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Safety
Enhanced Version of Safety Instrumented System Includes New Modules for Large-scale Plant Applications
Yokogawa Electric Corporation (Netherlands) announces the release of ProSafe-RS R2.03.00, an enhanced version of the ProSafe-RS Safety Instrumented System. The enhancements include a new CPU module that is 3.5 to 4 times faster than the module used in the preceding version and a new digital output module that is intended for use with higher voltage devices. This new system satisfies users' latest safety instrumentation requirements, improves efficiency, and ensures operational safety.
There is a growing emphasis on safety instrumented systems for operational safety in energy and basic materials industries such as oil, natural gas, petrochemicals, and iron & steel that is driven by the need to provide a safe workplace, protect the environment, and be a responsible corporate citizen. Moreover, as companies around the world seek to achieve economies of scale and enhance competitiveness by building ever larger plants, there is a corresponding need for increased plant availability, higher operating speeds, larger capacity, and enhanced maintenance efficiency.
Yokogawa has therefore developed this enhanced version of the ProSafe-RS Safety Instrumented System with features such as a high-speed CPU module and a strengthened online maintenance function, and is targeting its use mainly in those international markets where many large projects are planned.
The new CPU module has a processing speed that is 3.5 to 4 times faster than the module used in the preceding version. The number of I/O points has been increased to 1500, an increase of nearly 50%, and application capacity has been increased by 50%. These enhancements make the system ideal for use in large-scale plants.
A digital output module has been added that enables ProSafe-RS to be directly connected to 48 V DC field devices such as valves. This elimination of the need to supply power through a relay allows a simpler and more cost-effective system configuration that is easier to maintain.
A function has been added that allows the installation of I/O modules without disrupting input/output to or from any connected devices. The scan frequency can also be changed online. This ability to reconfigure the safety instrumented system without halting plant operations improves productivity.
Major target markets and applications include oil, natural gas, petrochemicals, and other process industries that use systems for emergency plant shutdown, fire prevention/fighting, and burner management
Released in February 2005, the ProSafe-RS Safety Instrumented System helps to prevent accidents by detecting unusual conditions in plant operations and taking emergency actions such as shutting down the plant. Unlike conventional safety instrumented systems and distributed control systems (DCSs), which are regarded as having different roles and functions and operate separately, the operation of ProSafe-RS and Yokogawa's CENTUM DCS Series can be fully integrated. An independent certification body has certified that ProSafe-RS conforms to the IEC61508 international safety standard and can be used in SIL3 applications. As a result, ProSafe-RS is highly regarded by users and has been installed in more than 500 projects worldwide since its release.
IEC61508 is a standard relating to the functional safety of electrical and electronic equipment that was established by the International Electrotechnical Commission (IEC). Safety integrity levels (SIL) are defined by the IEC. At SIL3, the risk factor for a plant where safety measures are not in place has been reduced to a range from 1/1000 to 1/10000.
Reader Reply Card No 94
ATEX-Rated, Electrically Actuated Ball Valves Provide Safe Shut Off for Fuel Oils in Overfill Alarm Systems
Burkert’s (Germany) 8804 ATEX- rated electrically actuated ball valves are providing the safe shut off of heating oil and diesel fuels at multiple depots operated by one of the UK’s largest fuel distributors. The valves are employed by flow and level measuring specialists, Severn Instruments, as part of the company’s tank overfill protection alarm system (TOPAS). The TOPAS system is critical to safe and efficient operation at fuel depots, as fuel spillages are potentially hazardous and cost around £1,000 per litre to clean up.
Severn Instruments has a contract from the fuel distributor to install its TOPAS system in depots right across the UK. So far, the company has installed the system at 25 depots, with many more to come.
“The tanks at the depots where we are fitting our TOPAS system range from 50,000-litres up to-1,000,000 litres,” said John Roberts, Owner of Severn Instruments. “With such large volumes, the depot operators have to be very careful of overfilling of tanks during deliveries. This is where our TOPAS system comes in. After checking in, drivers delivering fuel to the depot connect their hose to the appropriate tank; this could be Kerosene (heating oil) or white or red diesel. The driver then presses a button on a central control panel to test the tank alarm system. Normally this is set at 97% of volume, 2% above the normal gauging level of 95%. If the alarm sounds, then the gauging system is operative and the filling cycle begins. However, if for any reason the filling exceeds the 95% level, the alarm system blasts and signals the Burkert 8804 valves to close in a timed sequence of less than 30-seconds – this to give time to switch the pump off – preventing any fuel spilling over the top of the tank.”
PGD3-IR
Backlit Graphic Display 360° Visual Alarm IP 66 Ingress Protection Data Logging Option International Approvals CE Marked Internal Sample Pump Option
The PGD3-IR features IR sensors for 0-100% LEL combustible gas and carbon dioxide in ranges from ppm to 100% by volume. Also available for O2, CO, H2S, NO, NO2, NH3, SO2, HCl, Cl2, etc. This rugged instrument is ATEX certified and CE approved.
Multi-Gas Detector
Featuring Infrared LEL & CO2 Sensors Also for Oxygen & Various Toxic Gases
“When we won this contact we knew that we needed a highly reliable, IP67 rated, ATEX shut-off valve that would operate seamlessly with our TOPAS system. Burkert’s 8804 valve ticked all of these boxes; we were also recommended to use Burkert on the project, and we know from experience that their equipment is very good.”
The Type 8804 valve as used by Severn Instruments is tailor-made for the application; it is suitable for use with aggressive media, such as fuel oils and diesel, and for operation in arduous conditions, thanks to an IP67 ingress rating. ATEX-rated, the 8804 integrates a small electrical rotary actuator with adjustable limit switches and a manual override, a visual indicator into a single compact, and robust assembly that is easy to install in restricted spaces.
Reader Reply Card No
95
Gas Transceiver Offer Gateway toWireless Modbus™
www.enmet.com
info@enmet.com Phone: 734-761-1270 Fax: 734-761-3220 Ann Arbor, Michigan
Reader Reply Card No 96
Detcon's (USA) Model RXT-300 is a new wireless mesh-network transceiver designed to transmit signal data in a wide range of industrial applications. The transceiver operates at a universally acceptable frequency of 2.4GHz. Model RXT-300 uses direct sequence spread spectrum wireless mesh technology. Processing power is shared among transceivers allowing each one to act as both a router and repeater within a network. This unique and innovative technology allows transceivers to "hop" through neighboring devices and automatically route around congestion and line-of-sight obstacles to communicate. The Model RXT-300 wireless transceiver has a 3-mile line-of-sight range that can be extended up to 15 miles with high gain antenna. Signal data can be analogue 4-20mA DC or serial MODBUS™ with a network capacity of up to 32 devices. Electrical classification is Class 1, Division 1. Operating temperature range is -40 to +85o
C. Reader Reply Card No 97
Annual Buyers’ Guide 2010
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