Appleton PlexPower Motor Starter
uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
Appleton PlexPower is designed for hazardous areas, wet or corrosive locations such as oil refineries and chemical plants, the Appleton PlexPower hazardous area motor starter provides electrical apparatus protection combined with the convenience and savings of off-the-shelf components.
Appleton PlexPower motor starter is a cost-effective, easy-to-install and simple-to-operate alternative to traditional cast and bolted motor starters in the form of its new Appleton PlexPower solution for hazardous area applications.
Appleton PlexPower motor starters deliver savings up to 73% compared to the total cost of ownership of traditional cast and bolted motor starters – they are fabricated from lightweight 316L stainless steel instead of heavy-cast aluminum, PlexPower motor starters require fewer engineers and less labour hours to install. Also, there is no need for conduit seals or cable glands like with traditional cast and bolted motor starters.
Another advantage is the hazardous area certified motor starters are not limited only to switch rack mounting. For example, by locating the PlexPower closer to motors and equipment, electricians can shorten cable runs to achieve lower overall labour and materials costs. Modular design construction using cost effective off-the-shelf breakers, contractors and motor starters also ensures faster commissioning by making replacements readily available from multiple suppliers.
Hazardous Area Motor Starter – Appleton PlexPower
“The Appleton PlexPower delivers on Emerson’s enduring commitment to the electrical professional with a patented design that saves time and money, while giving electricians working in hazardous locations much needed peace of mind,” said Tim Graff, Vice President of Engineering for Emerson Automation Solutions. “Because it is easier to install, operate, upgrade and maintain, it is the perfect alternative to traditional cast motor starters.”
Appleton PlexPower motor starters offer fast installation by increasing mounting flexibility with a slimmer footprint and flexible, modular design. They can be configured in single or multiple motor starter designs to reduce space requirements in crowded control rooms while meeting exact specifications. In addition, the starters can be mounted standalone at various locations throughout a facility, giving additional convenience while saving valuable space and cabling costs.
Accessibility to enclosures is one of the biggest challenges for end users installing, operating, and maintaining hazardous area motor starters. To access internal components in traditional cast and bolted enclosures, up to 70 bolts must be loosened and then tightened again, leading to extended production downtime and potentially greater risk to arc flash accidents. Plus, improperly torqued or missing bolts can be dangerous and cause accidents or safety risks.
To combat this time-consuming and potentially dangerous situation, the PlexPower is designed for easier accessibility to be quickly opened with a few quarter-turn latches rather than multiple bolts. Only standard tools are needed to open and close the enclosure, which means production lines can be up and running in less time and greater profitability.
The Appleton PlexPower Motor Starter modular design improves worker safety by limiting workers’ exposure to high levels of incident energy when installed close to the application. Component level protection means every component has its own module with its own flame path. The result is fewer workplace accidents, a diminished risk of damaging the flame path, and greater flexibility and convenience for the end-user.
Appleton PlexPower Motor Starters are available with up to a NEMA 1 size starter and have NEC and CEC Certification for Class I, Division 2 or Class I, Zone 1 and Type 4X hazardous area applications.
OFFICIAL & AUTHORISED STOCKIST DISTRIBUTOR | ATX | UK & Export Sales
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Full range of Appleton ATX Hazardous Area Products available from Thorne & Derrick stock and 5 Day Express Service:
Thorne & Derrick International, based in the UK, are Specialist Distributors of Hazardous Area & Explosion Proof Equipment with IECEx & ATEX Certifications to the onshore and offshore oil, gas, petrochemicals and process industries.
Key Product Categories: Control Panels | Plugs & Sockets | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace Cables & Systems | Gas Detection & Detectors | Fire Detection & Detectors | Heat Detectors | Electrical Heating & Heaters
Also Process Instrumentation Products: Ashcroft Pressure Gauges | ASCO Valves | Katronic Flow Meters | KROHNE Flow Meters | VEGA Level Sensors | Rotronic Temperature & Humidity Sensors | SIKA Pressure Gauges
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Appleton Contender LED Series Luminaire
uploaded by Chris Dodds - Thorne & Derrick Sales Marketing Manager
Explosion Proof Lighting – Appleton Contender
Class I, Division 2 and Class I, Zone 2, Class II, Division 1 and 2, Zone 21 and 22, and Class III
Appleton Contender LED, an extra low-profile enclosed and gasketed LED explosion proof lighting that brings energy and maintenance savings of up to 65 percent to challenging low clearance areas, such as walkways, catwalks, stairwells and tunnels in explosive atmospheres.
Designed specifically for hazardous area retrofit lighting applications, this cost-effective light fitting mounts directly to the hood of a competitor’s High-Intensity Discharge (HID) hazardous area lighting without an adapter, saving time and labour costs.
“Until recently, HID has been the primary light source for hazardous area locations. LED is now the go-to choice for retrofitting the installed base of tens of thousands of HID luminaries,” said Michael McCormack, Director of Product Marketing, Emerson Automation Solutions. “To meet this growing market demand, the Appleton Contender LED was designed to directly retrofit to one of our competitor’s most popular HID models. Additionally, it is certified with Appleton Mercmaster LED Low Profile globes and many of its accessories including the visor, angled reflector, globe guards and safety cable.”
💡 Did you Know? Thorne & Derrick using latest software provide a FREE LIGHTING DESIGN SERVICE for the specification and supply of ATEX & IECEx Certified light fittings to provide safe and reliable lighting in explosive atmospheres and hazardous area locations.
Oil and gas facilities, chemical processors and other hazardous area place critical demands on luminaries, especially when it comes to extreme temperature ranges and long service lives. The Appleton Contender LED provides rated illumination through its full ambient operating temperature range of -40° F to +149° F to make sure facilities are safely lit in arctic cold or when the going gets hot. In addition, it features a rated L70 lifetime of 100,000+ hours — the equivalent of more than 11 years — adding value while minimising maintenance requirements.
To withstand particularly harsh areas the light fitting construction includes:
With three lumen output options and four interchangeable and field replaceable globes options – clear and diffused polycarbonate, clear glass or prismatic glass refractor – this luminaire light fitting delivers the lighting equivalent of 70W to 175W HID luminaires to provide a fully customized solution.
To ensure safe operation in hazardous areas where flammable gases or vapors may be present, the Appleton Contender LED is engineered to meet or exceed industry standards to assure workers in places such as offshore rigs, petrochemical and chemical processing plants, water treatment plants, and grain elevators can work productively and comfortably.
The hazardous area LED light fitting is NEC/CEC certified for hazardous locations rated Class I, Division 2 and Class I, Zone 2, Class II, Division 1 and 2, Zone 21 and 22, and Class III, as well as NEMA Type 3R, 4 and 4X wet locations and is IP 66/67 and ABS certified.
OFFICIAL & AUTHORISED STOCKIST DISTRIBUTOR | ATX | UK & Export Sales
Lighting ♦ Plugs & Sockets ♦ Control Stations ♦ Junction Boxes
Full range of Appleton ATX Hazardous Area Products available from Thorne & Derrick stock and 5 Day Express Service:
Thorne & Derrick International, based in the UK, are Specialist Distributors of Hazardous Area & Explosion Proof Equipment with IECEx & ATEX Certifications to the onshore and offshore oil, gas, petrochemicals and process industries.
Key Product Categories: Control Panels | Plugs & Sockets | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace Cables & Systems | Gas Detection & Detectors | Fire Detection & Detectors | Heat Detectors | Electrical Heating & Heaters
Also Process Instrumentation Products: Ashcroft Pressure Gauges | ASCO Valves | Katronic Flow Meters | KROHNE Flow Meters | VEGA Level Sensors | Rotronic Temperature & Humidity Sensors | SIKA Pressure Gauges
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Appleton A-51 Lighting Fixture
uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
Appleton A-51 Lighting Fixture | LED Version
The field-proven Appleton A-51 hazardous area lighting fixture is now available in an LED version, a move that will save end-users as much as 80 percent on energy costs compared to the incandescent model, while simplifying retrofit applications for lighting installations in explosive atmospheres.
Appleton A-51 LED explosion proof light fitting is designed to provide the benefits of LED lighting in low mounting height applications previously served by incandescent luminaires.
Easy to install in new and retrofit applications, the light fitting fits in the same mounting hoods as traditional incandescent Appleton A-51 luminaires with no rewiring. Models are available for Group A, B, C and D areas (AAL) as well as strictly Group C and D areas (AL).
First introduced in 1951, the Appleton A-51 incandescent factory-seal luminaire has long been a standard for industrial and hazardous area lighting, providing safe illumination to workers in petrochemical processing, wastewater treatment centers, chemical plants and other areas classified as “hazardous” by the National Electrical Code where ignitable vapors, dust, moisture and corrosive environments may be present.
Because it uses the same mounting as the original A-51, the LED light fitting version transforms the traditional retrofit lighting process from an expensive, time-consuming task to simply removing the legacy incandescent fixture unit and replacing it with the new LED fixture unit. Appleton’s standardized threads fit all A-51 LED light fittings and fixtures and mounting hoods. In the rare event the A-51 LED requires maintenance, its “wireless” design allows the fixture unit to be threaded off the mounting hood for fast servicing or immediate exchange with a stand-by replacement.
“The new A-51 LED model brings the potential benefits of burning less energy, producing less heat, and requiring less maintenance to the thousands of A-51 incandescent fixtures currently in service,” said Christy Buttner, lighting product manager for Emerson Automation Solutions. “Best of all, there is no compromise in hazardous area lighting quality since the LED pattern and spread of light is very similar to the older incandescent version of the A-51.”
Leveraging years of experience in designing and manufacturing LED fixtures for some of the harshest environments, Emerson is offering the new luminaries or light fittings in an output range of 1,600 to 3,200 lumens to replace incandescent lighting fixtures up to 300 watts. The light fittings deliver crisp, bright light with excellent colour rendering for optimal visibility. The LED lamp’s long lifespan of 50,000+ hours maximizes its value while lowering the cost of ownership, improving work environment safety and delivering shorter paybacks to the hazardous area industries.
To guard against corrosion and chemical abrasion the Appleton A-51 LED’s fixture unit, mounting hoods and guards are manufactured from copper-free, die-cast aluminum, and feature Appleton’s exclusive epoxy powder coat finish to assure long-term corrosion resistance. In addition, end-users can specify either porcelain reflectors for standard applications or fiberglass reinforced polyester reflectors for exceptionally severe corrosive atmospheres.
New Appleton A-51 LED luminaries are suitable for wet locations, and are compliant with NEC/CEC certifications for Class I, Division 1, Groups A, B, C, D; Class II, Division, Groups F, G; Class III, and Class I, Division 1, Groups C, D; Class II, Division 1, Groups E, F, G; Class III hazardous applications.
Appleton A-51 Lighting Fixture | LED Lighting
OFFICIAL & AUTHORISED STOCKIST DISTRIBUTOR | ATX | UK & Export Sales
Lighting ♦ Plugs & Sockets ♦ Control Stations ♦ Junction Boxes
Full range of Appleton ATX Hazardous Area Products available from Thorne & Derrick stock and 5 Day Express Service:
Thorne & Derrick International, based in the UK, are Specialist Distributors of Hazardous Area & Explosion Proof Equipment with IECEx & ATEX Certifications to the onshore and offshore oil, gas, petrochemicals and process industries.
Key Product Categories: Control Panels | Plugs & Sockets | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace Cables & Systems | Gas Detection & Detectors | Fire Detection & Detectors | Heat Detectors | Electrical Heating & Heaters
Also Process Instrumentation Products: Ashcroft Pressure Gauges | ASCO Valves | Katronic Flow Meters | KROHNE Flow Meters | VEGA Level Sensors | Rotronic Temperature & Humidity Sensors | SIKA Pressure Gauges
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Appleton Code Master Light Fittings
uploaded by Chris Dodds - Thorne & Derrick Sales Marketing Manager
Appleton Code Master Light Fittings
Appleton Code Master simplifies upgrading from legacy HID lighting to the more energy efficient LED (Light Emitting Diode) as the LED lighting for hazardous areas has familiar lighting patterns of traditional incandescent and HID (High Intensity Discharge) fixtures.
The new explosion proof lighting fitting is compatible with the legacy Appleton Code Master and therefore is easy to retrofit to the current lighting installation in less than five minutes.
💡 Did you Know? Thorne & Derrick using latest software provide a FREE LIGHTING DESIGN SERVICE for the specification and supply of ATEX & IECEx Certified light fittings to provide safe and reliable lighting in explosive atmospheres and hazardous area locations.
In addition, the light fitting delivers crisp white light for superior colour rendering and a safer working environment, while allowing facility managers to take full advantage of impressive LED cost savings of up to 85% in petrochemical and chemical processing plants, refineries, waste treatment centers and other hazardous zone locations – delivering 60,000 hours of labour-saving, virtually maintenance-free lighting operation adding value by lowering maintenance costs and requiring fewer stand-by units be kept in stock.
Its service life is four times as long as an HID so it eliminates the high cost of frequent lamp or ballast replacement for lighting systems in explosive atmospheres.
Appleton Code Master Light Fittings Hazardous Area Lighting Download
“The Code Master Jr. HID from Appleton has been a hazardous area industry standard for decades,” said Christy Buttner, lighting product manager for Emerson Automation Solutions. “The new Appleton Code Master Jr. LED light fitting provides the same durability and reliability as the original along with money-saving energy efficiency. Retrofitting an HID lighting fixture only calls for removing the older fixture and threading in the new LED version, a process that takes mere minutes to complete.”
The new and improved Appleton Code Master is an ideal hazardous area lighting solution for high energy cost areas due to faster and more cost effective installation. The only wiring required is attaching two wires to the connection block of the mounting hood. Acme double-lead threads speed installation and fixture removal from the mounting hood with only half as many turns required compared to single-lead threads.
Appleton Code Master Jr. LED explosion proof lighting is designed to provide operation in the presence of ignitable gases, vapors or dusts, such as in wastewater treatment plants, petrochemical plants and oil refineries.
Meeting the National Electrical Manufacturers Association (NEMA) 3R and 4X performance criteria for enclosures, the new LED lighting fixtures are equally suitable for coastal locations and other wet environments that would damage standard lighting fixtures.
To fight corrosion caused by saltwater or chemicals, the lighting fittings and fixtures have a triple coat finish electrostatically applied for uniform protection.
The Appleton Code Master Jr. LED is available in models producing either 1600 or 3000 nominal lumens, which is the equivalent of 100W incandescent (50W HID) or 300W incandescent (70-100W HID), and in 5150 lumens (100-150 HID).
OFFICIAL & AUTHORISED STOCKIST DISTRIBUTOR | ATX | UK & Export Sales
Lighting ♦ Plugs & Sockets ♦ Control Stations ♦ Junction Boxes
Full range of Appleton ATX Hazardous Area Products available from Thorne & Derrick stock and 5 Day Express Service:
Thorne & Derrick International, based in the UK, are Specialist Distributors of Hazardous Area & Explosion Proof Equipment with IECEx & ATEX Certifications to the onshore and offshore oil, gas, petrochemicals and process industries.
Key Product Categories: Control Panels | Plugs & Sockets | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace Cables & Systems | Gas Detection & Detectors | Fire Detection & Detectors | Heat Detectors | Electrical Heating & Heaters
Also Process Instrumentation Products: Ashcroft Pressure Gauges | ASCO Valves | Katronic Flow Meters | KROHNE Flow Meters | VEGA Level Sensors | Rotronic Temperature & Humidity Sensors | SIKA Pressure Gauges
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by G.M. International srl
Via G. Mameli, 53-55
I-20852 Villasanta (MB)
SIL3 or Safety Integrity Level (SIL) is based on the value of risk reduction associated with a Safety Instrumented Function (SIF) protecting against a specific hazardous event, or how the risk has to be reduced to reach an acceptable level.
The determination of a SIL is based on quantitative and qualitative factors such as:
Read the following article about SIL 3 to learn more about Safety Integrity Levels, the need for SIL 3, its determination and implementation costs.
The implementation of Safety Instrumented Systems (SIS) is a common way to address hazards.
The eventual need for such instrumented protection must always be determined. If needed, the appropriate Safety Integrity Level (SIL) must be identified in order to achieve the required level of safety.
This process is crucial for achieving safety.
As we will see, SIL 3 is the appropriate level in rare and quite dangerous situations.
The Safety Integrity Level (SIL) is based on the value of risk reduction associated with a Safety Instrumented Function (SIF) protecting against a specific hazardous event, or how the risk has to be reduced to reach an acceptable level.
Therefore it is a relative level of risk-reduction provided by a safety function, and, in other words, provides a measurement of the performance of a Safety Instrumented Function (SIF).
In IEC 61508 Standard, safety is defined as “freedom from unacceptable risk of harm”, while risk is the combination of the probability of occurrence of harm and the severity of that harm (R=FxC, where F is the Frequency of accidents and C is their Consequences, evaluated as a cost; therefore R is defined as cost per time unit).
Not all of the functional safety standards provide the same requirements for given SIL’s. IEC 61508 defines four SIL’s, with SIL 4 the most dependable and SIL 1 the least.
SIL is a measure of reliability and risk reduction used in several international standards;
The determination of a SIL is based on quantitative and qualitative factors such as development process and safety life cycle management. For example, the safety lifecycle includes a hazard and risk assessment phase, in which all significant hazardous events have to be identified and then subjected to an assessment to determine the level of risk reduction required from a safety instrumented function (SIF) to achieve a target level of risk.
The SIL expresses the required risk reduction or performance for the SIF. This assessment, called SIL determination, defines the required performance or “target SIL” for the SIF, and a target Average Probability of Failure on Demand (PFD), representing the maximum value allowed in the range of a target SIL.
The SIL determination methods commonly used are: Safety Layer Matrix (SLM); Risk Graphs (RG); Layer of Protection Analysis (LOPA); Fault Tree Analysis (FTA); and Event Tree Analysis (ETA), and they are normally used in combination, with LOPA being the most commonly used by large industrial facilities, SLM the simplest, FTA and ETA the most flexible and therefore suitable to complex cases.
SLM and RG are used for initial screening assessments. Because of its flexibility and orientation to details, FTA is especially suitable for the reassessment needed when a SIL 2, SIL 3 or SIL 4 level is determined.
See ASCO Valves including Solenoid Valves SIL 3 Approved
Generally speaking, the assignment of a SIL is made as follows: the risk associated with a specific hazard is calculated without the risk reduction effect of the SIF. Then, the risk determined is compared to a risk target considered acceptable. The risk reduction of the SIF must address the difference between the unmitigated risk and the tolerable risk, with the SIL target corresponding in a correlation relationship to the required risk reduction, where the greater the reduction required, the higher the required SIL.
The International Electrotechnical Commission’s (IEC) standard IEC 61508 groups the requirements into the two categories of hardware safety integrity and systematic safety integrity. According to the standard the requirements for both categories must be met for a device to achieve a certain SIL. For hardware safety integrity, the requirements are statistical, with specific targets to reach, as the maximum probability of dangerous failure and the minimum safe failure fraction. In IEC EN 61508, the requirements for PFD (probability of failure on demand) and RRF (risk reduction factor) for different SIL’s for low demand operations are:
| SIL | PFD | PFD (power) | RRF |
| SIL 1 | 0.1-0.01 | 10-1 – 10-2 | 10-100 |
| SIL 2 | 0.01-0.001 | 10-2 – 10-3 | 100-1000 |
| SIL 3 | 0.001-0.001 | 10-3 – 10-4 | 1000-10.000 |
| SIL 4 | 0.0001-0.00001 | 10-4 – 10-5 | 10.000-100.00 |
and for high demand of operation or continuous operation (Probability of failure per hour)
| SIL | PFH | PFH (power) | RRF |
| SIL 1 | 0.00001 – 0.000001 | 10-5 – 10-6 | 100.000 – 1.000.000 |
| SIL 2 | 0.000001 – 0.0000001 | 10-6 – 10-7 | 1.000.000 – 10.000.000 |
| SIL 3 | 0.0000001 – 0.00000001 | 10-8 – 10-9 | 10.000.000 – 100.000.000 |
| SIL 4 | 0.00000001 – 0.000000001 | 10-9 – 10-10 | 100.000.000 – 1.000.000.000 |
Need for a SIL 3 Safety Function is rare at process plants.
At process plants, most SIF won’t require higher than SIL 1. For safety functions requiring above SIL 2, several questions have to be addressed, regarding the use of the correct formula for reliability calculation, the consideration of common cause failure, the use of the right method to select appropriate values for common cause factors, the inclusion of the contributions from human error in the calculation of PFD, the inclusion of all relevant factors in the assessment, the evaluation of the appropriateness of the methodology used (if suitable or not; RG, LOPA and SLM aren’t appropriate for SIL 3, which requires a review of the assessment with a fault tree.
In fact, the reassessment can lead to reassigning a SIL 3 requirement for the SIF to a target PFD in the range of a lower SIL, with a consequent reduction in both capital and operating costs).
SIL 3
When SIL 3 is necessary, the combination of hardware configuration and human interactions with the safety function must be accurately examined, with the determination of the demand frequency requiring particular attention and a systematic approach (through the use a demand tree), covering normal operation, abnormal operation, start-up, shutdown and demands initiated from outside the plant (loss of services, power, etc.), since these factors added together are very significant.
SIL 3 determination requires care.
Any prospective SIL 3 SIF demands reassessment. Three aspects of SIL determination deserve special mention for SIL 3: team competencies, alarms and personnel exposure.
With regards to team competencies, effective SIL determination requires input from many professionals, managed for example through meetings with a leader and representatives of all the relevant disciplines, chosen according to professional skills and personal attitudes, since they have to work well together. Such meetings can work well for initial screening purposes and may provide sufficient detail to justify SIL 1 safety functions, but for the higher SIL’s, requiring more details, appointing an independent professional to carry out the assessment could be more appropriate.
With regards to alarms, SIL determinations must consider potential risk reduction from operator response to alarms, which could be influenced by his availability at the time the alarm enters in function, by the eventually insufficient time to respond and by the number of alarms in function at the same time. It may be difficult for the operator to decide what to do, and every effort must be put in place to guarantee that he has all the proper directions to make the right decision and initiate the correct actions.
With regards to personnel exposure, and the potential consequences on the workers of a failure, there’s the need to consider the proportion of time that the person at risk may be in the area of the plant where an injury could occur, taking in consideration that, even if for a high hazard zone the proportion of the working day spent there is quite small (for example less than 10%), the person could be asked to go to the hazard area to investigate just when the incident occurs. In that case, the proportion changes drastically, because it would be in practice 100% of the time the hazardous event occurs.
Achieving and maintaining in the long term (that is to say, for the entire duration of the function) SIL 3 performance is a very hard task. As a consequence, when the need for a SIL 3 SIF is determined, the people involved in the Risk Reduction projects find themselves in the complex situation of demonstrating that SIL 3 performance is achieved by the combination of hardware and human interactions, such condition being very likely to be put in discussion at a further examination by company stakeholders or external regulatory authorities.
For example, one of the major implications of SIL 3 is that it requires a high degree of duplication, a condition that is related with what is described in international standards as “hardware fault tolerance.”, a requirement for continuous functioning (even if one or more faults occur) determining the need of more than one sensor and more than one means of output to guarantee that the function will continue to work in case of failures occurring between periodic tests. In addition, achieving the necessary PFDavg for SIL 3 (that is to say, in the range 0.001 to 0.0001) implies that the SIF’s unavailability to respond successfully over a 1 year (8760h) period can be maximum 8.76 hours or less, a value that must include the time when the organization is unaware that the function isn’t working.
Furthermore, SIL 3 is achieved only when the following four conditions are satisfied in the calculation of the PFD: 1) the failure rates used are those properly applicable to the situation, as direct field-failure ones; 2) an appropriate assessment of dependency is performed in order to guarantee that calculations are not grossly optimistic; 3) the unavailability of the function during testing is accounted for; and, especially, 4) the human interactions with the safety function are taken in consideration, because humans are involved in the maintenance, calibration and testing of SIF and the probability of mistakes by them (for example the same having little effect on a SIL 1 PFD) may make SIL 3 unachievable.
As a consequence, differently from a SIL 1 function, accurate design of the human tasks and assessment of the probability of human error (and its inclusion in the PFDavg calculation) are needed for a SIL 3 function. Such activities require specialist skills.
Compared to a SIL 1 function, SIL 3 features additional operating costs.
Those, for example incurred in proof testing duration and frequency, which is more frequent and longer than for a SIL 1 function because of the higher number of elements to test, of the greater complexity of the systems and the higher frequency of tests (SIL 3 proof test interval could be at least once a year but will depend on the proof test coverage achievable during the proof test of that SIF).
The Main Concepts with SIL 3 are the following:
In conclusion, SIL 3 is at the same time a target and a challenge and approaching it entails the use of the best skills and know-how owned by individuals and organizations. When the need for a SIL 3 Safety Integrity Level is determined, technology and human behaviors must be fit to the challenging goal.
Achieving safety, as “freedom from unacceptable risk of harm”, must be a fundamental objective in every productive activity and SIL 3 is a new frontier in Risk Reduction.
For further technical information see | Hazardous Area Zones | Explosive Atmospheres | T Class Ratings
Thorne & Derrick are Specialist Distributors of Hazardous Area & Explosion Proof Equipment with IECEx & ATEX Certifications to the onshore and offshore oil, gas, petrochemicals and process industries.
Key Product Categories: Control Panels | Plugs & Sockets | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace Cables & Systems | Gas Detection & Detectors | Fire Detection & Detectors | Heat Detectors | Electrical Heating & Heaters
Also Process Instrumentation Products: Ashcroft Pressure Gauges | ASCO Valves | Katronic Flow Meters | KROHNE Flow Meters | VEGA Level Sensors | Rotronic Temperature & Humidity Sensors | SIKA Pressure Gauges
Published 13 Mar 2020
Press Release Date: 02.04.2020 uploaded by Chris Dodds (T&D Sales + Marketing Manager) World’s First Fully Certified ATEX Doors Thorne & Derrick International, the Experts in Equipment for Explosive Atmospheres, today announce the signing of a Commercial Distribution Agreement...
Published 04 Jul 2019
Press Release Date: 04.07.2019 uploaded by Chris Dodds (T&D Sales + Marketing Manager) Category: Stockist Distributor Agreement Announcement Thorne & Derrick International announce that they have signed a Preferred Distributor Agreement with Raytec, the world leading manufacturer of LED...
