The quality of products manufactured or procured by organizations is an important aspect of their survival in the global market. The quality control processes put in place by organizations can be resource-intensive bu...The quality of products manufactured or procured by organizations is an important aspect of their survival in the global market. The quality control processes put in place by organizations can be resource-intensive but substantial savings can be realized by using acceptance sampling in conjunction with batch testing. This paper considers the batch testing model based on the quality control process where batches that test positive are re-tested. The results show that re-testing greatly improves the efficiency over one stage batch testing based on quality control. This is observed using Asymptotic Relative Efficiency (ARE), where for values of </span><i><span style="font-family:Verdana;">p</span></i><span style="font-family:Verdana;"> computed ARE > 1 implying that our estimator has a smaller variance than the one-stage batch testing. Also, it was found that the model is more efficient than the classical two-stage batch testing for relatively high values of proportion.展开更多
为避免类似江西九江“3·12”石化企业加氢装置高低压互窜爆炸着火事故的发生,提出了对某炼化企业部分临氢装置紧急切断功能隐患治理项目进行基础设计阶段的危险与可操作性分析(HAZOP,Hazard and Operability Analysis)及安全完整...为避免类似江西九江“3·12”石化企业加氢装置高低压互窜爆炸着火事故的发生,提出了对某炼化企业部分临氢装置紧急切断功能隐患治理项目进行基础设计阶段的危险与可操作性分析(HAZOP,Hazard and Operability Analysis)及安全完整性等级(SIL,Safety Integrity Level)分级应用。HAZOP分析采用基于参数优先选择法的工作流程;SIL分级采用保护层分析(LOPA,Layers of Protection Analysis)方法,遵循“尽可能合理降低”(ALARP,As Low As Reasonably Practical)原则。对某炼化企业焦化汽煤油加氢精制装置、加氢联合柴油加氢精制装置和乙苯装置进行了HAZOP&SIL分级,共识别出事故场景12项,提出了建议措施6条。结果表明,HAZOP&SIL分级能够帮助该炼化企业有效地开展窜压风险隐患治理工作,把握安全生产主动权,将存在的窜压风险控制在可接受水平或及时地消除,预防高低压互窜事故的发生,保证炼化企业本质安全。展开更多
文摘The quality of products manufactured or procured by organizations is an important aspect of their survival in the global market. The quality control processes put in place by organizations can be resource-intensive but substantial savings can be realized by using acceptance sampling in conjunction with batch testing. This paper considers the batch testing model based on the quality control process where batches that test positive are re-tested. The results show that re-testing greatly improves the efficiency over one stage batch testing based on quality control. This is observed using Asymptotic Relative Efficiency (ARE), where for values of </span><i><span style="font-family:Verdana;">p</span></i><span style="font-family:Verdana;"> computed ARE > 1 implying that our estimator has a smaller variance than the one-stage batch testing. Also, it was found that the model is more efficient than the classical two-stage batch testing for relatively high values of proportion.
文摘为避免类似江西九江“3·12”石化企业加氢装置高低压互窜爆炸着火事故的发生,提出了对某炼化企业部分临氢装置紧急切断功能隐患治理项目进行基础设计阶段的危险与可操作性分析(HAZOP,Hazard and Operability Analysis)及安全完整性等级(SIL,Safety Integrity Level)分级应用。HAZOP分析采用基于参数优先选择法的工作流程;SIL分级采用保护层分析(LOPA,Layers of Protection Analysis)方法,遵循“尽可能合理降低”(ALARP,As Low As Reasonably Practical)原则。对某炼化企业焦化汽煤油加氢精制装置、加氢联合柴油加氢精制装置和乙苯装置进行了HAZOP&SIL分级,共识别出事故场景12项,提出了建议措施6条。结果表明,HAZOP&SIL分级能够帮助该炼化企业有效地开展窜压风险隐患治理工作,把握安全生产主动权,将存在的窜压风险控制在可接受水平或及时地消除,预防高低压互窜事故的发生,保证炼化企业本质安全。
