The Use of LOPA Method to Demonstrate Correct Installation of PSVs
CCPS Latin American Conference on Process Safety
2018
8th CCPS Latin American Conference on Process Safety
General Program
Management of Change
Tuesday, September 11, 2018 - 1:00am to 1:30am
When API 520 was a recommended practice (RP) and LOPA was not already established; some plant designs considered the installation of PSVs in the âmost convenient locationâ instead of the âmost useful locationâ. Most convenient location considered that some flow restrictions to PSVs are very unlikely to happen so it will not impact the reliability of the safeguards. Examples like: PSV to protect a fractionation column installed 1) downstream of overhead exchanger, 2) downstream of a non-CSO valve, etc are common in old plants.
However, when there are potential barriers between the PSV and the source of energy, the Probability of Failure on Demand (PFD) increases by the addition of the PFD of the barriers. Real world examples indicate how serious this problem can become âand the solution - if the PSV cannot protect the vessel/equipment because there is a form of isolation between the PSV and the source of pressure.
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