Functional Safety Studies

Alinoz have association with certified functional safety experts, who have significant experience in conducting the following functional safety studies in compliance with IEC 61508 / 61511.

Safety Integrity Level (SIL) is a measurement of performance required for a safety instrumented function (SIF). SIL assignment is based on the amount of risk reduction that is necessary to mitigate the risk associated with the process to a tolerable level. Four levels of SILs are defined, SIL 4 has the highest level of safety integrity and SIL 1 has the lowest.


To assess the integrity level for all instrumented protection functions that have been provided for all process systems through a SIL Assessment Workshop, in accordance with IEC 61511 and to verify through SIL Verification calculations that the design meets the integrity levels.

SIL Verification determines the design process of SIF. The SIF design is verified whether it meets functional and integrity requirements.


To verify whether the design of the automated safety system is adequate.

The Safety Requirements Specification (SRS) is intended to bring together all the information necessary to make sure that any SIS provides the right level of performance and risk reduction.


The main purpose with the safety requirement specification is to identify and present the safety requirements for the Safety Instrumented Functions.

SISs take the process to a safe state when predetermined conditions are violated, such as set points for pressure, temperature, level, etc. In other words, they trip the process when they detect an out-of-limit condition. Other terms commonly used for SIS includes Emergency Shutdown System (ESD, ESS), Safety Shutdown System (SSD), and Safety Interlock System (SIS). These systems are often automated but can also involve human action in response to alarms.

SIL Validation method aims to determine if the stipulated requirements can be achieved as stated in the safety requirement specification.


The objective of the requirements of this stage is to validate, through inspection and testing, that the installed and commissioned safety instrumented system and its associated safety instrumented functions achieve the requirements as stated in the safety requirement specification.

Activity performed by a competent senior engineer to determine if the safety system does meet the specification and actually achieve functional safety (freedom from unacceptable risk). This assessment is an important part of reducing systematic failures. It must be performed at least after commissioning and validation but before the hazard is present.

Our chairpersons have experience of conducting Re-Validation HAZOP for existing facilities.

Our Chairpersons are approved by leading operating companies such as ADNOC, QP, QG, PDO, TOTAL, BP, SHELL etc.

Our in-house scribing engineers, have excellent process safety knowledge and scribing skills.