functional safety of a stationary fuel cell power system
March 17, 2022
Jon Keswick, CFSE

Stationary fuel cell safety standard IEC 62282-3-100 requires a written hazard and risk assessment, and consideration of functional safety design principles. Such assessments may not seem challenging at first, but certain early decisions are critical to success. How do you approach functional safety of stationary fuel cell systems?The world is Read More

October 8, 2021
Jon Keswick, CFSE

IntroductionSafety Integrity Level (SIL) Verification is needed when a Safety Instrumented Systems (SIS) is one of the critical independent protection layers for process safety. Applications of SIS include automated isolation, trips or interlocks found commonly in oil & gas upstream, refining, chemical and pharmaceutical production.Get the correct inputs firstBefore a Read More

How to select a safety PLC
March 5, 2021
Jon Keswick, CFSE

When it comes to implementing safety instrumented systems (SIS) to comply with functional safety standard IEC 61511, the safety PLC is a pivotal system to specify. So, what are the key questions that you need to ask if choosing a new system supplier? Read more here.What is the difference between standard and Read More

What is hardware fault tolerance - HFT
September 3, 2020
Jon Keswick, CFSE

You may not know or care much about Hardware Fault Tolerance (HFT) unless you're working in a hazardous industry with Safety Integrity Level *SIL requirements. However, just like the multiple safety systems in your motor vehicle, systems used for protecting hazardous process plants are often built with intentional redundancy, both for Read More

Safety Instrumented Function - SIF Design
July 28, 2020
Jon Keswick, CFSE

A SIF gets specified as an automated independent protection layer (IPL), often as the result of a safety integrity level (SIL) target-setting exercise, also known variously as a SIL determination, SIL study or SIL assessment.Like any many other safety engineering activities, designing a safety instrumented function (SIF) usually involves several Read More

What is MTBF in relation to SIL
July 8, 2020
Jon Keswick, CFSE

Are the terms "Mean Time Between Failures" (MTBF) and "Safety Integrity Level" (SIL) related to each other? Some would think not but read on if you'd like to discover if that's true.MTBFEquipment suppliers have been providing MTBF data for their electrical and electronic equipment for decades. The base information usually Read More