This 2-day course is designed to provide students with the tools necessary to perform SIL Validation studies compliant with the IEC 61511 standard. The practical course uses real life examples to demonstrate to students how to conceptually design multiple Safety Instrumented Functions (SIFs) to meet the specified safety integrity levels.

Note* The SIL Validation Workshop can be taking in conjunction with the SIL Determination / LOPA Workshop to gain a more thorough understanding of the Safety Lifecycle process.

This course teaches Functional Safety Engineering fundamentals to engineers and technologists responsible for designing Safety Instrumented Systems, including:

• I & C Team Leaders, engineers and technologists
• High Integrity and Critical Control System specialists
• Supervisors, managers and engineers responsible for ensuring that SIS have been designed to appropriately mitigate the level of risk specified
• Engineers involved in any aspect of the SIS Safety Lifecycle

*Note: We assume participants have some understanding of critical protection systems.

Malcolm Harrison, B.Sc. Mech. Eng., P.Eng., TÜV F. S. Expert

Mr. Harrison is a P. Eng. with over 38 years experience in Instrumentation and Controls. Malcolm spent over 35 years with Shell and has diversified upstream and midstream experience in the heavy oil, offshore, refining and gas processing sectors. He is an experienced SIL Determination facilitator and has worked on billion dollar projects ensuring horizontal I & C alignment between multiple EPCMs. Malcolm is a TÜV Functional Safety Expert and leads training workshops globally for ACM.

Ken Bingham, CET, TÜV F. S. Expert

Mr. Bingham is the Principal of ACM Facility Safety and a TÜV certified Functional Safety Expert. His background is in engineering design and management, involving safety, instrumentation, electrical and control systems. With Ken’s 27 years on the client side, integration side and the SIL consulting side, he brings a holistic and practical perspective. Mr. Bingham has participated on ISA S84 SIL standard committees, has presented numerous papers and courses on SIL Analysis and is the Chief Technical Architect for ACM’s field proven, IEC 61511 compliant Safety Integrity Level (SIL) Life Cycle tool, SilCore™.

The course is comprised of two days of combined classroom instruction and workshop exercises. In addition to expert instruction from an experienced SIS Engineer, you will also form a study team with other participants to work on case studies. Each team will then present their findings to the class and the ACM instructor will provide feedback. SilCore™ software is used throughout the workshop to conceptually design and evaluate SIF loops, document the SIL studies and produce typical SIL reports.

The course focuses on Phase 4 (SIS Design & Engineering) of the SIS Lifecycle within the IEC 61511 standard, but incorporates key elements of Phase 3 (Safety Requirements Specification of the SIS) and Phase 5 (SIS Installation, Commissioning & Validation).

WORKSHOP EXERCISE EXAMPLE

Given the following data, calculate the PFD of the Safety Instrumented Function (SIF) and offer alternate SIF configurations that will meet the target SIL.

Situation: Sour Hydrogen Gas Reciprocating Compressor

The hydrogen gas is highly flammable and very toxic (100 ppm H2S). The gas is cooled in an exchanger to knock out any liquids to prevent damage to the compressor.

Data Available:
A HAZOP has been performed on the system

• LOPA Tolerable Frequency (TF) is one fatality in 1,000 years
• Failure Rates (per million hours) -
• Proof Test Interval (in months) - T
• MTTR (in hours)
• Diagnostic Coverage
  • Switch 10%
  • Transmitter 50%
  • Solenoid 40%
  • XV 20%
• Logic Solver PFD = .001
• Process upstream upset: Every 3 months
• LV-2 MTTF: 12 years
• Operator error rate: 1 in every 100 attempts
• Exchanger bypass valve manipulation: Every two weeks
• Cooling water inlet valve operation: Every two years
• Knockout outlet pot valve operation: Every week
• Exchanger leak: Every 25 years
• LSH – 3 L: 5 MTTR: 16 T: 12
• MCC relay L: 0.381 MTTR: 8 T: 24

Problem: Calculate the PFD of the SIF as designed and to offer alternate SIF configurations that will meet the target SIL

By the end of the course all students should be able to successfully perform this exercise.

SIL Determination Leadership Workshop Diagram