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Process Hazard Analysis Report July 2020 <br /> The motivation for the change was to automate a manual process. The contractor <br /> installed dual pressure regulator, globe shut off valve, and an angle shut off valve <br /> on CH1 And CH2. Before this modification, personnel would close SVA-S 100, a <br /> 4" Danfoss manual valve. Be making this modification, the electronic valve SVA-S <br /> 80, a 3" Danfoss globe valve, will automatically close to prevent the chillers CH1 <br /> and CH2 from freezing up. <br /> MOC 0002 — Condenser CD line routing improvement (System 2) <br /> The motivation for the change was initiated by a mechanical integrity audit finding <br /> and PHA recommendation. The modification changed how the condenser drain <br /> (CD) lines exit the condenser and collect into a manifold pipe that terminates at the <br /> HPR inlet. Isolation valves were added to be able to pump down the condenser <br /> properly and isolate from the system. Purge valves were also added to be able to <br /> properly purge the system for non-condensibles. <br /> MOC 0003 — Relief piping routing improvement (System 2) <br /> The motivation for the change was initiated by a mechanical integrity audit finding <br /> and PHA recommendation. This modification was made to ensure compliance with <br /> ANSIMAR 2. The discharge piping for four (4) pressure relief valves were <br /> extended to be 7'-4" above the highest working platform; e.g. tanks 178-183. The <br /> extended piping is supported by the tank wall. <br /> MOC 0004 —Addition of charging station to HPR (System 2) <br /> The motivation for the change was initiated by a mechanical integrity audit finding <br /> and PHA recommendation. A charging station was added to the HPR. <br /> MOC 0005 —Addition of oil drain lines on chillers 3 & 4 (System 2) <br /> The motivation for the change was initiated by a mechanical integrity audit finding <br /> and PHA recommendation. The modification was a process improvement by <br /> providing an improved means for draining oil from the chillers. The previous <br /> configuration had the potential to trap oil in the piping. <br /> MOC 0006 — HSD line relief valve (System 2) <br /> The motivation for the change was initiated by a mechanical integrity audit finding <br /> and PHA recommendation. A relief valve from the high side discharge (HSD) line <br /> was removed per mechanical integrity audit. <br /> 13 <br />