My company is having a SIL course in office for 2 days, which is conducted by one of our colleague. SIL is an acronym for Safety Integrity Level. It is normally to perform following by HAZOP study. Basically, the SIL is categories into 4 levels which is from SIL 1 to SIL 4., the later one gives the more safety reliable. In oil and gas industry, the SIL is only up to SIL 3. THE SIL 4 is mainly for air plane industry.
A lot of new key terms I was learnt today in order to proceed the second day course of risk approaches ( I guest because I forgot the name). There are SIS, SIF, IPL, PFD, Inherent safety, etc. The SIF is a single function whereas SIS is multifuction, For instance in oil and gas plant, existance of PSDs(Process Shut Down) and ESDs (Emergency Shut Down) are to ensure the process always operates within safety criteria to elimate any Hazard or loss occur. SIF is considers as a ESD or PSD, while the SIS is a combination of ESDs and PSDs.
IPL is an Independent Protection layer. Before we proceed to IPL, we need to clear about inherent safety. Inherent safety is a risk can be reduced by optimization, substitution, technology, reduction, and etc( i forgot) rather than the application of engineering and process control to eradicate the Hazard. In reality, inherent safety is never exists and we need many protetion layers such as alarm, instrumentation control, evacuate procedure etc (i forgot). IPL is an independent protection layer that fully independent and not rely on other protection layers. For instance, the basic process control equiped with trip setting is only considers 1 IPL rather than 2 (basic control + trip alarm) because these two are rely on each other.
The SIL course also mentioned the risk matrix. The risk is equals to consequency x frequency. The HAZOP study needs to perform to determine the consequency and causes before proceeds to SIL to calculate the risk. Risk matrix is an indication of risk [ Green =safe, yellow = moderate risk, and red = dangerous risk]. In general, there are 3 risks, which are process risk, targeted risk(i forgot) and residual risk. The process risk is the process with only basic control. After implementing trip settings/controls, the risk becomes targeted risk. Targeted risk is the minimum requirement of safety to eliminate any hazard. The residual risk is an actual safety we implemented in actual process. The SI to perform if there is a gap between targered risk and process risk.
Above explanation is based on my memory and understanding because I forgot to bring course's material home. If you want to further understand the SIL, I advise you search online or from book. 我又一次语无论次，哈哈哈。。。。。。
A lot of new key terms I was learnt today in order to proceed the second day course of risk approaches ( I guest because I forgot the name). There are SIS, SIF, IPL, PFD, Inherent safety, etc. The SIF is a single function whereas SIS is multifuction, For instance in oil and gas plant, existance of PSDs(Process Shut Down) and ESDs (Emergency Shut Down) are to ensure the process always operates within safety criteria to elimate any Hazard or loss occur. SIF is considers as a ESD or PSD, while the SIS is a combination of ESDs and PSDs.
IPL is an Independent Protection layer. Before we proceed to IPL, we need to clear about inherent safety. Inherent safety is a risk can be reduced by optimization, substitution, technology, reduction, and etc( i forgot) rather than the application of engineering and process control to eradicate the Hazard. In reality, inherent safety is never exists and we need many protetion layers such as alarm, instrumentation control, evacuate procedure etc (i forgot). IPL is an independent protection layer that fully independent and not rely on other protection layers. For instance, the basic process control equiped with trip setting is only considers 1 IPL rather than 2 (basic control + trip alarm) because these two are rely on each other.
The SIL course also mentioned the risk matrix. The risk is equals to consequency x frequency. The HAZOP study needs to perform to determine the consequency and causes before proceeds to SIL to calculate the risk. Risk matrix is an indication of risk [ Green =safe, yellow = moderate risk, and red = dangerous risk]. In general, there are 3 risks, which are process risk, targeted risk(i forgot) and residual risk. The process risk is the process with only basic control. After implementing trip settings/controls, the risk becomes targeted risk. Targeted risk is the minimum requirement of safety to eliminate any hazard. The residual risk is an actual safety we implemented in actual process. The SI to perform if there is a gap between targered risk and process risk.
Above explanation is based on my memory and understanding because I forgot to bring course's material home. If you want to further understand the SIL, I advise you search online or from book. 我又一次语无论次，哈哈哈。。。。。。
1 comment:
Wah, it is nice of you publish this SIL in your blog! Anyway, nice to read! Next time i will get the softcopy from you when i go to KL office. But ...to me, all safety stuff is difficult to memorise as we usually do not frequently use them.Anyway, once you recognise them once, you have no problem to communicate with them later ...haha!
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