Processes, especially those in oil&gas and chemical plants, involve major hazards with significant potential to cause human losses and harm to assets or environment.
Safety Instrumented Systems (SIS) play a significant role within the process industry as their purpose is to reduce the risk of these hazards to a tolerable level.
Through the years of experience in design and implementation of safety instrumented systems, as well as by continuous education of our specialists, we have gained expertise which we can share with our clients by providing the assistance in this demanding and nowadays critical discipline.
In addition to providing safety instrumented systems design according to IEC 61511 standard, our functional safety consultants (TÜV certified) can offer you the following services:
Leading of Process Hazard Analysis studies (applying HAZOP method)
Leading of SIL assessment studies (applying Risk Graph or LOPA methods)
SIL verification activities
Preparation of Safety Requirements Specifications
Verification of SIS design done by other engineering companies
SIS maintenance consultancy
Custom safety trainings
Hazard and operability studies
for process plants
The Hazard and Operability (HAZOP) study is the most widely used Process Hazards Analysis (PHA) technique in the chemical, pharmaceutical, oil and gas, nuclear, and other process industries worldwide.
HAZOP is used during the design stages of a new process or project, for major process modifications, and for periodic review of existing operations. Many regulators around the world, recognizes the HAZOP technique as an acceptable methodology for evaluating risk.
HAZOP is a structured and systematic examination of a process or operation in order to identify and evaluate problems that may represent risks to personnel, the environment or equipment, or prevent efficient operation. The analysis session, which involves a multidisciplinary team, is aimed at identifying potential deviations from expected conditions, analyzing their possible causes in every single part of the system.
SIL Assessment (IEC 61508/61511)
and Verification
The need to improve reliability, the increasing failure tolerance and the standardization of technical safety systems led to the development of the SIL concept.
The acronym stands for Safety Integrity Level, which represents the level of risk reduction required by a safety instrumented function within the implementation of a Safety Instrumented System (SIS) for a specific process. Practically, the SIL identifies the integrity level that must be associated to safety instrumented functions (SIF), according to the specific risk of the system. The SIL assessment is a systematic analysis developed by a team of professionals and based on risk: it identifies the integrity requirements for every safety function.
The SIL VERIFICATION consists in applying specific mathematical models to verify the PFD (Probability of Failure on Demand) of the safety function, to make sure that it meets the specific integrity requirements