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SIL

The combination of HAZOP and SIL methodologies is used to achieve the safety integrity level of a system or process through safety loops of the safety instrumented system. HAZOP study results help determine the target SIL level required for adequate reduction of identified hazards to an acceptable level.

We offer services for assessing the target safety integrity level (SIL) in safety loops of SIS systems using Risk Graph and LOPA (Layer of Protection Analysis) methodologies in accordance with GOST R IEC 61511-3-2018.

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What is SIL?

Safety Integrity Level (SIL) is a measure used to determine the safety level of a functional system. It is particularly important for systems related to the management and control of hazardous processes in the oil and gas, petrochemical, refining, and energy industries.

SIL is determined based on the probability of a hazardous event occurring and its potential consequences. It is a quantitative measure ranging from SIL 1 (low risk reduction) to SIL 4 (high risk reduction).

Safety Integrity Level (SIL) is an important aspect in the field of functional safety systems and helps ensure that risks associated with hazardous events are minimized to an acceptable level. It also provides standardization and consistency in safety systems.

SIL Process

Determining the SIL level involves the following steps:

  1. Hazardous event identification: Potentially dangerous situations are identified, such as emergency situations, explosions, etc.
  2. Functional system analysis: The functions and tasks of the system are determined, defining how it controls, prevents, or limits the possibility of a hazardous event occurring.
  3. Assessment of hazardous event probability: Analysis is conducted to determine the probability of a hazardous event occurring, as well as its potential consequences should it occur.
  4. SIL determination: Based on the assessment of probability and consequences of the hazardous event, the appropriate SIL is determined.
  5. Development and implementation of safety measures: Measures are taken to ensure the safety integrity of the functional system in accordance with the requirements defined for the SIL.
  6. Testing and verification: Testing and verification of the system is conducted to ensure it meets the specified safety requirements.