Karl Watson, ABB Consulting Houston LOPA. A Storage Tank Case Study. ABB Inc. September 20, 2011 Slide 1
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1 Karl Watson, ABB Consulting Houston LOPA A Storage Tank Case Study September 20, 2011 Slide 1
2 Introduction Karl Watson PSM Consultant, ABB Consulting Based in Houston, US Chartered Instrument Engineer 24 years experience in Process Industry ICI Chemical and Polymers, ICI Engineering, ABB Consulting Specialist in Functional Safety
3 Outline of Presentation Storage Tank Case Study Simplified overview of SIL 3 Steps to SIL LOPA What you should consider Establish good practices Identification of improvements
4 Case Study Gasoline Storage Is this installation Safe? LHHH LI LHHA LHA LIA Manual ESD TI September 20, 2011 Slide 4
5 Functional Safety Standard - IEC61508 IEC61513 : Nuclear Sector IEC61508 Medical Sector IEC61511/ISA84 : Process Sector Simplify the process into 3 steps IEC62061 : Machinery Sector Set the Target Safety Integrity Level (SIL) Design to meet the Target SIL O&M to continue to meet the Target SIL
6 Step 1 Set the Target SIL Hazardous Event Loss of Containment due to overfill Flashfire No confinement, limited release before detection 1 Person in the area potential single fatality Company Tolerable Frequency 1E-05/yr (example only) LHHH LI LHHA LHA LIA Manual ESD TI September 20, 2011 Slide 6
7 What could cause this event? Failure of Level Indicator (0.1/yr) Maximum by IEC61511 Operator Error during filling (0.5/yr) 50 per year HEP 0.01 (from IEC61511) Operator Error before filling (0.5/yr) 500 per year Additional Checks HEP (from IEC61511) September 20, 2011 Slide 7
8 What Safeguards are in Place? Alarms (PFD=0.1) Local Operator (PFD=0.5 stressed) Ignition (Probability=0.1) Occupancy (Probability=0.05) Vulnerability (Probability=0.5) LHHH LI LHHA LHA LIA Manual ESD TI September 20, 2011 Slide 8
9 Check for Dependent Failures? Failure of LI may prevent alarms from operating Double counted occupancy and an local operator response LHHH LI LHHA LHA LIA Manual ESD TI September 20, 2011 Slide 9
10 LOPA SIL Calculation Example Only September 20, 2011 Slide 10
11 Step 2 - Designed to meet the SIL Level Switch Relay Logic 3 Inlet Valves Equipment λ d (failures/yr) Level Switch failure in 20 yrs Relay Logic failure in 100 yrs Valves 3 * = failure in 30 yrs Total 0.16 PFDavg = ½ * Σλ d * Test Interval (in years) For test interval of 3 months (0.25/yr) PFDavg = ½ * 0.16 * 0.25 = 0.02 (Target 0.02) September 20, 2011 Slide 11
12 Step 3 O&M to Continue to meet the SIL September 20, 2011 Slide 12
13 Gasoline Storage Is this installation Safe? LHHH LI LHHA LHA LIA E-Stop TI September 20, 2011 Slide 13
14 Gasoline Storage Is this installation Safe? LHHH LI LHHA LHA LIA Manual ESD TI September 20, 2011 Slide 14
15 LOPA What makes an Effective Risk Assessment Good method to identify potential causes Where do the numbers come from Published values Operational experiences LHHH LI LHHA LHA LIA Manual ESD TI September 20, 2011 Slide 15
16 Hazardous Event Test potential consequence VCE not thought credible Small release Confinement / weather Operation data indicates credible scenario Fill rates Likely duration September 20, 2011 Slide 16
17 Initiating Events Failure of Level Indication (0.1/yr) Actually failed 14 times in the last 4 months. No formal systems to record failure. Lack of Awareness of Potential Consequence Failure of control, generally leads to process alarms Bad Practices - Alarms or Fill Setpoints? LHHH LI LHHA LHA LIA Manual ESD TI September 20, 2011 Slide 17
18 Initiating Events Operator Errors HEP (trained, no stress) Under stress ( ) Consider. Only 1 screen available Limited information available Which lines flowing Flowrate Handover Operation Pressures Reality check against operation experience September 20, 2011 Slide 18
19 Protection Layers Alarms Need for independence Indication and filling stops Independent alarms HEP For 0.1 we must have Clear, identifiable alarm Time to respond Minimum 30 minutes for field actions Clear independent action No management of changes for settings September 20, 2011 Slide 19
20 Typical LOPA Improvements Level Indication Unacceptable failure frequency Automated stops Independent check Operating Procedures / Awareness Remove the practice to fill to alarms Improve filling visualization Alarms Need to be independent of the filling process Must be clear with independent action Alarm levels fixed based on maximum fill rate and time to respond September 20, 2011 Slide 20
21 Summary Poor application of LOPA can lead to miscomprehension that you have sufficient safeguards in-place to protect against your potential hazardous events Operational experience should be used as a basis of decisions Applying LOPA effectively should Identify weaknesses in your work processes Show if your perceived safeguards are adequate Identify improvements to reduce areas of higher risk LOPA is a good technique provided it is applied correctly. Remember This is only the first stage in the lifecycle September 20, 2011 Slide 21
22 September 20, 2011 Slide 22
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