Layer of Protection Analysis (LOPA) - New Zealand

Date From: 23 October 2018
Date To: 24 October 2018
Location: New Zealand
Description: Covers the basic methodology of LOPA and the detailed stages of its application. Participants are shown how to identify significant scenarios, estimate frequencies for the worst-case events and how to assign risk categories.
Event Type: IChemE Course
Venue: Hamilton, New Zealand
Organiser: IChemE
Contact Name: Natalie Graser
Contact Phone: +61 (0) 3 9642 4494
Contact Email:

Book Event

Alternative dates and locations

18-19 June 2018, Melbourne


Learn the latest process risk assessment technique for process control

Layer of protection analysis (LOPA) is a semiquantitative tool for analysing and assessing risk on a process plant. It uses an order of magnitude technique to evaluate the adequacy of existing or proposed layers of protection against known hazards. LOPA typically builds on the information developed during a qualitative hazard evaluation, such as a process hazard analysis (PHA), and can be used to meet the risk assessment requirements of IEC 61508 and 61511 standards.

This course covers basic and more advanced methodology of LOPA and the detailed stages of its application. Participants are shown how significant scenarios are categorised and tolerable frequencies assigned for identified hazardous events. They are shown how to assign risk categories and therefore determine the number of independent protection layers (IPLs) that should be in place. The specification and requirements for a protection layer to be accepted as an IPL are discussed. All the essential steps in this method are practised in workshops, including the use of software tools in LOPA.

Learning outcomes

  • the basic methodology of LOPA
  • how to decide if a process needs a safety instrumented system (SIS)
  • if yes, what safety integrity level (SIL) does it need?
  • how to define an independent protection layer (IPL)
  • how to implement a process to manage these systems through the life cycle of an installation

Who will benefit

  • production engineers
  • process design engineers
  • project engineers
  • process programmers and instrument control designers

Course outline

Day 1

  • history and methods
  • LOPA methodology, other methods,matrices and charts
  • what do the competent authorities expect?
  • scenarios
  • severity estimation and targets
  • initiating events and frequencies
  • conditional modifiers
  • independent protection layers

Day 2

  • other safety-related protection systems
  • 'aggregation' of scenario frequency when there is more than one initiator
  • example spreadsheet tools for study
  • addressing ALARP
  • uncertainties and sensitivities
  • documentation
  • cautions on using LOPA
  • when LOPA is done – managing/operating a safety instrumented system


  • IChemE member: NZD$2470 (inc. GST)
  • Non-member: NZD$2755 (inc. GST)


Discounts are available to companies booking more than one place:

  • 2 places – 5% discount
  • 3 places – 10% discount
  • 4 or more places – 15% discount


Multiple places must be booked at the same time to qualify.

Course presenters

Paul Feltoe, FIChemE, Director Safety Solutions

Paul Feltoe is a qualified Chemical Engineer with professional status in New Zealand and the United Kingdom. Paul has over 20 years of global experience in the Refining, Oil & Gas, Petrochemical and  Dairy Industries.

He is an experienced facilitator and trainer and has chaired numerous large process safety reviews and worked with a number of large organisations to close their process safety gaps.

He is a fellow of IChemE, a Professional Process Safety Engineer and a TÜV certified functional safety engineer.

Duration for CPD recording purposes: up to 11.5 hours.

If you are recording mandatory CPD you should refer to your own regulator’s requirements as recognition of CPD hours may vary.

IChemE member? Log your CPD via mycareerpath >>


IChemE is a registered charity in England & Wales (214379), and a charity registered in Scotland (SC 039661).