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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
The Design Improvement of High Integrity Protection System
Author(s)
Jin Hyung Park
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DOI:10.17265/2159-5275/2015.08.008
Affiliation(s)
ABSTRACT
HIPS (High Integrity Protection System) is a really important system to protect the fractionation column from overpressure and to protect any atmospheric pollution from flare stack, scrubber and VCU (vapor combustion unit), etc. KOSHA (Korea Occupational Safety & Health Agency) made criteria about HIPS inspection in 2007 to enforce HIPS inspection. HIPS is the first system which KOSHA and KGS (Korea Gas Safety Corp.) officially required to attach SIL verification report in the Process Safety Report. KOSHA and KGS uniformly require SIL3 for HIPS and require to configure the safety instrumented function to meet SIL3 requirement. The flare system with SIL3 application should have the interlocks to shut off the heat source in case of high pressure from tower, the cooling system failure and the power failure. KOSHA and KGS admit that the flare load is 0 where SIL 3 is applied to the flare system. So it is beneficial to plant because the equipment investment cost can be saved if SIL3 is applied to the flare system. By this reason, so many plants in Korea applied SIL3 to the flare system, scrubber system and VCU, etc. For SIL3 application, the redundant shutdown valve with PST (partial stroke test) should be installed with 1 out of 2 voting and the positioner for PST function should have HART communication function. There were problems caused by HART communication devices, so the system design should be cautiously done considering the operation availability and safety at the same time.
KEYWORDS
HIPS, SIL, SIS, HFT
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