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Crediting check valves as IPLs? Testing protocol to better understand check valve reliability

机译：作为IPLS汇票检查阀门？测试协议以更好地理解止回阀可靠性

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摘要

Conventional process safety wisdom assumes that check valves are not reliable safeguards. Experience indicates that check valves are prone to failure and that they may fail undetected. Therefore, the conservative assumption is that check valves may be listed in process hazard analyses as safeguards, but they are rarely considered to meet the standards required of an independent protection layer (IPL). Independent protection layers must be effective, independent, and auditable. Although independence is readily achievable by check valves, confirming and routinely auditing effectiveness is rarely pursued. And maintenance practices for check valves are often insufficient. Little data is available from operating companies regarding failure and leakage rates for different check valve types in various service applications or at various stages of service life. This paper examines a testing protocol that was put in place in 2014 for the purpose of testing check valves in order to apply layer of protection analysis (LOPA) credit to these valves for reverse flow scenarios. In order to understand check valve performance expectations, leakage allowances for new check valves are reviewed. Industry guidance and standards regarding consideration of check valves as safeguards or IPLs are also discussed. The analysis of new valve standards and the assessment of process safety requirements are the basis for establishing the pass/fail thresholds for the tests. The goal of sharing this information is that the discussion will stimulate others to consider the opportunity and the need to set-up similar testing and to begin gathering and sharing a larger body of data on check valve performance in various applications. Accumulation of check valve performance data and sharing of that data should lead to better understanding of check valve performance by type, size, age, and service. Better performance may be achieved where maintenance is improved and where learnings are applied to selection and design. In instances where requirements are met and credit is due, check valves may be credited in PHA and LOPA1
机译：常规过程安全智慧假设止回阀不可靠的保障措施。经验表明止回阀易于失败，并且它们可能未被发现。因此，保守假设是止回阀可以在过程危险中列出作为保护的过程，但很少被认为是符合独立保护层所需的标准（IPL）。独立保护层必须有效，独立和可审计。虽然通过止回阀容易实现独立性，但很少追求确认和常规审计效果。检查阀的维护实践通常不足。在各种服务应用中的不同止回阀类型的失败和泄漏速率的经营公司可以从经营公司提供少量数据或在使用寿命的各个阶段。本文介绍了在2014年到达的测试协议，以测试止回阀，以便将保护分析层（LOPA）信用作为反向流程应用于这些阀门。为了理解止回阀性能预期，综述了新止回阀的泄漏余量。还讨论了作为保障措施或IPLS考虑止回阀的行业指导和标准。对新阀标准的分析和过程安全要求的评估是建立测试的通过/失败阈值的基础。分享这些信息的目标是，讨论将刺激他人考虑机会和需要设置类似测试的必要性，并开始收集和共享各种应用中止回阀性能的更大的数据。检查阀性能数据的累积和分享该数据应通过类型，尺寸，年龄和服务更好地了解止回阀性能。可以在改进维护的情况下实现更好的性能，并将学习应用于选择和设计。在满足要求和信用的情况下，止回阀可以在PHA和LoPa1中记入贷记

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