Keith Brumbaugh

Keith Brumbaugh is a Senior Specialist with aeSolutions. He has a B.S. in electrical engineering with a minor in computer science from Texas Tech University. Keith is both a Professional Engineer (P.E.) and a Certified Functional Safety Expert (CFSE). He has over ten years of experience in instrumentation and safety systems engineering.

White Papers by Keith Brumbaugh:

How taking credit for planned and unplanned shutdowns can help you achieve your Safety Integrity Level (SIL) targets

Achieving Safety Integrity Level (SIL) targets can be difficult when proof test intervals approach turnaround intervals of five years or more. However, some process units have planned and predictable unplanned shutdowns multiple times a year. During these shutdowns, it may be possible to document that the safety devices functioned properly. This can be incorporated into SIL verification calculations to show that performance targets can now be met without incorporating expensive fault tolerance, online testing schemes, etc. This can result in considerable cost savings for an operating unit.

This paper will discuss various solutions to meet a SIL target, taking credit for planned and unplanned shutdowns to help meet a SIL target, justification for applying diagnostic coverage in SIL verification calculations, summary of determining diagnostic credit, applying diagnostic credit from a shutdown event, and a case study.

 

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Improving the Safety Instrumented System (SIS) Design Process with Graphic Diagrams

During a Safety Instrumented System (SIS) implementation project at a plant site new to the ANSI/ ISA 84 process safety lifecycle world, we discovered the importance of utilizing graphic diagrams in the development of SIS‐related documentation to support the on‐site team meetings and document decisions. The author will present examples of the different types of graphic diagrams, methods in which the diagrams were utilized, and the benefits that each provided in the implementation of certain phases of an ANSI/ ISA 84 SIS lifecycle project. These diagrams were considered to be valuable process safety information and part of the final SIS Front End Loading design.

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