Safety Integrity Level (SIL)

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The Safety Integrity Level (SIL) is the discrete level for specifying the integrity requirements of safety functions to be allocated to electrical and electronic safety related systems.
Process plants are operated with many sophisticated process control systems. These systems are required for safe and reliable operation of the plant and address safety functions such as process sectioning, fire and gas detection, process protection and blow down. These safety functions are often designed combining various E/E/PES technologies and other external risk-reducing devices. In addition, computer and software intensive systems are increasingly being used as part of the system.

Our solutions
VELOSI uses a number of techniques assisted by software to manage safety critical equipment. These cover three phases:

  1. Design
  2. Maintenance planning
  3. Operation & Monitoring

VAIL-SIL is an in-house developed Safety Integrity Level calculation tool with unique and versatile capabilities. This software was developed by using the Standard ANSI/ISA S84.01, IEC – 615011 and IEC – 61508 as reference documents. Various methodologies are available for assessment of target SILs.

VELOSI implements three different methodologies:

  • Layer of Protection Analysis (LOPA)
  • Risk Matrix
  • Risk Graph

VAIL-SIL is not limited to calculating targeted SILs alone - it includes:

  • Dynamic SIL reporting
  • Comparison summary with respect to all three mentioned methodologies
  • Target PFD calculation
  • Testing interval calculation
  • Mean Time Between Failure (MTTR)
  • Mean Time To Repair (MTBR)
  • SIL Study Session Team’s record management

Benefits
By utilizing VELOSI’s SIL managing techniques and software you can optimize the management of your safety critical systems and instrumented protective functions in line with the industry’s best practices without compromising safety.