Power Industry Boiler Water Level Measurement Techniques

The March 2017 Inst Measurement and Control Technical Seminar evening will be hosted by Doosan Babcock in Manor Royal, Crawley, on Tuesday 21st March 2017.

This will be a tri-company, collaborative event, presented by Doosan Babcock, and also featuring contributions from Vega and TC-Fluid Control. It is aimed at providing attendees with a useful insight into industrial measurement application challenges in order to further their professional development knowledge.

Drum Level Control

The first presentation by Doosan Babcock will discuss Drum level measurement using DP Measurement and Hydrastep Measurement techniques.

Power station Steam Drum Level measurement is required for drum level control, Burner Management System (BMS) protection and Code compliance. Drum level is both a critical and difficult measurement to make. At steady state conditions, considerable turbulence in the drum can cause the level to fluctuate. A changing rate of water inflow and steam outflow adds to the potential for measurement error. The DP Measurement technique uses the difference in pressure between a head of water in an external reference column and the level in the drum. The density of water and steam vary appreciably with pressure, so the differential pressure obtained at any given level will vary as boiler pressure changes.

The Hydrastep technique detects the conductivity variation between the steam and the water. The electrode principle is an efficient system for measuring drum water levels.

Microwave Technology

Vega will explain how microwave technology can tackle a wide variety of applications associated with steam boilers. Non-contact or guided wave techniques have the ability to measure reliably, even with fluctuating temperatures up to 450C combined with pressures of up to 400 bar. Measurement is virtually unaffected by pressure and temperature changes. Top mounting makes installation and maintenance easy. In many cases microwave transmitters provide an alternative to legacy equipment for both solids and liquids. SIL qualification and boiler approval now enables microwave technology to  be used directly on steam boilers, with special modifications to compensate for saturated steam effects.

Visual/Glass and Boiler Steam Glass level gauges

untitledVisual/Glass and Boiler Steam Glass level gauges are a requirement on steam boilers for visual verification of the level control system, and will be discussed by TC-Fluid Control. Magnetic level gauges have many applications on and around the boiler, providing visual level indication whilst minimising potential leak paths, and can be used as an alternative to one of the glass level gauges on the boiler drum. Simple, robust technology provides a highly visible indication of process level at pressures of up to 400 bar and temperatures up to 450C.

Postscript: Wessex IMC Section meeting

Vega Controls will also give a talk to the IMC Wessex Section meeting on 15th March about the technology behind their 80GHz radar liquid level measurement systems. The talk will include live demonstrations, and takes place at the Forest Lodge Hotel, at Lyndhurst. A video is available that shows their new sensor.

 

Third-generation to lead E+H UK business

The current Managing Director of the Endress+Hauser UK sales centre, David Newell, has announced his retirement after serving the company for thirty years. He will be replaced by Steven Endress, the first third-generation member of the Endress family to take an operational role in the family business. Steven’s father, Hans-Peter Endress, the former Managing Director and current Chairman of Endress+Hauser UK, will relinquish his duties as Chairman but remain on the Group’s Supervisory Board.

 

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David Newell

David Newell, now 65, boasts 42 years of experience in the process automation industry, of which he has dedicated three decades to Endress+Hauser. He will retire on 30 September 2016, satisfied in the knowledge that he leaves Endress+Hauser as one of the leading suppliers for process instrumentation in the UK. He joined Endress+Hauser in 1986, and became Director of Sales in 1997 – then Director of Sales & Marketing in 2002. After being promoted to Deputy General Manager in 2010, he assumed responsibility for the entire operation two years later. David is married with two grown children and the proud grandfather of two grandchildren.

Third generation of the Endress family

Endress_Steven

Steven Endress

The new Managing Director of Endress+Hauser UK, effective 1 October 2016, will be Steven Endress, who is currently Director of Services at the UK sales centre. Prior to joining the company in 2012, he spent ten years in the software development industry. His previous position was Vice President of Sales at AppSense Inc, in Munich, Germany, where he was responsible for the German, Austrian and Swiss markets. Steven holds a degree in business studies and subsequently received an MBA from Lancaster University. Married with two children, the 37-year-old is the eldest son of Chairman Hans-Peter Endress and grandson of the company’s founder, Georg H Endress.

With Steven Endress taking over the management, Hans-Peter Endress (69) will relinquish his duties as Chairman of the Board at Endress+Hauser UK and concentrate on his work with the Supervisory Board of the Endress+Hauser Group.

Happy retirement David!

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Emerson Enardo relief valves get WirelessHART communications

Emerson acquired Enardo, a manufacturer of pressure and vacuum relief valves based in Tulsa, Oklahoma, in late 2013. This week saw the launch of a new wireless enabled version of the Enardo pressure and vacuum relief and safety valve used on storage tanks in the oil and gas, petrochemical and pharmaceutical industries.

Enardo_950_w-bracket

By adding the Smart Wireless monitoring system operating over the Emerson WirelessHART network, the safety valves, normally located on the top of large storage tanks, can easily signal to operators in the control room that they have been triggered to either relieve a pressure or vacuum condition. Such situations can arise as a result of changes in temperature, liquid level, or both, and relief valves are essential to prevent tank over or under-pressure conditions that could lead to structural failure. Enardo pipe-away, vent-to-atmosphere, in-line and end-of-line relief valves are typically installed on storage tanks to control evaporation and fugitive emission losses that result from flammable and hazardous petroleum vapour-producing products. Knowledge of the actuation of such a safety valve enables an immediate response, where needed, to prevent problems which can be related to safety, emissions, and the quality of a tank’s content.

Steve Attri, product manager at Emerson for the Enardo valves, commented: “Until now, PVRVs have remained un-monitored, with none of the feedback loops commonly seen in other pressure control devices. As the tank’s primary pressure control device, this wirelessly-monitored solution can be invaluable.”

Enardo manufactures tank and terminal safety equipment, including hatches, vent, pressure and vacuum relief valves and flame arrestors used in the oil and gas, petrochemical, chemical and other industries. Enardo in-line and stack vent valves have been the oilfield industry standard for more than 80 years.

Prior to the acquisition by Emerson, Enardo had sales of $65m a year, and employed 140 people. It now operates within the Regulator Technologies business, previously known as Fisher Regulators, within Emerson Process Management.

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Krohne liquid level switch for extreme conditions!

Normally electronically-based process sensors have problems when dealing with extremes of hot or cold temperatures, and can suffer if subjected to high pressures. So the Krohne Optiswitch 5300C is maybe the exception that proves the rule, with a temperature capability from -196°C to +450°C, and able to withstand pressures from zero up to 160 barg (this is -321°F to +842°F, and 0-2320psig). Despite the name, the Optiswitch is a vibrating fork liquid level switch, available with wetted parts in Inconel Alloy 718, with parts in 316L or Hastelloy C-22.

Krohne switch

Optiswitch (pictured sideways for convenience)

This new Optiswitch is designed and fully approved for extreme process conditions, for Overfill protection duties and high/low level alarm, and should find application in the chemical and oil & gas industries, marine tankers and steam boilers. It is available with a variable insertion length, up to 3m long (for vertical mounting from the top of a tank or vessel), and can be used in SIL2 applications, or can be built into a SIL3 redundant architecture set-up. It is a new and significant addition to the Krohne Optiswitch range, which includes models suitable for both liquid and solids/powder applications.

Interestingly the output options available include a DPDT relay, PNP/NPN transistor outputs, or a switched 8/16mA current indication. The latter output was introduced on the Mobrey ultrasonic level switches back in the 1980s, because it seemed like a good idea at the time, but was never really taken up.

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Finland LNG terminal automation

Honeywell Process Solutions will provide its Experion Process Knowledge System (PKS) automation controls, with tank gauging systems, to Finland’s first liquefied natural gas (LNG) import terminal. The imported LNG will be used to supply natural gas to marine vessels and industrial facilities in Finland, helping to replace other fuels that have higher emissions.

The cleaner-burning natural gas will help these vessels and facilities meet emissions regulations in the Baltic Sea and Nordic areas. Honeywell technology (including Enraf tank gauging) is currently being used in about 40 similar LNG import and export terminals around the world.

Additionally, Honeywell’s Enterprise Buildings Integrator (EBI) will connect and power comfort, safety and security systems within the terminal itself, creating a productive environment for workers. With tight integration between the Experion PKS and EBI, operators will have one interface to access and manage all process and facility technology, which improves site-wide visibility and efficiency.
“Honeywell’s technologies offer Skangas Oy an all-in-one solution that will help make their new facility be efficient and productive from day one,” said Pieter Krynauw, vp and gm of the Honeywell Process Solutions Projects and Automation Solutions business unit. “This fully integrated technology will help the terminal maximize its operations with accurate and on time information, precise measuring technologies, safety and security.”
This will be the third LNG terminal equipped for Skangas, one of the largest suppliers of small-scale LNG in the Nordic countries. The company operates similar facilities in Sweden and Norway to provide customers with natural gas for shipping, industrial and heavy-duty land transport needs. The Pori LNG terminal will have a capacity of 30,000 cubic meters and will be completed in the second half of 2016. Honeywell’s tank gauging systems will be used on tanks provided through the Spanish engineering company FCC Industrial e Infraestructuras Energeticas S.A.U.
“Demand for LNG in Finland continues to rise for industrial, shipping and heavy-duty land transport companies,” said Tommy Mattila, Sales and Marketing director, Skangas. “It is critical that this terminal operates at the highest level of efficiency.”
Honeywell technologies that will be used at the facility include:
  • Experion® Process Knowledge System (PKS), the heart of the Integrated Control and Safety Systems (ICSS), which offers more than traditional distributed control systems (DCS) by unifying people with process, business requirements and asset management by enabling integration of all process control, safety systems and automation software.
  • Enterprise Buildings Integrator (EBI) is a building management system that provides a single point of access to information and resources that help monitor, control and protect a facility. EBI will connect fire detection, intrusion detection, access control, video surveillance, and heating and cooling equipment at the new Skangas Oy terminal, and seamlessly share data with Experion PKS.
  • Terminal Manager automates all operations at a bulk liquid terminal, including key monitoring and controlling functions such as product receipt, gate access control and loading.
  • Safety Manager integrates process safety data, applications, system diagnostics and critical control strategies, and executes defined safety applications in a fully redundant architecture.
  • SmartRadar FlexLine is one of Honeywell’s portfolio of high-end radar tank gauges for the assessment of tank contents, tank inventory control and tank farm management.
  • Portable Enraf Terminal is a portable device that enables access and reading of Honeywell Enraf tank gauges regardless of weather or operating conditions.

Maintenance-free Non-contacting Bulk Fuel Tank Monitoring

Pulsar Process Measurement have supplied non-contacting ultrasonic volume measurement equipment with associated remote plant mimic software to help solve an issue for Northern Rail at three sites; their Newton Heath LMD (Light Maintenance Depot) near Manchester, Blackpool LMD and Barrow LMD, allowing them to control the ordering, delivery and usage of fuel more efficiently.

Northern Rail’s contractor Austin-Lenika, who were engaged in a wider project on site, had identified that the existing level indicators were not suitable for the application and were, therefore, not reading the level correctly. Austin-Lenika approached Pulsar for a solution. They specified that new equipment should provide a measurement of the volume of fuel in the bulk tanks with a target of ±1% accuracy, allowing staff on site to monitor fuel usage and transfer and pinpoint the optimum time to re-order fuel. They also wanted to have both local display of level on the storage tanks and to be able to remotely monitor levels across the entire tank farm of eight fuel vessels, plus three additional bulk tanks.

Pulsar supplied Ultra 3 non-contacting ultrasonic level measurement controllers with associated dB series transducers. The transducers were mounted into flanges at the top of the fuel tanks, and operate on a ‘time of flight’ principle, an ultrasonic signal reflecting back to the transducer from the surface of the fuel. The measurement is reliable and accurate, with sophisticated signal processing by Pulsar’s dedicated DATEM software system. In addition, the Pulsar Ultra Controller can calculate volume based on almost any standard tank shape, taking the tank dimensions and making the calculations necessary to convert them into the volume of fuel in the tank.

Pulsar on-tank hardware and remote display screens

Pulsar ‘on-tank’ hardware and UltraScan display screens

Pulsar also supplied UltraScan software, which uses the RS485 Modbus output of the Ultra to provide a screen display of both levels and alarms. UltraScan can operate either on a site basis or can bring together measurements from a variety of sites.

Staff at Northern Rail are using the system very effectively. Austin-Lenika tested the system by comparing delivered fuel from a tanker to measured levels from the Pulsar system, finding a variance from a 6000 litre delivery of ‘within 60 litres’, achieving the ±1% target.

E+H posts 2013 results: sales up 7%

The financial year for Endress + Hauser ends at the end of December, and in 2012 the results were published in May (reported in the INSIDER in June 2013, page 6). At that time Klaus Endress said that “2012 was not an easy year”, despite E+H sales increasing 11% and profit up 10%, after notably good results in the USA.

Now, for the 2013 results, Endress have already announced preliminary figures – although full results will be published in May. CFO Dr Luc Schultheiss advises net sales were up 7% at just over Euro1.8Bn, and profits also showed an improvement compared to 2012. This was slightly below the target set a year ago by then CEO Klaus Endress, who set an ambitious 10% target for sales growth – but significantly Klaus Endress had planned for 550 extra employees in the base business, and the actual increase by year end was 553.

A further 1300 employees joined the E+H Group through the major acquisitions during 2013: these new businesses also provided 2% of the total 7% sales growth. Most significant were the takeover of Kaiser Optical Systems in the USA, specialists in Raman spectroscopy, in November, and the German laboratory analysis equipment specialist Analytik Jena, where E+H took over management control in September.

Overall Dr Schultheiss stated the Group management were satisfied with these 2013 results, achieved despite a significant fall in value of the currencies of Japan and several of the emerging countries where E+H also trades.