PRISM-certified® - Part 2: IPS Performance and SIL Verification
Overview
PRISM-certified® is a certificate-in-training program addressing the design and lifecycle management of instrumented protective systems. The target audience includes technical personnel who need to understand the latest standards and practices for safe automation. To become PRISM-certified®, students must complete all three classes in the program and score at least 80% on an online exam.
This course provides fundamental instruction in the ways IPS device performance can impact both IPS integrity and operational reliability, the design verification of safety integrity level (SIL) for safety instrumented functions (SIF) implemented per ISA 61511-1, and the evaluation of IPS spurious trip rate. Course covers IPS device failure rate data and key design parameters, analysis of safety instrumented system (SIS) mode of operation, and multiple SIL calculation methodologies, including hands-on practice.
Student Materials
Attendees should bring a laptop to participate in supplemental exercises using software
Pre-requisites
This course and the PRISM-certified® program have no specific education, experience, or nomination requirements. Participants earn PRISM Certification by successfully completing the required classes and testing. Attendees are expected to have a technical background in instrumented systems and basic knowledge of process operations.
Objectives
The course participants will gain an understanding of the following:
- Impact of SIS mode of operation on methodology used for SIL calculation
- Approaches for selection of data to be used in SIL calculations and situations where modification of the source values may be needed
- Identification of the hardware subsystems to include in the SIL calculation
- Two most common calculation methods for performing PFDavg calculations
- Basic diagramming methods to use when understanding subsystem architectures
- Impact of voting architecture and specified SIF response to detected failure on the calculated PFDavg
- Potential use of diagnostics and partial testing to satisfy proof test interval targets from the SIS specification.
- How to recognize SIS designs that will require a more advanced calculation methods
- Recognizing when it is necessary to incorporate automation utility or other auxiliary systems in the SIL calculation