Staying Safe Requires Layers of Protection

When It Comes to Plant Safety, Honeywell Tells End Users to Know What Layers of Protection They Have In Place, and to Find Out Which Needed Layers Are Missing

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In addition, de Groot reported that Experion Integrated Safety runs SM-C300 P2P over FTE between C300 controller and C Series I/O and Safety Manager controller and I/O, operates SafeNet P2P over FTE between Safety Manager components, and also can use Modbus TCP between Safety Manager and other devices. The Safety Manager controllers and I/O can be linked via SafeNet P2P over a separate and segregated network to a safety station and other safety components.

C300’s communications can share data between the process control system and the safety application by enabling a direct interface to the CEE controller family, currently C300, using built-in redundancy, multiple connections, bi-directional data transfer and fault reaction configuration per point, added deGroot.

If users need safety-related services, HPS’ life-cycle support includes hazard and risk analysis, allocation of safety functions to protection layers, safety requirements specifications for the SIS, design and engineering of the SIS, installation, commissioning and validation, operation and maintenance, modification and decommissioning. Complementary services include safety life-cycle structure and planning and management of functional safety assessment and auditing. Other services include verification.

De Groot added that it’s important for users to understand IEC 61511 prior-use rules about safety, which include 11.5.3 requirements for the selection of components and subsystems based on prior use. For instance, states that appropriate evidence shall be available that the components and subsystems are suitable for use in the safety instrumented system. He added that it should be noted that, in the case of field elements, there may be extensive operating experience either in safety or non-safety applications. This can be used as a basis for the evidence. “Likewise, users also can employ SIS-Health Monitoring Tool to secure data and determine failure-rate levels and then develop target requirements to aid proven-in-use arguments,” said de Groot.

“So how does Honeywell’s dedication to process safety compare to the alternatives? Honeywell’s layered approach to process safety includes a completely integrated solution from basic control via advanced applications to safety, fire-and-gas and security solutions. It also has TÜV-certified global project execution process and engineering centers, offers proven-in-use safety systems with long-guaranteed support and migration options that don't leave the customer behind, and the SIL level of the logic solver is guaranteed and doesn’t depend on the application. Also, all application and hardware changes can be made on-process; users have to freedom to select integrated or segregated systems; and users can access safety life-cycle consultancy and tools,” explained de Groot. “However, alternative programs have only loose product portfolios in which users must make the interaction work, and often have only country/site specific processes and engineering. They’re also limited by multiple products—some current and some obsolete without migration paths. These often require specific application considerations, additional safety measures and costly proof-testing. In addition, some changes to the safety system require users to stop their process or give the safety responsibility to the operators. This means they often have no choice—either you get it over-integrated or you get it too loose. There’s no in-house consultancy or life-cycle tools either.”

Finally, de Groot reported that Safety Manager’s and C300’s control integration, F&G FTA with HART support, improved robustness, remote management, QPP-0002 and SafeNet P2P in 2008 will pave the way for FF-SIS customer evaluation and Safety Manager remote I/O and Microsoft Vista OS support in 2009.

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