flow controller Articles
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Rotork, Redefining Flow Control
In 2010, when the well known international actuator manufacturer Rotork had its last cover story in Valve World magazine, the focus was on the company’s German office in Melle and the plans and developments for that location. In Rotork’s 2012 cover story, we shifted the focus to the Head Office in Bath, UK, and spoke to Mr. Richard Hudd, Marketing Director for Rotork Fluid Systems, ...
By Rotork plc
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Environics - Full-scale error vs. Setpoint error
A flow controller's accuracy is typically expressed as a percent of Full-Scale flow (%FS). This means that the flow controller is most accurate when operating at its rated full-scale flow rate. This also means that its accuracy, expressed as a percent of Setpoint, drops off significantly when operating at lower flow rates. For example, a 1000 cc/min flow controller with a +/- 1%FS accuracy, ...
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Rotork in Bath
Since the time of the Romans, flow control has played an important role in the culture of Bath and been a major contributor to the prosperity of the ...
By Rotork plc
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Reliable Flow Control for Mainstream and Ancillary Offshore Applications
Rotork flow control products are used on oil and gas applications throughout virtually all upstream, midstream and downstream activities, ranging from offshore production facilities through refining and processing to transportation of finished products via pipelines or vessels. They deliver reliable and accurate performance, operating valves and controlling the flow in every area, often at high ...
By Rotork plc
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Exergy and irreversible entropy production thermodynamic concepts for nonlinear control design
This paper develops a novel nonlinear control system design methodology that uniquely combines: concepts from exergy and entropy; Hamiltonian systems; Lyapunov's direct method and optimal analysis; and power flow control analysis. Relationships are derived between exergy/entropy and Lyapunov optimal functions for Hamiltonian systems based on the recognition that the Hamiltonian is stored exergy. ...
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Innovation through synergy
As a specialist manufacturer of products for flow control, pressure control, flow measurement and pressure measurement serving diverse duties and a wide variety of applications, Rotork Instruments delivers solutions that are trusted wherever there is a need for high precision and ...
By Rotork plc
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A sensitivity-based approach for optimal location of multi-converter unified power flow controller considering its impact on generation and wheeling costs
The optimal location of Flexible AC Transmission Systems (FACTS) controllers is important due to their high cost. When a FACTS controller uses some converters, its cost becomes very high. A multi-converter unified power flow controller, also known as Generalised Unified Power Flow Controller (GUPFC) can effectively control the power system parameters such as bus voltage and real and reactive ...
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Biomedical research looks to thermal mass flow controllers
Precision control in biomedical research is critical for the success of any experiment. This is especially true for gas mixing and blending applications. These gas mixing applications often involve the creation of artificial atmospheres or other gas mixtures. To get statistically sound results, scientists must achieve precision flow control in creating these mixtures for sensitive experiments. In ...
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PSO embedded online adaptive self-tuning UPFC shunt converter control
The dynamic performance of a power system can be improved by using additional signals in a unified power flow controller (UPFC) circuits. Self-tuning adaptive control of phase angle of shunt converter for stabilisation is considered in this article. From the input-output data record, a linear plant model of the UPFC is identified through a least square regressive algorithm. Stabilising control is ...
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Thermal spray gas flow control
How to Achieve a Consistent Flame and Avoid Problems High Velocity Oxygen Fuel (HVOF) thermal spray technology has evolved and advanced recently through the use of more sophisticated controls and design. In particular, the ignition and control of the flame has benefited from the use of actively controlled flow rates which deliver steady, consistent, and programmable flame characteristics and gas ...
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Rotork Instruments announces new products and services
As a specialist manufacturer of products for flow control, pressure control, flow measurement and pressure measurement serving diverse duties and a wide variety of applications, Rotork Instruments delivers solutions that are trusted wherever there is a need for high precision and reliability. Process and plant engineering is an important industry sector served by the market-leading companies that ...
By Rotork plc
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An integrated H-infinity optimised fuzzy controller for UPFC in multimachine power systems
A detailed mathematical model of a multimachine power system with unified power flow controller (UPFC) has been developed with a view to control the active and reactive power flow in the transmission line and to improve transient stability performance. Thus, initial voltage and angles of the series and shunt voltage sources are computed and used during transient stability studies. After the power ...
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The Unified Power Flow Controller in the voltage stability problem
The overall objective of the paper is to show that the Unified Power Flow Controller (UPFC) is capable of solving the voltage stability problem provided that its converter power ratings are sufficiently sized. If initiated in time, the UPFC is able to simultaneously support voltages and redirect power flows, thereby helping the system avoid the voltage collapse driven by a composite load recovery ...
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Minute Flow Tip! Don’t Settle for “Good Enough
The capillary thermal technology used in every SmartTrak mass flow controller measures flow directly, at the molecular level. In essence, counting and controlling every gas molecule flowing through the instrument to achieve unmatched precision. Unaffected by upstream gas temperature and pressure fluctuations, gas mass flow control is direct and ...
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Subsea valve actuation – reliability in depth
Subsea valve actuation is an important part of Rotork’s flow control activity. With an installed base dating from the early 1990s, operating at depths down to 2500 metres, Rotork Fluid Systems is familiar with supplying hydraulic actuator products to meet stringent subsea ...
By Rotork plc
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OPF with FACTS devices in interconnected power systems using fuzzy stochastic algorithms
This paper presents two new computationally efficient improved stochastic algorithms for solving optimal power flow (OPF) in interconnected power systems with FACTS devices. These algorithms are based on the combined application of fuzzy logic strategy incorporated in both evolutionary programming (EP) and tabu search (TS) algorithms, hence named as fuzzy mutated evolutionary programming (FMEP) ...
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The ‘Swiss Army Knife’ of Mass Flow Controllers
Did you ever wish your mass flow controller could do it all? You’re not alone. End users ranging from machine builders to laboratory researchers are often faced with the challenge of needing flow measurement and control equipment for a wide variety of applications. Many customers call the SmartTrak 100 mass flow controller the “Swiss Army knife” of MFC’s. Finding a mass ...
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A power-flow control method for hybrid active front-end converters
The hybrid active front-end converter, which is composed of a capacitor and a voltage source converter in series connection, has been presented recently. Compared with grid-connected converter, the hybrid converter could be operated with reduced dc voltage as well as small-sized passive filters due to series-connected capacitor. This paper presents a power flow control method for a hybrid active ...
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Transient stability and power flow model of the unified power flow controller for various control strategies
This paper describes and validates transient stability and power flow model of a Unified Power Flow Controller (UPFC), and presents a detailed comparison of different controls strategies, proposing novel, efficient, and simple controls for this controller. The proposed model accurately represents the behaviour of the controller in quasi-steady state operating conditions, and hence is adequate for ...
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Sierra helps Biotech firm build their Competitive edge - Case Study
Challenged by their outdated gas mixing systems, budgetary constraints and a turbulent economy, a leading US biotech firm, who depends on precision gas mixing and blending to maintain synthetic air environments for research, sought out Sierra to help streamline and improve their processes and cut costs. Sierra engineers identified current system weak points and recommended the new Sierra ...
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