Collection and Utilization of process safety metrics is an important tool for driving improved safety. Tier 3 leading indicators (challenges to safety system) indicate failures of process safety management systems and highlight areas that should be improved to prevent a more serious event. Safe Operating Limit (SOL) exceedances are a commonly used Tier 3 leading indicator. Surprisingly, there are many different approaches used in industry to calculate safe operating limits and to apply them. This inconsistency potentially diminishes the usefulness of SOL exceedances as an effective indicator. This paper discusses current industry practices around the determination and application of safe operating limits as established by a recent benchmark survey of over 150 safety practitioners from around the world. Areas explored in the survey of SOLs include; methodology for calculating, how / where information is stored, how / when established values are reviewed and audited, usage as a Process Safety Management Leading indicator, integration with operations (training, documentation), identification and tracking of when exceedances have occurred, and actions taken on exceedance. Key results and conclusions will be presented as well as recommendations on where industry should focus on improvement.

中文翻译：

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不要让您的安全操作限制离开您 SOL（运气不好）

过程安全指标的收集和利用是推动提高安全性的重要工具。第 3 层领先指标（对安全系统的挑战）指示过程安全管理系统的故障，并突出显示应改进以防止更严重事件发生的领域。安全操作限制 (SOL) 超标是常用的 Tier 3 领先指标。令人惊讶的是，工业中有许多不同的方法来计算和应用安全操作限制。这种不一致可能会削弱 SOL 超标作为有效指标的有用性。本文讨论了当前的行业实践，围绕安全操作限制的确定和应用，这是最近对来自世界各地的 150 多名安全从业者进行的基准调查确定的。SOL 调查中探索的领域包括：计算方法、信息存储方式/位置、审核和审核既定值的方式/时间、用作过程安全管理领先指标、与运营（培训、文档）集成、识别和跟踪何时发生超标以及采取措施采取超越。将提出关键结果和结论，并就行业应重点改进的领域提出建议。