API Recommended Practice 551, Process Measurement, covers design and installation guidance for pressure, temperature, level, and flow measurement technologies.   The 3rd edition is expected to be published toward the end of 2025. Melissa Westbrook, Senior Consultant and SIS-TECH's representative on the API 551 committee, provides an overview of the upcoming changes.

The 3rd edition includes changes to the level technology and temperature measurement sections, such as expanded technical coverage of nuclear level systems, design requirements for protection tubes, testing recommendations for thermowell, and multipoint temperature measurement system design features.  

The instrument installation section has been updated to expand guidance for pressure measurement mounting practices and provides installation strategies to minimize vibration and thermal effects.

The updated document will include a new section that discusses instrument inspection before system commissioning.  This new section will include general instrument infrastructure inspection - such as tubing inspection and leak testing procedures - and recommended inspection scope for the different types of level, temperature, pressure, and flow instrumentation technologies. 

SIL Solver Enterprise+ (SSE+) is a functional safety lifecycle tool for all instrumented protection layers, such as safe operating procedures, safety alarms, BPCS IPL, safety instrumented systems, high integrity protective systems, fire and gas systems, and equipment protection systems. Whether a SIS or a LI-PL (refer to draft ISA84.91.03), SSE+ eliminates barriers to process safety information, including the hazard registry, functional requirements, design configuration, performance verification, and maintenance plan. SSE+ seamlessly transfers new/changed data to stakeholders and generates specifications, I/O Lists, and maintenance procedures based on current information.

Join Kushal Parikh, Design Consultant & Technical Support Lead, as he showcases how SSE+ simplifies complex safety lifecycle tasks with its intuitive design and seamless information management.

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