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Establishing Integrity Operating Windows (IOWs) IPEIA Conference February 2, 2006 Banff, Alberta John Reynolds Steamboat Springs, CO, USA Recently retired.

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Presentation on theme: "Establishing Integrity Operating Windows (IOWs) IPEIA Conference February 2, 2006 Banff, Alberta John Reynolds Steamboat Springs, CO, USA Recently retired."— Presentation transcript:

1 Establishing Integrity Operating Windows (IOWs) IPEIA Conference February 2, 2006 Banff, Alberta John Reynolds Steamboat Springs, CO, USA Recently retired from Shell Global Solutions (US) Inc.

2 2 Outline for this Presentation The 10 Shell (US) Process Safety Initiatives (PSI) The Pressure Equipment Integrity (PEI) Initiative Corrosion Control Documents (CCD) Integrity Operating Windows (IOW) Standard and Critical IOWs Integration of IOWs into the 10 PSIs Training of Operators on IOWs The Pressure Equipment Integrity Pyramid

3 3 Ten Process Safety Initiatives (PSI) – Initiated in May, 2000 Pressure Equipment Integrity (PEI) - IOW creation process Ensure Safe Production (ESP) - IOW monitoring process Operator Training and Procedures - IOW knowledge transfer Management Of Change (MOC) - IOW change process Investigations – 3 Levels up to RCA Protective Instrument Systems (IPF – SIL) Reliability Centered Maintenance (RCM) Causal Learning Audits and Assessments Process Hazards Analysis (PHA)

4 4 Process Safety Initiative Metrics Each of the 10 PSIs were required to have four main metrics to track implementation progress (10 X 4 = 40 metrics total) For the PEI process safety initiative we tracked: - Numbers of Corrosion Control Documents (CCDs) completed - Numbers of process units with RBI completed - Numbers of process units with all IOWs implemented - Numbers of operators trained on their CCD & IOWs But there was only one bottom line metric for the aggregate of the ten process safety initiatives –> numbers of process safety incidents per year

5 5 Results of the Process Safety Initiatives Numbers of Process Safety Incidents in last 6 years – A real success story

6 6 Primary Aspects of the Pressure Equipment Integrity (PEI) Initiative Identify all necessary Integrity Operating Windows (IOWs) Create OEMI Teams (Operations - Engineering - Maintenance - Inspection) in each operating area to create and manage CCDs and IOWs Create Corrosion Control Documents (CCDs), which document all process IOWs Train operators on the CCD and IOWs Implement IOWs and Risk-Based Inspection (RBI) Implement PEI Focused Asset Integrity Reviews (FAIR ® ) to monitor progress of the PEI Initiative

7 7 ESP RBI CCDs & IOWs OEMI Teams 101 Essential Elements PEI PSI Pyramid

8 8 Corrosion Control Documents – Contents Relatively comprehensive documents for managing equipment degradation Description of the process unit and process conditions Shutdown and start up conditions that may affect corrosion and degradation mechanisms, as well as normal operation Process Flow Diagram (PFD) and Materials and Corrosion Diagram (modified PFD showing construction materials) Corrosion Control Loops (areas of similar corrosion within the PFD) e.g. overhead system, slurry system, reflux system, etc. All potential types of degradation (and fouling) in each process unit and history of problem areas Quantitative and predictive models for degradation mechanisms Vital corrosion control procedures, injections, inhibitors, etc. Recommended inspection & corrosion monitoring, process changes, construction materials changes, etc. Integrity Operating Windows (IOWs)

9 9 Corrosion Control Documents – Construction Unit specific CCDs completed by an OEMI team which includes: - Site corrosion engineer/specialist - Unit process engineer - Unit inspector - One or more experienced unit operations representatives - Facilitator (knowledgeable / experienced corrosion engineer) Final document represents an agreement between the OEMI Team involved and clearly benefits by the synergistic interaction of all team members

10 10 Establishing Integrity Operating Windows Historical operating, maintenance & inspection records Design data; lab data; operating data Metallurgical and corrosion data and modules Process chemistry and engineering knowledge Reactive chemistry knowledge Recommended practices (industry and company) Process and corrosion modeling tools Subject matter expertise and experience (heavy dose) Result: Reasonable, practical IOWs – not too conservative – not non-conservative

11 11 Integrity Operating Windows Operating Window

12 12 Integrity Operating Windows – Examples Typically fall into 2 categories: Physical - Various limits on pressures and temperatures, including design, operating, partial pressures, dew points, dry points, heating and cooling rates, delta P, etc. - Flow rates, injection rates, inhibitor dosage, amperage levels on Alky contactor motors, slurry content, hydrogen flux, vibration limits, corrosivity probes, etc. Chemical - pH, water content, acid gas loading, sulfur content, salt content in crude, NH 4 HS content, NH 3 content, TAN, acid strength, amine strength, inhibitor concentration, chloride contamination levels, oxygen content, etc.

13 13 IOW Example – Hot Hydrogen Service Mechanical design window set by the design code e.g. ASME IOW set by material limit for high temperature hydrogen attack in API RP 941 SOR process temperature definitely within the IOW EOR process temperature possibly beyond the IOW – need to know the hydrogen partial pressure and duration of EOR conditions Temperature Pressure Mechanical Design Limits SOR Process Temp EOR Process Temp IOW Based on H2 ppBased on Total Pressure

14 14 Integrity Operating Windows – Typical Numbers per Operating Unit (before & after an intensive review) Typically start with 5 -10 IOWs that may already be in place, along with other operating quality variable limits Typically end up with 30 – 50 IOWs with about 5 -10% being critical limits (requires drastic and/or immediate action), and the rest being standard limits (requires attention within a specified timeframe to get back into control)

15 15 Definitions: IOW Critical Limit A limit at which the operator has one last opportunity to return the process to a safe condition and, if exceeded, could result in one of the following in a fairly short timeframe: A Catastrophic Release of Hydrocarbons or Hazardous fluids Loss of Containment Non-orderly Shutdown Significant Environmental Impact Other Unacceptable Risk

16 16 Critical IOW Limit – Examples Boiler Feed Water Level - Lost of boiler feed water level could quickly cause boiler tube rupture Hydroprocess Reactor Temperature - Metal temperatures below the MDMT could give rise to brittle fracture Heater Tube Skin Temperature - Tube could rupture quickly if overheated, caused, for example, by a no flow or hot spot condition. Sulfuric Acid Strength in Alkylation - Too low acid strength could cause runaway reaction

17 17 Definition: Standard Level A limit that, if exceeded over a defined period of time, could cause one of the following to eventually occur: A catastrophic release of hydrocarbons or hazardous fluids Loss of containment Non-orderly shutdown A negative impact to the long term unit performance and its ability to meet turnaround run length Excessive financial impact

18 18 Standard Level Examples REAC NH 4 HS Concentration - Corrosion of the air cooler and downstream piping Heater Tube Skin Temperature - Metallurgical creep could lead to eventual tube failure. Crude Fractionator Dew Point Temperature - Sustained operation below dew point could cause damage to fractionator internals or potential loss of containment. pH of Crude Tower Overhead - Sustained operation below standard pH level could lead to corrosion of tubing and piping and potential loss of containment. Desalter Outlet Salt Content - Sustained operation above standard level could lead to corrosion and potential loss of containment

19 19 Integrity Operating Windows – Successes In the CCD review, one IOW team noticed that a previous project had installed the wrong construction materials – immediate inspection revealed significant HTHA damage An operator on the team disagreed with the unit process engineer and said that we actually operate much hotter than you think because we use the by-pass – immediate inspection revealed significant localized damage A corrosion engineer questioned the higher level of NH 4 HS in the REAC system of an HCU – immediate inspection revealed a previously-missed localized spot of significant corrosion An IOW was set on NH 4 HS concentration at another refinery, which then began to take routine lab samples – soon thereafter discovered the concentration was too high and took steps to increase wash water and adjust feedstock

20 20 Operator Training on CCDs and IOWs Level 1 - Awareness and Overview of the PEI Process Safety Initiative - SSA Video / CCD / RBI / OEMI / Operator Training Level 2 - Introduction to Corrosion Control Documents - What they contain; where theyre stored; how to use them Level 3 - Details contained within each operators unit-specific CCD - Specific IOWs and the reasoning behind them - What can happen if the IOW is exceeded

21 21 ESP RBI CCDs & IOWs OEMI TEAMS 101 Essential Elements PEI PSI Pyramid

22 22 Implementing Risk-Based Inspection (RBI) Another major part of our pressure equipment integrity process safety initiative We use both a Shell developed more qualitative RBI (S-RBI), as well as the more quantitative API RBI, both successfully for different needs at different sites But RBI will not be covered today – a topic for another day, if you like Suffice it to say that any inspection program, be it risk-based, condition-based, or time-based may not be fully reliable without effective identification and implementation of integrity operating windows (IOWs)

23 23 Integration of CCDs, IOWs & RBI Confidence in plant integrity Creating the CCD: Type of degradation Location of degradation Susceptibility to degradation Degradation rates IOW limits: Determination & management of the operating limits to avoid degradation RBI planning: Method of inspection Where to inspect Frequency of inspection Feedback

24 24 Integration of Multiple Work Processes Leading To Sustained Asset Integrity Design and Materials Selection Corrosion Control & IOWs Risk-Based Inspection Long Term Asset Integrity Asset integrity management is a balancing process designed to achieve lowest total cost of ownership Focused Asset Integrity Reviews

25 25 Along with Asset Integrity Comes Proven Better Process Safety Performance Numbers of Process Safety Incidents in last 6 years in Shell (US) Refining Operations – Facts, not just hopes for the future

26 26

27 27

28 Shell Experience with Integrity Operating Windows (IOWs) Time for Discussion Recently retired from Shell Global Solutions (US) Inc.

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