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Variable Frequency Drives in Electric Actuators

Variable Frequency Drives in Electric Actuators

Electric actuators are vital for operati...

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Industry Headlines

Halliburton and Baker Hughes Abandon Proposed Merger Agreement

4 HOURS AGO  |  Chris Guy

Halliburton and Baker Hughes announced that the companies have terminated the merger agreement they entered into in November 2014, effective April 30, 2...

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Industry Headlines

Garlock Acquires Rubber Fab Technologies

4 HOURS AGO

Garlock has acquired the business and assets of Rubber Fab Gasket & Molding Inc. through its parent company EnPro Industries.

Rubber Fab, headquartered in Sparta, NJ, is a recognized supplier of high performance sanitary gaskets, hoses and fittings for hygienic process industries such as pharmace...

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MRC Global Announces First Quarter 2016 Results

1 DAY AGO

MRC Global Inc. today announced first quarter 2016 results. The company's sales were $783 million for the first quarter of 2016, which were 39% lower than the first quarter of 2015 and 19% lower than the fourth quarter of 2015. As compared to last year, reduced customer activity across all segments ...

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Halliburton and Baker Hughes Abandon Proposed Merger Agreement

4 HOURS AGO

Halliburton and Baker Hughes announced that the companies have terminated the merger agreement they entered into in November 2014, effective April 30, 2016.

“This was an extremely complex, global transaction and, ultimately, a solution could not be found to satisfy the antitrust concerns of regul...

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Energy Sector Weighs on Construction Starts

5 DAYS AGO

At a seasonally adjusted annual rate of $660.5 billion, new construction starts in March receded 1% from February’s pace, according to Dodge Data & Analytics. Total construction starts had jumped 13% in February, led by a huge gain for the electric utility and gas plant category. The dolla...

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U.S. Economy Grew 0.5% in First Quarter

9 HOURS AGO

U.S. GDP increased at an annual rate of 0.5% in the first quarter of 2016, according to the advance estimate released by the Bureau of Economic Analysis. In the fourth quarter, real GDP increased 1.4%.

The increase in real GDP in the first quarter reflected positive contributions from personal consumpt...

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ISM: Manufacturing Activity Increased in April

1 DAY AGO

Manufacturing expanded in April as the PMI registered 50.8%, a decrease of 1% from the March reading of 51.8%, indicating growth in manufacturing for the second consecutive month, following five consecutive months of contraction in manufacturing.

The Institute of Supply Management (ISM) reports that 15...

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Solar-powered Valve Actuation: An Update

vmspr12_solar_actuators

The use of solar power in industrial and municipal valve actuator applications goes back several decades; however, technological advances in solar power efficiency and storage mean that today, it has become a practical, dependable alternative for many isolated locations.

In the early days, solar power was used in noncritical applications that required low power consumption, primarily to supply monitoring of valve-related and process data at remote locations. As solar power technology evolved, applications expanded along with the sophistication of the technology.

Today, the most extensive use of solar power in valve actuator applications is found in remote parts of the world that have vast stretches of jungle, desert or mountainous terrain—environments without reliable utility power. For example, South and Latin American oil-producing nations pioneered extensive use of solar and telemetry mostly for use on critical oil and gas pipelines.

In the U.S., fewer off-grid applications present themselves; however, recently some energy pipelines and governmental water agencies have come to rely on solar even for critical applications. The decision to go with solar in these cases is usually based on the comparative costs of bringing the grid to the job site or keeping the site off the grid. Furthermore, the current boom in unconventional extraction methods for oil and natural gas is driving more interest in solar power for valve-actuator applications.


ENERGY CONSUMPTION

A key factor of whether or not to consider solar power for an application relates to available energy and consumption. Two examples would be a 36-inch valve or gate operating at 1,000 psi on a crude oil pipeline and a 96-inch sluice gate in 25 feet of head water at a remote dam site. The two would require about the same force and amount of energy to operate. In both these cases, users would find bringing utility power to the sites cost prohibitive, which triggers the process to consider solar power.

In these scenarios, the pipeline company needs to be able to close the valve in an emergency in response to environmental and safety concerns. The water utility needs to maintain an appropriate level in its reservoir through the winter, which means changing the outlet gate position as the lake level rises or falls. Both applications need to sense process conditions, transmit information, move a load and do it all off grid. Solar power can be more cost effective in such cases and requires less maintenance than gas or diesel generation systems if the loads can be managed.


vmspr12_andes_solar_actuatorHigh in the Andes Mountains between Argentina and Chile, 14 valve sites are connected by fiber optic cable to the pipeline command center. Solar panels provide power for the station during the summer months and a turbine wind generator takes over during the winter. A control building houses the communication equipment and the hydraulic power unit (lower right). The 16-inch pipeline is buried, but the hydraulic actuator mounted on the valve extension can be seen above grade (lower left).POWER SUPPLY

One of the ways technology has improved in the solar industry is that, in the last 10 years, panels have become much more efficient and reliable. A case in point is an energy company in Wyoming that had a solar panel riddled with bullet holes. In earlier times, that panel would not have functioned. Yet, in this case, they did not need to replace the panel until a significant portion of its surface area was damaged because of the latest generation of solar panels, which employs self-healing technology.

Today, battery racks can be as simple as a pair of marine-grade gel cells wired to deliver 24 volts direct current (VDC), or racks of batteries wired to deliver 48, 96 or 110 VDC. A typical electric motor operator would reach the limits of battery storage and energy transfer capacity very quickly. But if speed is not an issue, then trading horsepower for gear reduction would allow some very large valves and gates to be operated this way.

Most importantly today, however, is that users don’t have to be in the sun-belt to make solar work. Canada has many successful remote solar sites.


HIGH SPEED AND FORCE, CRITICAL CONTROL

High speed, high force and critical control, which are all necessary requirements for dependable valve actuator operation, can be accomplished with an appropriate hydraulic operating system. By combining solar electric battery storage with hydraulic accumulator storage, very high operating forces and flexible speed control are possible. Full pipeline and station diagnostics are available as well.

Only a few years ago, communication options in remote areas were very limited. Satellite receivers were expensive and required a license; cellular towers had not yet spanned the country; and data capacity was limited. Radio systems were complicated and required intensive maintenance. Today, however, wireless technology covers even the most remote parts of the country, and most new pipelines are built with fiber-optics for supervisory control and data acquisition (SCADA) along their full length. This allows the same level of data acquisition and control at remote sites as in a plant connected to the grid, including both power and control redundancies for critical operations.

In addition, significant improvements in energy efficiency of instrumentation have been made, so continuous load on the battery system is minimized.

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