Following the Hazards and Risk Assessment, the IEC 61511 safety lifecycle model requires that identified SIFs are assigned a target measure of their reliability to perform the safety function.
Customer Challenges
Hazard and risk assessment is required by PSM (Process Safety Management) regulation all over the world. Unfortunately, the methodology for hazard and risk assessment is different from consultant to consultant and poorly facilitated HAZOP methodology results in insufficient safeguards and poor safety design. Government regulators throughout the world place huge importance on hazard and risk assessments and may prosecute end-users where incidents are as a result of missing scenarios during HAZOPs. Hazard and risk assessment reports should reflect all hazard scenarios and should be updated regularly to include latest scenarios based on equipment failure records and incident investigation reports to prevent the incidents by similar causes.
Our Solution
- Yokogawa Functional Safety Experts apply the most comprehensive and stringent HAZOP methodologies under the framework of IEC61882. They are skilled in both cause-first sequence’ HAZOPs and ‘deviation-first sequence’ HAZOPs. Based on past observations, the former methodology is better in avoiding missing scenarios leading to a safer design.
- Yokogawa Functional Safety Experts work closely with the site plant engineers. All aspects of the safety process are scrutinized node-by-node, to identify hazard and operational issues. During this critical assessment, safeguards including safety instrumented functions (SIF) are identified and recorded for each of the situations.
Customer Benefits
Yokogawa utilizes field experienced Functional Safety Experts, who are skilled in systematic hazard identification methods, to ensure all potential hazards in the process plant are identified. Strict HAZOP methodology provides the simple review of alarm response action in standard operation procedure (SOP), the review of process design, the reinforcement of safeguards and the discovery and the correction of inaccuracies on P&ID, etc.
Upon completion of the Hazard and Risk Assessment clients are provided with a report detailing the following information which can be submitted to relevant authorities to meet PSM obligations.
- An overview of all possible unwanted disturbances and their initiating events.
- Determination of existing or new SIFs and other safeguards for each hazard.
- Documentation of the HAZOPs results and justification for Safety Functions.
- Action planning for improvements of the process or required clarifications.
- Yokogawa safety consultants work with the Process Hazard Analysis (PHA) tool (e.g. PHA-Pro or Yokogawa in-house/client templates) to create reports that comply with IEC 61511 and IEC 61882 requirements. The PHA-Pro template can be customized to suit client needs. The HAZOP report can also be exported in various format such as CSV, PDF or Doc for documentation and further usage for other process safety activity. Further to that, the HAZOP results can be seamlessly transfer to LOPA phase and SRS phase using the same tool thus improving efficiency and reduce human error.
More information is available by clicking the link "Sustainable Safety Lifecycle Solution" at the upper right corner of this page. - Yokogawa’s HAZOP template provides a graphical snapshot of statistics for all scenarios for ease of analyzing data.
- Yokogawa safety consultants provide high quality consulting with practical knowledge about instruments and process.
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