Project Synopsis

Selection of Safety Integrity Levels (SILs) within a refining or petrochemical process Safety Instrumented System (SIS). Incorporation of these SILs into the clients PSM/RMP program.

Project Summary

SAFETY INTEGRITY LEVEL (SIL) SELECTION ANALYSIS
FOR SAFETY INSTRUMENTED SYSTEMS (SISs) OF
REFINERY AND PETROCHEMICAL PROCESSES

Typical Project Description

On numerous occasions, Process Engineering Associates, LLC (PROCESS) has provided engineers experienced in process safety, risk management, and SIL selection who were part of SIL selection analysis teams for the clients.  The teams assigned SILs to the safety instrumented functions of specific safety instrumented systems of petroleum refining and petrochemical processes to help the clients incorporate the SIL selection requirements of the American National Standards Institute (ANSI)/Instrumentation, Systems, and Automation Society (ISA) standard 84.00.01 – 2004 into their Process Safety and Risk Management Program.  PROCESS worked with each client to develop the qualitative risk ranking matrix used in the qualitative SIL selection methodology. Various methodologies were employed for the SIL selection analyses, including layer of protection analysis (LOPA) and a qualitative risk ranking methodology.

PROCESS performed SIL selection analyses for the safety instrumented systems on the following specific processes:

  • Acrolein Manufacturing Plant
  • Amine Treaters
  • Boiler Systems
  • Butamer Unit
  • Cat Light Ends Unit
  • Catalytic Polymerization Unit
  • Catalytic Reforming Unit
  • Crude Unit
  • Delayed Coker Unit
  • Flare Unit
  • Fluidized Catalytic Cracking (FCC)/Gas Concentration (Gas Con) Units
  • Gas Oil Hydrotreating Unit
  • Gas Treating Unit
  • HF Akylation Units
  • Hydrogen Plants
  • Kerosene Hydrodesulfurization Unit
  • Light Distillate Hydrotreating Unit
  • Mild Hydrocracker Unit
  • Mobile Source Air Toxics (MSAT) Project for an Isomerization Unit
  • Naphtha Hydrotreating Unit
  • Pentane/Hexane Isomerization Unit
  • Refinery-wide SIL selection analysis
  • Saturates Liquids Units
  • Sodium Hydrosulfide (NaHS) Unit
  • Sour Water Stripper Unit
  • Sour Water Ammonia to Ammonium Thiosulfate (SWAATS) Unit
  • Sulfur Recovery Units
  • Tailgas Treating Units
  • Ultra Low Sulfur Diesel (ULSD) Unit
  • Vacuum Unit
  • Vapor Recovery Units
  • Various proprietary batch chemical processes

 

Industry Type

  • Petroleum Refining
  • Petrochemicals

Utilized Skills

  • SIL selection analyses
  • Layer of protection analysis (LOPA)
  • Qualitative risk ranking
  • Process Safety Management program administration
  • Risk Management Plan program administration
  • Regulatory requirement knowledge

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