本标准的目的是提供以下信息:（a）风险的基本概念以及风险与安全完整性的关系（见第a.4条）；（b） 可容忍风险的确定（见附录K）；（c） 确定安全仪表功能（SIF）安全完整性等级（SIL）的多种不同方法（见附录B至K）；以及（d）多个安全系统对确定实现预期风险降低能力的计算的影响（见附录J）。

The objective of this Standard is to provide information on - (a) the underlying concepts of risk and the relationship of risk to safety integrity (see Clause A.4); (b) the determination of tolerable risk (see Annex K); (c) a number of different methods that enable the safety integrity level (SIL) for the safety instrumented functions (SIF) to be determined (see Annexes B through K); and (d) the impact of multiple safety systems on calculations determining the ability to achieve the desired risk reduction (see Annex J).