LOPA / SIL Determination

Another expertise of Green World is conducting of Layers of Protection Analysis (LOPA) risk assessment technique. This is most commonly used to determine the required Safety Integrity Level (SIL) for Safety Instrumented System (SIS) under specific standards (BS EN 61508 and BS EN 61511).

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LOPA / SIL Determination

Another expertise of Green World is conducting of Layers of Protection Analysis (LOPA) risk assessment technique. This is typically the newest methodology useful for defining the needed Safety Integrity Level (SIL) for Safety Instrumented System (SIS) as implied in certain standards (BS EN 61508 and BS EN 61511). Our professionals can team up with you and find out the required and most relevant IPLs (Independent Protection Layers), Identify Safety Instrumented Functions (SIF), and decide on appropriate target SILs for Sis, in order to accomplish SILs, we will validate the proposed or existing designs for SISs, ensure preparing the necessary documentation for the inspection that is going on, functional testing and maintenance of SISs, and will have a review on the current procedures and practices in the Functional Safety Management system for their compliance.

Green World has a team of professional consultants who have proven engineering skills in all matters relating to the approach and determination of appropriate target Safety Integrity Levels (SIL) for Safety Instrumented Functions (SIFs)

LOPA (Layer of Protection Analysis) Studies

A Layer of Protection Analysis (LOPA) Study is a method used in combination with other PHA techniques, specifically, HAZOP for finding out whether there are enough protection layers present against the identified high-risk occurrence or scenario. Moreover, it is also used to make sure countermeasures are taken in order to lessen the severity of the risk. In general, LOPA studies are also beneficial in identifying Safety Integrity Level (SIL) values which are needed for Safety Instrumented Functions (SIF) in Safety Instrumented Systems (SIS) to be in compliance with the IEC 61511 / ISA S84 standards.

Steps involved:

  • Analysis of Risk: Establish the needed risk reduction
  • Executing the risk reduction
  • Evaluating Functional Safety

Safety Integrity Level (SIL)

The Safety Integrity Level (SIL) Study is a formal methodology used to

evaluate the diverse levels for identifying the security integrity requirements of the security instrumented functions (SIF) which are to be assigned to the security instrumented systems. Layer of Protection Analysis (LOPA) methodology takes into account protective layers for preventing forestalling and mitigating hazardous occurrences through a concept of essential safe design for avoiding or reducing the outcomes of an unsafe happening.

What are the benefits of conducting SIL Study?

Functional safety is one of the cornerstones of any method plan security strategy for the Process Safety Management (PSM) program. It is therefore of great importance that the life cycle of Safety Instrumented Functions (SIFs), together with specification, design, validation, commissioning, and operation & maintenance, is in accordance with the necessities of the recognized practical safety standard: IEC 61508 or its sector-specific spin-off.

Typically, the SIL Study is categorized into three stages such as

  • SIL Identification
  • SIL Verification

  • SIL Validation

Green World Group meets the client’s needs on SIL identification along with SIL verification studies through its excellent in-house facility, software, and expertise.

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