Will It Really Make that Much of a Difference?
Broad Effects of Operational Changes on Relief System Design
Ms. Marie Baker
Cognascents Consulting Group, Inc.
908 Town & Country Blvd., Suite 500
Houston, TX 77024
Mr. Teddy Bucher
Cognascents Consulting Group, Inc.
908 Town & Country Blvd., Suite 500
Houston, TX 77024
Keywords: Evergreen, flare system analysis, Hazard and Operability study (HAZOP), Independent Protection Layer (IPL), Management of Change (MOC), overpressure analysis, pressure relief analysis and design, Process Hazard Analysis (PHA), process modes of operation, Process Safety Information (PSI), relief device design basis, relief rate calculation and sizing, safeguard.
Abstract
Throughout the life of an operating facility, changes to the process are inevitable and potentially affect the systems that keep personnel and equipment safe. The Management of Change (MOC) process is intended to evaluate proposed changes prior to implementation to assess and address any risks that might be introduced as a result of this change. The MOC process typically includes a process hazards analysis (e.g. Hazard and Operability study, Layer of Protection Analysis), which evaluates safeguards and independent protection layers (IPLs) for the proposed changes.
Of the many IPLs, pressure relief devices are often overlooked and a re-evaluation of the design basis is sometimes not performed. The authors have observed that personnel do not always recognize the operational change might have an effect on the relief system.
In this paper, the authors explore what types of changes should trigger a relief system design review, exploring why what seem like minor modifications can have much larger ramifications. They also provide specific examples of the most common changes that demonstrate how the relief system design can be affected.
The target audience for this paper is anyone whose responsibilities include (1) pressure relief analysis, (2) process safety management (3) management of an operating facility (4) process engineering (5) process safety information management
Presenter(s)
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