Category: PRA

Evaluation of flare header modification

As part of a client’s project to reroute the existing underground flare piping to a newly constructed, above ground header system and add relief valves to existing flare system, Vega Oil and Gas Consulting evaluated the relief devices and new header system.

• Performed back-pressure analyses for all PSVs discharging to flare based on re-configured piping
• Proposed changes to several PSV types based on total back-pressure analyses
• Re-evaluated the existing global relief scenarios and added relief valves as required
• Proposed necessary changes to prevent liquid pockets in flare headers
• Designed new Knock Out Drum

Evaluation of relief device and system sizing for a gas fractionation plant

As part of a plant debottlenecking effort, Vega Oil and Gas Consulting evaluated the existing relief device, Knock Out Drum (KOD) and flare sizes relative to the higher plant throughput rate.

• Reviewed existing relief valve analyses and flare header analysis
• Re-evaluated rate dependent overpressure scenarios at higher throughput rate including inlet and outlet pressure drop analyses
• Determined “pinch” reboiler duties associated with various column to estimate realistic relief rates
• Re-evaluated KOD and flare radiation
• Proposed mitigation options to resolve deficiencies to meet higher throughput rate

Performed relief device and system sizing requirements for a new cryogenic gas processing plant

Vega Oil and Gas Consulting worked with the Engineering Procurement Company to perform the engineering analyses and assist in developing specifications for relief devices and the system.

• Identified overpressure scenario analysis
• Quantified required relief rate for each applicable overpressure scenarios
• Developed global overpressure scenario analysis
• Proposed inlet and outlet piping limitations to meet API 520/521 criteria.
• Prepared PSV datasheets for procurement.
• Analyzed flare header design (sub-headers and header size / length)
• Performed knockout drum (KOD) sizing analysis
• Performed flare radiation analysis to determine placement of flare at the site.

Performed relief device and vent header analysis for specialty chemical

Vega Oil and Gas Consulting performed pressure relief devices, specifically, rupture disks and vent header system analysis.

• Identified overpressure scenario analysis
• Quantified required relief rate for each applicable overpressure scenarios
• Performed total back pressure analysis to meet API 520/521 criteria
• Developed global overpressure scenario analysis
• Analyzed vent header design (sub-headers and header size / length)
• Provided mitigation options to meet API 520/521 standard and/or RAGAGEP

Performed relief device and vent header analysis for pharmaceutical plant

Vega Oil and Gas Consulting performed pressure relief devices, specifically, rupture disks and vent header system analysis.

• Identified overpressure scenario analysis
• Quantified required relief rate for each applicable overpressure scenarios
• Performed total back pressure analysis to meet API 520/521 criteria
• Developed global overpressure scenario analysis
• Analyzed vent header design (sub-headers and header size / length)
• Provided mitigation options to meet API 520/521 standard and/or RAGAGEP