Monday, July 22, 2019

Protecting Drinking Water Pipelines with Inflow Prevention

Protecting Drinking Water Pipelines with Inflow PreventionProtecting Drinking Water Pipelines with Inflow Prevention was written to assist water distribution system design engineers in reducing the risk to public health from contaminated drinking water by understanding the use of inflow preventer assemblies in water distribution systems.

This paper is not intended to provide all of the information necessary for specifying these devices, but rather to explain their function and performance criteria along with common engineering parameters associated with the application of air valves and cross connection control devices. Successful system design should consider the functions of the air valves and vents together with the need to protect the system from contamination and loss of efficiency.

With this knowledge, the design engineer can better apply American Water Works Standard C514 and American Society of Sanitary Engineering (ASSE) Standard 1063 Inflow Preventers and understand the application, sizing, installation guidelines and code applications that affect their use. The rating information provided is based on generally accepted products and standards which offer valuable information for predicting performance.



For more information about the proper application of pressure instrumentation, contact Automatic Controls of VA by visiting https://acva.com or by calling (804) 752-1000.

Sunday, June 30, 2019

US Power Grids, Oil and Gas Industries, and Risk of Hacking


A report released in June, from the security firm Dragos, describes a worrisome development by a hacker group named, “Xenotime” and at least two dangerous oil and gas intrusions and ongoing reconnaissance on United States power grids.

Multiple ICS (Industrial Control Sectors) sectors now face the XENOTIME threat; this means individual verticals – such as oil and gas, manufacturing, or electric – cannot ignore threats to other ICS entities because they are not specifically targeted.

The Dragos researchers have termed this threat proliferation as the world’s most dangerous cyberthreat since an event in 2017 where Xenotime had caused a serious operational outage at a crucial site in the Middle East. 

The fact that concerns cybersecurity experts the most is that this hacking attack was a malware that chose to target the facility safety processes (SIS – safety instrumentation system).

For example, when temperatures in a reactor increase to an unsafe level, an SIS will automatically start a cooling process or immediately close a valve to prevent a safety accident. The SIS safety stems are both hardware and software that combine to protect facilities from life threatening accidents.

At this point, no one is sure who is behind Xenotime. Russia has been connected to one of the critical infrastructure attacks in the Ukraine.  That attack was viewed to be the first hacker related power grid outage.

This is a “Cause for Concern” post that was published by Dragos on June 14, 2019

“While none of the electric utility targeting events has resulted in a known, successful intrusion into victim organizations to date, the persistent attempts, and expansion in scope is cause for definite concern. XENOTIME has successfully compromised several oil and gas environments which demonstrates its ability to do so in other verticals. Specifically, XENOTIME remains one of only four threats (along with ELECTRUM, Sandworm, and the entities responsible for Stuxnet) to execute a deliberate disruptive or destructive attack.

XENOTIME is the only known entity to specifically target safety instrumented systems (SIS) for disruptive or destructive purposes. Electric utility environments are significantly different from oil and gas operations in several aspects, but electric operations still have safety and protection equipment that could be targeted with similar tradecraft. XENOTIME expressing consistent, direct interest in electric utility operations is a cause for deep concern given this adversary’s willingness to compromise process safety – and thus integrity – to fulfill its mission.

XENOTIME’s expansion to another industry vertical is emblematic of an increasingly hostile industrial threat landscape. Most observed XENOTIME activity focuses on initial information gathering and access operations necessary for follow-on ICS intrusion operations. As seen in long-running state-sponsored intrusions into US, UK, and other electric infrastructure, entities are increasingly interested in the fundamentals of ICS operations and displaying all the hallmarks associated with information and access acquisition necessary to conduct future attacks. While Dragos sees no evidence at this time indicating that XENOTIME (or any other activity group, such as ELECTRUM or ALLANITE) is capable of executing a prolonged disruptive or destructive event on electric utility operations, observed activity strongly signals adversary interest in meeting the prerequisites for doing so.”

Tuesday, June 25, 2019

Setting the Studs and Nuts Before Mounting a Waterman Fabricated Slide Gate


This video covers how to set up the studs and nuts before mounting a Waterman fabricated sliding gate valve, and also how to adjust the cross rail to ensure there are no gaps between the seat and the slide plate.

INSTRUCTIONS

The first thing you want to do is refer to your submittal drawing to make sure that the studs are exposed to proper length.  Align each nut on the corners, so that your gate is perfectly plumb.  Go from side to side, and corner to corner, aligning the nuts with the straight edge. 

After you have the gate mounted, you'll work with a cross rail seal.  Start with the two middle nuts, and alternate one and another, working your way out to the edge of the gate as shown of the Waterman installation manual for fabricated slide gates. Using a 0.004 feeler gauge, check the cross rail seal between the slide and the seal to ensure that it does not pass through. If you do have a place where it crosses through, you need to loosen the front nut and tighten up the back nut, bringing the frame of the gate closer to the slide and decreasing the leakage path.  

Go back through the gate installation and make sure all your bolts are very tight, and that you don't have any leakage pass across the top seal. It's the most critical part of your installation - making sure that the cross seal doesn't have any leaks.  

ABOUT WATERMAN

Waterman takes pride in their industry-leading technical capabilities and experience. Their engineering knowledge allows them to tackle any project, and they welcome all opportunities to create custom design products for any water control application.

For more information about water control products for water treatment, wastewater, high-volume agricultural and rural surface water delivery, hydro-power, and flood control management, contact Automatic Controls of Virginia. They can be reached by calling (804) 752-1000 of by visiting their website at https://acva.com.

Wednesday, June 5, 2019

Level Measurement Using Guided Wave Radar

Guided Wave Radar Level Transmitter
Guided wave radar transmitter
mounted in bypass chamber with
magnetic level gauge.
(Questtec Solutions)
Guided wave radar transmitters are widely used across different industries. These devices with their simple installation and trouble-free operations help industrial companies save time and money. They are ideal for a large number of process applications ranging from simple to complex.

How Do Guided Wave Radar Transmitters Work?


Guided wave radar transmitters rely on microwave pulses. Since microwaves are not affected by dust, pressure, temperature variations, and viscosity, this type of transmitter produces highly accurate results.

A low-energy microwave pulse is sent down a probe, and a part of it is reflected back when the pulse hits the process media. The liquid level is directly proportional to the time-domain reflectometry. The time when the pulse is launched and received back is measured to determine the distance from the surface of the media.

Types of Guided Wave Radar Level Transmitters


Guided wave radar level transmitters are available in different probe configurations. Selecting the right probe is important for successful implementation of the device. While manufacturers offer a range of guided wave radars, most are derived from the three basic probe configurations: single element, twin element, and coaxial.

  • Single element probe — The single element probe is the most widely used and least efficient device. The device is popular since it is more resistant to the coating of the liquid.
  • Twin element probe — The twin element probe is a good, general purpose probe that is generally used in long-range applications. They are ideal in situations where flexible probes are important for successful reading.
  • Coaxial probe — The coaxial probe configuration is the most efficient guided wave radar level transmitters. The probes are used in more challenging low-dielectric applications.

Benefits of Guided Wave Radar Level Transmitters


Guided Wave Radar Level transmitters provide a range of benefits in different applications. The concentration of the measuring signal is strong and clean. This is due to the narrow path of the signal propagation that reduces the chances of impact by stray signals due to obstacles or construction elements inside the tank.

Another benefit of guided wave radar level transmitters is that they are easy to install. No mounting holes are required to install the device. This results in cost savings for the organization. The waveguide can be formed to follow the tank’s contours or mounted at an angle.

The device is ideal in situations where an interface measurement is required. The measuring signals can penetrate the medium deeply, resulting in more accurate results. The waveguide technology is suitable for applications where the medium is subjected to heavy vapors, foam, and dust.

Guided Wave instruments can detect changes in dielectric consents on the boundary of a property. The device can be configured to detect level at both the top and the bottom of a layer of emulsion.

Industrial Application of Guided Wave Radar


Guided wave radar level transmitters are increasingly being used in process industries. The sensors are used in situations that previously employed ultrasonic, hydrostatics, and capacitance. The accuracy specification of the basic model range is up to ±5mm, while the accuracy of the advanced models is up to ±2mm.

The device is generally used in industries to take level readings. The readings are used for local indication and visualization in control systems.

Moreover, guided wave radar level transmitters are also used for managing liquid inventory, determining safety limits, dry run protection, and leak detection. Other applications of guided wave radar level transmitters include communicating low limits to suppliers, automated ordering systems, and streamlining the logistics process.

Guided radar level measurement is also suitable for bulk solids. The surface type is not restricted to liquids since the reflected waves are guided easily through any medium. Foam formation and turbulent liquid surfaces and different angled surfaces (as is the case with bulk solids) don’t influence the accuracy of the reading.

Selection of Guided Wave Radar Level Transmitters


Selection of guided wave radar level transmitters should be based on the requirements of the task. Generally, the rigid single element probe configuration is ideal for angled installations for flowing liquids. The dual flexible wire probe is suitable for most other common applications.

A coaxial probe configuration is recommended for liquids that are cleaner with low dielectric constant and with turbulence on the product’s surface. This type of guided wave radar device is also recommended for installations where the probe is near the tank wall or other obstacles.

Make sure that the device can withstand the range of temperature within the tank. Most GWR devices are rated up to 850 deg F or 450 deg C. You should select a device with added signal strength since this will result in increased reliability and accuracy of the devices.

Guided Wave Radar Level Transmitter
Guided wave radar transmitter.
(Questtec Solutions)
Guided wave radar level transmitter with dynamic vapor compensation is recommended where a high level of accuracy is required under a high-pressure environment. The measurement taken from the device can compensate for changes in vapor dielectric, which results in improved accuracy.

Other factors that should be considered include mounting and proximity. Single probe configuration can be installed almost anywhere. But the single probe configuration can only to apply to specific situations.


Guided Wave radar level transmitters can also be used with an agitator. However, certain things must be considered prior to use the device. The probe must be prevented from contacting the agitator blades. Make sure that you confirm the ability of the probe to withstand the force inside the medium. This is important since turbulent on the surface may decrease the accuracy of the measurement. You can install the device in a bypass chamber or stilling well for an agitated tank. Make sure you speak with an applications expert before specifying or installing a guided wave transmitter. With their consultation, you'll save time as well as improve efficiency and safety.

For more information, contact Automatic Controls of Virginia. Call (804) 752-1000 or visit https://acva.com.

Sunday, May 26, 2019

Emerson Bettis CBB Pneumatic Scotch Yoke Actuators: Key Component sand Features


Bettis CBB-Series actuator represents the latest generation in pneumatic scotch yoke actuators from Emerson. The CBB draws from the best features of earlier versions – CB and CBA. Incorporating cutting edge features provides the CBB with a proven, rugged design that is dependable and reliable in the field. Because it has the same envelope dimensions and mounting interfaces as previous CB versions, the CBB allows for mounting interchangeability.

Compact, lightweight and ideally suited for automating ball, butterfly and non- lubricated plug valves, or any quarter-turn (90 degree) rotating mechanism, the CBB Series is also economical and low maintenance. Available in double-acting and spring- return models and are independently certified to IEC 60529 IP66 and IP67M for water ingress protection.

For more information about Bettis actuators, contact Automatic Controls of Virginia by calling (804) 752-1000 or by visiting https://acva.com.