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Process Hazard Analysis Report <br />2020 <br />Figure 1 - Risk Ranking/Prioritization System <br />FREQUENCY <br />Frequency <br />Qualitative Frequency Criteria <br />Range <br />Potential for multiple life-threatening injuries or fatalities. <br />Level 4 <br />Events expected to occur yearly with respect to the refrigeration <br />Level 2 <br />system. Examples include single instrument or valve failures; hose <br />Level 1 <br />leaks; or a human error. <br />Level 3 <br />Events expected to occur several times during the lifetime of the <br />refrigeration system. Examples include dual instrument or valve <br />failures; hose ruptures; or piping leaks. <br />Level 2 <br />Events expected to occur no more than a few times during the lifetime <br />of the refrigeration system. Examples include combinations of <br />instrument failures and human errors, or full -bore failures of small <br />process lines or fittings. <br />Level 1 <br />Events not expected to occur during the lifetime of the refrigeration <br />system. Examples include multiple instrument or valve failures or <br />human errors, or spontaneous failures of tanks or process vessels. <br />CONSEQUENCE <br />Consequence <br />Range <br />Qualitative Safety Consequence Criteria ** <br />Level 4 <br />Potential for multiple life-threatening injuries or fatalities. <br />Level 3 ** <br />Potential for a single life-threatening injury or fatality or with <br />potential multiple minor injuries requiring a physician's care. <br />Level 2 <br />Potential for an injury requiring a physician's care. <br />Level 1 <br />Restricted to local vicinity, with potential injuries requiring no more <br />than first aid <br />