Pressure Relief & Process Design

Manage Risk & Reduce Costs

E²G|The Equity Engineering Group, Inc. is a leader in developing technologies that manage risk, and Pressure Relieving Systems are a keystone in achieving process safety. Effective Pressure Relieving Systems help clients meet their risk management targets, compliance requirements, and business objectives.

Our engineers have been involved with the American Petroleum Institute’s (API) Pressure Relief Subcommittee for more than 25 years. Many are internationally recognized experts in the area of pressure relief system design and installation. E²G’s Philip Henry, P.E., has served as the task force chairman for the development of API RP 520, Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries for the past 23 years. Mr. Henry and other E²G engineers teach the official API Pressure Relieving Systems course, covering API RP 520, 521 and STD 2000.

E²G’s Pressure Relieving Engineers Assist Clients With the Following:

• Assessing existing relief systems for overpressure protection and recommending options for compliance, if necessary
• Analyzing RV (relief valve) performance concerns and recommending remediation methods to correct functionality
• Auditing Pressure Relieving Systems to provide assurance that the methodology and engineering analysis used in the design is in compliance with RAGAGEP (Recognized and Generally Accepted Good Engineering Practice)
• Evaluating existing or new relieving systems to provide adequate and economical overpressure protection
• Performing RBI (Risk-Based Inspection) analysis for relief devices

In Addition to These Services, We Perform the Following Types of Reviews:

• Assessments of a heat exchanger internal failure relating to the credibility of considering a full tube rupture as an overpressure scenario. We have the capability to perform tube vibration analyses and transient pressure surge analyses as part of a tube rupture scenario evaluation
• Application of paragraph UG-140 (formerly Code Case 2211) of ASME Section VIII, Division 1. This permits, under certain circumstances, the use of system design and/or instrumentation safeguards for overpressure protection in lieu of a PRD
• Assessment of required conditions for the use of isolation valves in the pressure relief path
• Dispersion analysis of atmospheric discharges
• Flare system design reviews involving overpressure scenario assessments and possible simultaneous discharges of multiple relief devices; we can also assess the credibility of any flare load reduction credits (e.g., dynamic modeling, HIPS, favorable instrument response)
• Flare radiation calculations
• Acoustically induced vibration (AIV) analysis
• 2-phase relief system evaluation and sizing

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