安全儀表系統(tǒng)簡介ppt課件(編輯修改稿)
2025-02-14 08:18 本頁面
【文章內容簡介】 last functional test 自上次功能試驗以來經過時間 t 后 ,發(fā)現(xiàn)設備處在危險故障狀態(tài)的概率 . Pf (t) = (1 – el t ) time average 時間平均值 PFD Probability of Failure on demand PFD—指令故障概率 PFD depends on failure rate of equipment AND test interval. PFD取決于設備 AND試驗間隔的故障率 20220428 Commissioning test of Eamp。I SIS 12 Calculation of PFD PFD的計算 ? PFD calculation of an individual equipment easy, if you have – test interval – failure rate (given by supplier) – 如有試驗間隔和故障率 (供貨方提供 ), 則某個設備的 PFD計算就不難 ? PFDcalculation for more plex configurations (2oo3 etc. ) can be done using simple statistical models: Good for paring different configurations. 用簡單的統(tǒng)計模型可進行較復雜的配置 (2022等 )的 PFD計算 ? For SIS: PFD of field domain and control domain must be added. 對于 SIS: 必須加上磁場域和控制域的 PFD PFDSIS = PFDsensor + PFDPLC + PFDactuator 20220428 Commissioning test of Eamp。I SIS 13 Calculation of PFD – the problems… PFD的計算 —問題 … ? PFD data for field instruments usually not very reliable (not experimentally verified for chemical environment). 用于現(xiàn)場儀表的 PFD數(shù)據(jù)通常不是很可靠 (對于化學環(huán)境未經試驗驗證 ). ? Contribution to Failure Probability (PFD):對故障概率的影響因素 ? ? calculated values for PFD: often not very accurate. ? PFD計算值 : 經常不太準 Field Instruments 85 % 現(xiàn)場儀表 Logic Solver (failsafe PLC) 15 % 邏輯解答器 (故障保護 PLC) 20220428 Commissioning test of Eamp。I SIS 14 ―SIL‖ requirements for SIS SIS的“ SIL‖要求 Safety Integrity Level (SIL) 安全一體化水平 Probability of Failure on Demand (PFD) 指令故障概率 1 operating and monitoring functions 運行和檢測功能 2 SIS (“Class A functions”) SIS (―A級功能” ) 3 4 can not be realized by means of Eamp。I functions alone 不能僅靠電儀功能來實現(xiàn) For SIS: international and BASF standards request SIL 2 or SIL 3. 對于 SIS: 國際標準和巴斯夫標準要求 SIL2 或 SIL3. 20220428 Commissioning test of Eamp。I SIS 15 How to meet ―SIL‖ requirements 如何滿足“ SIL‖要求 1. Right Instruments: from BASF standard list (field proven) or certified
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