Crude Booster Pump Trip
Date: 09-June-2017 Time: 1050 hrs Sequence of Events: 1. Out of 4 running crude booster Pumps, 3 pumps tripped. Crude flow decreased from 1820 MT/hr to 650 MT/hr. 2. Another crude booster pump was immediately started and crude flow increased from 620 MT/hr to 1200 MT/hr with in 3-4 minutes. 3. Third and fourth crude pump could not be started immediately, hence flow was maintained @ 1200 MT/hr for about one hour. 4. After an hour third crude pump was started and flow was increased upto 1600 MT/hr. 5. Plant was stabilised at 1600 MT/hr by 1400 hrs and the further throughput increased to 1800 MT/hr by 1800 hrs. Action Taken in Panel: 1. Since flash drum level started to decrease, Pass flow to CDU furnace reduced gradually. Flash crude pump discharge was pinched. 2. This resulted in decreasing level of CDU column, hence pass flow to VDU furnace was also reduced gradually. 3. Reduction in pass flows, resulted in higher coil outlet temperatures of the CDU an...