Marie Baker - Lloyd`s Register Energy Blog

Safety Driven Performance 2013
Developing and Maintaining Relief
System Design Documentation as an
Evergreen Process
Marie Baker
Relief System Optimization Technical Manager
Lloyd’s Register Energy America’s, Inc.
• Overview of 29 CFR 1910.119 – How this standard applies to
relief systems
• Relief system design documentation methodology – Benefits
of using a system based approach for relief systems
• Developing an evergreen process – The importance of an
evergreen process for relief systems
• Optimization of relief system design documentation – Helpful
hint for optimizing data
29 CFR 1910.119 – Process Safety Management of
Highly Hazardous Chemicals
• Intended to prevent or minimize consequences of
catastrophic releases of toxic, reactive, flammable or
explosive chemicals
• Applies to facilities that meet the following requirements:
• Process involving a chemical at or above the specified threshold
quantities listed in appendix A
• Process involving a flammable gas or liquid with a flashpoint below
100 °F on site in a quantity of 10,000 pounds or more
29 CFR 1910.119 – 14 Elements of Process Safety
Employee participation
Process safety information
Process hazard analysis
Operating procedures
Pre-startup safety reviews
Mechanical integrity
Hot work permit
Management of change
Incident investigation
Emergency planning and
• Compliance audits
• Trade secrets
29 CFR 1910.119 (d) – Process Safety Information
• Highly hazardous process chemical information
• Physical data
• Toxicity information
• Process technology information
• Block flow diagram/Process flow diagram (PFD)
• Process chemistry
• Safe upper/lower limits
• Process equipment information
• Process & instrumentation diagrams (P&ID)
• Equipment design codes and standards
• Relief system design and design basis
What is Relief System Design Basis
• Relief system design basis – documents how the loads and
sizes of the relief system were determined
• Includes but not limited to:
• Overpressure scenarios
• Relief load calculations
• Assumptions
Relief System Documentation Methodology – System
based approach
• System based approach is the preferred methodology
• System comprised of:
• Protected equipment
• Interconnected piping
• Relief device(s)
• Relevant equipment included in documentation
Pressure sources
Inlet control valves
Restriction orifices
Locked open/closed valves
Benefits of System Based Approach
• All equipment is evaluated
Pressure Vessels
Heat Exchangers
• Captures equipment without overpressure protection
• Presents a total picture of the system
System Based Approach - Example
Relief System Documentation Methodology
• Overpressure Scenario Evaluation
• Includes all systems, protected and unprotected
• All scenarios evaluated for each system
• Rationale provided for each
• For all credible overpressure scenarios
• Calculations performed
• Required relief load
• Required orifice area
• Inlet and outlet pressure drops
• Any assumptions should be documented
Recommended Relief System Documentation
• API 521 recommended documentation
Protected equipment information
Overpressure scenario analysis
Relief conditions
Relief device manufacturer/model
Relief load calculations
Effluent location
Benefits of Relief System Documentation Process
• Consistent documentation
• Following same standards/guidelines on all projects
• All equipment is evaluated
• Protected and unprotected
• Information is detailed
• Scenario rationales fully explained
• Calculations included
• Assumptions stated
Benefits of Relief System Documentation Process
• Current information available to the facility
• Process Hazard Analysis (PHA)
• Hazard and Operability (HAZOP)
• Turnaround (TAR) planning
• Internal and external audits
Steps to Evergreen the Relief System Documentation –
Step 1
• Define/develop baseline for relief system design
• Revalidation
• Partial or full
• Recommended when documentation is scarce at a facility
• Gap analysis
• Based on overpressure scenarios
• Based on documentation
• Design verification
Steps to Evergreen the Relief System Documentation –
Step 2
• Develop a process for updating the relief system design basis
• Who will be responsible for relief system documentation
• In-house group or third party contractor
• How information will get to the responsible group
• How and where information will be stored
• Electronically or paper copies
• Central location or multiple copies spread throughout facility
• When will relief systems group be brought in on projects
• Who will have access to the information and to what extent
Steps to Evergreen the Relief System Documentation –
Step 3
• Implement the process and continually improve on it
• Workflow process written in detail
• Look for ways the process can be more efficient
• Who is responsible for keeping up to date on new standards
Optimizing Relief System Design and Documentation
• Master system files stored as PDF electronically
• Limits access for unauthorized changes
• Provides venue for anyone needing the information
• Can easily be viewed in meetings
• Utilizing database software
Provides storage of data
Various software available depending on facility requirements
Software can provide users with different levels of accessibility
Information is searchable by plant personnel
Specific information can be easily extracted
Any questions?
Safety Driven Performance Conference 2013
For more information please contact:
Marie Baker
Relief System Optimization Technical Manager
Lloyd’s Register Energy Americas
1330 Enclave Parkway, Suite 200
Houston, TX 77077
+1 281 649 2781
[email protected]

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