risks. Furthermore, remote monitoring and data collection devices can help operators optimize their mitigation strategies, ensuring that critical budget dollars are allocated in the most efficient manner.

Please join us as we review these AC mitigation technologies and more.

Speakers

Tony da Costa, VP of Engineering – MOBILTEX

Tony has been with MOBILTEX for over 20 years and is currently the VP of Engineering. He is responsible for leading an experienced team of hardware and software development professionals in bringing the future product vision to fruition in a timely manner and ensuring that existing product feature sets grow with the needs of the customers. Tony also oversees all product and assembly processes within the company. Tony holds a Bachelor of Applied Science in Electrical Engineering with Computer Option from the University of British Columbia.

Phil Eggen, Senior Business Development Leader – Dairyland Electrical Industries, Inc.

Phil has over 20 years of pipeline engineering experience, with the last 15 in integrity management and corrosion engineering. His experience was initiated at Nicor Gas as a corrosion manager for over 24,000 miles of steel pipe and extended to EN Engineering where he managed the Corrosion Engineering Team for 6 years. Phil is now at Dairyland Electrical Industries where he is helping customers solve AC mitigation and station decoupling issues. Phil has been active in NACE for over 10 years through the local section and through the NACE national meetings. He has also served on the American Gas Association (AGA) Corrosion Committee. Phil is a registered Professional Engineer in Illinois and holds a NACE CP2-Cathodic Protection Technician certificate.

+Transcript

(WM)

Thank you very much Gretchen!  Mobiltex is thrilled to have the opportunity to present to so many of our industry colleagues today, so thank you for your time and interest in attending. We hope that everyone is well.

Mobiltex is especially pleased to be joined on this webinar by an industry leading company in Dairyland. Who better to help us all understand AC interference challenges and mitigation strategies than a leader in this market segment?

Welcome to ‘Developing a Leading Technology Strategy to Mitigate AC Interference’.

(WM)

For those of you attending your first Mobiltex webinar, time for some brief introductions. My name is Will Maize and I am Product Manager at Mobiltex. I’m very pleased to introduce our presenters for today. From Mobiltex, Mr. Tony da Costa.

(TDAC)

Good day everyone.  As Will mentioned, my name is Tony da Costa and I’m the VP of Engineering at Mobiltex.  I head up the team that quickly and creatively transforms Will’s customer product research information into useful industry-leading products for our customers.  My background is in Electrical Engineering with a specialty in data communications systems.  Over the last 28 years, I’ve put that knowledge to use in various specialized IoT product development efforts. That includes many of Mobiltex’s current product offerings.

(Will)

Thanks Tony! Now to introduce Tony’s co-presenter, Mr. Phil Eggen from Dairyland.

(PE)

Thanks Will – Good Day everyone!  I am Phil Eggen and I am part of the Business Development Team here at Dairyland Electrical Industries.   I have a background in cathodic protection, pipeline integrity management and pipeline design and I have been in the industry for over 21 years.  I am a licensed professional engineer and a NACE CP Technician.  I have worked on multiple AC mitigation projects and I understand the importance of specifying quality materials for mitigation and monitoring.

Back to you Will.

(WM)

Now for a brief overview of the webinar.

Tony will lead us off by providing a brief refresher on cathodic protection concepts before introducing todays topic of AC Interference. He’ll delve into the details of the what, why, and where it is a challenge, and outline just how large of a problem it has become.

Next, Phil will guide us through how AC Interference is commonly mitigated. He will provide a deep dive into the challenges of mitigating AC interference on a cathodic protection system.

After that, Tony will provide discussion around how data collection and remote monitoring systems can improve mitigation strategies.

To conclude, I will provide a real-life example of the discussion in practice, and we will open up the floor to questions.

Now, let’s begin.

(WM)

Tony, can you please give us a brief introduction to cathodic protection and introduce what AC interference is?

(TDAC)

Normally, pipelines are protected against electrochemical corrosion, more commonly known as rust, by coatings that are applied to the outside of the pipes. However, defects in the coating, called holidays in industry terminology, allow contact between the metal in the pipe and the surrounding environment, which leads to rusting of the pipe at the coating defect location.  This rusting eventually leads to perforation of the pipe and along with that leaks of the product carried by the pipeline.

To ensure the long-term protection of the pipeline against this rusting, cathodic protection, often consisting of impressed current rectifiers and sacrificial galvanic anodes, can be installed to polarize the pipeline and prevent the normal chemical reaction that causes rust at the defect locations. The assets in front of you are all common components of a cathodic protection system, specifically applied to a pipeline. Test stations are locations, typically spaced at increments of one mile or less, where a variety of readings can be taken easily. The impressed current rectifiers and sacrificial anodes, acting in independent systems, are the assets that deliver energy to reverse the corrosive chemical reaction in a manner that is very similar to recharging a battery.  The use of these two corrosion mitigation techniques is commonly known as cathodic protection, a key practice in the safe and efficient operation of critical energy infrastructure.

(TDAC)

The topic today, however, is AC interference and mitigation, which is relevant when the pipeline passes across, or parallel to, a high voltage AC power line. The size and length of the metallic pipeline makes it a prime candidate to interact with the electromagnetic fields of the high voltage AC line from three main types of AC interference; capacitive coupling, inductive coupling, and resistive coupling. The main challenge for operating pipelines is inductive coupling, caused as the pipeline has potential induced from the fluctuating, and often high loads, of the AC current present in co-located HVAC line.

Let’s go a bit further.

(TDAC)

If you think back to basic electrical principles, passing an alternating electrical current through a wire develops an alternating magnetic field around the wire.  Placing another completely isolated wire next to the first has that magnetic field inducing an alternating driving potential in the second wire.  You might be most familiar with this phenomenon in the form of a transformer.  An AC source is applied to the primary of a transformer, the secondary winding puts out a voltage.  That same principle applies here to the pipeline that is next to the high voltage AC line.

In the pipeline, inductive coupling occurs as a result of the magnetic field that is created around the electric conductors in the high voltage AC power line system. Each conductor creates a magnetic field with a direction and magnitude that is related to the direction and magnitude of the alternating current flow in the conductor. When a pipeline is within an area of influence from the magnetic field, the magnetic field will induce an alternating potential on the pipeline, just like in a transformer.

Once induced into the pipe, the current will look for a route to dissipate to ground, and in the case of a coated pipeline, it will always find the path of least resistance at locations where the coating has weakened – at the aforementioned holiday. It is very important to note that induced current is not only a hazard because it influences corrosion, it is also a significant safety hazard for workers that are working near the pipeline. Induced AC voltages are large enough to cause severe bodily harm.

(TDAC)

To protect the pipeline from AC corrosion, and mitigate the induced AC current, certain measures are commonly deployed.  Polarization cell replacements (PCR) and solid state decouplers (SSD) are often part of an effective AC mitigation system. These devices provide both DC isolation and AC grounding of the pipeline, enabling induced AC current, faults and lightning strikes to flow to ground, while leaving the DC cathodic protection (CP) system unaffected. Decouplers are also critical to optimize the CP system by preventing the protective DC current from flowing to structures that may be electrically connected to the pipeline, such as zinc or copper AC mitigation wires and safety grounding systems. I’ll let Phil get into this topic in more detail a little bit later in the webinar.

Now let’s turn to why AC interference is a growing concern.

(TDAC)

Since the turn of the last century, population growth and the growth of our cities and suburbs has catalyzed a massive investment in basic infrastructure. This growth is reflected in the vastness of the energy and utility infrastructure networks in North America, from gas and water pipelines to electrical powerlines. Watch now as we layer these assets. First, [FLIP] we add petroleum pipelines, now [FLIP] crude oil, [FLIP] hazardous liquids, getting very dense [FLIP] with natural gas, and finally [FLIP] high-voltage powerlines.

As urban sprawl has also influenced the price of land, municipalities are increasingly seeking to co-locate oil and gas pipeline assets with high voltage AC lines, and vice-versa. However, oil and gas pipelines face a serious, ongoing risk of corrosion when they are installed located in utility shared right of ways where high voltage AC power lines are in proximity.

(TDAC)

Coatings have been used to protect pipeline and other buried assets dating back almost 100 years. Starting with coal-tar enamel and asphalt coatings, early pioneers in our industry set out to extend the life of the thousands of miles of pipeline assets being installed each year. Due to these efforts, some of these pipelines with early coating technologies are still very much in operation today. In fact, these pipelines are not likely a huge risk for AC corrosion.  You may ask, why? Well, let me introduce the pipeline coating protection paradox.

As advancements in coating technologies have improved over the years, manufacturing defects and damage during installation have declined. This means fewer defects will form over the ensuing years of operation. Now while fewer, and smaller defects, seems beneficial, the outcome is often the opposite for pipelines that experience induced AC voltage. Now, when AC current is able to leave the pipeline through a holiday (at a crack or pinhole in the coating) a high concentration of current density will occur at that location.

Essentially, pipeline coatings have been a huge help in reducing the risk of corrosion across the majority of pipeline assets for DC electrochemical corrosion. However, at locations where AC interference is acute, coatings have in fact concentrated the load of corrosive AC potential at increasingly smaller areas, meaning AC corrosion can occur at a very rapid pace.

So with this now being a known challenge, you’re probably asking yourself if the industry is acting on it. The answer is yes…

(TDAC)

In 2018, the National Association of Corrosion Engineers (NACE) introduced new guidelines and procedures to guide risk assessment, mitigation and monitoring of corrosion on cathodically protected pipelines that are in proximity to high voltage AC power lines. The standard is titled NACE SP21424-2018 Alternating Current Corrosion on Cathodically Protected Pipelines: Risk Assessment, Mitigation, and Monitoring, and it complements previous standards.

Two distinct methods are outlined with respect to conducting a monitoring program that can help you measure the performance of your system. One involves electrical resistance probes, which seeks to measure the corrosion rate of the mitigated environment directly. The other, involves the use of an AC coupon to monitor the time weighted average of AC current densities, with respect to specified thresholds. I’ll cover this topic, and the technologies available to effectively monitor these parameters, in more detail later in the webinar.

Well that should be enough to set up the topic, Will.

(WM)

Great Tony, thanks. Phil, now that we’ve a pretty good understanding of the problem, can you walk us through best practices to mitigate AC corrosion risks?

(PE)

Thanks Will – I am going to go into some background on how AC interference on a pipeline is mitigated.  In order to explain the example scenario, let’s assume the following for our pipeline situation.   We have a buried pipeline segment, with a Fusion Bonded Epoxy coating that is receiving cathodic protection from an impressed current system as shown.  The anode groundbed in this scenario is protecting any coating holidays on the pipeline segment. There is a rectifier present to drive the CP current through the anodes to provide the protection to the pipeline.   We are running along smoothly with good cathodic protection levels on the pipeline.

(PE)

Now let’s assume that a power company has decided to build a new overhead AC system in the same pipeline corridor.  Unfortunately, we are now seeing some unwanted AC voltage readings on our pipeline which is due to induced AC interference, the phenomenon described earlier by Tony.    There are now potential issues with the AC current on the line causing a reduced effect of the CP.  This can be a potential issue if the CP current densities are increased too high in order to combat the interference from the AC systems.  The pipeline company undergoes a study to determine what type of AC mitigation is needed to address the induced AC.

(PE)

Based on the results of the AC mitigation study, it was determined that the installation of a grounding system will give the induced AC a path to ground.  However, a decision has to be made on the materials and methods of installing this grounding wire.   The pipeline company evaluates some of the standard options such as:  adding anodes to bleed off the AC, installing point grounds to give the AC a path back to the AC system or installing parallel grounding wire alongside the pipeline.   They chose to install the parallel wire as it has a good history of providing a low-resistance path for a long length of the pipeline, while offering easy installation.

A decision needs to be made on how to attach the grounding wires to the pipeline.  They can be directly connected if the chosen grounding material is anodic to the pipeline or they can be decoupled from the pipeline with a DC decoupler if the material is cathodic to the pipeline.   If the grounding wire is not decoupled, it will be in the same DC circuit as the CP system, and the anodes will end up providing protection to the pipeline and the grounding wire.

(PE)

With the decoupler in place between the pipeline and the grounding wire, the CP DC current remains on the pipeline while the AC current induced on the pipeline is safely passed to the grounding wire.  This helps maintain the efficiency of the CP system by keeping the rectifier outputs low to protect just the intended asset – the pipeline.  The decoupler also provides a safe path to ground for AC Faults and Lightning, otherwise known as conductive coupling.

Now that we have the pipeline example explained, let’s give additional insight into the AC mitigation remediation process….

(PE)

There are two goals in the remediation of AC Voltages on a pipeline system.  The first goal is to provide personnel safety protection by reducing the touch and step voltages to within safe limits.   This limit is generally accepted to be 15 Volts AC as published in NACE SP0177-2019.   These types of situations can be found at pipeline test stations or at above grade pipeline features such as valves, regulator runs or pig traps.  These voltages should be monitored during annual surveys and remediated as necessary.  Options for remediation are pipeline AC mitigation designs that reduce overall pipe AC potentials below the limits, installing dead-front test stations that keep wire connections covered and installing gradient control mats around these facilities to reduce the touch and step voltage potential differences.  These facilities also reduce the risk of shock during AC faults or lightning events.   Gradient control mats are typically decoupled from the pipeline in order to extend the life of the mat so it does not become an anode for the pipeline CP system or to decouple a copper mat system from the pipeline for DC isolation.

The second reason for reducing AC Voltages is to lower the AC current density at coating defects and thereby reducing AC corrosion on the pipeline.   This is accomplished by designing, installing and monitoring an AC mitigation system such as a linear or point ground grounding wires.  The design for the AC mitigation system should take into account the existing parameters of the AC power lines, the pipeline and the soils.  The limits for the design should be based on AC current density at the pipeline coating defects.   As stated in the recently published NACE SP21424-2018, the recommended limit is 30 A/m2 if your DC current density is above 1 A/m2.   This standard also allows you to have an AC current density of up to 100 A/m2 if your DC current densities are kept below 1 A/m2.  It should also be noted that these current densities should be uniform across the pipe.

Next we will explore the process in performing the AC mitigation design.

(PE)

The AC mitigation design phase has three areas to discuss – the modelling inputs, modelling and mitigation strategies and the mitigation design layout.

First, in order to perform an analysis of the given situation, the following inputs are needed –

  1. The Pipe Characteristics need to be determined such as pipe diameter, coating type, Coating Thickness, pipe depth, and construction method particularly any locations of any Horizontal Directional Drilled (or HDD) segments.
  2. AC Power Line information is needed starting with the AC system information of Voltages, line current, fault current, and forecasts for future loading. Also, the physical information of the power system needs to be determined such as wire size, wire configuration, shield wire information, phase transposition locations, substation locations, tower locations.
  3. Soils resistivity information needs to be gathered in order to determine the areas along the pipeline route that are more susceptible to AC corrosion. Typically lower soil resistivity soils like clay or wet-swampy areas are of most interest.  The soils information should be gathered for the entire length of the study area, including readings at these known wet areas.
  4. The overall geometry of the pipeline and AC power system in the right-of-way are needed to bring the model as close to actual conditions as possible. In particular, areas where the pipeline is making divergences from the tower line or where the pipeline is in close proximity to the AC tower foundations.

Second, the modelling and mitigation strategies can begin once the pipeline, AC power information and soils are known.  The modelling should give anticipated results for existing conditions and proposed mitigation scenarios that meet the criteria established by the client and design firm.  The modelling can produce multiple scenarios that aim to bring the voltage and current density profiles down to acceptable levels.  There are potential areas of the system that may need special design attention such as horizontal directional drill areas, pipeline routes near substations or wetland areas with access restrictions.

The mitigation design can then be compared to field conditions to evaluate the options taking into account road crossings, wetlands, and other obstacles that need to be coordinated with.   The design should also be coordinated with the CP design so that test stations and monitoring locations are well coordinated.

(PE)

The components of the AC Mitigation design included the following:

  1. A grounding wire system – these can be parallel wires, zinc or copper, or point grounds utilizing these same wires or other metallic grounds.
  2. There are decouplers to isolate the grounding system from the CP system,
  3. there are test stations to monitor the pipeline DC and AC parameters,
  4. there are coupons to mimic the pipeline surface and give correlation to the densities that are being sought out with the AC mitigation design.
  5. And there are monitoring systems to gather data and help evaluate these paramaters.

(PE)

The decoupler is a device that acts as an open switch for low voltage DC and a closed switch for AC and higher voltages.   The device has a predetermined range of voltages that it blocks DC.  If an abnormal event occurs where these ranges are exceeded, the unit conducts to ground, but returns to normal DC isolation when the event passes.  These systems have a very low impedence, or resistance to AC current flow.

(PE)

The two models that are offered by Dairyland are the SSD and the PCR.  These devices can help you maintain the efficiency of your CP system while making the pipeline safe from AC Voltages and AC Current Density issues.   A key feature of these devices is that they give the pipeline an effective path to ground and operate in a fail-safe mode for personnel protection.

(PE)

As a new development in the decoupler arena, Dairyland has recently introduced the PCRX – a decoupling device that eliminates the capacitance effect that is sometimes found on decouplers.   This new product offering has the ability to eliminate the capacitance effect while still maintaining safe levels of AC on the pipeline.  Close Interval Surveys (or CIS) will now be able to be done without the delays associated with long off cycles or decoupler isolation.   The CIS On-Off profile with a PCRX is very similar to the profiles as if there were no decouplers present.

… Well I hope that provides a pretty good explanation on mitigation strategies and technologies for AC interference. Now over to Tony to discuss the next section of the webinar.

(TDAC)

Great, thanks Phil. So let’s now transition into how remote monitoring can improve these AC mitigation strategies.

(TDAC)

Corrosion engineers must take steps early in the design stage to measure and understand the potential risk of induced AC voltage to proposed new pipelines, or on older pipelines that will experience right of way encroachment by a new HVAC line. The current load carried by HVAC lines can fluctuate considerably throughout any given day due to the dynamic nature of electricity consumption in the communities they serve. Oftentimes, it is very challenging, if not impossible, to extract the necessary information from the electrical utility. Therefore, for engineers to gain a comprehensive understanding of the baseline, peaks, valleys, and cycles of the AC waveform, these measurements should be collected at per minute or per hour intervals.  A robust data logger designed for cathodic protection measurements is essential for this task.  As the design has been finalized and construction begins, pipeline operators can re-deploy the data loggers to verify that the AC mitigation system is effective at reducing corrosion risk.

Once the pipeline is commissioned, operators will be required to collect data to ensure that the mitigation measures remain effective, and that AC corrosion levels remain at a rate that is acceptable for compliance, public safety, and long-term performance of the asset. The readings frequency for these permanent monitoring solutions is typically measured in hours, days, and months. At this frequency, operators can leverage CP monitoring devices that are permanently installed at test stations to monitor current density at coupons and mitigation current flow through PCRs. Battery powered and leveraging satellite and cellular communications, these devices ensure autonomous data collection via a reliable and cost effective platform.

(TDAC)

As I mentioned during the review of the recent NACE specifications, one of the methods used to achieve AC corrosion control is monitoring and controlling the time-weighted average AC current density to within specified thresholds.  The way we do this in practice is by introducing a ‘coupon’ into the system so that we can measure the current density. A coupon is representative of a holiday in the pipeline with a fixed exposed surface area and ideally made of the same material used to fabricate the pipeline. This coupon is buried next to the pipeline and electrically connected through a wire to the pipeline.  With a standard exposed area of 1cm2, the coupon can be used to measure critical parameters related to induced AC levels and electrochemical interactions with the surrounding environment, by experiencing the exact same conditions that would occur on any potential holiday in the vicinity.

Looking again at the guidelines of the recent NACE specification, we can start to see how the coupon plays a vital role in monitoring that AC interference is effectively mitigated.

The standard indicates that the AC current density should be varied depending on the DC current density produced by the CP system, which Phil mentioned earlier. Therefore, in monitoring the AC and DC current density over time, one can ensure that the compliance thresholds are met, or if not, that additional mitigative measures need to be introduced at that specific location.

(TDAC)

AC mitigation systems are best implemented by leveraging a data-driven design, development, and compliance approach.  Each stage or component of an AC mitigation strategy may require a different profile of data to meet its needs; from frequency of the reading measurement, type of parameter, to frequency of transmission. Applications that require a frequent reading, typically with intervals between readings of 1 minute or less, we classify as fast sample rates.

Corrosion engineers collecting fast sample rate data in AC mitigation applications will most often deploy a data logger onto a CP coupon.  Engineers can place a series of data loggers in the right of way to gather information about the induced potential from the power system over a period of time. The data can then be retrieved and, analyzed, providing key insights that will inform, and ultimately be incorporated, into the design of an optimized AC mitigation system.

(TDAC)

Let’s move now to post-construction and beyond data collection. Once the operator has moved into the longer-term monitoring phase, full operations, the frequency at which data is collected will shift from a fast sample rate towards a less frequent rate. This is often because, quite frankly, site conditions don’t change at a rate of 1s, but more on an hourly or even daily timeframe.

To ensure that parameters related to AC interference are within the appropriate limits, the most efficient and cost-effective way to measure and monitor these parameters is to install a remote monitoring device at the coupon test station location. This equipment can reliably measure and transmit critical parameters related to induced AC voltage and electrochemical interactions with the surrounding environment.

Devices such as the Mobiltex CorTalk RMU1 provide pipeline operators with powerful capabilities to remotely monitor AC coupons and reference electrodes in assets that are at high risk of AC corrosion. The device provides multiple analog measurement channels and can accurately capture all required AC and DC parameters simultaneously, eliminating the need for technicians to perform manual measurements. Immediate benefits include the reduction of windshield time for technicians and corrosion specialists to retrieve this data.  Also, the improvement in data quality, quantity, and ease of analysis is seen as an increasingly important driver behind leading corrosion monitoring programs.

(TDAC)

Here you have the RMU1 product zoomed in much closer. The generation 4 RMU1, released in March of this year, expanded the RMU1’s capabilities with two-way communications. Best in class in terms of measurement channels offered, the RMU1 is truly an electronics marvel in terms of the versatility of configurable settings, and flexibility of applications that it can be applied to. As I’ve already mentioned, the RMU1 is a perfect tool for ensuring compliance to NACE standards for AC interference.

Some of our customers leverage a very interesting feature on the RMU1, called the AC Peak Detector Mode, which represents the AC peak current density detector on the RMU1. When enabled, the RMU1 will, while sleeping, sample the coupon current density at set intervals of approximately 20s and trigger a unit wake-up and full measurement cycle if the sampled AC current density value is above the associated measurement high limit (which must be set for operation). If activated, short AC transients (typically less than <30s) can be captured by the RMU1 and exception messages will be sent to CorView, Mobiltex’s cloud-based data platform that our customers use to manage their remote devices, perform analysis, and meet compliance needs. When the signal again drops below the threshold value, the RMU1 will send a clear exception to CorView.

(TDAC)

In this example, you see a representation of real data collected over one week, from September 14 through September 21st. This data is taken at hourly reading intervals, with the RMU1 configured in the AC Peak Detector Mode. A diurnal waveform is evident in the observed data set, with each day’s peak AC Current Density occurring during mid-morning and early evening, when most households and industry are getting going on the day’s tasks. As demand on the utility electrical grid drops as dinner is wrapped up and bedtime reading lights are turned off, the amount of induced AC on the pipeline will subsequently drop, and this is reflected in the AC current density that is measured by the RMU1. In this example, all AC current density readings fell within the pre-established limit settings, and no alarms were triggered in CorView.

(TDAC)

Now we zoom back out to the site schematic and look at another application that is quite common for AC mitigation systems. Phil gave a great explanation of how a PCR acts as a decoupler between the pipeline and ground, bleeding off induced AC and providing protection against faults and lighting strikes. The RMU1 device, represented here still monitoring the AC coupon for compliance purposes, can also be used to monitor the AC mitigation current between the pipeline and the PCR. This measurement helps operators know if the mitigation strategy is as effective in practice as it is on paper, while collecting additional information that can be used to reinforce the value of their mitigation system for proving adequate protection for compliance purposes.

(TDAC)

The other methodology to understand and measure the corrosion rate within an AC interference environment is by utilizing a weight-loss coupon, an electrical resistance probe, or another metal loss inspection tool. Where a corrosion rate of less than 1 mil per year is observed, it can be reasonably stated that the AC corrosion risk is minimal.  However, this type of measurement takes time to observe, which if it turns out after measurement that the corrosion rate was higher than expected, especially with long interval sampling, a significant amount of metal loss may have already occurred at the holiday locations.

Mobiltex developed the RMU1-ER to help solve the manual nature of monitoring these types of sensors. The RMU1-ER provides three analog channels to monitoring metal loss, AC, and DC potentials. The device is virtually agnostic to the type and brand of ER probe that is preferred by the operator, and like all of our devices, user-configured limits enable automated alarms if a measured corrosion rate exceeds the defined limit setting.

(TDAC)

Our core offering of autonomous remote monitoring devices rely on our ability to transmit recorded data from the field. In fact, the backbone of a strong IoT system is in how the devices transmit data, and how that data is stored, accessed, and visualized.

Our remote monitoring units leverage cellular and satellite networks to provide connectivity from the field device to the cloud. With access to RMU and CP asset data, our CorView data platform allows operators to use communications technologies in a flexible manner, choosing whichever technology is best suited for the unique location.

(TDAC)

As we continue to work on new product innovations here at Mobiltex, we are keenly aware that data access, visualization and analysis is important, if not vital, to our customers operations. As such, we are underway with some exciting new projects to redesign CorView. The first phase of work involves CorView being migrated to a commercial cloud-hosted solution.  Shortly after that, we will introduce new application programming interfaces, or APIs, that will enable our customers to extract data in real time from CorView for use in their own systems. The third phase, and one we are most excited about, will take us into the exciting realm of artificial intelligence and machine learning.  With targeted algorithms, we hope to let the users focus on other tasks to ensure asset integrity while our analytical solutions help make sense of all this data that is being accumulated.  That is our vision for CorView AI.

Will?

(WM)

Great Tony.

Let’s take a look at an example of how a shared customer is using both Dairyland and Mobiltex products as part of an industry leading AC mitigation program.

(WM)

Our shared customer is responsible for natural gas distribution for one of the largest cities in the mid-Atlantic region of the U.S. In this first photo, you gain a very quick understanding of the proximity of both pipeline and HVAC assets. Note the Dairyland PCR next to the CP test station.

(WM)

Now, a different site. In this photo you can see a Dairyland SSD mounted onto the CP test station. The test station itself is installed with multiple riser rings, just below the cap. This is a great indication that the cap houses a Mobiltex RMU1 underneath. In this case, the RMU1 is helping to monitor the current density on a CP coupon, DC drain amps off of the SSD, and pipe-to-soil voltage which provides both ON and instant-OFF potentials when the coupon is remotely disconnected.

(WM)

Here is an illustration of the data from this RMU1. Look familiar? On this chart, we’ve graphed AC current density and pipe-to-soil OFF potential over time, and the result is indicative of the diurnal pattern in terms of influence from the fluctuating loads on the HVAC lines. Both measurements are helpful for ensuring protection of the pipeline and for meeting compliance requirements with NACE standards and the local regulator.

Well I hope that this example, especially the site photos, has helped to bring all of this together for you. Now a quick wrap and onto questions.

(WM)

Mobiltex offers best-in-class remote monitoring and field-survey products for the cathodic protection and pipeline integrity industries, spanning oil & gas, water, power generation, and civil infrastructure sectors. Our products are depended on by many of the largest pipeline operators and distribution utilities in North America and around the world. We design, manufacture, and assemble our products in our Calgary office, in the same building that houses our world-class finance and accounting, engineering and production, customer service, sales, and marketing teams.

(WM)

You can work with Mobiltex through our fantastic sales representatives located across North America and with our valued distribution partners, some of which are shown on the screen now.

Phil?

(PE)

Thanks for the opportunity to present more information on AC interference and the Dairyland options available to you for DC decoupling.  Dairyland offers a wide variety of products for both DC decoupling for AC mitigation but also for over-voltage protection at insulating joints.   We also offer a lot of solutions to keep these devices mounted in the optimum position including flange mounting kits, switches and mounting pedestals.   To summarize the Dairyland features and benefits – the design is fail-safe meaning personnel protection will always be in place, the devices are maintenance free requiring no periodic visits to confirm functionality, they have rugged performance with a very low failure rate of 0.001 percent (that is 1 in 100,000).  Dairyland also certifies their devices to UL standards and other national standards.  Dairyland is an ISO certified company to ensure our manufacturing processes are robust and with consistent quality.   In addition, we offer reliable service and support to help you answer your application questions.

Questions?

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