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AM-12-16 Risk-Based Approach to Evaluate Atmospheric Release from Pressure Relief Devices

Casey Houston ioMosaic Corporation Minneapolis, MN Charles Lea ioMosaic Corporation Minneapolis, MN

Format:
Electronic (digital download/no shipping)

Associate Member, International Member, Petrochemical Member, Refining Member - $0.00
Government, NonMember - $35.00

Description:

As a result of the March 23rd 2005 BP Texas City incident, API 521/ISO 23251 [ANSI/API Standard 521, “Petroleum and Natural Gas Industries Pressure-Relieving and Depressuring Systems,” 2007] published stronger guidance regarding atmospheric relief, particularly of flammable hydrocarbon liquids, and the use of high- integrity protective systems (HIPS). To ensure safe operation of processing areas and to meet updated industry recommended practices, an international petrochemical producer and ioMosaic Corporation (ioMosaic) evaluated all atmospheric relief devices using a risk-based approach. The study quantified the risk associated with potential atmospheric releases by quantifying the likelihood of overpressure scenarios, accounting for the frequency of the initiating event and the probability of failure on demand (PFD) of existing safeguards based on recognized corporate and industry guidelines, and the consequence of venting flammable and/or toxic materials based on rigorous dispersion estimates accounting for both buoyancy and momentum. The risk-based approach resulted in the most practicable and cost-effective solution by using a combination of routing the most hazardous relief devices to flare, augmenting HIPS to avoid atmospheric release, and maintaining the disposition of the lowest risk relief devices.

Product Details:

Product ID: AM-12-16
Publication Year: 2012