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CC: Layer of Protection Analysis and Safety Integrity Level


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This is a combined course of Layer of Protection Analysis and Safety Integrity Level.


This is a combined course of:
  • Layer of Protection Analysis
    Layer of protection analysis (LOPA) is the newest methodology for hazard evaluation and risk assessment. On a sliding scale of sophistication and rigor, LOPA lies between the qualitative end of the scale (characterized by methods such as hazard and operability [HAZOP] analysis and what-if analysis) and the quantitative end (characterized by methods using fault trees and event trees). LOPA helps the analyst make consistent decisions on the adequacy of the existing or proposed layers of protection against an accident scenario. The decision-making process is ideally suited for coupling with a company’s risk-decision criteria, such as comparison to targets set by your company for controlling risk to as low as reasonably practicable (ALARP). Background and prior training in qualitative hazard evaluation methodologies (such as previous attendance at Process Hazard Analysis Leader training or the equivalent) are strongly recommended because LOPA builds on the skills and knowledge needed for hazard evaluations.
    1.2 CEUs, 1.2 COCs, 2.0 CMs, ABIH approval #10-241
  • Safety Integrity Level
    This course focuses on the principles involved in the design of high-integrity systems that conform to the requirements of ANSI SP 84 (formerly ISA 84.01) or control active pressure protection systems such as those allowed by ASME Code Case 2211. In this intensive 2-day course, you will learn how to evaluate the need for a high-integrity control system, evaluate potential system architectures, and analyze the system to determine its reliability characteristics.
    1.2 CEUs, 1.2 COCs, 2.0 CMs, ABIH approval #10-242
Duration: 4 days

Dates & Locations

View our current schedule of virtual or on-site courses at



Layer of Protection Analysis

Day 1: 8:00 a.m. to 5:00 p.m.
  • Fundamentals of Risk Judgment definitions
  • Relationship of Regulations and Standards
    • History of LOPA
    • Relationship of qualitative and quantitative risk judgment
  • Overview of LOPA
    • What is LOPA?
    • How does LOPA work?
    • Examples of industry variations on LOPA
  • Scenario Development
    • Starting with hazard evaluations
    • Design evaluations
    • Incidents
  • Consequences
    • Limiting definitions
    • Consequence categories
  • Initiating Events
    • Enabling conditions
    • Frequency categories
  • Independent Protection Layers: definitions, riles and examples
  • Calculations
    • Basics of worksheet calculations
    • Workshop: Scenario evaluations
Day 2: 8:00 a.m. to 3:00 p.m.
  • Case Studies and Workshop: Pulling it all together
  • Risk Tolerance Criteria
    • Examples
    • Development and implementation
    • Dealing with liability concerns
  • Special Applications; facility siting and safety interlocks with workshops


Safety Integrity Level

Day 1: 8:00 a.m. to 5:00 p.m.
  • OSHA and EPA regulations
  • CCPS guideline documents
  • ANSI SP 84
  • Developing the System Requirements
    • How to evaluate consequences of system failure
    • Layers of protection and LOPA
    • Safety integrity levels
    • Intrinsically safer design
  • Review of Principles of Reliability Analysis
    • Safety life-cycle concept
    • Availability, reliability, and dependability
    • Equipment failure modes
  • Introduction to Systems Architectures
    • Redundant vs. nonredundant systems
    • Voting systems
    • Computers and programmable logic controllers
Day 2: 8:00 a.m. to 4:00 p.m.
  • Design Concerns
    • Alarm problems
    • Maintenance (test intervals, online testing)
    • Human factors (man/machine interface)
    • Plant production environment
    • Power supplies
    • UPS
    • Power surge/lighting protection
    • Power quality to unit
    • Grounding
    • Static electricity
  • Good Practices
    • Single wire pulls
    • Fuses
    • Optical isolation
    • Fire fusible links
    • Spare parts
  • Workshop: Preliminary Specification of an Interlock System for a Toxic Chemical Storage Area – Preview of Coming Standards (IEC 1508)


Mr. Rick Curtis - Senior Risk Engineer, ABS Consulting

Mr. Scott Sandler - Senior Process Risk Consultant, ABS Consulting

John Farquharson - Senior Risk/Reliability Engineer, ABS Consulting

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